Trading Arrangements, by Individual
Trading Arrangements, by Individual [Table]
Real estate-related investments
Equity Method Investments, Real Estate-related Investments [Member]
Equity Method Investments, Real Estate-related Investments
Average number of Common Shares:
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Trading Arrangement:
Trading Arrangement [Axis]
Maximum
Maximum
Maximum [Member]
Total net unrealized gains (losses) on securities, tax
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, Tax
Portion at fair value measurement
Portion at Fair Value Measurement [Member]
Distributions
Proceeds Received From Distributions of Managed Investment Entities Liabilities
Proceeds received from distributions of managed investment entities liabilities.
Statistical Measurement [Domain]
Statistical Measurement [Domain]
Title of 12(b) Security
Title of 12(b) Security
Debt Securities, Available-for-sale [Table]
Debt Securities, Available-for-Sale [Table]
Carrying Value
Reported Value Measurement [Member]
Document Fiscal Year Focus
Document Fiscal Year Focus
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
Adjustment to Compensation, Amount
Adjustment to Compensation Amount
Assets of managed investment entities
Variable Interest Entity, Assets
Variable Interest Entity, Assets
Financial Instrument [Axis]
Financial Instrument [Axis]
Segment Reporting [Abstract]
Segment Reporting [Abstract]
Common Stock, no par value — 200,000,000 shares authorized — 82,916,648 and 83,422,202 shares outstanding
Common Stock, Value, Issued
Depreciation and amortization
Depreciation, Amortization and Accretion, Net
Interest charges on borrowed money
Interest Expense, Operating and Nonoperating
Schedule of long-term debt instruments
Schedule of Long-Term Debt Instruments [Table Text Block]
Net unrealized gains (losses) on securities:
Debt Securities, Unrealized Gain (Loss) [Abstract]
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
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
Restatement Determination Date
Restatement Determination Date
Derivative Instrument [Axis]
Derivative Instrument [Axis]
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
Payable to reinsurers
Reinsurance Payable
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]
U.S. government and government agencies
US Treasury and Government [Member]
Variable Interest Entity, Ownership [Roll Forward]
Variable Interest Entity, Ownership [Roll Forward]
Progression of the ownership of variable interest entities
Amendment Flag
Amendment Flag
Consolidated Entities [Axis]
Consolidated Entities [Axis]
Debt and Equity Securities, FV-NI [Line Items]
Debt and Equity Securities, FV-NI [Line Items]
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Purchases and issuances
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances
Collateral receivable supporting swaps
Derivative Liability, Not Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash
Receivable for collateral posted related to interest rate swap liabilities
Property and transportation
Specialty Property And Transportation Insurance [Member]
Specialty Property and transportation.
Net investment income
Net investment income
Net investment income
Net Investment Income
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Gross unrealized, losses
Gross unrealized losses on fixed maturities
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax
Other asset-backed securities
Other asset-backed securities
Asset-Backed Securities [Member]
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.
Investments [Domain]
Investments [Domain]
Private debt
Equity Method Investments, Private Debt Funds [Member]
Equity Method Investments, Private Debt Funds
Other comprehensive income (loss), net of tax:
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Amortized cost
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss
Consolidated Entities [Domain]
Consolidated Entities [Domain]
Total pension and OPRP adjustments, pretax
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax
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.
Adjustment to Non-PEO NEO Compensation Footnote
Adjustment to Non-PEO NEO Compensation Footnote [Text Block]
Transfer into Level 3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3
Entity Address, State or Province
Entity Address, State or Province
Equity securities
Payments to Acquire Equity Securities, FV-NI
Available for sale securities in a continuous unrealized loss position
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
PEO Total Compensation Amount
PEO Total Compensation Amount
The scheduled maturities of available for sale fixed maturities
Available-for-Sale Securities, Debt Maturities [Abstract]
Foreign currency translation adjustments
Foreign currency translation adjustments, after tax
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax
Assets:
Assets, Fair Value Disclosure [Abstract]
Derivative, notional amount
Derivative, Notional Amount
Basic (shares)
Weighted Average Number of Shares Outstanding, Basic
Outstanding Aggregate Erroneous Compensation Amount
Outstanding Aggregate Erroneous Compensation Amount
Fair Value, by Balance Sheet Grouping [Table]
Fair Value, by Balance Sheet Grouping [Table]
Number of segments
Number of Reportable Segments
4.50% Subordinated Debentures due September 2060
Subordinated Debentures due in September 2060 [Member]
Subordinated Debentures due in September 2060
Roll forward of allowance for credit losses on fixed maturity securities
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Table Text Block]
Investments:
Investments [Abstract]
After five years through ten years
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10
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.
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
Entity Address, City or Town
Entity Address, City or Town
Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost, Fiscal Year Maturity [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Management fees paid to AFG
Management Fees Paid by Variable Interest Entities
Management fees paid by variable interest entities.
Statement of Financial Position [Abstract]
Statement of Financial Position [Abstract]
Shares exchanged — benefit plans (shares)
Stock Repurchased Shares Exchanged in Stock Compensation Plans, Shares
Repurchased shares exchanged in stock compensation plans, shares
Award Timing MNPI Disclosure
Award Timing MNPI Disclosure [Text Block]
Basis of Presentation
Basis of Accounting, Policy [Policy Text Block]
Class of Stock [Axis]
Class of Stock [Axis]
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.
Amortizable intangible assets related to property and casualty insurance acquisitions
Intangible Asset, Finite-Lived, after Accumulated Amortization
Peer Group Total Shareholder Return Amount
Peer Group Total Shareholder Return Amount
Other lines
Other Lines [Member]
Other lines.
Dividend reinvestment plan
Stock Issued During Period, Value, Dividend Reinvestment Plan
Accumulated amortization
Intangible Asset, Finite-Lived, Accumulated Amortization
Level 2
Fair Value, Inputs, Level 2 [Member]
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
Total Shareholder Return Vs Peer Group
Total Shareholder Return Vs Peer Group [Text Block]
Revolving credit line
Line of Credit Facility, Maximum Borrowing Capacity
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.
Other comprehensive income (loss), net of tax
Other Comprehensive Income (Loss), Net of Tax
Non-Rule 10b5-1 Arrangement Terminated
Non-Rule 10b5-1 Arrangement Terminated [Flag]
Provision (credit) for expected credit losses
Reinsurance Recoverable, Credit Loss Expense (Reversal)
Purchases of:
Payment for Investing Activity [Abstract]
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.
Allowance for Credit Losses [Roll Forward]
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Effect of income tax credits as a percentage of EBT
Effective Income Tax Rate Reconciliation, Tax Credit, Percent
AFG
Parent Company [Member]
Variable interest rate on debt instrument
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]
Insurance Loss Reserves [Abstract]
Insurance Loss Reserves [Abstract]
Restricted stock awards (shares)
Restricted Common Stock, shares issued (shares)
Stock Issued During Period, Shares, Restricted Stock Award, Gross
Total net unrealized gains (losses) on cash flow hedges
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax
Schedule of Long-term Debt Instruments [Table]
Schedule of Long-Term Debt Instruments [Table]
Investment expenses
Investment Income, Investment Expense
Schedule of Investment Income, Reported Amounts, by Category [Table]
Investment Income [Table]
Provision (credit) for expected credit losses
Premium Receivable, Credit Loss Expense (Reversal)
Contingent consideration — acquisitions
Contingent Consideration - Acquisitions [Member]
Contingent consideration of acquisitions.
Earnings Per Share
Earnings Per Share, Policy [Policy Text Block]
Transfer into Level 3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3
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
Segment reporting information, by segment
Segment Reporting [Table Text Block]
Purchases of investments
Purchases of Investments by Managed Investment Entities
The cash outflow from the purchase of investments by managed investment entities.
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.
Total pension and OPRP adjustments, tax
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax
Other comprehensive income (loss)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Changes in balances of Level 3 financial liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
Other comprehensive income (loss), pretax
Other Comprehensive Income (Loss), before Tax
Dividend reinvestment plan (shares)
Stock Issued During Period, Shares, Dividend Reinvestment Plan
Long-term debt
Carrying Value
Long-Term Debt
After one year through five years
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five
Document Period End Date
Document Period End Date
Change in:
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract]
Net cash provided by (used in) investing activities
Cash Provided by (Used in) Investing Activity, Including Discontinued Operation
Equity Awards Adjustments, Excluding Value Reported in Compensation Table
Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member]
Shareholders' Equity
Equity [Text Block]
Earnings per Common Share:
Earnings Per Share, Basic [Abstract]
Security Exchange Name
Security Exchange Name
Gross losses
Debt Securities, Available-for-Sale, Realized Loss
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.
Insurance
Insurance Disclosure [Text Block]
Unrealized holding gains (losses) on securities arising during the period, tax
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax
After ten years
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10
Payable to reinsurers
Increase (Decrease) in Reinsurance Payables
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.
Total liabilities accounted for at fair value
Total financial liabilities not accounted for at fair value
Liabilities, Fair Value Disclosure
Accumulated other comprehensive income (loss), net of tax
Accumulated Other Comprehensive Income (Loss), Net of Tax
Entity Shell Company
Entity Shell Company
Consolidation Items [Domain]
Consolidation Items [Domain]
Property and casualty insurance
Property and Casualty Insurance [Member]
Property and casualty insurance.
Total realized/unrealized gains (losses) included in Net income
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings
Effect of other income tax reconciliation adjustments
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount
Fair Value - twelve months or more
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer
Segments of Operations
Segment Reporting, Policy [Policy Text Block]
Mortgage loans
Payments to Acquire Mortgage Notes Receivable
Mortgage loans
Mortgages [Member]
Statement of Comprehensive Income [Abstract]
Statement of Comprehensive Income [Abstract]
Name
Outstanding Recovery, Individual Name
Reclassification adjustment for realized (gains) losses included in net earnings, tax
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax
Award Timing, How MNPI Considered
Award Timing, How MNPI Considered [Text Block]
Document Fiscal Period Focus
Document Fiscal Period Focus
Peer Group Issuers, Footnote
Peer Group Issuers, Footnote [Text Block]
Total liabilities
Liabilities
Trading Symbol
Trading Symbol
Managed Investment Entities
Consolidation, Variable Interest Entity, Policy [Policy Text Block]
Transfer out of Level 3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3
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]
Pension Adjustments Prior Service Cost
Pension Adjustments Prior Service Cost [Member]
Company Selected Measure Name
Company Selected Measure Name
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)
Fixed maturities
Payments to Acquire Debt Securities, Available-for-Sale
Schedule of Investments [Table]
Schedule of Investments [Table]
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Abstract]
Total net unrealized gains (losses) on securities
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax
Other investments
Payments to Acquire Other Investments
Accumulated defined benefit plans adjustment attributable to parent
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Internally developed level 3 assets
Internally Developed Level 3 Assets
Level 3 assets in which the fair value was developed internally.
Principal
Long-Term Debt, Gross
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
Actual Cost
Equity Securities, FV-NI, Cost
Fair Value by Asset Class [Domain]
Asset Class [Domain]
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
Operating Activities:
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract]
Debt Issuance Costs
Debt, Policy [Policy Text Block]
Compensation Amount
Outstanding Recovery Compensation Amount
Individual:
Individual [Axis]
Diluted (shares)
Weighted Average Number of Shares Outstanding, Diluted
Entity Emerging Growth Company
Entity Emerging Growth Company
Equity Valuation Assumption Difference, Footnote
Equity Valuation Assumption Difference, Footnote [Text Block]
Disposal Group Name [Domain]
Disposal Group Name [Domain]
Derivatives
Derivatives, Policy [Policy Text Block]
Transfer out of Level 3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3
Underlying Security Market Price Change
Underlying Security Market Price Change, Percent
Net investment income earned and investment expenses incurred
Investment Income [Table Text Block]
Derivatives
Derivative Instruments and Hedging Activities Disclosure [Text Block]
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)
5.625% Subordinated Debentures due June 2060
Subordinated Debentures Due In June 2060 [Member]
Subordinated Debentures Due In June 2060
Entities [Table]
Entities [Table]
Net Unrealized
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain (Loss), before Tax
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table]
Operating lease liability, current, Statement of Financial Position
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]
Investment in CLO tranches
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount
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.
Changes in balances of Level 3 financial assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
Other receivables
Other Receivables
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.
Fixed maturities without single maturity date
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Amortized Cost
Award Timing Predetermined
Award Timing Predetermined [Flag]
Intangible Asset, Goodwill and Other [Abstract]
Intangible Asset, Goodwill and Other [Abstract]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-Sale [Line Items]
Adjustment To PEO Compensation, Footnote
Adjustment To PEO Compensation, Footnote [Text Block]
Stock-based compensation expense
APIC, Share-Based Payment Arrangement, Increase for Cost Recognition
Losses and loss adjustment expenses
Policyholder Benefits and Claims Incurred, Net
Level 1
Fair Value, Inputs, Level 1 [Member]
Net liability at beginning of year
Net liability at end of period
Liability for Unpaid Claims and Claims Adjustment Expense, Net
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.
Effect of income tax credits
Effective Income Tax Rate Reconciliation, Tax Credit, Amount
5.25% Senior Notes due April 2030
Senior Notes Due In April 2030 [Member]
Senior Notes due in April 2030
Provision for income taxes as shown on the Statement of Earnings as a percentage of EBT
Effective Income Tax Rate Reconciliation, Percent
Changes in the goodwill
Goodwill, Period Increase (Decrease)
Fair value, total, percent
Available For Sale Securities Debt Maturities Fair Value Percent
Available-for-sale Securities, Debt Maturities, Fair Value, Total, Percent.
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.
Fair Value Measurements
Fair Value of Financial Instruments, Policy [Policy Text Block]
Weighted average common shares adjustment related to stock-based compensation (shares)
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements
Premium Recognition
Insurance Premiums Revenue Recognition, Policy [Policy Text Block]
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.
All Executive Categories
All Executive Categories [Member]
Shares acquired and retired
Stock Repurchased and Retired During Period, Value
Pension Adjustments Service Cost
Pension Adjustments Service Cost [Member]
Residential MBS
Residential MBS
Residential Mortgage-Backed Securities [Member]
Realized gains (losses) on securities before impairments
Marketable Security, Realized Gain (Loss)
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
Operating lease right-of-use asset
Operating Lease, Right-of-Use Asset
Subordinated debt obligations
Subordinated Debt Obligations [Member]
Payments for losses and LAE of:
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
One year or less
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One
Derivative Liability, Statement of Financial Position [Extensible Enumeration]
Derivative Liability, Statement of Financial Position [Extensible Enumeration]
Fair Value Disclosures [Abstract]
Fair Value Disclosures [Abstract]
5.00% Senior Notes due September 2035
Senior Notes Due In September 2035 [Member]
Senior Notes Due In September 2035
Debt Disclosure [Abstract]
Debt Disclosure [Abstract]
Debt Instrument, Name [Domain]
Debt Instrument, Name [Domain]
Recoverables from reinsurers
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments
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.
Other benefit plans
Stock Issued During Period, Value, Employee Benefit Plan
Investments
Investment in Debt and Equity Securities and Other Trading Assets [Text Block]
Segments of Operations
Segment Reporting [Text Block]
Maturities and redemptions of fixed maturities
Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale
Amount borrowed under revolving credit facility
Long-Term Line of Credit
Minimum
Minimum [Member]
Sales
Proceeds Received Related to Sales of Managed Investment Entities Liabilities
Proceeds received related to sales of managed investment entities liabilities during the period
Investment Type [Axis]
Investment Type [Axis]
Cash dividends paid on Common Stock
Payments of Ordinary Dividends, Common Stock
Expiration Date
Trading Arrangement Expiration Date
Net of tax
Net of tax [Member]
Net of tax
Scheduled principal payments on debt in year four
Long-Term Debt, Maturity, Year Four
Managed by third parties
Managed by Third Parties [Member]
Managed by third parties
Hedging Relationship [Axis]
Hedging Relationship [Axis]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Income Statement Location [Axis]
Location, Statement of Income, Balance [Axis]
Non-Rule 10b5-1 Arrangement Adopted
Non-Rule 10b5-1 Arrangement Adopted [Flag]
Cash and cash equivalents
Cash and Cash Equivalents, Fair Value Disclosure
Goodwill
Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]
Beginning Balance
Ending Balance
Equity, Including Portion Attributable to Noncontrolling Interest
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]
Subordinated Debentures
Subordinated Debt [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Other liabilities
Other liabilities - derivatives
Other Liabilities
Aggregate Pension Adjustments Service Cost
Aggregate Pension Adjustments Service Cost [Member]
Issuances of Common Stock
Proceeds from Issuance of Common Stock
Common Stock, shares authorized (shares)
Common Stock, Shares Authorized
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Common Stock, par value (USD per share)
Common Stock, No Par Value
Gross gains
Debt Securities, Available-for-Sale, Realized Gain
After ten years
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10
Exercise Price
Award Exercise Price
Investing Activities:
Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract]
Change in fair value of fixed maturities
Debt Securities, Trading and Convertible, Change in Fair Value
The change in fair value of debt securities classified as trading or derivatives embedded in convertible fixed maturities.
Segment Reporting [Line Items]
Segment Reporting [Line Items]
Nonvoting Preferred Stock
Nonvoting Preferred Stock [Member]
Nonvoting preferred stock.
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
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 Quarterly Report
Document Quarterly Report
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]
Segments [Domain]
Segments [Domain]
Interest rate swaps
Interest Rate Swap [Member]
States, municipalities and political subdivisions
State and municipal
US States and Political Subdivisions Debt Securities [Member]
Common Stock and Capital Surplus
Common Stock Including Additional Paid in Capital [Member]
Sales of fixed maturities
Proceeds from Sale of Debt Securities, Available-for-Sale
Prior years
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years
Equity securities reported at fair value
Marketable Securities [Table Text Block]
Discount and Issue Costs
Debt Issuance Costs, Net
Retained earnings
Retained Earnings, Unappropriated
Awards Close in Time to MNPI Disclosures, Table
Awards Close in Time to MNPI Disclosures [Table Text Block]
Investments accounted for using the equity method
Equity Method Investments
Equity Component [Domain]
Equity Component [Domain]
PEO Actually Paid Compensation Amount
PEO Actually Paid Compensation Amount
Total realized/unrealized gains (losses) included in net earnings (loss)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings
Repayments of mortgage loans
Proceeds from Sale and Collection of Mortgage Notes Receivable
Costs and Expenses:
Benefits, Losses and Expenses [Abstract]
Fair Value, Fiscal Year Maturity [Abstract]
Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract]
Statement of Cash Flows
Statement of Cash Flows [Policy Text Block]
Describes an entity's accounting policy related to the statement of cash flows.
Adoption Date
Trading Arrangement Adoption Date
Scheduled principal payments on debt thereafter
Long-Term Debt, Maturity, after Year Five
Total tax effects
Tax Effects [Member]
Tax effects.
Beginning Balance
Ending Balance
Premium Receivable, Allowance for Credit Loss
Interest rate on debt instruments
Debt Instrument, Interest Rate, Stated Percentage
Dividends
Dividends, Common Stock, Cash
Total shareholders’ equity
Equity, Attributable to Parent
Real Estate [Domain]
Real Estate [Domain]
Equity securities, at fair value
Equity Securities, FV-NI, Current
Assets:
Assets [Abstract]
Title
Trading Arrangement, Individual Title
Forgone Recovery due to Disqualification of Tax Benefits, Amount
Forgone Recovery due to Disqualification of Tax Benefits, 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
Real estate and other investments
Other Investments
Accounting Policies [Abstract]
Accounting Policies [Abstract]
Fixed maturities, available for sale, amortized cost
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost
Restatement does not require Recovery
Restatement Does Not Require Recovery [Text Block]
Operating lease liability
Operating Lease, Liability
Insider Trading Policies and Procedures [Line Items]
Insider Trading Policies and Procedures Adopted
Insider Trading Policies and Procedures Adopted [Flag]
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.
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.
Sales of other investments
Proceeds from Sale and Maturity of Other Investments
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Commissions and other underwriting expenses
Selling, General and Administrative Expense
Investment income
Investment Income of Managed Investment Entities
Investment income of managed investment entities.
Current year
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year
Total losses and LAE incurred
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims
Effect of other nondeductible items
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount
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
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.
Liabilities of managed investment entities
Variable Interest Entity, Liabilities
Variable Interest Entity, Liabilities
Contingencies
Commitments and Contingencies Disclosure [Text Block]
Compensation Actually Paid vs. Net Income
Compensation Actually Paid vs. Net Income [Text Block]
Anti-dilutive potential common shares related to stock-based compensation plans (shares)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Entity Central Index Key
Entity Central Index Key
Capital surplus
Additional Paid in Capital, Common Stock
All Adjustments to Compensation
All Adjustments to Compensation [Member]
Other operating activities, net
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Other Item
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]
Income Taxes
Income Tax, Policy [Policy Text Block]
Net cash provided by operating activities
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation
Income taxes at statutory rate
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount
Net decrease in the provision for claims of prior years
Prior Year Claims and Claims Adjustment Expense
Scheduled principal payments on debt remainder of fiscal year
Long-Term Debt, Maturity, Remainder of Fiscal Year
Income Statement [Abstract]
Income Statement [Abstract]
Shareholders’ equity:
Equity, Attributable to Parent [Abstract]
Document Transition Report
Document Transition Report
Schedule of Investments [Line Items]
Schedule of Investments [Line Items]
Fair Value Hierarchy and NAV [Axis]
Fair Value Hierarchy and NAV [Axis]
Investment, Name [Axis]
Investment, Name [Axis]
Reinsurance
Reinsurance Accounting Policy [Policy Text Block]
Designated as hedging instrument
Designated as Hedging Instrument [Member]
Fixed maturities
Total fixed maturities
Fixed Maturities [Member]
Stock Appreciation Rights (SARs)
Stock Appreciation Rights (SARs) [Member]
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]
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.
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 revolving debt facility
Debt Instrument, Basis Spread on Variable Rate
City Area Code
City Area Code
Restricted Stock
Restricted Stock [Member]
Accumulated Other Comp. 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.
All Individuals
All Individuals [Member]
Name
Forgone Recovery, Individual Name
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Realized gains (losses) on securities
Realized gains (losses) on securities
Debt and Equity Securities, Realized Gain (Loss)
Non-GAAP Measure Description
Non-GAAP Measure Description [Text Block]
New collateralized loan obligation, temporary warehousing entities
New Collateralized Loan Obligation Temporary Warehousing Entities [Member]
New collateralized loan obligation temporary warehousing entities
Statement [Line Items]
Statement [Line Items]
Total assets
Total assets
Assets
Retirements of managed investment entities’ liabilities
Retirement Of Managed Investment Entities Liabilities
Retirement of managed investment entities' liabilities.
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
Interest and amortization
Gross Investment Income, Operating, Interest and Amortization
Interest and amortization included in investment income
Write-offs charged against the allowance
Premium Receivable, Allowance for Credit Loss, Writeoff
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.
Effective Income Tax Rate Reconciliation [Line Items]
Effective Income Tax Rate Reconciliation [Line Items]
Operating segments
Operating Segments [Member]
Stock-Based Compensation
Share-Based Payment Arrangement [Policy Text Block]
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
Gross unrealized, gains
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fixed maturities without single maturity date
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value
Other assets
Increase (Decrease) in Other Operating Assets
PEO
PEO [Member]
Scheduled principal payments on debt in year two
Long-Term Debt, Maturity, Year Two
Total cash and investments
Investments and Cash
Compensation expense related to stock incentive plans
Share-Based Payment Arrangement, Expense
Measurement Basis [Axis]
Measurement Basis [Axis]
Shares acquired and retired (shares)
Stock Repurchased and Retired During Period, Shares
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
Goodwill
Goodwill
Forgone Recovery due to Violation of Home Country Law, Amount
Forgone Recovery due to Violation of Home Country Law, Amount
Number of fixed maturity securities in an unrealized loss position
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions
Exercise of stock options (shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period
Fair value per share of restricted Common Stock issued under Stock Incentive Plan (USD per share)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value
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
Change in fair value of equity securities
Equity Securities, FV-NI, Gain (Loss)
One year or less
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One
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.
Retained Earnings
Retained Earnings [Member]
Accumulated net investment gain (loss) attributable to parent
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Erroneously Awarded Compensation Recovery
Erroneously Awarded Compensation Recovery [Table]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
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, shares outstanding (shares)
Beginning Balance (shares)
Ending Balance (shares)
Common Stock, Shares, Outstanding
Award Timing Disclosures [Line Items]
Accumulated foreign currency adjustment attributable to parent
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Fair value of financial instruments
Fair Value, by Balance Sheet Grouping [Table Text Block]
Shares issued:
Shares Issued [Abstract]
Shares issued.
Corporate and other
Corporate and other
Corporate Debt Securities [Member]
Total diluted earnings (USD per share)
Earnings Per Share, Diluted
Foreign currency translation and other
Liability for Unpaid Claims and Claims Adjustment Expense, Foreign Currency Translation Gain (Loss)
Accumulated Other Comprehensive Income (Loss) [Table]
Accumulated Other Comprehensive Income (Loss) [Table]
Entity Current Reporting Status
Entity Current Reporting Status
Net cash used in financing activities
Cash Provided by (Used in) Financing Activity, Including Discontinued Operation
Total Shareholder Return Amount
Total Shareholder Return Amount
Managed investment entities:
Managed Investments Entities [Abstract]
Managed investments entities.
Total net unrealized gains (losses) on cash flow hedges, tax
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax
Cash flow hedging
Cash Flow Hedging [Member]
Liabilities:
Liabilities, Fair Value Disclosure [Abstract]
Amortization of intangible assets
Intangible Asset, Finite-Lived, Amortization Expense
Stockholders' Equity Note [Abstract]
Stockholders' Equity Note [Abstract]
Adjustments:
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract]
Scheduled principal payments on debt in year three
Long-Term Debt, Maturity, Year Three
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.
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.
Financing Activities:
Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract]
Effect of other income tax reconciliation adjustments as a percentage of EBT
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent
Purchases
Amount Of Managed Investment Entities Liabilities Purchased During the Period
Amount of managed investment entities liabilities purchased during the period
Net Investment Income [Line Items]
Net Investment Income [Line Items]
Financial Instruments [Domain]
Financial Instruments [Domain]
Prepaid reinsurance premiums
Prepaid Reinsurance Premiums
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.
Investments accounted for using the equity method
Equity Method Investments [Table Text Block]
Net unrealized gains (losses) on cash flow hedges:
Reclassification of Cash Flow Hedge Gain (Loss) [Abstract]
Change in unrealized
Change In Unrealized Appreciation Depreciation
Change in unrealized appreciation depreciation.
Financial assets:
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Derivative assets
Derivative Asset
Other income
Other Income
Number of collateralized loan obligation entities
Number of Collateralized Loan Obligation Entities
Number of collateralized loan obligation entities.
Exercise of stock options
Stock Issued During Period, Value, Stock Options Exercised
Equity Awards Adjustments, Footnote
Equity Awards Adjustments, Footnote [Text Block]
Goodwill and Other Intangibles
Intangible Asset and Goodwill [Text Block]
Underlying Securities
Award Underlying Securities Amount
Fair Value
Estimate of Fair Value Measurement [Member]
Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]
Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]
Subsegments [Domain]
Subsegments [Domain]
Sales and settlements
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales
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.
Derivative Asset, Statement of Financial Position [Extensible Enumeration]
Derivative Asset, Statement of Financial Position [Extensible Enumeration]
Write-offs charged against the allowance
Reinsurance, Loss on Uncollectible Accounts in Period, Amount
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.
Perpetual preferred stocks
Preferred Stock [Member]
Subsegments [Axis]
Subsegments [Axis]
Other investing activities, net
Payment for (Proceeds from) Other Investing Activity
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount
Net tax expense related to a pending state income tax examination regarding sale of subsidiary
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount
Total net unrealized gains (losses) on securities, pretax
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax
Segment Reporting [Table]
Segment Reporting [Table]
Effect of other nondeductible items as a percentage of EBT
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent
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.
Available for sale fixed maturities
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block]
Multifamily
Multifamily [Member]
Shares exchanged — benefit plans
Stock Repurchased Shares Exchanged in Stock Compensation Plans, Value
Stock repurchased, shares exchanged in stock compensation plans, value.
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure [Abstract]
All Trading Arrangements
All Trading Arrangements [Member]
Fair value - less than twelve months
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months
Financial liabilities, Beginning Balance
Financial liabilities, Ending Balance
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value
Other Performance Measure, Amount
Other Performance Measure, Amount
Award Timing MNPI Considered
Award Timing MNPI Considered [Flag]
Reclassification adjustment for investment income included in net earnings, tax
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax
Earnings before income taxes
Earnings before income taxes (“EBT”)
Operating Income (Loss)
Current Fiscal Year End Date
Current Fiscal Year End Date
Dividends
Investment Income, Dividend
Non-PEO NEO Average Total Compensation Amount
Non-PEO NEO Average Total Compensation Amount
Earnings before realized gains 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.
Foreign government
Debt Security, Government, Non-US [Member]
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]
Dividends (USD per share)
Common Stock, Dividends, Per Share, Declared
Entity File Number
Entity File Number
Rule 10b5-1 Arrangement Adopted
Rule 10b5-1 Arrangement Adopted [Flag]
Available for sale fixed maturity securities by contractual maturity date
Investments Classified by Contractual Maturity Date [Table Text Block]
Equity securities
Equity Securities [Member]
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.
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]
Reclassification adjustment for investment income included in net earnings, pretax
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax
Recovery of Erroneously Awarded Compensation Disclosure [Line Items]
Operating lease, right-of-use asset, Statement of Financial Position
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]
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]
Common Stock, shares issued (shares)
Common Stock, Shares, Issued
Measure:
Measure [Axis]
Assets and liabilities measured at fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Financial assets, Beginning Balance
Financial assets, Ending Balance
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value
Selected financial information related to collateralized loan obligations
Schedule of Variable Interest Entities [Table Text Block]
Entity Information [Line Items]
Entity Information [Line Items]
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.
Net earned premiums
Premiums Earned, Net
Fixed maturities, available for sale, allowance for expected credit losses
Allowance for Expected Credit Losses
Beginning balance
Ending balance
Debt Securities, Available-for-Sale, Allowance for Credit Loss
Selected financial information related to collateralized loan obligations
Financial Information Related to Collateralized Loan Obligations [Abstract]
Financial information related to collateralized loan obligations.
Unrealized Loss - twelve months or more
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss
Statement, Equity Components [Axis]
Equity Components [Axis]
Equity Components [Axis]
Other expenses
Other Cost and Expense, Operating
Assets of MIE
Assets of Managed Investment Entities [Member]
Assets of managed investment entities.
Class of Stock [Line Items]
Class of Stock [Line Items]
Expenses of managed investment entities
Expenses of Managed Investment Entities
Expenses of managed investment entities.
Entity Interactive Data Current
Entity Interactive Data Current
Private equity
Equity Method Investments, Private Equity Funds [Member]
Equity Method Investments, Private Equity Funds
Variable Interest Entity [Line Items]
Variable Interest Entity [Line Items]
Compensation Actually Paid vs. Other Measure
Compensation Actually Paid vs. Other Measure [Text Block]
Derivatives not designated as hedges, gains (losses) included in net earnings
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net
After one year through five years
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five
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
Entity Small Business
Entity Small Business
New interest rate swaps entered during the period
New Interest Rate Swaps Entered During Period [Member]
New interest rate swaps entered during the period
Comprehensive income
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Unearned premiums
Unearned Premiums
Premium Receivable, Allowance for Credit Loss [Roll Forward]
Premium Receivable, Allowance for Credit Loss [Roll Forward]
Termination Date
Trading Arrangement Termination Date
Mortgage loans and other investments
Mortgage Loans And Other Investments [Member]
Mortgage loans and other investments.
Effective Income Tax Rate Reconciliation [Table]
Effective Income Tax Rate Reconciliation [Table]
Sales and settlements
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements
Fair Value, Recurring and Nonrecurring [Table]
Fair Value, Recurring and Nonrecurring [Table]
Income taxes at statutory rate as a percentage of EBT
Statutory rate of income taxes
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent
Compensation Actually Paid vs. Total Shareholder Return
Compensation Actually Paid vs. Total Shareholder Return [Text Block]
Total pension and OPRP adjustments, after Tax
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax
MNPI Disclosure Timed for Compensation Value
MNPI Disclosure Timed for Compensation Value [Flag]
Provision for losses and LAE occurring in the current period
Current Year Claims and Claims Adjustment Expense
Document Type
Document Type
Foreign currency translation adjustments, tax
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax
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]
Fair Value as of Grant Date
Award Grant Date Fair Value
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]
Accounting Policies
Significant Accounting Policies [Text Block]
Pay vs Performance Disclosure, Table
Pay vs Performance [Table Text Block]
Cash and cash equivalents
Cash and Cash Equivalents [Member]
Arrangement Duration
Trading Arrangement Duration
Statement of Stockholders' Equity [Abstract]
Statement of Stockholders' Equity [Abstract]
Debt Securities, Trading, and Equity Securities, FV-NI [Table]
Debt Securities, Trading, and Equity Securities, FV-NI [Table]
Local Phone Number
Local Phone Number
Consolidation Items [Axis]
Consolidation Items [Axis]
Entity Address, Postal Zip Code
Entity Address, Postal Zip Code
Entity Registrant Name
Entity Registrant Name
5.125% Subordinated Debentures due December 2059
Subordinated Debentures due in December 2059 [Member]
Subordinated Debentures due in December 2059
Total pretax
Pretax [Member]
Total Pretax.
Unrealized loss - less than twelve months
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss
Beginning Balance
Ending Balance
Reinsurance Recoverable, Allowance for Credit Loss
Insider Trading Policies and Procedures Not Adopted
Insider Trading Policies and Procedures Not Adopted [Text Block]
Total revenues
Revenues
Net unrealized gains (losses) on securities:
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax [Abstract]
Changed Peer Group, Footnote
Changed Peer Group, Footnote [Text Block]
Effect of tax preference investments
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount
Equity in earnings (losses) of partnerships and similar investments, net
Income (Loss) from Equity Method Investments
Proceeds from:
Proceeds from Investing Activity [Abstract]
Forgone Recovery due to Expense of Enforcement, Amount
Forgone Recovery due to Expense of Enforcement, Amount
Executive Category:
Executive Category [Axis]
Other comprehensive income (loss), tax
Other Comprehensive Income (Loss), Tax
Provision for expected credit losses on securities with no previous allowance
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Not Previously Recorded
Liabilities and Equity:
Liabilities and Equity [Abstract]
Assets and liabilities measured at fair value
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Subsidiary 1
Subsidiary 1 [Member]
Subsidiary 1
Award Type [Domain]
Award Type [Domain]
Non-PEO NEO Average Compensation Actually Paid Amount
Non-PEO NEO Average Compensation Actually Paid 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]
Fair Value Measurements
Fair Value Disclosures [Text Block]
Level 3
Fair Value, Inputs, Level 3 [Member]
Schedule of Variable Interest Entities [Table]
Variable Interest Entity [Table]
Impairment allowance on mortgage loans and other investments
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)
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
Deferred policy acquisition costs
Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Net
Trading fixed maturities
Trading Fixed Maturities [Member]
Trading fixed maturities
PEO Name
PEO Name
Total payments
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid
Net unrealized gains (losses) on cash flow hedges:
Summary of Cash Flow Hedge Activity [Abstract]
Accumulated gain (loss), net, cash flow hedge, parent
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Other assets
Other Assets
Stock Price or TSR Estimation Method
Stock Price or TSR Estimation Method [Text Block]
Maturities of short term investments
Maturity Period Of Short Term Investment Maximum
Maturity period of short term investment maximum.
Entity Tax Identification Number
Entity Tax Identification Number
Derivative Instruments and Hedging Activities Disclosures [Table]
Derivative Instruments and Hedging Activities Disclosures [Table]
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.
Impairment allowance on fixed maturity securities
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Period Increase (Decrease)
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
Number of collateralized loan obligation entities 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
Liability Class [Axis]
Liability Class [Axis]
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.
Cash and cash equivalents at beginning of period
Cash and cash equivalents at end of period
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation
Entity Incorporation, State or Country Code
Entity Incorporation, State or Country Code
Property and casualty insurance underwriting
Property and casualty insurance underwriting profit
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.
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.
Aggregate Erroneous Compensation Not Yet Determined
Aggregate Erroneous Compensation Not Yet Determined [Text Block]
Material Terms of Trading Arrangement
Material Terms of Trading Arrangement [Text Block]
Non-NEOs
Non-NEOs [Member]
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]
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
Debt Instrument [Axis]
Debt Instrument [Axis]
Credit Losses on Fixed Maturity Investments and Credit Losses on Financial Instruments Measured at Amortized Cost
Credit Loss, Financial Instrument [Policy Text Block]
Disposal Group Name [Axis]
Disposal Group Name [Axis]
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
Investment, Name [Domain]
Investment, Name [Domain]
Scheduled principal payments on debt in year one
Long-Term Debt, Maturity, Year One
Long-term Debt, Type [Domain]
Long-Term Debt, Type [Domain]
After five years through ten years
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10
Derivatives included in the Balance Sheet at fair value
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
Total basic earnings (USD per share)
Earnings Per Share, Basic
Repurchases of Common Stock
Payments for Repurchase of Common Stock
Residential mortgage-backed securities
Collateralized Mortgage-Backed Securities [Member]
Statistical Measurement [Axis]
Statistical Measurement [Axis]
Insider Trading Arrangements [Line Items]
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]
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
Award Type [Axis]
Award Type [Axis]
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
Specialty casualty
Specialty Casualty Insurance [Member]
Specialty casualty.
Named Executive Officers, Footnote
Named Executive Officers, Footnote [Text Block]
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]
Real Estate, Type of Property [Axis]
Real Estate, Type of Property [Axis]
Awards Close in Time to MNPI Disclosures
Awards Close in Time to MNPI Disclosures [Table]
Common Stock
Common Shares
Common stocks
Common Stock [Member]
Fixed maturities, available for sale at fair value (amortized cost — $11,425 and $11,101; allowance for expected credit losses of $25 and $21)
Available for sale (AFS) fixed maturities
Debt Securities, Available-for-Sale
Fair Value Measurement [Domain]
Fair Value Measurement [Domain]
Contingent consideration — acquisitions
Business Combination, Contingent Consideration, Liability
Compensation Actually Paid vs. Company Selected Measure
Compensation Actually Paid vs. Company Selected Measure [Text Block]
Cover [Abstract]
Cover [Abstract]
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
Insurance [Abstract]
Insurance [Abstract]
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
Derivative Contract [Domain]
Derivative Contract [Domain]
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward]
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward]
Equity Awards Adjustments
Equity Awards Adjustments [Member]
Hedging Relationship [Domain]
Hedging Relationship [Domain]
Other assets — derivatives
Derivative Financial Instruments, Assets [Member]
Total liabilities and shareholders’ equity
Liabilities and Equity
Realized gains on investing activities
Realized Investment Gains (Losses)
Employee Stock Option
Share-Based Payment Arrangement, Option [Member]
Purchases and issuances
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases
Reclassification from accumulated other comprehensive income
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Business Segments [Axis]
Segments [Axis]
Other liabilities
Increase (Decrease) in Other Operating Liabilities
Additional 402(v) Disclosure
Additional 402(v) Disclosure [Text Block]
Asset Class [Axis]
Asset Class [Axis]
5.875% Subordinated Debentures due March 2059
Subordinated Debentures Due In March 2059 [Member]
Subordinated Debentures Due In March 2059
Fixed maturities, trading at fair value
Trading fixed maturities
Debt Securities, Trading
Tabular List, Table
Tabular List [Table Text Block]
Less reinsurance recoverables, net of allowance
Add back reinsurance recoverables, net of allowance
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments
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.
Long-Term Debt
Long-Term Debt [Text Block]
Effect of tax preference investments as a percentage of EBT
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent
Total
Parent [Member]
Name
Awards Close in Time to MNPI Disclosures, Individual Name
Specialty financial
Specialty Financial Insurance [Member]
Specialty Financial.
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]
Fair Value by Liability Class [Domain]
Fair Value by Liability Class [Domain]
Other
Other Long-term Debt [Member]
Other Long-term Debt.
Gross realized gains and losses on available for sale fixed maturity and equity security investments
Schedule of Realized Gain (Loss) [Table Text Block]
Preferred Stock, shares authorized (shares)
Preferred Stock, Shares Authorized
Derivatives, Fair Value [Line Items]
Derivatives, Fair Value [Line Items]
Investment and other income, net
Investment and Other Income, Net
Net investment income plus other income less other expenses.
Adjustment to Compensation:
Adjustment to Compensation [Axis]
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.
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.
Hedging Designation [Domain]
Hedging Designation [Domain]
Other liabilities — derivatives
Derivative Financial Instruments, Liabilities [Member]
Class of Stock [Domain]
Class of Stock [Domain]
Rule 10b5-1 Arrangement Terminated
Rule 10b5-1 Arrangement Terminated [Flag]
Aggregate Erroneous Compensation Amount
Aggregate Erroneous Compensation Amount
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.
Statement of Cash Flows [Abstract]
Statement of Cash Flows [Abstract]
Net sales of trading securities
Proceeds from (Payments for) Trading Securities, Short-Term
Hedging Designation [Axis]
Hedging Designation [Axis]
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]
Aggregate Available
Trading Arrangement, Securities Aggregate Available Amount
Total assets accounted for at fair value
Total financial assets not accounted for at fair value
Assets, Fair Value Disclosure
Investments
Investment, Policy [Policy Text Block]
Name
Measure Name
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]
Income Taxes
Income Tax Disclosure [Text Block]
Foreign currency translation adjustments, pretax
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax
Pay vs Performance Disclosure [Line Items]
Fair Value, Measurements, Fair Value Hierarchy [Domain]
Fair Value Hierarchy and NAV [Domain]
Fair Value Over 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.
Other benefit plans (shares)
Stock Issued During Period, Shares, Employee Benefit Plan
Debt Instrument [Line Items]
Debt Instrument [Line Items]
Sales of equity securities
Proceeds from Sale of Equity Securities, FV-NI
Pay vs Performance Disclosure
Pay vs Performance Disclosure [Table]
Debt Securities, Available-for-sale, Allowance for Credit Loss [Table]
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Table]
Total net unrealized gains (losses) on cash flow hedges, pretax
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax
Other
Corporate Segment and Other Operating Segment [Member]
Insurance claims and reserves
Increase (Decrease) in Liability for Claims and Claims Adjustment Expense Reserve
Entity Filer Category
Entity Filer Category
Name
Trading Arrangement, Individual Name
Cash and cash equivalents
Cash and Cash Equivalent
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.
Long-term Debt, Fiscal Year Maturity [Abstract]
Long-Term Debt, Fiscal Year Maturity [Abstract]
Earnings (losses) on derivatives
Gain (Loss) on Derivative Instruments, Net, Pretax
Company Selected Measure Amount
Company Selected Measure Amount
Voting Preferred Stock
Voting Preferred Stock [Member]
Voting preferred stock.
Not designated as hedging instrument
Not Designated as Hedging Instrument [Member]
Holding gains (losses) on equity securities
Equity Securities, FV-NI, Unrealized Gain (Loss)
Investments, Debt and Equity Securities [Abstract]
Investments, Debt and Equity Securities [Abstract]
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.
Total return swap
Total Return Swap [Member]
Schedule of Stock by Class [Table]
Stock, Class of Stock [Table]
Investment income
Gross Investment Income, Operating
Scheduled principal payments on debt in year five
Long-Term Debt, Maturity, Year Five
Reductions due to sales or redemptions
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Securities Sold
Derivative liabilities
Derivative Liability
Non-PEO NEO
Non-PEO NEO [Member]
Senior Notes
Senior Notes [Member]
Entity Address, Address Line One
Entity Address, Address Line One
Total costs and expenses
Benefits, Losses and Expenses
Provision for income taxes
Provision for income taxes
Income Tax Expense (Benefit)
Collateralized loan obligations
Collateralized Loan Obligations [Member]
Accumulated Other Comprehensive Income, Net of Tax ("AOCI")
Comprehensive Income, Policy [Policy 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.
Issuances of managed investment entities’ liabilities
Proceeds From Issuance Of Managed Investment Entities
Proceeds from issuance of managed investment entities
Forfeitures of restricted stock (shares)
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited
Award Timing Method
Award Timing Method [Text Block]
Net Change in Cash and Cash Equivalents
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation
Forgone Recovery, Explanation of Impracticability
Forgone Recovery, Explanation of Impracticability [Text Block]
Agents’ balances and premiums receivable
Premiums Receivable, Net
Variable interest entity, primary beneficiary
Variable Interest Entity, Primary Beneficiary [Member]
Accumulated Other Comprehensive Income [Roll Forward]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Average life of RMBS
Mortgage Backed Securities Average Useful Life
Mortgage backed securities average useful life.
Net Earnings
Net earnings
Net Income (Loss) Attributable to Parent
Long-term Debt, Type [Axis]
Long-Term Debt, Type [Axis]
Erroneous Compensation Analysis
Erroneous Compensation Analysis [Text Block]
Location, Statement of Financial Position, Balance [Axis]
Location, Statement of Financial Position, Balance [Axis]
Statement [Table]
Statement [Table]
Restatement Determination Date:
Restatement Determination Date [Axis]
Components of accumulated other comprehensive income (loss)
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
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.
Leases
Lessee, Leases [Policy Text Block]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
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)
Deferred Policy Acquisition Costs (“DPAC”)
Deferred Policy Acquisition Costs, Policy [Policy Text Block]
Mortgage loans
Mortgage Loans on Real Estate, Commercial and Consumer, Net
Stock Incentive Plan
Share-Based Payment Arrangement [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Revenues:
Revenues [Abstract]
Unpaid Losses and Loss Adjustment Expenses
Unpaid Policy Claims and Claims Adjustment Expense, Policy [Policy Text Block]
Fixed maturities with embedded derivatives
Fixed Maturity Securities with Embedded Derivatives [Member]
Fixed maturity securities with embedded derivatives.
AFG's internal investment professionals
Number Of Internal Investment Professionals
Number of internal investment professionals.
Pension Benefits Adjustments, Footnote
Pension Benefits Adjustments, Footnote [Text Block]
Other
Other Long-Term Investments [Member]
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Secured Overnight Financing Rate (SOFR) [Member]