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Instrument [Axis] Debt Instrument [Axis] Maturities, calls and paydowns of fixed maturity securities held-to-maturity Proceeds from Maturities, Prepayments and Calls of Held-to-Maturity Securities Basic earnings per share (in dollar per share) Earnings Per Share, Basic Measurement Input Type [Axis] Measurement Input Type [Axis] Insider Trading Arrangements [Line Items] Sales of and distributions from equity method and other long-term investments Payments for (Proceeds from) Long-Term Investments Amortization of policy acquisition costs Deferred Policy Acquisition Costs, Amortization Expense 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] RISCOM RISCOM [Member] RISCOM Fair Value Measurement [Domain] Fair Value Measurement [Domain] Compensation Actually Paid vs. Company Selected Measure 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Adjustment Expenses Liability for Future Policy Benefits and Unpaid Claims Disclosure [Text Block] Short-term investments Short-Term Investments [Member] Held-to-maturity, fair value Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position [Abstract] Corporate expenses General and Administrative Expense Mortgage loans Mortgage Loans, Unrealized Gain (Loss) Mortgage Loans, Unrealized Gain (Loss) Commercial mortgage-backed securities Commercial Mortgage-Backed Securities [Member] Hedging Designation [Domain] Hedging Designation [Domain] Statement of Cash Flows [Abstract] Current period provision for credit losses Debt Securities, Held-to-Maturity, Excluding Accrued Interest, Credit Loss Expense (Reversal) Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Income Tax Jurisdiction [Axis] Income Tax Jurisdiction [Axis] Schedule of Held-to-Maturity, Changes in Allowance for Credit Loss Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Table Text Block] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Other Gain on Sale of Other Investments Gain on Sale of Other Investments Income Taxes Income Tax Disclosure [Text Block] Ceded unearned premium Business Combination, Recognized Asset Acquired, Ceded Unearned Premium Business Combination, Recognized Asset Acquired, Ceded Unearned Premium Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] SUA fee income Managing General Insurance Agent And Broker, Fee Icome [Member] Managing General Insurance Agent And Broker, Fee Icome Business combination, consideration transferred Total consideration Business Combination, Consideration Transferred Entity Filer Category Entity Filer Category Total Debt Securities, Available-for-Sale, Unrealized Loss Position Numerator Preferred Stock Dividends and Other Adjustments [Abstract] Agent Relationships Agent Relationship [Member] Agent Relationship Arena SOP LP units Arena SOP LP [Member] Arena SOP LP Equity Method Investments and Joint Ventures [Abstract] Investments, Debt and Equity Securities [Abstract] Earned Premiums Earned, Net [Abstract] Schedule of Gain (Loss) on Securities Gain (Loss) on Securities [Table Text Block] Total gains (losses) for the period recognized in net investment gains (losses) attributable to the change in unrealized gains or losses relating to assets held as of period end Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) Syndicate Capacity Syndicate [Member] Syndicate Variable Interest Entity [Abstract] Variable Interest Entity [Abstract] Variable Interest Entity Entity Address, Address Line Two Entity Address, Address Line Two Deferred policy acquisition costs and VOBA Business Combination, Recognized Asset Acquired, Deferred Policy Acquisition Costs and VOBA Business Combination, Recognized Asset Acquired, Deferred Policy Acquisition Costs and VOBA Foreign Currency Foreign Currency Transactions and Translations Policy [Policy Text Block] Entity Address, Address Line One Entity Address, Address Line One Total expenses Benefits, Losses and Expenses Income tax expense Income Tax Expense (Benefit) Fair Value Hedging Fair Value Hedging [Member] FHLB Loan Term Loan Due August 2029 [Member] Term Loan Due August 2029 Premiums and commissions receivable, net Premiums Receivable, Net Variable Interest Entity, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Deferred income taxes Business Combination, Recognized Liability Assumed, Deferred Tax Liability Total incurred, net of reinsurance Liability For Unpaid Claims And Claims Adjustment Expense, Incurred Claims, Net Liability For Unpaid Claims And Claims Adjustment Expense, Incurred Claims, Net Statement [Table] Statement [Table] Corporate Nonsegment Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] Write-offs Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Writeoff Fed Funds Effective Rate Overnight Index Swap Rate Fed Funds Effective Rate Overnight Index Swap Rate [Member] Derivative assets, fair value Derivative Asset, Subject to Master Netting Arrangement, before Offset Syndicate 1971 capacity - with fees Syndicate 1971 Capacity [Member] Syndicate 1971 Capacity Debt term Long-Term Debt, Term Proceeds from Loans Proceeds from Loans Derivative Instruments and Hedging Activities Disclosure [Abstract]