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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] Available-for-sale and held-to-maturity, gross unrealized losses Debt Securities, Available-for-Sale And Held-to-Maturity, Unrealized Loss Position, Accumulated Loss [Abstract] Debt Securities, Available-for-Sale And Held-to-Maturity, Unrealized Loss Position, Accumulated Loss Accident & Health Accident & Health [Member] Accident & Health Fair Value Measurement [Domain] Fair Value Measurement [Domain] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] SPA1925 SPA1925 [Member] SPA1925 Tranche A DDTL Tranche A DDTL [Member] Tranche A DDTL Reclassifications Reclassification, Comparability Adjustment [Policy Text Block] Insurance [Abstract] Equity method investments, unfunded commitment Equity Method Investments, Unfunded Commitment Equity Method Investments, Unfunded Commitment UK UNITED KINGDOM Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Equity Awards Adjustments Equity Awards Adjustments [Member] Assumed premiums Assumed Premiums Earned Hedging Relationship [Domain] Hedging Relationship [Domain] Schedule of Accounts, Notes, Loans and Financing Receivable Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Income Tax Jurisdiction [Domain] Income Tax Jurisdiction [Domain] Losses and Loss 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] Syndicate 1969 Syndicate 1969 - Lloyd’s Specialist Syndicate [Member] Syndicate 1969 - Lloyd’s Specialist Syndicate Corporate expenses General and Administrative Expense 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] Income Taxes Income Tax Disclosure [Text Block] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] 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] Number of securities, allowance for credit loss Debt Securities, Available-for-Sale, Allowance for Credit Loss, Number of Positions Debt Securities, Available-for-Sale, Allowance for Credit Loss, Number of Positions 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) Entity Address, Address Line Two Entity Address, Address Line Two Reinsurance recoverables, net Business Combination, Recognized Asset Acquired, Reinsurance Recoverable, Net Business Combination, Recognized Asset Acquired, Reinsurance Recoverable, Net 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] 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 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 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 Fee‑based service expenses Fee‑based Service Expenses Fee‑based Service Expenses Syndicate 1969 capacity - with fees Syndicate 1969 Capacity [Member] Syndicate 1969 Capacity Fixed maturity securities, held-to-maturity Fixed Maturity Securities, Held-to-Maturity [Member] Fixed Maturity Securities, Held-to-Maturity 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 Debt term Long-Term Debt, Term Proceeds from Loans Proceeds from Loans Derivative Instruments and Hedging Activities Disclosure [Abstract]