Stock Appreciation Rights (SARs)
Stock Appreciation Rights (SARs) [Member]
Distributions
Proceeds Received From Distributions of Managed Investment Entities Liabilities
Proceeds received from distributions of managed investment entities liabilities.
Sales of fixed maturities
Proceeds from Sale of Debt Securities, Available-for-Sale
Revolving credit line
Line of Credit Facility, Maximum Borrowing Capacity
Purchases and issuances
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances
Change in:
Increase (Decrease) in Operating Capital [Abstract]
Number of interest rate swaps entered during the period
Number Of Interest Rate Swaps Entered During The Period
Number Of Interest Rate Swaps Entered During The Period
Award Type [Domain]
Award Type [Domain]
Sales and settlements
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales
Fair Value as of Grant Date
Award Grant Date Fair Value
Investment, Name [Domain]
Investment, Name [Domain]
Debt and Equity Securities, FV-NI [Line Items]
Debt and Equity Securities, FV-NI [Line Items]
Schedule of estimated fair values of assets acquired and liabilities assumed
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]
Businesses
Payments to acquire subsidiaries
Payments to Acquire Businesses, Gross
Available for sale fixed maturities
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block]
Deferred policy acquisition costs
Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Net
Foreign currency translation adjustments, tax
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax
Effect of stock-based compensation as a percentage of EBT
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Percent
Financial assets, Beginning Balance
Financial assets, Ending Balance
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value
Insider Trading Policies and Procedures [Line Items]
Rule 10b5-1 Arrangement Terminated
Rule 10b5-1 Arrangement Terminated [Flag]
Variable Interest Entity, Ownership [Roll Forward]
Variable Interest Entity, Ownership [Roll Forward]
Progression of the ownership of variable interest entities
Restatement does not require Recovery
Restatement Does Not Require Recovery [Text Block]
Shareholders' Equity
Equity [Text Block]
Subordinated Debentures
Subordinated Debt [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity [Line Items]
Effect of prior year income taxes
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount
Cash dividends paid on Common Stock
Payments of Ordinary Dividends, Common Stock
Diluted (USD per share)
Earnings Per Share, Diluted
Schedule of Investments [Table]
Schedule of Investments [Table]
Beginning Balance
Ending Balance
Reinsurance Recoverable, Allowance for Credit Loss
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
Derivative Asset, Statement of Financial Position [Extensible Enumeration]
Derivative Asset, Statement of Financial Position [Extensible Enumeration]
Trading Symbol
Trading Symbol
4.50% Subordinated Debentures due September 2060
Subordinated Debentures due in September 2060 [Member]
Subordinated Debentures due in September 2060
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Total net unrealized gains (losses) on securities, tax
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, Tax
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Debt Securities
Debt Securities [Member]
Cash and cash equivalents of businesses acquired
Cash Acquired from Acquisition
Write-offs charged against the allowance
Reinsurance, Loss on Uncollectible Accounts in Period, Amount
SOFR
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Fair Value Disclosures [Abstract]
Fair Value Disclosures [Abstract]
Accounting Policies [Table]
Accounting Standards Update and Change in Accounting Principle [Table]
Management fees paid to AFG
Management Fees Paid by Variable Interest Entities
Management fees paid by variable interest entities.
Shares exchanged — benefit plans (shares)
Stock Repurchased Shares Exchanged in Stock Compensation Plans, Shares
Repurchased shares exchanged in stock compensation plans, shares
Sales of other investments
Proceeds from Sale and Maturity of Other Investments
Investments
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]
Shareholders’ equity:
Equity, Attributable to Parent [Abstract]
Derivative Liability, Statement of Financial Position [Extensible Enumeration]
Derivative Liability, Statement of Financial Position [Extensible Enumeration]
Executive Category:
Executive Category [Axis]
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.
Changes in balances of Level 3 financial assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
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.
Dividends [Domain]
Dividends [Domain]
Accounting Policies
Significant Accounting Policies [Text Block]
Level 1
Fair Value, Inputs, Level 1 [Member]
Carrying Value
Reported Value Measurement [Member]
Statement, Equity Components [Axis]
Equity Components [Axis]
Equity Components [Axis]
Financial Instruments [Domain]
Financial Instruments [Domain]
Additional 402(v) Disclosure
Additional 402(v) Disclosure [Text Block]
Credit Losses on Financial Instruments
Credit Loss, Financial Instrument [Policy Text Block]
Hedging Relationship [Domain]
Hedging Relationship [Domain]
Investment Type [Axis]
Investment Type [Axis]
Contingent consideration — acquisitions
Contingent Consideration - Acquisitions [Member]
Contingent consideration of acquisitions.
Current year
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year
Purchases of investments
Purchases of Investments by Managed Investment Entities
The cash outflow from the purchase of investments by managed investment entities.
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
Level Three Assets That Were Priced Using Non Binding Broker Quotes
Level three assets that were priced using non-binding broker quotes.
Entity Small Business
Entity Small Business
Investments [Domain]
Investments [Domain]
Local Phone Number
Local Phone Number
Recovery of Erroneously Awarded Compensation Disclosure [Line Items]
Derivative, notional amount
Derivative, Notional Amount
Realized gains (losses) on:
Realized Gains (Losses) [Abstract]
Realized Gains (Losses)
Forgone Recovery due to Violation of Home Country Law, Amount
Forgone Recovery due to Violation of Home Country Law, Amount
Effect of stock-based compensation
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Amount
Equity securities reported at fair value
Marketable Securities [Table Text Block]
Portion at fair value measurement
Portion at Fair Value Measurement [Member]
Schedule of long-term debt instruments
Schedule of Long-Term Debt Instruments [Table Text Block]
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.
Purchases of:
Payments for Investing Activities [Abstract]
New Collateralized Loan Obligation Entities
New Collateralized Loan Obligation Entities [Member]
New collateralized loan obligation entities.
Property and Casualty Insurance
Property and Casualty Insurance [Member]
Property and casualty insurance.
Investments accounted for using the equity method
Equity Method Investments [Table Text Block]
Gross realized gains and losses on the sale of available for sale fixed maturity and equity security investments
Debt Securities, Available-for-Sale, Realized Gain (Loss) [Abstract]
After ten years
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10
Managed Investment Entities
Consolidation, Variable Interest Entity, Policy [Policy Text Block]
Total revenues
Revenues
Fair Value by Liability Class [Domain]
Fair Value by Liability Class [Domain]
Aggregate Available
Trading Arrangement, Securities Aggregate Available Amount
Insider Trading Policies and Procedures Not Adopted
Insider Trading Policies and Procedures Not Adopted [Text Block]
Award Type [Axis]
Award Type [Axis]
Anti-dilutive potential common shares related to stock-based compensation plans (shares)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Preferred Stock, par value (USD per share)
Preferred Stock, No Par Value
Document Quarterly Report
Document Quarterly Report
Dividend reinvestment plan (shares)
Stock Issued During Period, Shares, Dividend Reinvestment Plan
Total payments
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid
Fair Value, Measurements, Fair Value Hierarchy [Domain]
Fair Value Hierarchy and NAV [Domain]
Hedging Designation [Axis]
Hedging Designation [Axis]
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
PEO Actually Paid Compensation Amount
PEO Actually Paid Compensation Amount
Derivatives, Fair Value [Line Items]
Derivatives, Fair Value [Line Items]
Other expenses
Other Expense [Member]
Real Estate [Domain]
Real Estate [Domain]
Unearned premiums
Unearned Premiums
5.625% Subordinated Debentures due June 2060
Subordinated Debentures Due In June 2060 [Member]
Subordinated Debentures Due In June 2060
Amortizable intangible assets related to property and casualty insurance acquisitions
Finite-Lived Intangible Assets, Net
Accumulated amortization
Finite-Lived Intangible Assets, Accumulated Amortization
Insurance [Abstract]
Insurance [Abstract]
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.
Stock Price or TSR Estimation Method
Stock Price or TSR Estimation Method [Text Block]
Consideration transferred
Business Combination, Consideration Transferred
Effect of nondeductible expenses
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount
Security Exchange Name
Security Exchange Name
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.
Stock-Based Compensation
Share-Based Payment Arrangement [Policy Text Block]
Schedule of Investment Income, Reported Amounts, by Category [Table]
Investment Income [Table]
5.25% Senior Notes due April 2030
Senior Notes Due In April 2030 [Member]
Senior Notes due in April 2030
Fair value, Total, Percent
Available For Sale Securities Debt Maturities Fair Value Percent
Available-for-sale Securities, Debt Maturities, Fair Value, Total, Percent.
Commissions and other underwriting expenses
Selling, General and Administrative Expense
Effect of dividends received deduction as a percentage of EBT
Effective Income Tax Rate Reconciliation, Deduction, Dividend, Percent
Accumulated other comprehensive income (loss), net of tax
AOCI beginning balance
AOCI ending balance
Accumulated Other Comprehensive Income (Loss), Net of Tax
Employee Stock Option
Employee Stock Option [Member]
Derivatives
Derivative Instruments and Hedging Activities Disclosure [Text Block]
Investments
Investment, Policy [Policy Text Block]
Effect of ESOP dividend paid deduction
Effective Income Tax Rate Reconciliation, Deduction, Employee Stock Ownership Plan Dividend, Amount
Face amount of debt repurchased
Debt Instrument, Repurchased Face Amount
Maximum
Maximum
Maximum [Member]
Depreciation and amortization
Depreciation, Amortization and Accretion, Net
Document Type
Document Type
Interest and Amortization [Domain]
Interest and Amortization [Domain]
Interest and Amortization [Domain]
Goodwill recorded
Goodwill, Acquired During Period
Total costs and expenses
Benefits, Losses and Expenses
Tabular List, Table
Tabular List [Table Text Block]
Scheduled principal payments on debt thereafter
Long-Term Debt, Maturity, after Year Five
Investment in CLO tranches
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount
Net unrealized gains (losses) on securities:
Debt Securities, Unrealized Gain (Loss) [Abstract]
Allowance for Credit Losses [Roll Forward]
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Basis of Presentation
Basis of Accounting, Policy [Policy Text Block]
Fixed maturities
Payments to Acquire Debt Securities, Available-for-Sale
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.
Business Acquisition [Axis]
Business Acquisition [Axis]
Sales
Proceeds Received Related to Sales of Managed Investment Entities Liabilities
Proceeds received related to sales of managed investment entities liabilities during the period
Costs and Expenses:
Benefits, Losses and Expenses [Abstract]
Variable Rate [Axis]
Variable Rate [Axis]
Net investment income
Net investment income
Net investment income
Net Investment Income
Title of 12(b) Security
Title of 12(b) Security
Other liabilities
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other
Aggregate Erroneous Compensation Not Yet Determined
Aggregate Erroneous Compensation Not Yet Determined [Text Block]
Collateralized loan obligations
Collateralized Loan Obligations [Member]
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Abstract]
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
Forgone Recovery due to Expense of Enforcement, Amount
Forgone Recovery due to Expense of Enforcement, Amount
Foreign currency translation and other
Liability for Unpaid Claims and Claims Adjustment Expense, Foreign Currency Translation Gain (Loss)
Unrealized holding gains (losses) on securities arising during the period, tax
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax
Entity Tax Identification Number
Entity Tax Identification Number
Statistical Measurement [Axis]
Statistical Measurement [Axis]
Entity Interactive Data Current
Entity Interactive Data Current
Gross realized gains and losses on available for sale fixed maturity and equity security investments
Schedule of Realized Gain (Loss) [Table Text Block]
Long-Term Debt
Long-Term Debt [Text Block]
Debt Securities, Available-for-sale [Table]
Debt Securities, Available-for-Sale [Table]
Repayments of mortgage loans
Proceeds from Sale and Collection of Mortgage Notes Receivable
Effect of ESOP dividend paid deduction as a percentage of EBT
Effective Income Tax Rate Reconciliation, Deduction, Employee Stock Ownership Plan Dividend, Percent
Transfer into Level 3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Measure:
Measure [Axis]
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure [Abstract]
Name
Outstanding Recovery, Individual Name
Entity Incorporation, State or Country Code
Entity Incorporation, State or Country Code
Goodwill
Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]
Total return swap
Total Return Swap [Member]
Derivatives
Derivatives, Policy [Policy Text Block]
Investment income
Investment Income of Managed Investment Entities
Investment income of managed investment entities.
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
Common Stock, shares outstanding (shares)
Beginning Balance (shares)
Ending Balance (shares)
Common Stock, Shares, Outstanding
Real estate and other investments
Other Investments
Premium Receivable, Allowance for Credit Loss [Roll Forward]
Premium Receivable, Allowance for Credit Loss [Roll Forward]
Transfer out of Level 3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3
Liabilities of managed investment entities
Variable Interest Entity, Liabilities
Variable Interest Entity, Liabilities
Earnings (losses) on derivatives
Gain (Loss) on Derivative Instruments, Net, Pretax
PEO
PEO [Member]
Other expenses
Other Cost and Expense, Operating
Other operating activities, net
Other Operating Activities, Cash Flow Statement
Schedule of Variable Interest Entities [Table]
Schedule of Variable Interest Entities [Table]
Net cash provided by (used in) investing activities
Net Cash Provided by (Used in) Investing Activities
Other specialty
Specialty Other Insurance [Member]
Specialty Other Insurance.
Equity securities, at fair value
Equity securities
Equity Securities, FV-NI, Current
Reclassification adjustment for investment income included in net earnings, pretax
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax
Interest rate swaps
Interest Rate Swap [Member]
Debt Instrument [Axis]
Debt Instrument [Axis]
Number of fixed maturity securities in an unrealized loss position
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions
Shares acquired and retired
Stock Repurchased and Retired During Period, Value
Changes in the goodwill
Goodwill, Period Increase (Decrease)
Outstanding Aggregate Erroneous Compensation Amount
Outstanding Aggregate Erroneous Compensation Amount
Unfunded commitments to limited partnerships
Unfunded Commitments To Limited Partnerships
Represents commitments to fund credit facilities and contribute capital to certain limited partnership investments at a future date.
Total net unrealized gains (losses) on cash flow hedges, tax
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax
Total liabilities
Total liabilities
Liabilities
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.
Net investment income
Investment Income [Member]
Non-Rule 10b5-1 Arrangement Adopted
Non-Rule 10b5-1 Arrangement Adopted [Flag]
New collateralized loan obligation temporary warehousing entities
New Collateralized Loan Obligation Temporary Warehousing Entities [Member]
New collateralized loan obligation temporary warehousing entities
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
Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]
Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]
Foreign currency translation adjustments, pretax
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax
Other comprehensive income (loss), pretax
Other Comprehensive Income (Loss), before Tax
Fair value - less than twelve months
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months
Awards Close in Time to MNPI Disclosures, Table
Awards Close in Time to MNPI Disclosures [Table Text Block]
Segments of Operations
Segment Reporting, Policy [Policy Text Block]
Perpetual preferred stocks
Preferred Stock [Member]
Fixed maturities, trading at fair value
Trading fixed maturities
Debt Securities, Trading
Equity securities
Equity Securities [Member]
Fair value of potential contingent consideration
Business Combination, Contingent Consideration, Liability
Property and casualty insurance net earned premiums
Total premiums earned
Premiums Earned, Net, Property and Casualty
Interest and Amortization [Axis]
Interest and Amortization [Axis]
Interest and amortization
Other liabilities
Other Liabilities
Earnings Per Share
Earnings Per Share, Policy [Policy Text Block]
Level three assets, equity securities, priced using broker quotes and internal models
Level Three Assets, Equity Securities, Priced Using Broker Quotes And Internal Models
Level three assets, equity securities priced using broker quotes and internal models
Goodwill and Other Intangibles
Goodwill and Intangible Assets Disclosure [Text Block]
Contingent consideration - acquisitions, Total Level 3 liabilities
Financial liabilities, Beginning Balance
Financial liabilities, Ending Balance
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value
Mortgage loans
Payments to Acquire Mortgage Notes Receivable
Components of accumulated other comprehensive income (loss)
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Fair value per share of restricted common stock issued under Stock Incentive Plan
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
U.S. government and government agencies
U.S. government agency
US Treasury and Government [Member]
Other benefit plans
Stock Issued During Period, Value, Employee Benefit Plan
Other asset-backed securities
Other asset-backed securities
Asset-Backed Securities [Member]
Net cash provided by operating activities
Net Cash Provided by (Used in) Operating Activities
Percentage of level three assets, equity securities, priced using broker quotes and internal models
Percentage Of Level Three Assets, Equity Securities, Priced Using Broker Quotes And Internal Models
Percentage of level three assets, equity securities priced using broker quotes and internal models
Class of Stock [Axis]
Class of Stock [Axis]
Entities [Table]
Entities [Table]
Erroneously Awarded Compensation Recovery
Erroneously Awarded Compensation Recovery [Table]
Subsidiary
Realized loss on subsidiary
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.
Award Timing, How MNPI Considered
Award Timing, How MNPI Considered [Text Block]
Entity Information [Line Items]
Entity Information [Line Items]
Business Combination and Asset Acquisition [Abstract]
Gross gains
Debt Securities, Available-for-Sale, Realized Gain
Number of collateralized loan obligation entities
Number of Collateralized Loan Obligation Entities
Number of collateralized loan obligation entities.
Total cash and investments
Investments and Cash
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain (Loss), before Tax
Goodwill impairment loss
Goodwill, Impairment Loss
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table]
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.
Subsegments [Axis]
Subsegments [Axis]
Foreign currency translation adjustments
Foreign currency translation adjustments
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax
Accumulated gain (loss), net, cash flow hedge, parent
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Total liabilities acquired
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities
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.
Entity Emerging Growth Company
Entity Emerging Growth Company
Shares exchanged — benefit plans
Stock Repurchased Shares Exchanged in Stock Compensation Plans, Value
Stock repurchased, shares exchanged in stock compensation plans, value.
Discount and Issue Costs
Debt Issuance Costs, Net
Fair Value, Fiscal Year Maturity [Abstract]
Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract]
Insurance [Table]
Insurance [Table]
Insurance
AFG
Parent Company [Member]
Intangible assets acquired
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles
Pay vs Performance Disclosure, Table
Pay vs Performance [Table Text Block]
Title
Trading Arrangement, Individual Title
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.
Common Stock
Common Shares
Common stocks
Common Stock [Member]
Pension and OPRP adjustments
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax
Individual:
Individual [Axis]
Entity Address, Postal Zip Code
Entity Address, Postal Zip Code
Income Statement Location [Domain]
Income Statement Location [Domain]
Average life of ABS
Collateralized Loan Obligations and Other Asset-Backed Securities Average Useful Life
Collateralized loan obligations and Other asset-backed securities average useful life.
Changes in balances of Level 3 financial liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
Losses and loss adjustment expenses
Policyholder Benefits and Claims Incurred, Net, Property, Casualty and Liability
Effect of tax exempt interest
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount
Beginning Balance
Ending Balance
Equity, Including Portion Attributable to Noncontrolling Interest
Selected financial information related to collateralized loan obligations
Financial Information Related to Collateralized Loan Obligations [Abstract]
Financial information related to collateralized loan obligations.
Investments:
Investments [Abstract]
Minimum
Minimum
Minimum [Member]
Average number of Common Shares:
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Private equity
Equity Method Investments, Private Equity Funds [Member]
Equity Method Investments, Private Equity Funds
Change in Fair Value [Domain]
Change in Fair Value [Domain]
Change in Fair Value [Domain]
Other comprehensive loss, net of tax
Other comprehensive income (loss)
Other Comprehensive Income (Loss), Net of Tax
New interest rate swaps entered during the period
New Interest Rate Swaps Entered During Period [Member]
New interest rate swaps entered during the period
Contingent consideration possible to be paid, maximum
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High
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
Statement of Cash Flows [Abstract]
Statement of Cash Flows [Abstract]
Assets:
Assets [Abstract]
Award Timing MNPI Disclosure
Award Timing MNPI Disclosure [Text Block]
Total losses and LAE incurred
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims
Mortgage loans and other investments
Mortgage Loans And Other Investments [Member]
Mortgage loans and other investments.
After ten years
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10
Tangible assets acquired:
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Derivatives included in the Balance Sheet at fair value
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
Verikai, Inc.
Verikai, Inc. [Member]
Verikai, Inc.
Net cash used in financing activities
Net Cash Provided by (Used in) Financing Activities
Contingencies
Commitments and Contingencies Disclosure [Text Block]
Other investing activities, net
Payments for (Proceeds from) Other Investing Activities
Retained Earnings
Retained Earnings [Member]
Amount of goodwill expected to be tax deductible
Business Acquisition, Goodwill, Expected Tax Deductible Amount
Adjustment to Non-PEO NEO Compensation Footnote
Adjustment to Non-PEO NEO Compensation Footnote [Text Block]
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
Basic (USD per share)
Earnings Per Share, Basic
Accounting Policies [Abstract]
Accounting Policies [Abstract]
Net of tax
Marketable Securities [Member]
Marketable Securities.
Erroneous Compensation Analysis
Erroneous Compensation Analysis [Text Block]
Total pretax
Pretax [Member]
Total Pretax.
Beginning Balance
Ending Balance
Premium Receivable, Allowance for Credit Loss
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]
Operating lease liability, current, Statement of Financial Position
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]
Document Transition Report
Document Transition Report
Award Timing Predetermined
Award Timing Predetermined [Flag]
Crop year 2022
Crop Insurance Contract, Crop Year 2022 [Member]
Crop Insurance Contract, Crop Year 2022
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.
Schedule of Business Acquisitions, by Acquisition [Table]
Schedule of Business Acquisitions, by Acquisition [Table]
Reclassification adjustment for investment income included in net earnings, tax
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax
Dividend reinvestment plan
Stock Issued During Period, Value, Dividend Reinvestment Plan
Increase in allowance from acquisition of CRS
Premium Receivable, Allowance for Credit Loss, Period Increase (Decrease)
Payments for losses and LAE of:
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Net investment income earned and investment expenses incurred
Investment Income [Table Text Block]
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]
Derivative Instrument [Axis]
Derivative Instrument [Axis]
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward]
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward]
Less reinsurance recoverables, net of allowance
Add back reinsurance recoverables, net of allowance
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments
Total net unrealized gains (losses) on cash flow hedges, pretax
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax
Principal
Long-Term Debt, Gross
Level three 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.
Liability Class [Axis]
Liability Class [Axis]
All Trading Arrangements
All Trading Arrangements [Member]
One year or less
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One
All Adjustments to Compensation
All Adjustments to Compensation [Member]
Realized before impairments
Marketable Security, Realized Gain (Loss)
Percentage of level 3 assets that were priced using non-binding broker quotes
Percentage Of Level Three Assets That Were Priced Using Non-Binding Broker Quotes
Percentage of level 3 assets that were priced using non-binding broker quotes.
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.
Compensation Amount
Outstanding Recovery Compensation Amount
Excess purchase price over net tangible assets acquired
BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedExcessPurchasePriceOverNetTangibleAssetsAcquired
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Excess Purchase Price Over Net Tangible Assets Acquired
3.50% Senior Notes due August 2026
Senior Notes Due In August 2026 [Member]
Senior Notes due in August 2026.
Receivable for collateral posted related to swaps
Receivable for Collateral Posted Related to Swaps
Receivable for collateral posted related to swaps
Write-offs charged against the allowance
Premium Receivable, Allowance for Credit Loss, Writeoff
Derivative asset
Derivative Asset
Statement of Comprehensive Income [Abstract]
Statement of Comprehensive Income [Abstract]
Gross written premiums
Premiums Written, Gross
Specialty casualty
Specialty Casualty Insurance [Member]
Specialty casualty.
Scheduled principal payments on debt in year one
Long-Term Debt, Maturity, Year One
Schedule of Segment Reporting Information, by Segment [Table]
Schedule of Segment Reporting Information, by Segment [Table]
Other assets
Other Assets
Weighted average common shares adjustment related to stock-based compensation (shares)
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements
Holding gains (losses) on equity securities
Equity Securities, FV-NI, Unrealized Gain (Loss)
Document Period End Date
Document Period End Date
Increase in allowance from acquisition of CRS
Reinsurance Recoverable, Allowance for Credit Loss, Period Increase (Decrease)
Adoption Date
Trading Arrangement Adoption Date
Segment Reporting Information [Line Items]
Segment Reporting Information [Line Items]
Provision for income taxes
Provision for income taxes as shown on the Statement of Earnings
Income Tax Expense (Benefit)
Designated as hedging instrument
Designated as Hedging Instrument [Member]
Fair Value Measurements
Fair Value Disclosures [Text Block]
5.875% Subordinated Debentures due March 2059
Subordinated Debentures Due In March 2059 [Member]
Subordinated Debentures Due In March 2059
Unrealized Loss - Twelve months or more
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-Sale [Line Items]
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
Compensation Actually Paid vs. Company Selected Measure
Compensation Actually Paid vs. Company Selected Measure [Text Block]
Specialty financial
Specialty Financial Insurance [Member]
Specialty Financial.
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]
Other
Other Long-term Debt [Member]
Other Long-term Debt.
Unrealized loss - less than twelve months
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss
Cash and cash equivalents
Cash and Cash Equivalents, at Carrying Value
Investment and other income, net
Investment and Other Income, Net
Net investment income plus other income less other expenses.
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.
Shares acquired and retired (shares)
Stock Repurchased and Retired During Period, Shares
Interest rate on revolving debt facility
Debt Instrument, Basis Spread on Variable Rate
Compensation Actually Paid vs. Other Measure
Compensation Actually Paid vs. Other Measure [Text Block]
Effect of change in valuation allowance as a percentage of EBT
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent
Effect of dividends received deduction
Effective Income Tax Rate Reconciliation, Deduction, Dividends, Amount
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.
Amount invested in a temporary warehousing entity
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
Capital surplus
Additional Paid in Capital, Common Stock
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
Sales of equity securities
Proceeds from Sale of Equity Securities, FV-NI
Equity in earnings of partnerships and similar investments
Income (Loss) from Equity Method Investments
Other liabilities — derivatives
Other Liabilities [Member]
Cover [Abstract]
Cover [Abstract]
Agents’ balances and premiums receivable
Premiums Receivable, Net
Effect of tax exempt interest as a percentage of EBT
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent
Securities
Realized gains (losses) on securities
Marketable Securities, Realized Gain (Loss)
Purchases and issuances
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases
Cash flow hedging
Cash Flow Hedging [Member]
Segments of Operations
Segment Reporting Disclosure [Text Block]
Foreign government
Debt Security, Government, Non-US [Member]
Net Change in Cash and Cash Equivalents
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect
Operating lease, renewal term
Lessee, Operating Lease, Renewal Term
Equity Component [Domain]
Equity Component [Domain]
Non-GAAP Measure Description
Non-GAAP Measure Description [Text Block]
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.
Entity Current Reporting Status
Entity Current Reporting Status
Earnings before income taxes
Earnings before income taxes (“EBT”)
Operating Income (Loss)
Realized (gains) losses on investing activities
Realized Investment Gains (Losses)
Average life of MBS
Mortgage Backed Securities Average Useful Life
Mortgage backed securities average useful life.
Consolidated Entities [Domain]
Consolidated Entities [Domain]
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.
Business Segments [Axis]
Segments [Axis]
Fair Value
Estimate of Fair Value Measurement [Member]
Other comprehensive loss, net of tax:
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Payable to reinsurers
Increase (Decrease) in Reinsurance Payables
Dividends [Axis]
Dividends [Axis]
Forgone Recovery due to Disqualification of Tax Benefits, Amount
Forgone Recovery due to Disqualification of Tax Benefits, Amount
Mortgage-backed securities
Collateralized Mortgage-Backed Securities [Member]
Awards Close in Time to MNPI Disclosures
Awards Close in Time to MNPI Disclosures [Table]
Amount borrowed under revolving credit facility
Long-Term Line of Credit
Customer relationships
Customer Relationships [Member]
Fixed maturities with embedded derivatives
Fixed Maturity Securities with Embedded Derivatives [Member]
Fixed maturity securities with embedded derivatives.
Roll forward of allowance for credit losses on fixed maturity securities
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Table Text Block]
Real Estate, Type of Property [Axis]
Real Estate, Type of Property [Axis]
Real estate-related investments
Equity Method Investments, Real Estate-related Investments [Member]
Equity Method Investments, Real Estate-related Investments
Consolidated Entities [Axis]
Consolidated Entities [Axis]
Variable Rate [Domain]
Variable Rate [Domain]
Total realized/unrealized gains (losses) included in Net income
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings
Pay vs Performance Disclosure [Line Items]
Statistical Measurement [Domain]
Statistical Measurement [Domain]
Underlying Security Market Price Change
Underlying Security Market Price Change, Percent
Cash and cash equivalents
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss
Assets of managed investment entities
Variable Interest Entity, Assets
Variable Interest Entity, Assets
Percentage of level 3 equity investments that do not qualify for equity accounting
Percentage of Level Three Assets, Equity Investments That Do Not Qualify for Equity Accounting
Percentage of Level three assets, equity investments that do not qualify for equity accounting
Common Stock and Capital Surplus
Common Stock Including Additional Paid in Capital [Member]
Statement of Stockholders' Equity [Abstract]
Statement of Stockholders' Equity [Abstract]
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.
Investments, Debt and Equity Securities [Abstract]
Investments, Debt and Equity Securities [Abstract]
Variable interest entity, primary beneficiary
Variable Interest Entity, Primary Beneficiary [Member]
MNPI Disclosure Timed for Compensation Value
MNPI Disclosure Timed for Compensation Value [Flag]
Segment Reporting [Abstract]
Segment Reporting [Abstract]
Fixed maturities without single maturity date
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value
Transfer out of Level 3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3
Fixed maturities:
Total fixed maturities
Fixed Maturities [Member]
Restatement Determination Date:
Restatement Determination Date [Axis]
Reductions due to sales or redemptions
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Securities Sold
Investment, Name [Axis]
Investment, Name [Axis]
Corporate and other
Corporate and other
Corporate Debt Securities [Member]
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
Issuances of Common Stock
Proceeds from Issuance of Common Stock
Property and transportation
Specialty Property And Transportation Insurance [Member]
Specialty Property and transportation.
Income Taxes
Income Tax Disclosure [Text Block]
Securities
Realized Gains (Losses) On Securities [Member]
Primary financial statement caption encompassing realized gains (losses) on securities.
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
Equity Method Investments, Private Debt Funds [Member]
Equity Method Investments, Private Debt Funds
Leases
Lessee, Leases [Policy Text Block]
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)
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
Effect of change in valuation allowance
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount
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.
Business Acquisition [Line Items]
Business Acquisition [Line Items]
Fair Value, Recurring and Nonrecurring [Table]
Fair Value, Recurring and Nonrecurring [Table]
PEO Total Compensation Amount
PEO Total Compensation Amount
Hedging Relationship [Axis]
Hedging Relationship [Axis]
Payable to reinsurers
Reinsurance Payable
Trading Arrangements, by Individual
Trading Arrangements, by Individual [Table]
Level 3
Fair Value, Inputs, Level 3 [Member]
After five years through ten years
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10
Exercise of stock options
Stock Issued During Period, Value, Stock Options Exercised
Non-PEO NEO Average Compensation Actually Paid Amount
Non-PEO NEO Average Compensation Actually Paid Amount
Other comprehensive income (loss), tax
Other Comprehensive Income (Loss), Tax
Net Earnings
Net earnings
Net Income (Loss)
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.
Derivative Contract [Domain]
Derivative Contract [Domain]
Changed Peer Group, Footnote
Changed Peer Group, Footnote [Text Block]
Company Selected Measure Name
Company Selected Measure Name
After one year through five years
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five
Insurance [Line Items]
Insurance [Line Items]
Insurance
Liabilities and Equity:
Liabilities and Equity [Abstract]
Face amount of managed investment entities liabilities purchased 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.
Gross unrealized losses on fixed maturities
Fixed maturities, available for sale, gross unrealized, losses
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax
Other lines
Other Lines [Member]
Other lines.
Exercise of stock options (shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period
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
Accumulated Other Comprehensive Income, Net of Tax ("AOCI")
Comprehensive Income, Policy [Policy Text Block]
Significant Accounting Policies [Line Items]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Name
Measure Name
Name
Forgone Recovery, Individual Name
Goodwill
Goodwill
Measurement Basis [Axis]
Measurement Basis [Axis]
Underlying Securities
Award Underlying Securities Amount
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.
Premium Recognition
Insurance Premiums Revenue Recognition, Policy [Policy Text Block]
Prior years
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years
Level 3 assets that were priced by pricing services.
Level Three Assets That Were Priced by Pricing Services.
Level three assets that were priced by pricing services.
Fair Value Measurement [Domain]
Fair Value Measurement [Domain]
Scheduled principal payments on debt remainder of fiscal year
Long-Term Debt, Maturity, Remainder of Fiscal Year
Cash dividends per Common Share (USD per share)
Common Stock, Dividends, Per Share, Declared
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
Common Stock, par value (USD per share)
Common Stock, No Par Value
Sales and settlements
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements
Aggregate unpaid principal balance of variable interest entity 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
Net Investment Income [Line Items]
Net Investment Income [Line Items]
Available for sale fixed maturity securities by contractual maturity date
Investments Classified by Contractual Maturity Date [Table Text Block]
Revolving credit facility term
Debt Instrument, Term
Debt Instrument, Name [Domain]
Debt Instrument, Name [Domain]
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.
Reclassification from accumulated other comprehensive income
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax
Income Statement Location [Axis]
Income Statement Location [Axis]
Financial assets:
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Other benefit plans (shares)
Stock Issued During Period, Shares, Employee Benefit Plan
Fair value of financial instruments
Fair Value, by Balance Sheet Grouping [Table Text Block]
Commercial MBS
Commercial MBS
Commercial Mortgage-Backed Securities [Member]
Other Performance Measure, Amount
Other Performance Measure, Amount
Net liability at beginning of year
Net liability at end of period
Liability for Unpaid Claims and Claims Adjustment Expense, Net
Investing Activities:
Net Cash Provided by (Used in) Investing Activities [Abstract]
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Interest charges on borrowed money
Interest Expense
Loss on retirement of debt
Gain (Loss) on Extinguishment of Debt
Stockholders' Equity Note [Abstract]
Stockholders' Equity Note [Abstract]
Trading Arrangement:
Trading Arrangement [Axis]
Long-term Debt, Type [Domain]
Long-Term Debt, Type [Domain]
Entity File Number
Entity File Number
Assets and liabilities measured at fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Scheduled principal payments on debt in year three
Long-Term Debt, Maturity, Year Three
Accumulated net investment gain (loss) attributable to parent
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Debt Securities, Trading, and Equity Securities, FV-NI [Table]
Debt Securities, Trading, and Equity Securities, FV-NI [Table]
Fixed maturities, available for sale, allowance for expected credit losses
Beginning balance
Ending balance
Debt Securities, Available-for-Sale, Allowance for Credit Loss
Amortization of intangible assets
Amortization of Intangible Assets
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Entity Shell Company
Entity Shell Company
Business Acquisition, Acquiree [Domain]
Business Acquisition, Acquiree [Domain]
Restatement Determination Date
Restatement Determination Date
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.
Other liabilities
Increase (Decrease) in Other Operating Liabilities
Rule 10b5-1 Arrangement Adopted
Rule 10b5-1 Arrangement Adopted [Flag]
Cash and cash equivalents at beginning of period
Cash and cash equivalents at end of period
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents
Asset Class [Axis]
Asset Class [Axis]
Fair Value - Twelve months or more
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer
Total assets accounted for at fair value
Assets, Fair Value Disclosure
Long-term debt
Carrying Value
Long-Term Debt
Reclassification of Cash Flow Hedge Gain (Loss) [Abstract]
Reclassification of Cash Flow Hedge Gain (Loss) [Abstract]
Scheduled principal payments on debt in year four
Long-Term Debt, Maturity, Year Four
Fair value as 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.
Accumulated foreign currency adjustment attributable to parent
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Total net unrealized gains (losses) on securities, pretax
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax
Percentage (based on amount of unrealized loss) of available for sale fixed maturities that are in an 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.
Comprehensive income (loss)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Provision (credit) for expected credit losses
Reinsurance Recoverable, Credit Loss Expense (Reversal)
Entity Address, Address Line One
Entity Address, Address Line One
Crop Risk Services
Crop Risk Services [Member]
Crop Risk Services
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Managed by third parties
Managed by Third Parties [Member]
Managed by third parties
Income Statement [Abstract]
Income Statement [Abstract]
Schedule of Investments [Line Items]
Schedule of Investments [Line Items]
Insider Trading Policies and Procedures Adopted
Insider Trading Policies and Procedures Adopted [Flag]
Cash and cash equivalents
Cash and Cash Equivalents, Fair Value Disclosure
Derivative liability
Derivative Liability
Class of Stock [Line Items]
Class of Stock [Line Items]
Income taxes at statutory rate
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount
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.
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]
Crop Insurance Contract, Crop Year [Axis]
Crop Insurance Contracts, Crop Year [Axis]
Crop Insurance Contracts, Crop Year
Investments accounted for using the equity method
Equity Method Investments
Subordinated Debt Obligations
Subordinated Debt Obligations [Member]
Financial Instrument [Axis]
Financial Instrument [Axis]
Proceeds from:
Proceeds from Investing Activities [Abstract]
Retained earnings
Retained Earnings, Unappropriated
Other assets
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets
Insurance Loss Reserves [Abstract]
Insurance Loss Reserves [Abstract]
Total Shareholder Return Amount
Total Shareholder Return Amount
Repurchases of Common Stock
Payments for Repurchase of Common Stock
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Adjustment To PEO Compensation, Footnote
Adjustment To PEO Compensation, Footnote [Text Block]
Statement of Cash Flows
Statement of Cash Flows [Policy Text Block]
Describes an entity's accounting policy related to the statement of cash flows.
Acquisition of Business
Mergers, Acquisitions and Dispositions Disclosures [Text Block]
Tax effects
Tax Effects [Member]
Tax effects.
Total pension and OPRP adjustments, tax
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax
Total
Parent [Member]
Segments [Domain]
Segments [Domain]
Fair Value Hierarchy and NAV [Axis]
Fair Value Hierarchy and NAV [Axis]
Restricted stock awards (shares)
Restricted Common Stock, shares issued (shares)
Stock Issued During Period, Shares, Restricted Stock Award, Gross
Insurance
Insurance Disclosure [Text Block]
Net purchases of trading securities
Proceeds from (Payments for) Trading Securities, Short-Term
Transfer into Level 3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3
Net decrease in the provision for claims of prior years
Prior Year Claims and Claims Adjustment Expense
Deferred Policy Acquisition Costs (“DPAC”)
Deferred Policy Acquisition Costs, Policy [Policy Text Block]
Entity Address, State or Province
Entity Address, State or Province
Compensation Actually Paid vs. Total Shareholder Return
Compensation Actually Paid vs. Total Shareholder Return [Text Block]
Percentage (based on fair value) of available for sale fixed maturities that are in an 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.
Operating Activities:
Net Cash Provided by (Used in) Operating Activities [Abstract]
Residential MBS
Residential MBS
Residential Mortgage-Backed Securities [Member]
Fixed maturities without single maturity date
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
Maturities and redemptions of fixed maturities
Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale
Number of collateralized loan obligation entities formed during the period
Number Of Collateralized Loan Obligation Entities Formed During The Period
Number of collateralized loan obligation entities formed during the period.
Earnings per Common Share:
Earnings Per Share, Basic [Abstract]
Other receivables
Other Receivables
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Fair Value by Asset Class [Domain]
Asset Class [Domain]
Effect of other income tax reconciliation as a percentage of EBT
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent
Reclassification adjustment for realized (gains) losses included in net earnings, tax
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax
Class of Stock [Domain]
Class of Stock [Domain]
Provision for income taxes as shown on the Statement of Earnings as a percentage of EBT
Effective Income Tax Rate Reconciliation, Percent
Operating lease liability
Operating Lease, Liability
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.
Total pension and OPRP adjustments, pretax
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax
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
Total Shareholder Return Vs Peer Group
Total Shareholder Return Vs Peer Group [Text Block]
Accumulated Other Comp. Income Loss
AOCI attributable to parent
AOCI Attributable to Parent [Member]
Aggregate Erroneous Compensation Amount
Aggregate Erroneous Compensation Amount
All Executive Categories
All Executive Categories [Member]
Effect of other income
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount
Accumulated Other Comprehensive Income (Loss) [Table]
Accumulated Other Comprehensive Income (Loss) [Table]
Accumulated defined benefit plans adjustment attributable to parent
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Debt Disclosure [Abstract]
Debt Disclosure [Abstract]
Retirements of managed investment entities’ liabilities
Retirement Of Managed Investment Entities Liabilities
Retirement of managed investment entities' liabilities.
Provision (credit) for expected credit losses
Premium Receivable, Credit Loss Expense (Reversal)
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.
Special charge to increase asbestos and environmental reserves
Liability for Asbestos and Environmental Claims, Net, Period Increase (Decrease)
Number of segments
Number of Reportable Segments
Selected financial information related to collateralized loan obligations
Schedule of Variable Interest Entities [Table Text Block]
Common Stock, no par value — 200,000,000 shares authorized — 84,135,710 and 85,204,006 shares outstanding
Common Stock, Value, Issued
After one year through five years
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five
Senior Notes
Senior Notes [Member]
All Individuals
All Individuals [Member]
Entity Filer Category
Entity Filer Category
Non-PEO NEO Average Total Compensation Amount
Non-PEO NEO Average Total Compensation Amount
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
Percentage of level three assets that were priced using a discounted cash flow approach.
Statement [Table]
Statement [Table]
Subsegments [Domain]
Subsegments [Domain]
Current Fiscal Year End Date
Current Fiscal Year End Date
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
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]
PEO Name
PEO Name
Shares issued:
Shares Issued [Abstract]
Shares issued.
Fair Value, by Balance Sheet Grouping [Table]
Fair Value, by Balance Sheet Grouping [Table]
Crop Insurance Contracts, Crop Year [Domain]
Crop Insurance Contracts, Crop Year [Domain]
Crop Insurance Contracts, Crop Year [Domain]
Debt Issuance Costs
Debt, Policy [Policy Text Block]
Preferred Stock, shares authorized (shares)
Preferred Stock, Shares Authorized
Multifamily
Multifamily [Member]
Managed investment entities:
Managed Investments Entities [Abstract]
Managed investments entities.
Prepaid reinsurance premiums
Prepaid Reinsurance Premiums
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.
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)
Other investments
Payments to Acquire Other Investments
Other income
Other Income
Purchases
Amount Of Managed Investment Entities Liabilities Purchased During the Period
Amount of managed investment entities liabilities purchased during the period
Unpaid Losses and Loss Adjustment Expenses
Unpaid Policy Claims and Claims Adjustment Expense, Policy [Policy Text Block]
Interest rate on debt instruments
Debt Instrument, Interest Rate, Stated Percentage
Level 3 assets that are equity securities that do not qualify for equity accounting
Level Three Assets, Equity Investments That Do Not Qualify for Equity Accounting
Level three assets, equity investments that do not qualify for equity accounting
Statement of Financial Position [Abstract]
Statement of Financial Position [Abstract]
Difference between aggregate unpaid principal balance and carrying value of CLOs' debt
Difference Between Aggregate Unpaid Principal Balance And Fair Value Of Variable Interest Entity Debt
Difference between aggregate unpaid principal balance and fair value of variable interest entity debt.
Change in unrealized
Change In Unrealized Appreciation Depreciation
Change in unrealized appreciation depreciation.
Deferred tax asset acquired
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets
Total shareholders’ equity
Equity, Attributable to Parent
Restricted Stock
Restricted Stock [Member]
Finite-Lived Intangible Assets, Major Class Name [Domain]
Finite-Lived Intangible Assets, Major Class Name [Domain]
Schedule of Stock by Class [Table]
Schedule of Stock by Class [Table]
Net unrealized gains (losses) on securities:
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax [Abstract]
Realized — impairments
Other-than-temporary Impairment Loss, Debt Securities, Available-for-Sale, Recognized in Earnings
Long-term Debt, Fiscal Year Maturity [Abstract]
Long-Term Debt, Fiscal Year Maturity [Abstract]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Not designated as hedging instrument
Not Designated as Hedging Instrument [Member]
States, municipalities and political subdivisions
State and municipal
US States and Political Subdivisions Debt Securities [Member]
Hedging Designation [Domain]
Hedging Designation [Domain]
Level 2
Fair Value, Inputs, Level 2 [Member]
Provision for losses and LAE occurring in the current period
Current Year Claims and Claims Adjustment Expense
Equity securities
Payments to Acquire Equity Securities, FV-NI
Property and casualty insurance:
Property And Casualty Insurance [Abstract]
Property And Casualty Insurance
Net tangible assets acquired, at fair value
Net tangible assets acquired, at fair value
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net
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]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Named Executive Officers, Footnote
Named Executive Officers, Footnote [Text Block]
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.
Document Fiscal Period Focus
Document Fiscal Period Focus
Finite-lived intangible assets useful life
Finite-Lived Intangible Asset, Useful Life
Stock Incentive Plan
Share-Based Payment Arrangement [Member]
Amount of debt repurchased
Debt Instrument, Repurchase Amount
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]
City Area Code
City Area Code
Document Fiscal Year Focus
Document Fiscal Year Focus
Change in fair value
Change in Fair Value of Ownership of Managed Investment Entities Liabilities
Change in fair value of ownership of managed investment entities liabilities
Assets of MIE
Assets of Managed Investment Entities [Member]
Assets of managed investment entities.
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
Expenses of managed investment entities
Expenses of Managed Investment Entities
Expenses of managed investment entities.
Exercise Price
Award Exercise Price
Finite-Lived Intangible Assets by Major Class [Axis]
Finite-Lived Intangible Assets by Major Class [Axis]
Derivatives not designated as hedges, gains (losses) included in net earnings
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net
Dividends
Dividends, Common Stock, Cash
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets Disclosure [Abstract]
Change in Fair Value [Axis]
Change in Fair Value [Axis]
Change in fair value
Total liabilities accounted for at fair value
Liabilities, Fair Value Disclosure
The scheduled maturities of available for sale fixed maturities
Available-for-Sale Securities, Debt Maturities [Abstract]
Operating lease, right-of-use asset, Statement of Financial Position
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]
Liabilities acquired:
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Net unrealized gains (losses) on cash flow hedges:
Summary of Cash Flow Hedge Activity [Abstract]
Total liabilities and shareholders’ equity
Liabilities and Equity
Fixed maturities, available for sale, amortized cost
Debt Securities, Available-for-Sale, Amortized Cost
Peer Group Total Shareholder Return Amount
Peer Group Total Shareholder Return Amount
Operating lease right-of-use asset
Operating Lease, Right-of-Use Asset
Schedule of Long-term Debt Instruments [Table]
Schedule of Long-Term Debt Instruments [Table]
Equity Valuation Assumption Difference, Footnote
Equity Valuation Assumption Difference, Footnote [Text Block]
5.125% Subordinated Debentures due December 2059
Subordinated Debentures due in December 2059 [Member]
Subordinated Debentures due in December 2059
Insurance Agency
Insurance Agency [Member]
Insurance Agency
Arrangement Duration
Trading Arrangement Duration
Investment expenses
Investment Income, Investment Expense
Entity Address, City or Town
Entity Address, City or Town
Award Timing MNPI Considered
Award Timing MNPI Considered [Flag]
Segment reporting information, by segment
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Fixed maturities without single maturity date
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Amortized Cost
Fair Value Measurements
Fair Value of Financial Instruments, Policy [Policy Text Block]
Derivative Instruments and Hedging Activities Disclosures [Table]
Derivative Instruments and Hedging Activities Disclosures [Table]
Termination Date
Trading Arrangement Termination Date
Acquisition expenses incurred
Business Acquisition, Transaction Costs
Common Stock, shares authorized (shares)
Common Stock, Shares Authorized
Fixed maturities, available for sale at fair value (amortized cost — $10,610 and $10,736; allowance for expected credit losses of $20 and $11)
Available for sale (AFS) fixed maturities
Debt Securities, Available-for-Sale
Fixed maturities, available for sale, gross unrealized, gains
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax
Change in fair value of equity securities
Equity Securities, FV-NI, Gain (Loss)
Available for sale securities in a continuous unrealized loss position
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
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.
Adjustments:
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Award Timing Disclosures [Line Items]
Mortgage loans
Mortgage Loans on Real Estate, Commercial and Consumer, Net
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.
Total tangible assets acquired
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets
After five years through ten years
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10
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
Income Taxes
Income Tax, Policy [Policy Text Block]
Level 3 assets as a percentage of total assets measured at fair value
Level Three Assets As Percentage Of Assets Measured At Fair Value
Level three assets as a percentage of assets measured at fair value
Structured securities
Structured Securities [Member]
Structure securities such as mortgage back securities, collateralized loan obligations and other asset-backed securities
Insider Trading Arrangements [Line Items]
Accumulated Other Comprehensive Income [Roll Forward]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Provision for expected credit losses on securities with no previous allowance
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Not Previously Recorded
Entity Registrant Name
Entity Registrant Name
Material Terms of Trading Arrangement
Material Terms of Trading Arrangement [Text Block]
Award Timing Method
Award Timing Method [Text Block]
Other assets
Increase (Decrease) in Other Operating Assets
Effect of foreign operations as a percentage of EBT
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent
Debt Securities, Available-for-sale, Allowance for Credit Loss [Table]
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Table]
Adjustment to Compensation, Amount
Adjustment to Compensation Amount
Change in fair value of contingent consideration liability
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability
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
Compensation Actually Paid vs. Net Income
Compensation Actually Paid vs. Net Income [Text Block]
Peer Group Issuers, Footnote
Peer Group Issuers, Footnote [Text Block]
Assets and liabilities measured at fair value
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Other
Corporate and Other [Member]
Reductions of long-term debt
Reductions of long-term debt
Repayments of Long-Term Debt
Entity Central Index Key
Entity Central Index Key
Liabilities:
Liabilities, Fair Value Disclosure [Abstract]
Total realized/unrealized gains (losses) included in Net income
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings
Compensation expense related to stock incentive plans
Share-Based Payment Arrangement, Expense
Non-Rule 10b5-1 Arrangement Terminated
Non-Rule 10b5-1 Arrangement Terminated [Flag]
Effect of nondeductible expenses as a percentage of EBT
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent
Insurance claims and reserves
Increase (Decrease) in Liability for Claims and Claims Adjustment Expense Reserve
Name
Trading Arrangement, Individual Name
Other comprehensive loss
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
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.
Additions (reductions) 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)
Effect of foreign operations
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount
Long-term Debt, Type [Axis]
Long-Term Debt, Type [Axis]
Amendment Flag
Amendment Flag
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
One year or less
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One
Assets:
Assets, Fair Value Disclosure [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.
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]
Percentage of level 3 assets that were priced by pricing services
Percentage Of Level Three Assets That Were Priced By Pricing Services
Percentage Of Level Three Assets That Were Priced By Pricing Services
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]
Diluted (shares)
Weighted Average Number of Shares Outstanding, Diluted
Forgone Recovery, Explanation of Impracticability
Forgone Recovery, Explanation of Impracticability [Text Block]
Reinsurance
Reinsurance Accounting Policy [Policy Text Block]
Gross losses
Debt Securities, Available-for-Sale, Realized Loss
Company Selected Measure Amount
Company Selected Measure Amount
Total assets
Total assets
Assets
Name
Awards Close in Time to MNPI Disclosures, Individual Name
Unpaid losses and loss adjustment expenses
Balance at beginning of year
Gross unpaid losses and LAE included in the balance sheet at end of period
Liability for Claims and Claims Adjustment Expense, Property-Casualty Liability
Stock-based compensation expense
APIC, Share-Based Payment Arrangement, Increase for Cost Recognition
Scheduled principal payments on debt in year five
Long-Term Debt, Maturity, Year Five
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.
Non-NEOs
Non-NEOs [Member]
Voting Preferred Stock
Voting Preferred Stock [Member]
Voting preferred stock.
CLO earnings (losses) attributable to AFG
Earnings Losses Of Variable Interest Entities Attributable To Shareholders
Earnings (losses) of variable interest entities attributable to AFG shareholders.
Recoverables from reinsurers
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Financing Activities:
Net Cash Provided by (Used in) Financing Activities [Abstract]
Investment income
Gross Investment Income, Operating
Non-PEO NEO
Non-PEO NEO [Member]
Adjustment to Compensation:
Adjustment to Compensation [Axis]
Equity securities, at cost
Equity Securities, FV-NI, Cost
Other
Other Long-Term Investments [Member]
Issuances of managed investment entities’ liabilities
Proceeds From Issuance Of Managed Investment Entities
Proceeds from issuance of managed investment entities
Debt Instrument [Line Items]
Debt Instrument [Line Items]
Basic (shares)
Weighted Average Number of Shares Outstanding, Basic
Revenues:
Revenues [Abstract]
Forfeitures of restricted stock (shares)
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited
Pay vs Performance Disclosure
Pay vs Performance Disclosure [Table]
Statement [Line Items]
Statement [Line Items]
Change in fair value
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.
Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost, Fiscal Year Maturity [Abstract]
AFG's internal investment professionals
Number Of Internal Investment Professionals
Number of internal investment professionals.
Effect of prior year income taxes as a percentage of EBT
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Percent