Accumulated amortization
Finite-Lived Intangible Assets, Accumulated Amortization
Distributions
Proceeds Received From Distributions of Managed Investment Entities Liabilities
Proceeds received from distributions of managed investment entities liabilities.
Investments
Investment, Policy [Policy Text Block]
Debt and Equity Securities, FV-NI [Line Items]
Debt and Equity Securities, FV-NI [Line Items]
Realized (gains) losses on investing activities
Realized Investment Gains (Losses)
Year 4, Cumulative
Short-duration Insurance Contracts, Historical Claims Duration, Year Four, Cumulative
Percentage on a cumulative basis of average payout, after reinsurance, in the fourth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.
Award Timing Predetermined
Award Timing Predetermined [Flag]
Number of interest rate swaps entered into during the period
Number Of Interest Rate Swaps Entered During The Period
Number Of Interest Rate Swaps Entered During The Period
Total net unrealized gains (losses) on securities, tax
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, Tax
Entity File Number
Entity File Number
Effect of income tax credits
Effective Income Tax Rate Reconciliation, Tax Credit, Amount
Reclassification adjustment for realized (gains) losses included in net earnings
Reclassification adjustment for realized (gains) losses included in net earnings, after tax
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax
Tabular List, Table
Tabular List [Table Text Block]
Other comprehensive income (loss), tax
Other Comprehensive Income (Loss), Tax
Additional Information
Additional Financial Information Disclosure [Text Block]
Level 3 assets that were priced using unobservable internal models and third party inputs
Level Three Assets That Were Priced Using Unobservable Internal Models and Third Party Inputs
Level three assets that were priced using unobservable internal models and third party inputs
Recently Adopted Accounting Standards
New Accounting Pronouncements, Policy [Policy Text Block]
Accident Year 2019
Short-Duration Insurance Contract, Accident Year 2019 [Member]
Fair value of financial instruments
Fair Value, by Balance Sheet Grouping [Table Text Block]
Share-based payment arrangement
Share-Based Payment Arrangement [Member]
Goodwill [Line Items]
Goodwill [Line Items]
Measurement Basis [Axis]
Measurement Basis [Axis]
Adjustment to Compensation:
Adjustment to Compensation [Axis]
Named Executive Officers, Footnote
Named Executive Officers, Footnote [Text Block]
Unearned premiums
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Unearned Premium
Statutory information
Statutory Accounting Practices Disclosure [Table Text Block]
Reclassification of Cash Flow Hedge Gain (Loss) [Abstract]
Reclassification of Cash Flow Hedge Gain (Loss) [Abstract]
Total current tax expense
Current Income Tax Expense (Benefit)
Adjustment to Compensation, Amount
Adjustment to Compensation Amount
Other assets
Increase (Decrease) in Other Operating Assets
Operating loss carryforward expiration dates [Axis]
Operating Loss Carry Forward Expiration Dates [Axis]
Operating loss carry forward Expiration Dates.
Audit Information [Abstract]
Auditor information
U.S. federal
Federal Income Tax Expense (Benefit), Continuing Operations
Employee Stock Option
Share-Based Payment Arrangement, Option [Member]
Securities
Realized gains (losses) on securities
Debt and Equity Securities, Realized Gain (Loss)
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Unrealized holding gains (losses) on cash flow hedges arising during the period, tax
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax
Dividends
Dividends
Dividends, Common Stock, Cash
Shareholders’ equity
Shareholders’ equity
Equity, Attributable to Parent
Debt Securities, Available-for-sale [Table]
Debt Securities, Available-for-Sale [Table]
Other comprehensive income, net of tax:
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Insider Trading Policies and Procedures [Line Items]
Accident Year 2017
Short-Duration Insurance Contracts, Accident Year 2017 [Member]
Common Stock, shares authorized
Common Stock, Shares Authorized
Liability for asbestos and environmental reserves
Liability for Asbestos and Environmental Claims, Gross
Financial assets:
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Liabilities and Equity:
Liabilities and Equity:
Liabilities and Equity [Abstract]
Agents’ balances and premiums receivable
Premiums Receivable, Net
Cover [Abstract]
Cover [Abstract]
Cash and cash equivalents
Cash and Cash Equivalents, Fair Value Disclosure
Portion at Fair Value Measurement
Portion at Fair Value Measurement [Member]
4.50% Subordinated Debentures due September 2060
Subordinated Debentures due in September 2060 [Member]
Subordinated Debentures due in September 2060
Maximum
Maximum [Member]
Finite-lived intangible assets useful life
Finite-Lived Intangible Asset, Useful Life
Amortizable intangible assets related to acquisitions
Finite-Lived Intangible Assets, Net
After ten years
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10
Restricted Stock
Restricted Stock [Member]
Non-PEO NEO Average Total Compensation Amount
Non-PEO NEO Average Total Compensation Amount
Debt Instrument [Line Items]
Debt Instrument [Line Items]
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table]
Summary of restricted stock awards
Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]
Management fees paid to AFG
Management Fees Paid by Variable Interest Entities
Management fees paid by variable interest entities.
Adjustment to Non-PEO NEO Compensation Footnote
Adjustment to Non-PEO NEO Compensation Footnote [Text Block]
Direct premiums earned
Direct Premiums Earned
Shares exchanged — benefit plans, shares
Stock Repurchased Shares Exchanged in Stock Compensation Plans, Shares
Repurchased shares exchanged in stock compensation plans, shares
Net unrealized gain (loss) on available for sale fixed maturities
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain (Loss), before Tax
Forgone Recovery due to Disqualification of Tax Benefits, Amount
Forgone Recovery due to Disqualification of Tax Benefits, Amount
Other assets
Other Assets [Member]
Non-Rule 10b5-1 Arrangement Terminated
Non-Rule 10b5-1 Arrangement Terminated [Flag]
Entity Shell Company
Entity Shell Company
Percentage of level 3 assets that were priced using financial information from third parties
Percentage Of Level Three Assets That Were Priced Using Financial Information From Third Parties
Percentage of level three assets that were priced using financial information from third parties
Schedule of Long-term Debt Instruments [Table]
Schedule of Long-Term Debt Instruments [Table]
After five years through ten years
Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value Percent
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value, Percent.
Insurance claims and reserves
Increase (Decrease) in Liability for Claims and Claims Adjustment Expense Reserve
Reinsurance and other receivables
Increase (Decrease) in Reinsurance and Other Receivables
Increase (Decrease) in reinsurance, agent's balances and premiums receivable and other receivables.
Income of managed investment entities:
Income (Loss) of Managed Investment Entities [Abstract]
Income (loss) of managed investment entities.
Loss Contingency Nature [Axis]
Loss Contingency Nature [Axis]
Statement of Stockholders' Equity [Abstract]
Statement of Stockholders' Equity [Abstract]
Operating segments
Operating Segments [Member]
Cash payments for income taxes
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
Unrealized holding gains (losses) on cash flow hedges arising during the period
Unrealized holding gains (losses) on cash flow hedges arising during the period, after tax
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax
Award Timing MNPI Considered
Award Timing MNPI Considered [Flag]
Contingent consideration — acquisitions
Contingent Consideration - Acquisitions [Member]
Contingent consideration of acquisitions.
U.S. only
Income (Loss) from Continuing Operations before Income Taxes, Domestic
Other receivables
Other Receivables
Purchases of investments
Purchases of Investments by Managed Investment Entities
The cash outflow from the purchase of investments by managed investment entities.
Realized gains (losses) on securities before impairments
Marketable Security, Realized Gain (Loss)
Document Fiscal Period Focus
Document Fiscal Period Focus
Derivatives, Fair Value [Line Items]
Derivatives, Fair Value [Line Items]
Award Timing Method
Award Timing Method [Text Block]
Award Type [Axis]
Award Type [Axis]
Accumulated foreign currency adjustment attributable to parent
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Hedging Relationship [Domain]
Hedging Relationship [Domain]
AFG
Parent Company [Member]
Premium Recognition
Insurance Premiums Revenue Recognition, Policy [Policy Text Block]
Investment, Name [Domain]
Investment, Name [Domain]
Stock-Based Compensation
Share-Based Payment Arrangement [Policy Text Block]
Trading Symbol
Trading Symbol
Lease payments due in 2029
Lessee, Operating Lease, Liability, to be Paid, Year Four
Total return swap
Total Return Swap [Member]
Effect of changes in valuation allowance as a percentage of EBT
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent
Proceeds from:
Proceeds from Investing Activity [Abstract]
Level 3 assets as a percentage of total assets measured at fair value
Level Three Asset As Percentage Of Asset Measured At Fair Value
Level Three Asset As Percentage Of Asset Measured At Fair Value.
Entity Address, City or Town
Entity Address, City or Town
Summary of Carrying value of long-term debt
Summary Of Carrying Value Of Long Term Debt [Abstract]
Summary of Carrying value of long-term debt.
New collateralized loan obligation entities
New Collateralized Loan Obligation Entities [Member]
New collateralized loan obligation entities.
Other unpaid losses and LAE, net of reinsurance
Short-Duration Insurance Contracts, Liability for Unpaid Claims and Claim Adjustment Expense, Other Reconciling Item
Total deferred tax assets
Deferred Tax Assets, Net of Valuation Allowance
Property and casualty insurance
Property and Casualty Insurance [Member]
Property and casualty insurance.
Non-PEO NEO Average Compensation Actually Paid Amount
Non-PEO NEO Average Compensation Actually Paid Amount
Income Statement Location [Domain]
Statement of Income Location, Balance [Domain]
Credit Losses on Financial Instruments
Credit Loss, Financial Instrument [Policy Text Block]
Compensation Actually Paid vs. Other Measure
Compensation Actually Paid vs. Other Measure [Text Block]
Business acquisition, consideration transferred
Business Combination, Consideration Transferred
Statutory Accounting Practices [Line Items]
Statutory Accounting Practices [Line Items]
Entity Emerging Growth Company
Entity Emerging Growth Company
Scheduled principal payments on debt in year three
Long-Term Debt, Maturity, Year Three
Year 3
Short-Duration Insurance Contracts, Historical Claims Duration, Year Three
Number of options outstanding
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number
Condensed Financial Information of Parent Company
Condensed Financial Information of Parent Company Only Disclosure [Text Block]
Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year
Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member]
Discount and Issue Costs
Debt Issuance Costs, Net
Common Stock, shares outstanding
Beginning balance, shares
Ending balance, shares
Common Stock, Shares, Outstanding
Insurance [Abstract]
Insurance [Abstract]
Equity securities reported at fair value
Marketable Securities [Table Text Block]
Current taxes:
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Internally developed Level 3 assets
Internally Developed Level 3 Assets
Level 3 assets in which the fair value was developed internally.
Percent of real estate-related investments by property type
Real-estate Related Investments, Percent, By Property Type
Percent of real-estate related investments by property type
Exercise of stock options
Stock Issued During Period, Value, Stock Options Exercised
Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year
Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member]
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Foreign currency translation and other
Liability for Unpaid Claims and Claims Adjustment Expense, Foreign Currency Translation Gain (Loss)
Claims Development [Line Items]
Claims Development [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Entity Address, Postal Zip Code
Entity Address, Postal Zip Code
Restatement Determination Date
Restatement Determination Date
Provision for income taxes
Total income tax provision
Income Tax Expense (Benefit)
Interest rate on revolving debt facility
Debt Instrument, Basis Spread on Variable Rate
Total net unrealized gains (losses) on cash flow hedges, tax
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax
Other assets
Other Assets
Commitments to fund credit facilities and limited partnerships
Unfunded Commitments to Credit Facilities and Limited Partnerships
Represents commitments to fund credit facilities and contribute capital to certain limited partnership investments at a future date.
Financial assets, beginning balance
Financial assets, ending balance
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value
5.625% Subordinated Debentures due June 2060
Subordinated Debentures Due In June 2060 [Member]
Subordinated Debentures Due In June 2060
Schedule of weighted-average remaining lease term and weighted-average discount rate
Schedule of Weighted-Average Remaining Lease Term and Weighted-Average Discount Rate [Table Text Block]
Tabular disclosure of the weighted-average remaining lease term and weighted-average discount rate
Pension Adjustments Service Cost
Pension Adjustments Service Cost [Member]
Designated as hedging instrument
Designated as Hedging Instrument [Member]
Subsegments [Axis]
Subsegments [Axis]
Fair Value Hierarchy and NAV [Axis]
Fair Value Hierarchy and NAV [Axis]
Hedging Relationship [Axis]
Hedging Relationship [Axis]
Total net unrealized gains (losses) on cash flow hedges
Total net unrealized gains (losses) on cash flow hedges
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax
Insurance claims and reserves transition liability
Deferred Tax Liabilities, Discounted Insurance Claims and Reserves Transition Adjustment
Amount of reasonable estimate of deferred tax liability related to the transition to revised interest rates and payout factors used in discounting loss reserves as modified by the TCJA.
Face value of liabilities issued by managed investment entities on issuance date
Face Value Of Liabilities Issued By Managed Investment Entities On Issuance Date
Face value of liabilities issued by managed investment entities.
Compensation Actually Paid vs. Company Selected Measure
Compensation Actually Paid vs. Company Selected Measure [Text Block]
Purchase of Radion
Goodwill, Acquired During Period
Cash received from the exercise of stock options
Proceeds from Stock Options Exercised
Acquisitions of Businesses
Mergers, Acquisitions and Dispositions Disclosures [Text Block]
U.S. federal
Income Tax Paid, Federal, after Refund Received
All Trading Arrangements
All Trading Arrangements [Member]
Equity Awards Adjustments, Footnote
Equity Awards Adjustments, Footnote [Text Block]
Total Shareholder Return Vs Peer Group
Total Shareholder Return Vs Peer Group [Text Block]
Percentage of investment of most subordinate debt tranche, minimum
Percentage of Investment of Most Subordinate Debt Tranche of Variable Interest Entity Minimum
Minimum percentage of investment of most subordinate debt tranche of variable interest entity.
Federal net operating loss carryforwards
Deferred Tax Assets, Operating Loss Carryforwards, Domestic
Effect of tax preference investments as a percentage of EBT
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent
5.25% Senior Notes due April 2030
Senior Notes Due In April 2030 [Member]
Senior Notes due in April 2030
Total, percent of fair value
Available For Sale Securities Debt Maturities Fair Value Percent
Available-for-sale Securities, Debt Maturities, Fair Value, Total, Percent.
Effect of other income tax reconciliation adjustments
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount
Deferred tax liabilities:
Deferred Tax Liabilities, Gross [Abstract]
Outstanding at January 1, 2025
Outstanding at December 31, 2025
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure [Abstract]
Payable to reinsurers
Reinsurance Payable
Foreign underwriting losses
Deferred Tax Assets, Operating Loss Carryforwards, Foreign
Net cash provided by operating activities
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance
Short-duration Insurance Contracts, Cumulative Percentage Paid of Incurred Claims and Allocated Claim Adjustment Expense, Net
The cumulative percentage paid of incurred claims and allocated LAE, net of reinsurance.
Interest and Amortization [Domain]
Interest and Amortization [Domain]
Interest and Amortization [Domain]
Forfeitures of restricted stock, shares
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited
Sales of fixed maturities
Proceeds from Sale of Debt Securities, Available-for-Sale
Sales and settlements
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales
Equity Valuation Assumption Difference, Footnote
Equity Valuation Assumption Difference, Footnote [Text Block]
PEO Total Compensation Amount
PEO Total Compensation Amount
Long-term Debt, Type [Axis]
Long-Term Debt, Type [Axis]
Level 3 assets that were priced using financial information from third parties
Level Three Assets That Were Priced Using Financial Information From Third Parties
Level three assets that were priced using financial information from third parties
Tangible assets acquired:
Business Combination, Recognized Asset Acquired, Asset [Abstract]
Statement, Equity Components [Axis]
Equity Components [Axis]
Equity Components [Axis]
After ten years
Available For Sale Securities Debt Maturities After Ten Years Fair Value Percent
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value, Percent.
Non-Rule 10b5-1 Arrangement Adopted
Non-Rule 10b5-1 Arrangement Adopted [Flag]
Reclassification adjustment for realized (gains) losses included in net earnings, tax
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax
Sales
Proceeds Received Related to Sales of Managed Investment Entities Liabilities
Proceeds received related to sales of managed investment entities liabilities during the period
Number of segments
Number of Reportable Segments
Losses and loss adjustment expenses
Policyholder Benefits and Claims Incurred, Net
Entity Address, State or Province
Entity Address, State or Province
Debt Securities, Available-for-sale, Allowance for Credit Loss [Table]
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Table]
Restricted stock awards, shares
Stock Issued During Period, Shares, Restricted Stock Award, Gross
Individual:
Individual [Axis]
Income Tax Authority [Domain]
Income tax authority [Domain]
Income Tax Jurisdiction [Domain]
Cash dividends paid on Common Stock
Payments of Ordinary Dividends, Common Stock
Document Annual Report
Document Annual Report
Entities [Table]
Entities [Table]
Real estate, property and equipment
Purchases of Real Estate, Property and Equipment
The cash outflow associated with the purchase of real estate held for investment purposes and cash flows associated with the acquisition of long-lived, physical assets that are used in the normal course of business.
Collateralized loan obligations and other asset backed securities
Collateralized loan obligations and other asset backed securities [Member]
Collateralized loan obligations and other asset backed securities
Insurance
Insurance Disclosure [Text Block]
Investment in CLO tranches
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount
Fixed maturities without a single maturity date
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Amortized Cost
Forgone Recovery, Explanation of Impracticability
Forgone Recovery, Explanation of Impracticability [Text Block]
Reductions of long-term debt
Repayments of Long-Term Debt
Entity Interactive Data Current
Entity Interactive Data Current
Dividends from subsidiaries
Equity in Distributed Pretax Earnings of Consolidated Subsidiaries
Portion of equity in pretax earnings of consolidated subsidiaries that was distributed from subsidiaries as a dividend.
Loss Contingency, Nature [Domain]
Loss Contingency, Nature [Domain]
Foreign currency translation adjustments, pretax
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]
Net investment income
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Net Investment Income
Investment in securities
Marketable Securities
Recoverables from reinsurers
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments
Claims, losses and settlement expenses
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Benefit, Claim, Loss and Settlement Expenses
Goodwill
Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]
Expiring 2041 - 2045
Expiration Date One [Member]
Expiration date one.
Unpaid losses and LAE — 11th year and prior (excluding unallocated LAE)
Short-Duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented
Disclosure of supplemental Balance Sheet information related to leases
Disclosure Of Supplemental Balance Sheet Information Related To Leases [Table Text Block]
Tabular disclosure of supplemental balance sheet information related to leases
Schedule of Condensed Financial Statements [Table]
Condensed Financial Statements [Table]
Entity Central Index Key
Entity Central Index Key
PEO Name
PEO Name
Total revenues
Revenues
Derivatives not designated as hedges, gains (losses) included in net earnings
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net
Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year
Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment income
Investment Income of Managed Investment Entities
Investment income of managed investment entities.
Outstanding Aggregate Erroneous Compensation Amount
Outstanding Aggregate Erroneous Compensation Amount
Total losses and LAE incurred
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims
U.S. state and local
State and Local Income Tax Expense (Benefit), Continuing Operations
Financial liabilities, beginning balance
Financial liabilities, ending balance
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value
Liabilities of managed investment entities
Variable Interest Entity, Liabilities
Variable Interest Entity, Liabilities
Schedule of Segment Reporting Information, by Segment [Table]
Schedule of Segment Reporting Information, by Segment [Table]
Net Earnings
Statutory Accounting Practices, Statutory Net Income Amount
Net written premiums
Premiums Written, Net
Beginning balance
Ending balance
Premium Receivable, Allowance for Credit Loss
Carrying value of cash and securities owned by U.S.-based insurance subsidiaries on deposit
Assets Held by Insurance Regulators
Derivatives included in the Balance Sheet at fair value
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
Exercise Price
Award Exercise Price
Entity Filer Category
Entity Filer Category
Dividends
Dividend Income, Operating
Class of Stock [Domain]
Class of Stock [Domain]
Common Stock, par value (USD per share)
Common Stock, No Par Value
Statutory rate of income taxes
Income taxes at statutory rate as a percentage of EBT
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent
Foreign
Foreign Income Tax Expense (Benefit), Continuing Operations
Income Tax Reconciliation [Line Items]
Income Tax Reconciliation [Line Items]
Income Tax Reconciliation.
Future amortization of intangibles in year three
Finite-Lived Intangible Asset, Expected Amortization, Year Three
Amortization of deferred policy acquisition costs
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Amortization of Deferred Policy Acquisition Cost
Deferred tax assets:
Deferred Tax Assets, Net [Abstract]
Reclassification from accumulated other comprehensive income
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax
Unfunded commitments to limited partnerships
Unfunded Commitments To Limited Partnerships
Represents commitments to contribute capital to certain limited partnership investments at a future date.
Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year
Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member]
Amortized cost
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss
Total costs and expenses
Benefits, Losses and Expenses
Gross written premiums
Premiums Written, Gross
Entity Address, Address Line One
Entity Address, Address Line One
Retirement and employee savings plan expense
Other Postretirement Benefits Cost (Reversal of Cost)
Accumulated Other Comprehensive Income (Loss)
AOCI attributable to parent
AOCI Attributable to Parent [Member]
Holding gains (losses) on equity securities still held
Holding Gains (Losses) on Equity Securities Still Held [Table Text Block]
Tabular disclosure of holding gains (losses) on equity securities still held.
Investments [Domain]
Investments [Domain]
Reinsurance recoverables on asbestos and environmental reserves, net of allowance
Less reinsurance recoverables, net of allowance
Add back reinsurance recoverables, net of allowance
Reinsurance recoverables, net of allowance
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments
Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]
Derivatives
Derivative Instruments and Hedging Activities Disclosure [Text Block]
Sales of other investments
Proceeds from Sale and Maturity of Other Investments
Maximum amount of dividends available to be paid by insurance subsidiaries to AFG without prior approval of regulatory authorities
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval
Consulting Company
Consulting Company [Member]
Consulting Company
Other liabilities — derivatives
Other Liabilities [Member]
Fair Value as of Grant Date
Award Grant Date Fair Value
Reclassification adjustment for investment income included in net earnings, tax
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax
Equity securities, at cost
Equity Securities, FV-NI, Cost
Gross realized gains and losses on the sale of available for sale fixed maturity security investments
Debt Securities, Available-for-Sale, Realized Gain (Loss) [Abstract]
Holding Gains (Losses) on Equity Securities Still Held [Line Items]
Holding Gains (Losses) on Equity Securities Still Held [Line Items]
holding gains (losses) on equity securities still held
Operating loss carryforwards
Operating Loss Carryforwards
Effect of changes in unrecognized income tax benefits
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount
Schedule of long-term debt instruments
Schedule of Long-Term Debt Instruments [Table Text Block]
Derivative Instruments and Hedging Activities Disclosures [Table]
Derivative Instruments and Hedging Activities Disclosures [Table]
Weighted average common shares adjustment related to stock-based compensation
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements
Short-duration Insurance Contracts, Claim Duration [Domain]
Short-Duration Insurance Contracts, Claim Duration [Domain]
Granted
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period
Forfeited
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period
Unrecognized compensation expense related to equity-based awards that have yet to vest
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount
Provision for expected credit losses
Reinsurance Recoverable, Credit Loss Expense (Reversal)
Fair value - less than twelve months
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months
Changed Peer Group, Footnote
Changed Peer Group, Footnote [Text Block]
Accident Year 2021
Short-Duration Insurance Contract, Accident Year 2021 [Member]
Lease payments due in 2027
Lessee, Operating Lease, Liability, to be Paid, Year Two
Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]
Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]
Condensed Financial Information Disclosure [Abstract]
Condensed Financial Information Disclosure [Abstract]
Adjustment To PEO Compensation, Footnote
Adjustment To PEO Compensation, Footnote [Text Block]
Investment Type [Axis]
Investment Type [Axis]
Title
Trading Arrangement, Individual Title
Peer Group Total Shareholder Return Amount
Peer Group Total Shareholder Return Amount
Interest and Amortization [Axis]
Interest and Amortization [Axis]
Interest and amortization
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Businesses
Payments to acquire subsidiaries
Cash paid at purchase
Payments to Acquire Businesses, Gross
Non-PEO NEO
Non-PEO NEO [Member]
Fixed maturities, available for sale, allowance for expected credit losses
Beginning balance
Ending balance
Debt Securities, Available-for-Sale, Allowance for Credit Loss
Goodwill, impairment loss, Statement of Income or Comprehensive Income [Extensible Enumeration]
Goodwill, Impairment Loss, Statement of Income or Comprehensive Income [Extensible Enumeration]
Short-duration insurance contracts, reconciliation of claims development to liability
Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Table Text Block]
Lease right of use assets
Deferred Tax Liabilities, Leasing Arrangements
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Gross unrealized gains on available for sale fixed maturities
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax
Award Type [Domain]
Award Type [Domain]
Unrealized holding gains (losses) on cash flow hedges arising during the period, pretax
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax
Lease payments due in 2026
Lessee, Operating Lease, Liability, to be Paid, Year One
Equity Awards Adjustments
Equity Awards Adjustments [Member]
Pension Benefits Adjustments, Footnote
Pension Benefits Adjustments, Footnote [Text Block]
Effect of cross-border tax laws as a percentage of EBT
Effective Income Tax Rate Reconciliation, Cross-Border Tax Effect, Percent
Other income
Other Income
Compensation Amount
Outstanding Recovery Compensation Amount
Deferred taxes:
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Subsegments [Domain]
Subsegments [Domain]
Debt Instrument, Name [Domain]
Debt Instrument, Name [Domain]
Reconciliation of beginning and ending liability for unpaid losses and loss adjustment expenses
Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block]
Recovery of Erroneously Awarded Compensation Disclosure [Line Items]
Fair Value
Estimate of Fair Value Measurement [Member]
Subsidiaries
Realized gains (losses) on subsidiaries
Realized Gains (Losses) on Subsidiaries
Realized gains (losses) on subsidiaries
Gains (losses) on change in fair value of assets/liabilities:
Gains (Losses) on Change in Fair Value of Assets/ Liabilities of Collateralized Loan Obligations [Abstract]
Gains losses on change in fair value of assets liabilities collateralized loan obligations.
Schedule of Investments [Line Items]
Schedule of Investments [Line Items]
MNPI Disclosure Timed for Compensation Value
MNPI Disclosure Timed for Compensation Value [Flag]
After one year through five years
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five
Effect of foreign tax effects as a percentage of EBT
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent
Net unrealized gains (losses) on securities:
Debt Securities, Unrealized Gain (Loss) [Abstract]
Deferred tax asset acquired
Business Combination, Recognized Asset Acquired, Deferred Tax Asset
Incurred Claims and Allocated LAE, Net of Reinsurance
Short-Duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net
Gain on change in fair value of contingent consideration liability
Business Combination, Contingent Consideration, Change in Contingent Consideration, Liability, Increase (Decrease)
Reclassification adjustment for realized (gains) losses included in net earnings, pretax
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax
Revenues:
Revenues [Abstract]
Variable Interest Entity, Primary Beneficiary, Does Not Hold Majority Voting Interest, Disclosures [Abstract]
Variable Interest Entity, Primary Beneficiary, Does Not Hold Majority Voting Interest, Disclosures [Abstract]
Number of active collateralized loan obligation entities
Number of Collateralized Loan Obligation Entities
Number of collateralized loan obligation entities.
After five years through ten years
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10
Accumulated other comprehensive income (loss), net of tax
Accumulated Other Comprehensive Income (Loss), Net of Tax
Condensed Financial Statements, Captions [Line Items]
Condensed Financial Statements, Captions [Line Items]
Scheduled principal payments on debt in next year
Long-Term Debt, Maturity, Year One
Liabilities
Gain (Loss) on Change in Fair Value of Liabilities of Variable Interest Entities
Gain (loss) on change in fair value of liabilities of variable interest entities.
Financial Instruments [Domain]
Financial Instruments [Domain]
Total net unrealized gains (losses) on securities
Total net unrealized gains (losses) on securities
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax
Total deferred tax liabilities
Deferred Tax Liabilities, Gross
Purchases and issuances
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases
Scheduled principal payments on debt in year five
Long-Term Debt, Maturity, Year Five
Aggregate Pension Adjustments Service Cost
Aggregate Pension Adjustments Service Cost [Member]
Total realized/unrealized gains (losses) included in other comprehensive income (loss)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)
Net tax expense related to pending IRS settlement regarding the sale of a subsidiary
Effect of other nondeductible items
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount
Net Investment Income [Line Items]
Net Investment Income [Line Items]
Reclassification adjustment for investment income included in net earnings
Reclassification adjustment for investment income included in net earnings from discontinued operations, after tax
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax
Finite-Lived Intangible Assets by Major Class [Axis]
Finite-Lived Intangible Assets by Major Class [Axis]
Minimum
Minimum [Member]
Managed Investment Entities
Variable Interest Entity, Primary Beneficiary, Does Not Hold Majority Voting Interest, Disclosures [Text Block]
The entire disclosure of consolidation and basis of presentation of variable interest entities, in which the registrant is deemed to be the primary beneficiary, even though it does not hold a majority voting interest.
Impact of discount on workers' compensation policies, prior year amount
Workers' Compensation Discount, Prior Year Amount
Shares exchanged — benefit plans
Stock Repurchased Shares Exchanged in Stock Compensation Plans, Value
Stock repurchased, shares exchanged in stock compensation plans, value.
Property and Casualty Group
Property And Casualty Group [Member]
Property and casualty group.
Company Selected Measure Name
Company Selected Measure Name
Liability for environmental and other claims
Accrual for Environmental Loss Contingencies
Insurance [Table]
insurance [Table]
insurance
Fair Value Measurement [Domain]
Fair Value Measurement [Domain]
Aggregate Available
Trading Arrangement, Securities Aggregate Available Amount
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Table]
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Table]
Cash paid for lease liabilities reported in operating cash flows
Operating Lease, Payments
Accident Year 2018
Short-Duration Insurance Contracts, Accident Year 2018 [Member]
Stock Appreciation Rights (SARs)
Stock Appreciation Rights (SARs) [Member]
Year 9, Cumulative
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine, Cumulative
Percentage on a cumulative basis of average payout, after reinsurance, in the ninth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.
Year 1
Year 1, Cumulative
Short-Duration Insurance Contracts, Historical Claims Duration, Year One
Other comprehensive income (loss), pretax
Other Comprehensive Income (Loss), before Tax
Stockholders' Equity Note [Abstract]
Stockholders' Equity Note [Abstract]
Foreign
Current Foreign Tax Expense (Benefit)
Contingencies
Commitments and Contingencies Disclosure [Text Block]
Diluted (shares)
Weighted Average Number of Shares Outstanding, Diluted
Segments of Operations
Segment Reporting, Policy [Policy Text Block]
Fixed maturities fair value, Subtotal, Percent
Available-for-sale Securities, Debt Maturities Excluding ABS and MBS, Fair Value, Percent
Available for sale securities debt maturities excluding ABS and MBS fair value percent.
Non-GAAP Measure Description
Non-GAAP Measure Description [Text Block]
Entity Small Business
Entity Small Business
Percent of subsidiary acquired
Business Combination, Voting Equity Interest Acquired, Percentage
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Abstract]
Other expenses
Other Cost and Expense, Operating
Other
Other Reserves [Member]
Other reserves, including discontinued operations.
U.S. state and local
Current State and Local Tax Expense (Benefit)
Long-Term Debt
Long-Term Debt [Text Block]
Document Transition Report
Document Transition Report
Selected financial information related to collateralized loan obligations
Financial Information Related to Collateralized Loan Obligations [Abstract]
Financial information related to collateralized loan obligations.
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]
After one year through five years
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five
Other assets
Business Combination, Recognized Asset Acquired, Other Asset, Noncurrent
Insurance Agency 2024
Insurance Agency 2024 [Member]
Insurance Agency 2024
Underlying Securities
Award Underlying Securities Amount
Balance at beginning of period of ownership of CLO tranches
Balance at end of period of ownership of CLO tranches
Variable Interest Entity, Primary Beneficiary, Maximum Loss Exposure, Amount
Gross gains
Debt Securities, Available-for-Sale, Realized Gain
Equity Component [Domain]
Equity Component [Domain]
Private equity funds
Equity Method Investments, Private Equity Funds [Member]
Equity Method Investments, Private Equity Funds
Document Period End Date
Document Period End Date
Change in Fair Value [Domain]
Change in Fair Value [Domain]
Change in Fair Value [Domain]
Income Taxes
Income Tax Disclosure [Text Block]
New interest rate swaps entered during the period
New Interest Rate Swaps Entered During Period [Member]
New interest rate swaps entered during the period
Mortgage loans and other investments
Mortgage Loans And Other Investments [Member]
Mortgage loans and other investments.
United Kingdom
UNITED KINGDOM
Awards Close in Time to MNPI Disclosures, Table
Awards Close in Time to MNPI Disclosures [Table Text Block]
Deferred Policy Acquisition Costs (''DPAC'')
Deferred Policy Acquisition Costs, Policy [Policy Text Block]
Schedule of Investments [Table]
Schedule of Investments [Table]
Verikai, Inc.
Verikai, Inc. [Member]
Verikai, Inc.
Beginning balance
Ending balance
Equity, Including Portion Attributable to Noncontrolling Interest
Mortgage loans
Mortgage Loans on Real Estate, Commercial and Consumer, Net
Document Type
Document Type
Level 3
Fair Value, Inputs, Level 3 [Member]
Name
Outstanding Recovery, Individual Name
Loss Contingencies [Table]
Loss Contingencies [Table]
Insurance Product Line [Axis]
Product and Service [Axis]
Reinsurance assumed
Assumed Premiums Earned
Schedule of Investment Income, Reported Amounts, by Category [Table]
Investment Income [Table]
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Statistical Measurement [Axis]
Statistical Measurement [Axis]
Total pretax
Pretax [Member]
Total Pretax.
Write-offs charged against the allowance
Reinsurance, Loss on Uncollectible Accounts in Period, Amount
Purchases of investments, property and equipment
Purchases of Investments, Property and Equipment
The cash outflow associated with the purchase of investments, property and equipment.
Aggregate Erroneous Compensation Amount
Aggregate Erroneous Compensation Amount
Disposal Group Name [Axis]
Disposal Group Name [Axis]
Total intrinsic value of options exercised
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value
Radion Insurance Holdings, LLC
Radion Insurance Holdings, LLC [Member]
Radion Insurance Holdings, LLC
Peer Group Issuers, Footnote
Peer Group Issuers, Footnote [Text Block]
Entity Information [Line Items]
Entity Information [Line Items]
Other comprehensive income
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Crop Insurance Contract, Crop Year 2022
Crop Insurance Contract, Crop Year 2022 [Member]
Crop Insurance Contract, Crop Year 2022
Summary of gain (loss) included in the Statement of Earnings for changes in the fair value of derivatives
Derivative Instruments, Gain (Loss) [Table Text Block]
Total financial assets not accounted for at fair value
Financial Assets Not Accounted For At Fair Value
Total financial assets not accounted for at fair value.
Amount borrowed under AFG revolving credit facility
Long-Term Line of Credit
Level 1
Fair Value, Inputs, Level 1 [Member]
Trading fixed maturities
Trading fixed maturities [Member]
Trading fixed maturities
Diluted (USD per share)
Earnings Per Share, Diluted
Deferred policy acquisition costs
Deferred Tax Liabilities, Deferred Expense, Deferred Policy Acquisition Cost
Multi-family
Multifamily [Member]
After five years through ten years
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10
Gross realized gains and losses on available for sale fixed maturity and equity security investments
Schedule of Realized Gain (Loss) [Table Text Block]
Accumulated Other Comprehensive Income [Roll Forward]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Dividends [Axis]
Dividends [Axis]
Reinsurance
Reinsurance Accounting Policy [Policy Text Block]
Dividend reinvestment plan
Stock Issued During Period, Value, Dividend Reinvestment Plan
U.S. state and local
Income Tax Paid, State and Local, after Refund Received
Number of CLOs substantially liquidated during the period
Number Of Collateralized Loan Obligation Entities Substantially Liquidated During The Period
Number of collateralized loan obligation entities substantially liquidated during the period
Level 3 assets that were priced using a discounted cash flow approach
Level Three Assets That Were Priced Using A Discounted Cash Flow Approach
Level three assets that were priced using a discounted cash flow approach.
Assets
Gain (Loss) on Change in Fair Value of Assets of Variable Interest Entities
Gain (loss) on change in fair value of assets of variable interest entities.
Consolidation Items [Domain]
Consolidation Items [Domain]
Derivative Liability, Statement of Financial Position [Extensible Enumeration]
Derivative Liability, Statement of Financial Position [Extensible Enumeration]
Investments, Debt and Equity Securities [Abstract]
Investments, Debt and Equity Securities [Abstract]
Auditor Location
Auditor Location
Property and casualty insurance underwriting
Property and casualty insurance underwriting
Property and Casualty Insurance Underwriting Income (Loss)
Underwriting income (loss) for the property and casualty insurance segment, which is calculated as premiums earned less losses and loss adjustment expenses less commissions and other underwriting expenses.
Provision for expected credit losses on securities with no previous allowance
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Not Previously Recorded
Short-duration insurance contracts, claims development
Short-Duration Insurance Contracts, Claims Development [Table Text Block]
Shares acquired and retired
Stock Repurchased and Retired During Period, Value
Accumulated Other Comprehensive Income, Net of Tax ("AOCI")
Comprehensive Income, Policy [Policy Text Block]
Less: future lease payments impact of discounting
Lessee, Operating Lease, Liability, Undiscounted Excess Amount
Sales of equity securities
Proceeds from Sale of Equity Securities, FV-NI
Total cash payments for income taxes, net of refunds
Income Taxes Paid, Net
Effect of other nondeductible items as a percentage of EBT
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent
Future amortization of intangibles in year two
Finite-Lived Intangible Asset, Expected Amortization, Year Two
Principal
Long-Term Debt, Gross
Entity Well-known Seasoned Issuer
Entity Well-known Seasoned Issuer
Total lease payments
Lessee, Operating Lease, Liability, to be Paid
Specialty casualty
Specialty Casualty Insurance [Member]
Specialty casualty.
Unrealized holding gains (losses) on securities arising during the period
Unrealized holding gains (losses) on securities arising during the period, after tax
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax
Difference between aggregate unpaid principal balance and carrying value of CLOs' debt
Difference Between Aggregate Unpaid Principal Balance And Carrying Value Of Variable Interest Entity Debt
Difference between aggregate unpaid principal balance and fair value of variable interest entity debt.
Accident Year 2024
Short-Duration Insurance Contract, Accident Year 2024 [Member]
Property and casualty companies
Property, Liability and Casualty Insurance Product Line [Member]
Pension and other postretirement plan adjustments, pretax
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax
Year 3, Cumulative
Short-duration Insurance Contracts, Historical Claims Duration, Year Three, Cumulative
Percentage on a cumulative basis of average payout, after reinsurance, in the third year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.
Earnings (losses) on derivatives
Gain (Loss) on Derivative Instruments, Net, Pretax
Dividends [Domain]
Dividends [Domain]
Gross unrealized losses on securities by investment category and length of time that have been in a continuous unrealized loss position
Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block]
Expiration Date
Trading Arrangement Expiration Date
Other liabilities
Increase (Decrease) in Other Operating Liabilities
Future amortization of intangibles in year five
Finite-Lived Intangible Asset, Expected Amortization, Year Five
Holding gains (losses) on equity securities
Equity Securities, FV-NI, Unrealized Gain (Loss)
Foreign government
Debt Security, Government, Non-US [Member]
Equity method investments
Equity Method Investments [Table Text Block]
Reinsurance ceded
Ceded Premiums Written
Contingent consideration possible to be paid, maximum
Business Combination, Contingent Consideration, Range of Outcomes, Maximum, Amount
Compensation Actually Paid vs. Net Income
Compensation Actually Paid vs. Net Income [Text Block]
Entity Current Reporting Status
Entity Current Reporting Status
Awards Close in Time to MNPI Disclosures
Awards Close in Time to MNPI Disclosures [Table]
Consolidated Entities [Domain]
Consolidated Entities [Domain]
One year or less
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One
Income taxes at statutory rate
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount
Financial Instrument [Axis]
Financial Instrument [Axis]
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Abstract]
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Abstract]
Costs and Expenses:
Benefits, Losses and Expenses [Abstract]
Consolidated Balance Sheet [Abstract]
Statement of Financial Position [Abstract]
Executive Category:
Executive Category [Axis]
Unrealized loss - twelve months or more
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss
5.875% Subordinated Debentures due March 2059
Subordinated Debentures Due In March 2059 [Member]
Subordinated Debentures Due In March 2059
Effect of state and local income taxes, net of federal income tax effect as a percentage of EBT
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent
Additional long-term borrowings
Proceeds from Issuance of Long-Term Debt
Interest charges on borrowed money
Interest charges on other borrowings
Interest Expense, Operating and Nonoperating
Current Fiscal Year End Date
Current Fiscal Year End Date
Technology-based intangible assets
Technology-Based Intangible Assets [Member]
Unrealized loss - less than twelve months
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss
Finite-Lived Intangible Assets, Major Class Name [Domain]
Finite-Lived Intangible Assets, Major Class Name [Domain]
Workers' Compensation Insurance
Workers' Compensation Insurance [Member]
Payable to reinsurers
Increase (Decrease) in Reinsurance Payables
Lease liabilities
Deferred Tax Assets, Lease Liabilities
Deferred tax assets, lease liabilities
Specialty financial
Specialty Financial Insurance [Member]
Specialty Financial.
Prior years
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Other liabilities — derivatives
Derivative liability
Derivative Liability
Equity Awards Adjustments, Excluding Value Reported in Compensation Table
Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member]
Other
Other Long-term Debt [Member]
Other Long-term Debt.
Investment and other income, net
Investment and Other Income, Net
Net investment income plus other income less other expenses.
Effect of changes in tax laws or rates enacted in the current period as a percentage of EBT
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent
Assets and liabilities measured at fair value
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Carrying value and fair value of financial instruments that are not carried at fair value
Financial Instruments Financial Assets And Liabilities Balance Sheet Groupings [Abstract]
Financial instruments financial assets and liabilities balance sheet groupings.
Equity securities, at fair value
Equity securities
Equity Securities, FV-NI, Current
Net tangible assets acquired, at fair value
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less)
Anti-dilutive potential common shares related to stock-based compensation plans
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Average number of Common Shares:
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Fair Value, by Balance Sheet Grouping [Table]
Fair Value, by Balance Sheet Grouping [Table]
Accident Year 2025
Short-Duration Insurance Contract, Accident Year 2025 [Member]
Scheduled principal payments on debt in year two
Long-Term Debt, Maturity, Year Two
Level 3 assets that were priced using non-binding broker quotes or pricing services
Level Three Assets That Were Priced Using Non Binding Broker Quotes or Pricing Services
Level three assets that were priced using non-binding broker quotes or pricing services.
Year 4
Short-Duration Insurance Contracts, Historical Claims Duration, Year Four
Additions to previously recognized expected credit losses
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Not to Sell before Recovery, Credit Loss, Previously Recorded, Expense (Reversal)
Leases
Lessee, Operating Leases [Text Block]
Net cash used in financing activities
Net cash used in financing activities
Cash Provided by (Used in) Financing Activity, Including Discontinued Operation
Indefinite expiration
Indefinite Expiration [Member]
Indefinite expiration
Measure:
Measure [Axis]
Future amortization of intangibles after year five
Finite-Lived Intangible Asset, Expected Amortization, after Year Five
Equity securities, fair value in excess of cost
Equity Securities, FV-NI, Fair Value in Excess of Cost
Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI) in excess of the cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value.
Net investment income
Investment Income [Member]
Number of businesses acquired during period
Business Combination, Number of Businesses Acquired
Capital and Surplus
Statutory Accounting Practices, Statutory Capital and Surplus, Balance
Pay vs Performance Disclosure, Table
Pay vs Performance [Table Text Block]
Forgone Recovery due to Violation of Home Country Law, Amount
Forgone Recovery due to Violation of Home Country Law, Amount
Common Stock and Capital Surplus
Common Stock Including Additional Paid in Capital [Member]
Investment expenses
Investment Income, Investment Expense
Entity Tax Identification Number
Entity Tax Identification Number
Effect of income tax credits as a percentage of EBT
Effective Income Tax Rate Reconciliation, Tax Credit, Percent
Fixed maturities without a single maturity date
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value
Selected financial information related to collateralized loan obligations
Schedule of Variable Interest Entities [Table Text Block]
Year 10
Short-Duration Insurance Contracts, Historical Claims Duration, Year 10
Common Stock, shares issued
Common Stock, Shares, Issued
Derivative Asset, Statement of Financial Position [Extensible Enumeration]
Derivative Asset, Statement of Financial Position [Extensible Enumeration]
Weighted-average remaining lease term
Operating Lease, Weighted Average Remaining Lease Term
Scheduled principal payments on debt in year four
Long-Term Debt, Maturity, Year Four
Goodwill and Other Intangibles
Goodwill and Intangible Assets Disclosure [Text Block]
Entity Public Float
Entity Public Float
Changes in the carrying value of goodwill
Schedule of Goodwill [Table Text Block]
Trading Arrangement:
Trading Arrangement [Axis]
Total Shareholder Return Amount
Total Shareholder Return Amount
Loss Contingencies [Line Items]
Loss Contingencies [Line Items]
Real Estate, Type of Property [Axis]
Real Estate, Type of Property [Axis]
Total realized/unrealized gains (losses) included in Net earnings
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings
Security Exchange Name
Security Exchange Name
After one year through five years
Available For Sale Securities Debt Maturities After One Through Five Years Fair Value Percent
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value, Percent.
Beginning balance
Ending balance
Reinsurance Recoverable, Allowance for Credit Loss
Year 6, Cumulative
Short-duration Insurance Contracts, Historical Claims Duration, Year Six, Cumulative
Percentage on a cumulative basis of average payout, after reinsurance, in the sixth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.
Foreign
Income Tax Paid, Foreign, after Refund Received
Mortgage-backed securities
Collateralized Mortgage-Backed Securities [Member]
Revolving credit line
Line of Credit Facility, Maximum Borrowing Capacity
Accident Year 2023
Short-Duration Insurance Contract, Accident Year 2023 [Member]
Dividend reinvestment plan, shares
Stock Issued During Period, Shares, Dividend Reinvestment Plan
Reinsurance ceded
Ceded Premiums Earned
Supplementary Insurance Information
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Disclosure [Text Block]
Accident Year 2022
Short-Duration Insurance Contract, Accident Year 2022 [Member]
Fair Value by Asset Class [Domain]
Asset Class [Domain]
Sales of investments, property and equipment
Proceeds from Sales of Investments, Property and Equipment
The cash inflow associated with the sale of investments, property and equipment.
Total realized/unrealized gains (losses) included in Net earnings
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings
Managed investment entities’ assets/liabilities
Change in Managed Investment Entities Assets And Liabilities
The increase (decrease) during the reporting period in other operating assets and liabilities of managed investment entities.
Statement [Line Items]
Statement [Line Items]
Rule 10b5-1 Arrangement Adopted
Rule 10b5-1 Arrangement Adopted [Flag]
Cash and cash equivalents
Cash and cash equivalents
Cash and cash equivalents at beginning of year
Cash and cash equivalents at end of year
Cash and Cash Equivalent
Common stocks
Common Shares
Common Stock [Member]
Vested
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period
Purchases and issuances
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances
Fixed maturities with embedded derivatives
Fixed Maturity Securities with Embedded Derivatives [Member]
Fixed maturity securities with embedded derivatives.
Net Change in Cash and Cash Equivalents
Cash and cash equivalents, period increase (decrease)
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation
Average life of Residential MBS
Mortgage Backed Securities Average Life
Mortgage backed securities average life.
Real estate-related investments
Equity Method Investments, Real Estate-related Investments [Member]
Equity Method Investments, Real Estate-related Investments
Accounting Policies
Significant Accounting Policies [Text Block]
Subsidiary 2
Subsidiary 2 [Member]
Subsidiary 2
Statistical Measurement [Domain]
Statistical Measurement [Domain]
Accident Year 2016
Short-Duration Insurance Contracts, Accident Year 2016 [Member]
Business Combination [Abstract]
Business Combination [Abstract]
Lease payments due thereafter
Lessee, Operating Lease, Liability, to be Paid, after Year Five
Net decrease in the provision for claims of prior years
Prior Year Claims and Claims Adjustment Expense
Assets of managed investment entities
Variable Interest Entity, Assets
Variable Interest Entity, Assets
Real Estate [Domain]
Real Estate [Domain]
Asset Class [Axis]
Asset Class [Axis]
Asset Class [Axis]
Goodwill deductible for tax purposes
Business Combination, Goodwill, Expected Tax Deductible, Amount
Interest rate swaps
Interest Rate Swap [Member]
Debt Issuance Costs
Debt, Policy [Policy Text Block]
Total realized/unrealized gains (losses) included in other comprehensive income (loss)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)
Equity in earnings of partnerships and similar investments
Income (Loss) from Equity Method Investments
Leases [Abstract]
Leases [Abstract]
Unearned premiums
Unearned Premiums
Total financial liabilities not accounted for at fair value
Financial Liabilities Not Accounted For At Fair Value
Total financial liabilities not accounted for at fair value.
Impairment allowance on securities
Investments, Allowance for Credit Loss, Period Increase (Decrease)
Increase (decrease) during the period in the allowance for credit losses on investments
Gross unrealized losses on available for sale fixed maturities
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax
Liability for Unpaid Claims and Claims Adjustment Expense, Activity in Liability [Abstract]
Liability for Unpaid Claims and Claims Adjustment Expense, Activity in Liability [Abstract]
Trading Arrangements, by Individual
Trading Arrangements, by Individual [Table]
Total IBNR Plus Expected Development on Reported Claims
Short-Duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net
Basic (USD per share)
Earnings Per Share, Basic
Returns of capital from subsidiaries
Returns Of Capital From Subsidiaries
The cash inflow associated with amounts received from the subsidiaries during the period.
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Liabilities:
Liabilities, Fair Value Disclosure [Abstract]
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward]
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward]
Effect of changes in unrecognized income tax benefits as a percentage of EBT
Effective Income Tax Rate Reconciliation, Tax Contingency, Percent
Total deferred tax assets before valuation allowance
Deferred Tax Assets, Gross
Tax benefit related to exercise of stock options
Share-Based Payment Arrangement, Exercise of Option, Tax Benefit
Other comprehensive income, net of tax
Other comprehensive income (loss)
Other Comprehensive Income (Loss), Net of Tax
Segment Reporting Information, by Segment
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Receivable for collateral posted related to swaps
Derivative Liability, Not Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash
Receivable for collateral posted related to interest rate swap liabilities
Reductions due to sales or redemptions
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Securities Sold
Property and transportation
Specialty Property And Transportation Insurance [Member]
Specialty Property and transportation.
Realized gains (losses) on securities
Realized gains (losses) on securities
Realized Gains (Losses) On Securities [Member]
Primary financial statement caption encompassing realized gains (losses) on securities.
Available for sale fixed maturities and equity securities
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block]
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments
Realized Gains Losses And Changes In Unrealized Appreciation Depreciation Related To Fixed Maturity And Equity Security Investments [Abstract]
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments.
Private debt funds
Equity Method Investments, Private Debt Funds [Member]
Equity Method Investments, Private Debt Funds
Operating loss carryforward expiration dates [Domain]
Operating Loss Carry Forward Expiration Dates [Domain]
Operating loss carry forward Expiration Dates.
Agents’ balances and premiums receivable
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Agents’ Balances and Premiums Receivable
Amount due from agents' and amount of premiums due acquired at the acquisition date
Award Timing MNPI Disclosure
Award Timing MNPI Disclosure [Text Block]
Investment and other income
Investment and Other Income
Investment and other income.
Cash and cash equivalents
Cash and Cash Equivalents [Member]
Revenues before realized gains (losses)
Revenues before Realized Gains (Losses)
Aggregate revenue (including insurance premiums, investment income and other income) recognized during the period before realized gains (losses) on securities and subsidiaries.
Foreign currency translation adjustments, tax
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax
Variable interest entity, primary beneficiary
Variable Interest Entity, Primary Beneficiary [Member]
Realized gains (losses) on:
Realized Gains (Losses) on [Abstract]
Realized gains (losses) on.
Total compensation expense related to stock incentive plans
Share-Based Payment Arrangement, Expense
Roll forward of allowance for credit losses on fixed maturity securities
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Table Text Block]
Accident year 2020
Short-Duration Insurance Contract, Accident Year 2020 [Member]
Hedging Designation [Domain]
Hedging Designation [Domain]
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets Disclosure [Abstract]
Other benefit plans, shares
Stock Issued During Period, Shares, Employee Benefit Plan
Equity Securities, FV-NI, Unrealized Gain (Loss) [Abstract]
Total liabilities and shareholders’ equity
Liabilities and Equity
Accumulated defined benefit plans adjustment attributable to parent
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Other, net
Deferred Tax Assets, Other
Accounting Policies [Abstract]
Accounting Policies [Abstract]
Gain (loss) on change in fair value of assets/liabilities
Gain (Loss) on Change in Fair Value of Assets and Liabilities of Managed Investment Entities
Loss on change in fair value of assets and liabilities of managed investment entities.
Undiscounted contractual maturities of operating lease liabilities
Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block]
Insurance [Line Items]
Insurance [Line Items]
Insurance
Other investments
Payments to Acquire Other Investments
Impairment allowance on fixed maturity securities
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Period Increase (Decrease)
Restricted Common Stock vested during period, fair value
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value
Pay vs Performance Disclosure [Line Items]
Operating lease liability
Operating Lease, Liability
Face amount of managed investment entities liabilities purchased by subsidiaries at issuance date
Face Amount Of Managed Investment Entities Liabilities Purchased At Issuance Date
Face amount of managed investment entities liabilities purchased at issuance date.
Other lines
Other Lines [Member]
Other lines.
Deferred policy acquisition costs
Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Net
Insurance [Axis]
Insurance [Axis]
Insurance.
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]
Short-Duration Insurance Contracts, Historical Claims Duration [Line Items]
Goodwill, impairment loss
Goodwill, impairment loss
Goodwill, Impairment Loss
Capital contributions to subsidiaries
Capital Contributions to Subsidiaries
The cash outflow associated with amounts contributed to subsidiaries during the period.
Schedule of Variable Interest Entities [Table]
Variable Interest Entity [Table]
Year 8
Short-Duration Insurance Contracts, Historical Claims Duration, Year Eight
Consolidated Statement of Cash Flows [Abstract]
Statement of Cash Flows [Abstract]
Company Selected Measure Amount
Company Selected Measure Amount
Lease payments due in 2028
Lessee, Operating Lease, Liability, to be Paid, Year Three
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]
Comprehensive income
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Disposal Group Name [Domain]
Disposal Group Name [Domain]
Name
Measure Name
Summary of earnings before income taxes subject to foreign tax jurisdictions
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]
One year or less
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One
Changes in liability balances of Level 3 financial liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
Maturities and redemptions of fixed maturities
Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale
Fair value as percentage of cost - less than twelve months
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less Than Twelve Months, Fair Value As Percentage Of Cost
Available for sale securities continuous unrealized loss position less than twelve months fair value as percentage of cost.
Reinsurance assumed
Assumed Premiums Written
Year 8, Cumulative
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight, Cumulative
Percentage on a cumulative basis of average payout, after reinsurance, in the eighth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.
The scheduled maturities of available for sale fixed maturities
Available-for-Sale Securities, Debt Maturities [Abstract]
Long-term debt
Carrying Value
Long-Term Debt
Aggregate unpaid principal balance of CLO loans in default
Aggregate unpaid principal balance of variable interest entity loans in default
Aggregate unpaid principal balance of variable interest entity loans in default
Total assets
Total assets
Assets
Future amortization of intangibles in next year
Finite-Lived Intangible Asset, Expected Amortization, Year One
Average grant date fair value, vested
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value
Difference between aggregate unpaid principal balance and fair value of CLOs' fixed maturity investments
Difference Between Aggregate Unpaid Principal Balance And Fair Value Of Variable Interest Entity Investments
Difference between aggregate unpaid principal balance and fair value of variable interest entity investments.
Income Taxes
Income Tax, Policy [Policy Text Block]
Short-duration insurance contracts, schedule of historical claims duration
Short-Duration Insurance Contracts, Schedule of Historical Claims Duration [Table Text Block]
Components of deferred tax assets and liabilities
Components of Deferred Tax Assets and Liabilities [Abstract]
Operating Activities:
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract]
Weighted average useful life of finite-lived intangible assets acquired
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life
Short-duration Insurance Contracts, Claims Development [Table]
Short-Duration Insurance Contracts, Claims Development [Table]
Unallocated LAE
Short-Duration Insurance Contracts, Liability for Unpaid Claims and Claims Adjustment Expense, Accumulated Unallocated Claim Adjustment Expense
Assets:
Assets, Fair Value Disclosure [Abstract]
Future amortization of intangibles in year four
Finite-Lived Intangible Asset, Expected Amortization, Year Four
Significant Accounting Policies [Line Items]
Variable Interest Entity [Line Items]
Variable Interest Entity [Line Items]
Managed Investment Entities
Consolidation, Variable Interest Entity, Policy [Policy Text Block]
Cash dividends per Common Share (USD per share)
Common Stock, Dividends, Per Share, Declared
Real estate and other investments
Real estate and other investments
Other Investments
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Specialty unpaid losses and LAE, net of reinsurance
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE)
Short-Duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net
Right-of-use assets obtained under new leases
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-Sale [Line Items]
Total tangible assets acquired
Business Combination, Recognized Asset Acquired, Asset
Prepaid reinsurance premiums
Prepaid Reinsurance Premiums
Level 2
Fair Value, Inputs, Level 2 [Member]
Document Financial Statement Error Correction [Flag]
Document Financial Statement Error Correction [Flag]
Net tax expense related to a pending state income tax examination regarding sale of subsidiary
Effect of state and local income taxes, net of federal income tax effect
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount
Investments accounted for using the equity method
Equity Method Investments
Insider Trading Policies and Procedures Not Adopted
Insider Trading Policies and Procedures Not Adopted [Text Block]
Business Combination [Domain]
Business Combination [Domain]
Components of income tax provision (credit)
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
PEO
PEO [Member]
Transfer into Level 3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3
Proceeds from maturities and redemptions of investments
Proceeds from Sale, Maturity and Collection of Investments
Available for sale fixed maturity securities by contractual maturity date
Investments Classified by Contractual Maturity Date [Table Text Block]
Fixed maturities, trading at fair value
Trading fixed maturities
Debt Securities, Trading
Year 6
Short-Duration Insurance Contracts, Historical Claims Duration, Year Six
U.S.
UNITED STATES
Other
Corporate Segment and Other Operating Segment [Member]
Change in:
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract]
Effect of changes in valuation allowance
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount
Retained Earnings
Retained Earnings [Member]
Total payments
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid
Income Tax Authority [Axis]
Income tax authority [Axis]
Income Tax Jurisdiction [Axis]
Cash and cash equivalents at beginning of year
Cash and cash equivalents at end of year
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation
Consolidated Statement of Earnings [Abstract]
Income Statement [Abstract]
Year 2, Cumulative
Short-duration Insurance Contracts, Historical Claims Duration, Year Two, Cumulative
Percentage on a cumulative basis of average payout, after reinsurance, in the second year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.
Other assets — derivatives
Derivative asset
Derivative Asset
Fair value - twelve months or more
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer
Impact of discount on workers' compensation policies
Short-Duration Insurance Contract, Discounted Liability, Discount
Insurance Product Line [Domain]
Product and Service [Domain]
Transfer out of Level 3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3
Fixed maturities fair value, Subtotal
Available-for-sale Securities, Debt Maturities Excluding ABS and MBS, Fair Value
Available for sale securities debt maturities excluding ABS and MBS fair value.
Acquisition costs incurred
Business Combination, Transaction Cost, Excluding Separately Recognized Transaction
Net investment income
Net investment income
Net Investment Income
Total
Parent [Member]
Restatement does not require Recovery
Restatement Does Not Require Recovery [Text Block]
Total liabilities accounted for at fair value
Liabilities, Fair Value Disclosure
Business Combination [Table]
Business Combination [Table]
Derivative, notional amount
Derivative, Notional Amount
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Effect of tax preference investments
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount
Schedule of fair values of assets acquired and liabilities assumed
Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block]
Year 5
Short-Duration Insurance Contracts, Historical Claims Duration, Year Five
City Area Code
City Area Code
Award Timing, How MNPI Considered
Award Timing, How MNPI Considered [Text Block]
Mortgage loans
Mortgages [Member]
Sales and settlements
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements
Fair value as a percentage of cost - twelve months or more
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Twelve Months Or Longer, Fair Value As Percentage Of Cost
Available for sale securities continuous unrealized loss position twelve months or longer fair value as percentage of cost.
Debt Securities, Trading, and Equity Securities, FV-NI [Table]
Debt Securities, Trading, and Equity Securities, FV-NI [Table]
Investing Activities:
Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract]
Percentage (based on unrealized loss) of available for sale fixed maturities that are in unrealized loss position and rated investment grade
Percentage (based on unrealized loss) of available for sale fixed maturities that are in unrealized loss position and rated investment grade
Percentage based on unrealized loss of available for sale fixed maturities that are in an unrealized loss position and rated investment grade.
Pay vs Performance Disclosure
Pay vs Performance Disclosure [Table]
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]
Cash flow hedging
Cash Flow Hedging [Member]
Other liabilities
Other Liabilities
Goodwill
Goodwill, beginning balance
Goodwill, ending balance
Goodwill
Current year
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year
U.S. federal
Deferred Federal Income Tax Expense (Benefit)
Foreign operations
Reserves For Foreign Operations [Member]
Reserves for foreign operations.
Transfer out of Level 3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3
Crop Risk Services
Crop Risk Services [Member]
Crop Risk Services
Auditor Name
Auditor Name
5.00% Senior Notes due September 2035
Senior Notes Due In September 2035 [Member]
Senior Notes Due In September 2035
Total cash and investments
Investments and Cash
Net of tax
Net of tax [Member]
Net of tax
Managed by third parties
Managed by Third Parties [Member]
Managed by third parties
Summary of operating loss carryforwards
Summary of Operating Loss Carryforwards [Table Text Block]
Fixed maturies, available for sale, amortized cost
Debt Securities, Available-for-Sale, Amortized Cost
Other Performance Measure, Amount
Other Performance Measure, Amount
U.S. government and government agencies
US Treasury and Government [Member]
Repayments of mortgage loans
Proceeds from Sale and Collection of Mortgage Notes Receivable
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Table]
Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Table]
Change in fair value of equity securities
Equity Securities, FV-NI, Gain (Loss)
Excess purchase price over net tangible assets acquired
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Excess Purchase Price Over Net Tangible Assets Acquired
Business combination, recognized identifiable assets acquired and liabilities assumed, excess purchase price over net tangible assets acquired
Derivative Instrument Risk [Axis]
Derivative Instrument [Axis]
Fair Value Measurements
Fair Value of Financial Instruments, Policy [Policy Text Block]
Capital surplus
Additional Paid in Capital, Common Stock
Investments:
Investments [Abstract]
Investment in subsidiaries
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures
Net cash provided by (used in) investing activities
Cash Provided by (Used in) Investing Activity, Including Discontinued Operation
Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table
Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member]
Nonvoting Preferred Stock
Nonvoting Preferred Stock [Member]
Nonvoting preferred stock.
Proceeds from sales and redemptions of investments
Proceeds from Sales and Redemptions of Investments by Managed Investment Entities
The cash inflow associated with sales, maturities, prepayments and redemptions of investments by managed investment entities.
Document Fiscal Year Focus
Document Fiscal Year Focus
Crop Insurance Contracts, Crop Year [Axis]
Crop Insurance Contracts, Crop Year [Axis]
Crop Insurance Contracts, Crop Year
Reinsurance information
Effects of Reinsurance [Table Text Block]
Basis of Presentation
Basis of Accounting, Policy [Policy Text Block]
Income Tax Reconciliation [Table]
Income Tax Reconciliation [Table]
Income Tax Reconciliation.
Operating lease right-of-use asset
Operating Lease, Right-of-Use Asset
Provision for income taxes as shown in the Statement of Earnings as a percentage of EBT
Effective Income Tax Rate Reconciliation, Percent
Operating lease expense
Operating Lease, Cost
Carrying Value
Reported Value Measurement [Member]
Weighted average period of cost expected to be recognized
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition
Exercise of stock options, shares
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period
Valuation allowance against deferred tax assets
Deferred Tax Assets, Valuation Allowance
Insurance [Domain]
Insurance [Domain]
Insurance.
Derivatives
Derivatives, Policy [Policy Text Block]
Segments of Operations
Segment Reporting Disclosure [Text Block]
Schedule of Goodwill [Table]
Goodwill [Table]
Statement of Cash Flows
Statement of Cash Flows [Policy Text Block]
Describes an entity's accounting policy related to the statement of cash flows.
Derivatives not designated as hedging instruments
Not Designated as Hedging Instrument [Member]
Tax effects
Tax Effects [Member]
Tax effects.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
U.S. federal
Current Federal Tax Expense (Benefit)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Available-for-sale securities in a continuous unrealized loss position
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Collateralized loan obligations and other asset-backed securities average life
Collateralized Loan Obligations and Other Asset-Backed Securities Average Life
Collateralized loan obligations and Other asset-backed securities average life.
Transfer into Level 3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3
Other liabilities
Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent
Compensation Actually Paid vs. Total Shareholder Return
Compensation Actually Paid vs. Total Shareholder Return [Text Block]
Contingent consideration — acquisitions
Business Combination, Contingent Consideration, Liability
Fair Value, Recurring and Nonrecurring [Table]
Fair Value, Recurring and Nonrecurring [Table]
Amortization of intangible assets
Amortization of Intangible Assets
Leases
Lessee, Leases [Policy Text Block]
Commissions and other underwriting expenses
Selling, General and Administrative Expense
Components of accumulated other comprehensive income (loss)
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Percentage (based on fair value) of available for sale fixed maturities that are in unrealized loss position and rated investment grade
Percentage (based on fair value) of available for sale fixed maturities that are in unrealized loss position and rated investment grade
Percentage (based on fair value) of available for sale fixed maturities that are in an unrealized loss position and rated investment grade.
Percent of total revenue derived from sales of property and casualty insurance outside of the United States
Disclosure on Geographic Areas, Property and Casualty Revenues Attributed to Foreign Countries
Property and casualty insurance revenues derived from customers of foreign countries.
Fixed maturities without a single maturity date, percent of fair value
Available For Sale Securities, Debt Maturities, Without Single Maturity Date, Fair Value Percent
The percent of fair value of fixed maturity securities without a single maturity date
Residential MBS
Residential MBS
Residential Mortgage-Backed Securities [Member]
Direct premiums written
Direct Premiums Written
Effect of foreign tax effects
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount
Number of CLOs formed during the period
Number Of Collateralized Loan Obligation Entities Formed During The Period
Number of collateralized loan obligation entities formed during the period.
Arrangement Duration
Trading Arrangement Duration
Business Segments [Axis]
Segments [Axis]
Fair Value by Liability Class [Domain]
Fair Value by Liability Class [Domain]
Fair Value by Liability Class [Domain]
Local Phone Number
Local Phone Number
Additional 402(v) Disclosure
Additional 402(v) Disclosure [Text Block]
Other investing activities, net
Payment for (Proceeds from) Other Investing Activity
Other operating activities, net
Other operating activities, net
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Other Item
Scheduled principal payments on debt after year five
Long-Term Debt, Maturity, after Year Five
Shares acquired and retired, shares
Stock Repurchased and Retired During Period, Shares
Equity in undistributed earnings of subsidiaries
Equity in Undistributed Pretax Earnings of Consolidated Subsidiaries
Portion of equity in pretax earnings of consolidated subsidiaries that was not distributed from subsidiaries.
Cash and cash equivalents
Business Combination, Recognized Asset Acquired, Cash and Cash Equivalent
Assets:
Assets [Abstract]
Total net unrealized gains (losses) on securities, pretax
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax
Underlying Security Market Price Change
Underlying Security Market Price Change, Percent
Deferred policy acquisition costs
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Deferred Policy Acquisition Cost
Debt Instrument [Axis]
Debt Instrument [Axis]
Average grant date fair value, forfeited
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value
Fair Value Measurements
Fair Value Disclosures [Text Block]
Gain (loss) on retirement of debt
Gain (Loss) on Extinguishment of Debt
Business Acquisitions [Line Items]
Business Combination [Line Items]
Shareholders’ equity:
Equity, Attributable to Parent [Abstract]
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments
Realized Gains (Losses) and Changes in Unrealized Appreciation (Depreciation) Related to Fixed Maturity and Equity Security Investments [Table Text Block]
Tabular disclosure of realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments.
Interest rate on debt instruments
Debt Instrument, Interest Rate, Stated Percentage
Investment, Name [Axis]
Investment, Name [Axis]
Entity Voluntary Filers
Entity Voluntary Filers
Other operating expenses
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Other Operating Expense
Short-duration Insurance Contracts, Accident Year [Domain]
Short-Duration Insurance Contracts, Accident Year [Domain]
Depreciation and amortization
Depreciation, Amortization and Accretion, Net
Retirements of managed investment entities’ liabilities
Retirement Of Managed Investment Entities Liabilities
Retirement of managed investment entities' liabilities.
Entity Registrant Name
Entity Registrant Name
Gains (losses) on interest rate swaps expected to be reclassified from AOCI to net earnings over the next 12 months.
Cash Flow Hedge Gain (Loss) to be Reclassified within 12 Months
Fixed maturities amortized cost, Subtotal
Available-for-sale Securities, Debt Maturities Excluding ABS and MBS, Amortized Cost
Available for sale securities debt maturities excluding ABS and MBS amortized cost.
Stock Price or TSR Estimation Method
Stock Price or TSR Estimation Method [Text Block]
Retained earnings
Retained Earnings, Unappropriated
Total assets accounted for at fair value
Assets, Fair Value Disclosure
Number of fixed maturities in an unrealized loss position
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions
Provision for expected credit losses
Premium Receivable, Credit Loss Expense (Reversal)
Operating and capital loss carryforwards [Line Items]
Tax Credit Carryforward [Line Items]
Equity securities
Payments to Acquire Equity Securities, FV-NI
Liability to return collateral related to swaps
Derivative Asset, Not Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash
Payable to return collateral related to interest rate swap assets
Average grant date fair value, granted
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value
Restatement Determination Date:
Restatement Determination Date [Axis]
Percentage of Level 3 assets that were priced using a discounted cash flow approach
Percentage Of Level Three Assets That Were Priced Using A Discounted Cash Flow Approach
Percentage of level three assets that were priced using a discounted cash flow approach.
Accumulated Other Comprehensive Income (Loss) [Table]
Accumulated Other Comprehensive Income (Loss) [Table]
Total income tax provision:
Income Tax Expense (Benefit), Continuing Operations [Abstract]
Shares issued:
Shares Issued [Abstract]
Shares issued.
Liabilities acquired:
Business Combination, Recognized Liability Assumed, Liability [Abstract]
Crop Insurance Contracts, Crop Year [Domain]
Crop Insurance Contracts, Crop Year [Domain]
Crop Insurance Contracts, Crop Year [Domain]
Effect of changes in tax laws or rates enacted in the current period
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount
Name
Trading Arrangement, Individual Name
Managed investment entities:
Managed Investments Entities [Abstract]
Managed investments entities.
Total net unrealized gains (losses) on cash flow hedges, pretax
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax
Debt instrument, repurchase amount
Debt Instrument, Repurchase Amount
Pension and other postretirement plan adjustments, tax
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax
Interest charges on intercompany borrowings
Interest Expense on Intercompany Borrowings
The cost of funds borrowed from subsidiaries that are accounted for as interest and are charged against earnings during the period.
Statement of Other Comprehensive Income [Abstract]
Statement of Comprehensive Income [Abstract]
Carrying amount of CLO loans in default
Carrying Amount Of Variable Interest Entity Loans In Default
Carrying amount of variable interest entity loans in default.
Perpetual preferred stocks
Preferred Stock [Member]
A&E reserves
Special Asbestos And Environmental Reserves [Member]
Special asbestos and environmental reserves.
Name
Awards Close in Time to MNPI Disclosures, Individual Name
Average grant date fair value, outstanding, beginning balance
Average grant date fair value, outstanding, ending balance
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value
Purchases
Amount Of Managed Investment Entities Liabilities Purchased During the Period
Amount of managed investment entities liabilities purchased during the period
Year 2
Short-Duration Insurance Contracts, Historical Claims Duration, Year Two
Aggregate Erroneous Compensation Not Yet Determined
Aggregate Erroneous Compensation Not Yet Determined [Text Block]
Change in unrealized
Change In Unrealized Appreciation Depreciation
Change in unrealized appreciation depreciation.
ICFR Auditor Attestation Flag
ICFR Auditor Attestation Flag
Stock-based compensation expense
APIC, Share-Based Payment Arrangement, Increase for Cost Recognition
Unrealized holding gains (losses) on securities arising during the period, tax
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax
Net earned premiums
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Premium Revenue
Percentage of level 3 assets that were priced using non-binding broker quotes or pricing services
Percentage Of Level Three Assets That Were Priced Using Non-Binding Broker Quotes or Pricing Services
Percentage of level 3 assets that were priced using non-binding broker quotes or pricing services.
Liability Class [Axis]
Liability Class [Axis]
Liability Class [Axis]
Auditor Firm ID
Auditor Firm ID
Segment [Domain]
Segments [Domain]
Income Statement Location [Axis]
Statement of Income Location, Balance [Axis]
Foreign jurisdictions
Income (Loss) from Continuing Operations before Income Taxes, Foreign
Fixed maturities
Total fixed maturities
Fixed Maturities [Member]
Investments
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]
Fair Value, Measurements, Fair Value Hierarchy [Domain]
Fair Value Hierarchy and NAV [Domain]
Investment securities
Deferred Tax Liabilities, Investments
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance
Short-Duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net
Statutory information
Statutory Information [Abstract]
Statutory information.
Accumulated net investment gain (loss) attributable to parent
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Earnings Per Share
Earnings Per Share, Policy [Policy Text Block]
Year 7
Short-Duration Insurance Contracts, Historical Claims Duration, Year Seven
Impairment allowance on mortgage loans and other investments
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)
Equity in net earnings of subsidiaries
Income (Loss) from Subsidiaries, Net of Tax
Senior Notes
Senior Notes [Member]
Fixed maturities
Payments to Acquire Debt Securities, Available-for-Sale
States, municipalities and political subdivisions
State and municipal
US States and Political Subdivisions Debt Securities [Member]
Total liabilities acquired
Business Combination, Recognized Liability Assumed, Liability
Subordinated Debentures
Subordinated Debt [Member]
All Executive Categories
All Executive Categories [Member]
Earnings before realized gains (losses) and income taxes
Operating Income (Loss), Before Realized Gains (Losses) and Income Taxes
The net result for the period of deducting operating expenses from operating revenues (excluding realized gains (losses) on securities and subsidiaries) before income taxes.
Provision for losses and LAE occurring in the current year
Current Year Claims and Claims Adjustment Expense
Amortization of deferred policy acquisition costs
Deferred Policy Acquisition Costs, Amortization Expense
Components of deferred tax assets and liabilities
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
Common Stock, no par value — 200,000,000 shares authorized — 83,422,202 and 83,978,258 shares outstanding
Common Stock, Value, Issued
Net earned premiums
Net earned premiums
Premiums Earned, Net
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Cash and cash equivalents of businesses acquired
Cash Acquired from Acquisition
Intangible assets acquired
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived
Business Combination [Axis]
Business Combination [Axis]
Excludes short-duration insurance contracts detail for accident years not separately presented
Excludes Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense Not Separately Presented [Member]
Excludes the undiscounted amount, after reinsurance, of the liability for unpaid claims and allocated claim adjustment expense for short-duration insurance contracts for accident years not separately presented in claim development information. Excludes unallocated claim adjustment expense.
Net investment income earned and investment expenses incurred
Investment Income [Table Text Block]
Assets of MIE
Assets of Managed Investment Entities [Member]
Assets of managed investment entities.
Premium Receivable, Allowance for Credit Loss [Roll Forward]
Premium Receivable, Allowance for Credit Loss [Roll Forward]
Net deferred tax asset
Deferred Tax Assets, Net
Expenses of managed investment entities
Expenses of Managed Investment Entities
Expenses of managed investment entities.
Reinsurance recoveries
Policyholder Benefits and Claims Incurred, Ceded
PEO Actually Paid Compensation Amount
PEO Actually Paid Compensation Amount
After ten years
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10
Mortgage loans
Payments to Acquire Mortgage Notes Receivable
Change in Fair Value [Axis]
Change in Fair Value [Axis]
Change in fair value
Hedging Designation [Axis]
Hedging Designation [Axis]
Pension and other postretirement plan adjustments
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax
Reclassification adjustment for investment income included in net earnings from, pretax
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax
Derivative Contract Type [Domain]
Derivative Contract [Domain]
Issuances of Common Stock
Proceeds from Issuance of Common Stock
Gross losses
Debt Securities, Available-for-Sale, Realized Loss
All Individuals
All Individuals [Member]
Long-term Debt, Type [Domain]
Long-Term Debt, Type [Domain]
Fair Value Disclosures [Abstract]
Fair Value Disclosures [Abstract]
Purchases of:
Payment for Investing Activity [Abstract]
Name
Forgone Recovery, Individual Name
Allowance for Credit Losses [Roll Forward]
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested
Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member]
5.125% Subordinated Debentures due December 2059
Subordinated Debentures due in December 2059 [Member]
Subordinated Debentures due in December 2059
Net (purchases) sales of trading securities
Proceeds from (Payments for) Trading Securities, Short-Term
Subordinated debt obligations
Subordinated Debt Obligations [Member]
Other benefit plans
Stock Issued During Period, Value, Employee Benefit Plan
Year 7, Cumulative
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven, Cumulative
Percentage on a cumulative basis of average payout, after reinsurance, in the seventh year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.
Cumulative Number of Reported Claims
Short-Duration Insurance Contract, Cumulative Number of Reported Claims
Erroneous Compensation Analysis
Erroneous Compensation Analysis [Text Block]
Workers' compensation insurance discount rate
Workers' Compensation Discount, Percent
Subsidiary 1
Subsidiary 1 [Member]
Subsidiary 1
Rule 10b5-1 Arrangement Terminated
Rule 10b5-1 Arrangement Terminated [Flag]
Statutory Accounting Practices [Table]
Statutory Accounting Practices [Table]
Erroneously Awarded Compensation Recovery
Erroneously Awarded Compensation Recovery [Table]
Title of 12(b) Security
Title of 12(b) Security
Net written premiums
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Premium Written
Other expenses
Other Expense [Member]
Write-offs charged against the allowance
Premium Receivable, Allowance for Credit Loss, Writeoff
Maturities of short term investments
Maturity Period Of Short Term Investment Maximum
Maturity period of short term investment maximum.
Reinsurance recoverable and premiums receivable, allowance for credit loss
Reinsurance Recoverable and Premiums Receivable, Allowance for Credit Loss [Table Text Block]
Tabular disclosure of allowance for credit loss on reinsurance recoverable and premiums receivable.
Long-term Debt, Fiscal Year Maturity [Abstract]
Long-Term Debt, Fiscal Year Maturity [Abstract]
Earnings per Common Share:
Earnings Per Share [Abstract]
Dividends from subsidiaries
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Consolidated Subsidiaries
Payments for losses and LAE of:
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Income tax penalties accrued
Unrecognized Tax Benefits, Income Tax Penalties Accrued
Lease payments due in 2030
Lessee, Operating Lease, Liability, to be Paid, Year Five
Sales of real estate, property and equipment
Proceeds From Sales Of Real Estate, Property and Equipment
The cash inflow associated with the sale of real estate, property and equipment.
Impact of nontaxable or nondeductible items:
Effective Income Tax Rate Reconciliation, Nontaxable or Nondeductible Items, Percent [Abstract]
Effective income tax rate reconciliation, nontaxable or nondeductible items, percent
Year 9
Short-Duration Insurance Contracts, Historical Claims Duration, Year Nine
Holding Gains (Losses) on Equity Securities Still Held [Table]
Holding Gains (Losses) on Equity Securities Still Held [Table]
Tabular disclosure of holding gains (losses) on equity securities still held
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Award Timing Disclosures [Line Items]
Realized gain on subsidiary from remeasurement
Business Combination, Achieved in Stages, Preacquisition Equity Interest in Acquiree, Remeasurement, Gain
Structured securities
Structured Securities [Member]
Structure securities such as mortgage back securities, collateralized loan obligations and other asset-backed securities
Net liability at beginning of period
Net liability at end of period
Total reserves, net of reinsurance
Liability for Unpaid Claims and Claims Adjustment Expense, Net
Assets and liabilities measured at fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Shareholders' Equity
Equity [Text Block]
Net unrealized gains (losses) on cash flow hedges:
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax [Abstract]
Net Earnings
Net earnings
Net earnings
Net Income (Loss) Attributable to Parent
Collateralized loan obligations
Collateralized Loan Obligations [Member]
Reconciliation of income taxes at the statutory rate and income taxes shown in the Statement of Earnings
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period
Effect of other income tax reconciliation adjustments as a percentage of EBT
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent
Percentage of internally developed Level 3 assets compared to total Level 3 assets
Percentage Of Internally Developed Level Three Assets Compared to Total Level 3 Assets
Percentage Of Internally Developed Level Three Assets Compared to Total Level 3 Assets
Preferred Stock, shares authorized
Preferred Stock, Shares Authorized
Segment Reporting Information [Line Items]
Segment Reporting Information [Line Items]
Repurchases of Common Stock
Payments for Repurchase of Common Stock
Adoption Date
Trading Arrangement Adoption Date
Special charges to increase asbestos and environmental reserves
Liability for Asbestos and Environmental Claims, Net, Period Increase (Decrease)
Impact of nontaxable or nondeductible items:
Effective Income Tax Rate Reconciliation, Nontaxable or Nondeductible Items, Amount [Abstract]
Effective income tax rate reconciliation, nontaxable or nondeductible items, amount
Operating and capital loss carryforwards [Table]
Tax Credit Carryforward [Table]
Customer relationships
Customer Relationships [Member]
Earnings before income taxes
Earnings before income taxes (“EBT”)
Operating Income (Loss)
APU
APU Consolidated And Its Subsidiaries [Member]
APU Consolidated and its subsidiaries.
GAFRI
GAFRI [Member]
GAFRI.
Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested
Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member]
One year or less
Available For Sale Securities Debt Maturities Within One Year Fair Value Percent
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value, Percent.
Class of Stock [Axis]
Class of Stock [Axis]
Accumulated net gain (loss) on cash flow hedges attributable to parent
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Write-off of amortizable intangible assets
Impairment of Intangible Assets, Finite-Lived
Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table
Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member]
Statement [Table]
Statement [Table]
Total deferred tax expense
Deferred Income Tax Expense (Benefit)
Adjustments:
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract]
Short-duration Insurance Contracts, Accident Year [Axis]
Short-Duration Insurance Contracts, Accident Year [Axis]
Financing Activities:
Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract]
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]
Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost, Fiscal Year Maturity [Abstract]
Benefit Plans
Postretirement and Postemployment Benefit Plans [Policy Text Block]
Disclosure of the accounting policy for postretirement and postemployment benefit plans sponsored by the entity.
Changes in asset balances of Level 3 financial assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
All Adjustments to Compensation
All Adjustments to Compensation [Member]
Amendment Flag
Amendment Flag
Tax benefit related to compensation costs
Share-Based Payment Arrangement, Expense, Tax Benefit
Fair Value, Fiscal Year Maturity [Abstract]
Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract]
Common Stock reserved for issuance under stock incentive plan (shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized
Unpaid losses and loss adjustment expenses
Balance at beginning of period
Gross unpaid losses and LAE included in the balance sheet
Liability for Claims and Claims Adjustment Expense
Fair Value Percent, Fiscal Year Maturity [Abstract]
Available For Sale Securities, Debt Maturities, Fair Value Percent, Fiscal Year Maturity [Abstract]
Available For Sale Securities, Debt Maturities, Fair Value Percent, Fiscal Year Maturity [Abstract]
Termination Date
Trading Arrangement Termination Date
Insider Trading Policies and Procedures Adopted
Insider Trading Policies and Procedures Adopted [Flag]
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]
Weighted-average discount rate
Operating Lease, Weighted Average Discount Rate, Percent
Year 5, Cumulative
Short-duration Insurance Contracts, Historical Claims Duration, Year Five, Cumulative
Percentage on a cumulative basis of average payout, after reinsurance, in the fifth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.
Year 10, Cumulative
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten, Cumulative
Percentage on a cumulative basis of average payout, after reinsurance, in the tenth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.
Basic (shares)
Weighted Average Number of Shares Outstanding, Basic
Unrecognized tax benefits that would impact the effective tax rate
Unrecognized Tax Benefits that Would Impact Effective Tax Rate
Short-duration Insurance Contracts, Historical Claims Duration [Table]
Short-Duration Insurance Contracts, Historical Claims Duration [Table]
Segment Reporting [Abstract]
Segment Reporting [Abstract]
Net unrealized gains (losses) on securities:
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax [Abstract]
Debt Disclosure [Abstract]
Debt Disclosure [Abstract]
4.50% Senior Notes due June 2047
Senior Notes Due In June 2047 [Member]
Senior Notes due in June 2047.
Percentage of investment of most subordinate debt tranche, maximum
Percentage of Investment of Most Subordinate Debt Tranche of Variable Interest Entity Maximum
Maximum percentage of investment of most subordinate debt tranche of variable interest entity.
Unpaid Losses and Loss Adjustment Expenses
Unpaid Policy Claims and Claims Adjustment Expense, Policy [Policy Text Block]
Unrealized holding gains (losses) on securities arising during the period, pretax
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax
Cash interest payments on long-term debt
Interest Paid, Including Capitalized Interest, Operating and Investing Activities
Forgone Recovery due to Expense of Enforcement, Amount
Forgone Recovery due to Expense of Enforcement, Amount
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Consolidated Entities [Axis]
Consolidated Entities [Axis]
Employee benefits
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits
Voting Preferred Stock
Voting Preferred Stock [Member]
Voting preferred stock.
Insurance claims and reserves
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Policyholder Liabilities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Real estate, property and equipment
Deferred Tax Liabilities, Real Estate, Property and Equipment
Amount of deferred tax liability attributable to taxable temporary differences from real estate, property, and equipment.
CLO earnings attributable to AFG
CLO earnings attributable to AFG
Earnings (Losses) Of Variable Interest Entities Attributable To Shareholders
Earnings (losses) of variable interest entities attributable to AFG shareholders.
Effect of cross-border tax laws
Effective Income Tax Rate Reconciliation, Cross-Border Tax Effect, Amount
Increase in allowance from acquisition of CRS
Premium Receivable, Allowance for Credit Loss, Period Increase (Decrease)
Reserves for claims and unpaid losses and LAE
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Liability for Future Policy Benefit, Loss, Claim and Loss Expense
Foreign currency translation adjustments
Foreign currency translation adjustments
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax
Insider Trading Arrangements [Line Items]
Issuances of managed investment entities’ liabilities
Proceeds From Issuance Of Managed Investment Entities
Proceeds from issuance of managed investment entities.
Equity securities
Equity Securities [Member]
Total liabilities
Liabilities
Dividends payments without violating the most restrictive debt covenants, minimum
Dividend Payments Without Violating Most Restrictive Debt Covenants
Amount of dividends that could be paid as of the balance sheet date without violating the most restrictive debt covenants.
Other operating lease liability information
Lessee, Operating Lease, Liability, Other Lease Information [Table Text Block]
Tabular disclosure of other operating lease liability information
Pension Adjustments Prior Service Cost
Pension Adjustments Prior Service Cost [Member]
Senior Notes, amount of the original debt instrument that was redeemed
Debt Instrument, Repurchased Face Amount
Material Terms of Trading Arrangement
Material Terms of Trading Arrangement [Text Block]
Short-duration Insurance Contracts, Claim Duration [Axis]
Short-Duration Insurance Contracts, Claim Duration [Axis]
Change in fair value of fixed maturities
Debt Securities, Trading and Convertible, Gain (Loss)
The change in fair value of debt securities classified as trading or derivatives embedded in convertible fixed maturities.
Other
Other Long-Term Investments [Member]
Analysis of changes in the liability for losses and loss adjustment expenses, net of reinsurance
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Other asset-backed securities
Other asset-backed securities
Asset-Backed Securities [Member]
Consolidation Items [Axis]
Consolidation Items [Axis]
Investment income
Gross Investment Income, Operating
Fixed maturities, available for sale at fair value (amortized cost — $11,101 and $10,687; allowance for expected credit losses of $21 and $34)
Available for sale (AFS) fixed maturities
Debt Securities, Available-for-Sale
Entity Incorporation, State or Country Code
Entity Incorporation, State or Country Code
Non-NEOs
Non-NEOs [Member]
Corporate and other
Corporate and other
Corporate Debt Securities [Member]
AFG's internal investment professionals
Number Of Internal Investment Professionals
Number of internal investment professionals.
Secured Overnight Financing Rate (SOFR) [Member]