| Current Federal Tax Expense (Benefit) | 171.80M | 2025-01-01 → 2025-12-31 |
| Current State and Local Tax Expense (Benefit) | 30.50M | 2025-01-01 → 2025-12-31 |
| Current Foreign Tax Expense (Benefit) | 59.70M | 2025-01-01 → 2025-12-31 |
| Current Income Tax Expense (Benefit) | 262.00M | 2025-01-01 → 2025-12-31 |
| Deferred Federal Income Tax Expense (Benefit) | -112.30M | 2025-01-01 → 2025-12-31 |
| Deferred State and Local Income Tax Expense (Benefit) | 6.20M | 2025-01-01 → 2025-12-31 |
| SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Other Operating Expense | 5.03B | 2025-01-01 → 2025-12-31 |
| Deferred Foreign Income Tax Expense (Benefit) | 4.60M | 2025-01-01 → 2025-12-31 |
| Financing Receivable, Accrued Interest, Writeoff | 3.90M | 2025-01-01 → 2025-12-31 |
| Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization | 701.40M | as of 2025-12-31 |
| Federal Income Tax Expense (Benefit), Continuing Operations | 59.50M | 2025-01-01 → 2025-12-31 |
| State and Local Income Tax Expense (Benefit), Continuing Operations | 36.70M | 2025-01-01 → 2025-12-31 |
| SEC Schedule, 12-17, Insurance Companies, Reinsurance, Life Insurance in Force, Gross | 764.02B | as of 2025-12-31 |
| Foreign Income Tax Expense (Benefit), Continuing Operations | 64.30M | 2025-01-01 → 2025-12-31 |
| SEC Schedule, 12-17, Insurance Companies, Reinsurance, Life Insurance in Force, Ceded | 243.75B | as of 2025-12-31 |
| SEC Schedule, 12-17, Insurance Companies, Reinsurance, Life Insurance in Force, Assumed | 154.30M | as of 2025-12-31 |
| SEC Schedule, 12-17, Insurance Companies, Reinsurance, Life Insurance in Force, Net | 520.42B | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Accrued Interest Writeoff | 400.00K | 2025-01-01 → 2025-12-31 |
| SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties, Cost | 115.11B | as of 2025-12-31 |
| SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties, Amount | 110.90B | as of 2025-12-31 |
| Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement | 1.22B | as of 2025-12-31 |
| Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount | 297.40M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount | 29.00M | 2025-01-01 → 2025-12-31 |
| EffectiveIncomeTaxRateReconciliationCrossBorderTaxEffectAmount | 5.20M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount | 31.70M | 2025-01-01 → 2025-12-31 |
| Direct Premiums Earned | 7.33B | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount | 13.00M | 2025-01-01 → 2025-12-31 |
| Ceded Premiums Earned | 549.90M | 2025-01-01 → 2025-12-31 |
| Assumed Premiums Earned | 500.00K | 2025-01-01 → 2025-12-31 |
| Debt Securities, Trading, Unrealized Gain (Loss) | 1.70M | 2025-01-01 → 2025-12-31 |
| Debt Securities, Trading, Gain (Loss) | 800.00K | 2025-01-01 → 2025-12-31 |
| Equity Securities, FV-NI, Unrealized Gain (Loss) | 45.70M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount | 5.60M | 2025-01-01 → 2025-12-31 |
| Equity Securities, FV-NI, Gain (Loss) | 119.30M | 2025-01-01 → 2025-12-31 |
| Line of Credit Facility, Maximum Borrowing Capacity | 909.70M | as of 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Deduction, Dividends, Amount | 79.50M | 2025-01-01 → 2025-12-31 |
| Noncontrolling Interest, Decrease from Deconsolidation | 15.60M | 2025-01-01 → 2025-12-31 |
| Dividends, Common Stock | 684.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount | -25.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Equity in Earnings (Losses) of Unconsolidated Subsidiary, Amount | 29.00M | 2025-01-01 → 2025-12-31 |
| Debt Securities, Available-for-sale, Realized Gain | 11.40M | 2025-01-01 → 2025-12-31 |
| Debt Securities, Available-for-sale, Realized Loss | 58.60M | 2025-01-01 → 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year One | 50.30M | as of 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year Two | 50.00M | as of 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year Three | 33.90M | as of 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year Four | 32.50M | as of 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year Five | 32.50M | as of 2025-12-31 |
| Loss Contingency, Undiscounted Amount of Insurance-related Assessment Liability | 18.80M | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost | 50.66B | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost | 26.93B | as of 2025-12-31 |
| Treasury Stock, Value, Acquired, Cost Method | 901.30M | 2025-01-01 → 2025-12-31 |
| Loss Contingency Accrual, Insurance-related Assessment, Premium Tax Offset | 14.30M | as of 2025-12-31 |
| Net Income (Loss) Available to Common Stockholders, Diluted | 1.19B | 2025-01-01 → 2025-12-31 |
| Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost | 1.54B | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Amortized Cost | 9.90B | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Amortized Cost | 9.68B | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost | 29.54B | as of 2025-12-31 |
| Derivative, Notional Amount | 107.31B | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value | 47.07B | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value | 26.29B | as of 2025-12-31 |
| Capitalized Contract Cost, Amortization | 80.50M | 2025-01-01 → 2025-12-31 |
| Capitalized Contract Cost, Impairment Loss | 45.40M | 2025-01-01 → 2025-12-31 |
| Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value | 1.53B | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value | 9.88B | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Fair Value | 9.66B | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value | 26.01B | as of 2025-12-31 |
| Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | 62.60M | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 125.70M | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 5.10B | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 5.22B | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1.05B | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 5.23B | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 6.06B | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 33.57B | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Unrealized Loss Position | 39.63B | as of 2025-12-31 |
| Stock Issued During Period, Value, New Issues | 43.70M | 2025-01-01 → 2025-12-31 |
| Goodwill, Foreign Currency Translation Gain (Loss) | 50.80M | 2025-01-01 → 2025-12-31 |
| Funds Held under Reinsurance Agreements, Liability | 17.78B | as of 2025-12-31 |
| Operating Lease, Cost | 49.40M | 2025-01-01 → 2025-12-31 |
| Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits | 319.70M | as of 2025-12-31 |
| Lease, Cost | 86.30M | 2025-01-01 → 2025-12-31 |
| Finance Lease, Liability, Payment, Due | 44.30M | as of 2025-12-31 |
| Finance Lease, Liability, Payments, Due in Next Rolling Twelve Months | 24.70M | as of 2025-12-31 |
| Finance Lease, Liability, Payments, Due in Rolling Year Two | 15.00M | as of 2025-12-31 |
| Finance Lease, Liability, Payments, Due in Rolling Year Three | 4.40M | as of 2025-12-31 |
| Finance Lease, Liability, Payments, Due in Rolling Year Four | 200.00K | as of 2025-12-31 |
| Finance Lease, Liability, Undiscounted Excess Amount | 1.70M | as of 2025-12-31 |
| Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross | 851.80M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid | 139.20M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, Payments, Due Next Rolling Twelve Months | 40.70M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Two | 36.30M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Three | 22.60M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Four | 12.10M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Five | 8.20M | as of 2025-12-31 |
| Deferred Tax Assets, Gross | 1.27B | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, Payments, Due after Rolling Year Five | 19.30M | as of 2025-12-31 |
| Deferred Tax Assets, Valuation Allowance | 82.10M | as of 2025-12-31 |
| Deferred Tax Assets, Net of Valuation Allowance | 1.19B | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, Undiscounted Excess Amount | 15.20M | as of 2025-12-31 |
| Deferred Tax Liabilities, Gross | 2.82B | as of 2025-12-31 |
| Long-term Debt, Gross | 3.96B | as of 2025-12-31 |
| Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net | 2.20M | 2025-01-01 → 2025-12-31 |
| Deferred Tax Liabilities, Intangible Assets | 345.50M | as of 2025-12-31 |
| Deferred Tax Liabilities, Other | 111.60M | as of 2025-12-31 |
| Deferred Tax Liabilities, Net | 1.64B | as of 2025-12-31 |
| Hedged Liability, Fair Value Hedge | 3.74B | as of 2025-12-31 |
| Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) | 35.40M | as of 2025-12-31 |
| Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months | 32.80M | 2025-01-01 → 2025-12-31 |
| Long-Term Debt, Maturity, Year One | 349.70M | as of 2025-12-31 |
| Current Year Claims and Claims Adjustment Expense | 1.81B | 2025-01-01 → 2025-12-31 |
| Long-Term Debt, Maturity, Year Two | 100.00K | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Three | 393.00M | as of 2025-12-31 |
| Prior Year Claims and Claims Adjustment Expense | -129.20M | 2025-01-01 → 2025-12-31 |
| Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims | 1.68B | 2025-01-01 → 2025-12-31 |
| Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year | 1.35B | 2025-01-01 → 2025-12-31 |
| Long-Term Debt, Maturity, Year Four | 497.60M | as of 2025-12-31 |
| Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years | 367.30M | 2025-01-01 → 2025-12-31 |
| Long-Term Debt, Maturity, Year Five | 597.70M | as of 2025-12-31 |
| Long-Term Debt, Maturity, after Year Five | 2.09B | as of 2025-12-31 |
| Operating Loss Carryforwards, Valuation Allowance | 82.10M | as of 2025-12-31 |
| DebtSecuritiesAvailableForSaleExcludingAccruedInterestAllowanceForCreditLossNotPreviouslyRecorded | 24.20M | 2025-01-01 → 2025-12-31 |
| DebtSecuritiesAvailableForSaleExcludingAccruedInterestAllowanceForCreditLossWriteoff | 16.20M | 2025-01-01 → 2025-12-31 |
| Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | 32.20M | as of 2025-12-31 |
| Unrecognized Tax Benefits | 18.60M | as of 2025-12-31 |
| Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions | 700.00K | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions | 3.20M | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | 15.30M | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 1.30M | as of 2025-12-31 |
| Liability for Future Policy Benefit, before Reinsurance | 39.99B | as of 2025-12-31 |
| Liability for Future Policy Benefit, Gross Premium Income | 5.07B | 2025-01-01 → 2025-12-31 |
| Liability for Future Policy Benefit, Interest Expense | 2.19B | 2025-01-01 → 2025-12-31 |
| LiabilityForFuturePolicyBenefitRemeasurementGainLoss | -56.40M | 2025-01-01 → 2025-12-31 |
| Income (Loss) from Continuing Operations before Income Taxes, Domestic | 1.04B | 2025-01-01 → 2025-12-31 |
| Income (Loss) from Continuing Operations before Income Taxes, Foreign | 374.90M | 2025-01-01 → 2025-12-31 |
| AdditionalLiabilityLongDurationInsuranceOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange | 6.60B | as of 2025-12-31 |
| MarketRiskBenefitAssetAmount | 197.10M | as of 2025-12-31 |
| MarketRiskBenefitLiabilityAmount | 66.90M | as of 2025-12-31 |
| Market Risk Benefit, Change in Fair Value, Gain (Loss) | -63.10M | 2025-01-01 → 2025-12-31 |
| DirectFinancingLeaseNetInvestmentInLeaseOriginatedInCurrentFiscalYear | 44.60M | as of 2025-12-31 |
| DirectFinancingLeaseNetInvestmentInLeaseOriginatedInFiscalYearBeforeLatestFiscalYear | 10.60M | as of 2025-12-31 |
| Direct Financing Lease, Net Investment in Lease, Year Three, Originated, Two Years before Current Fiscal Year | 2.10M | as of 2025-12-31 |
| DirectFinancingLeaseNetInvestmentInLeaseOriginatedThreeYearsBeforeLatestFiscalYear | 127.70M | as of 2025-12-31 |
| Direct Financing Lease, Net Investment in Lease, Year Five, Originated, Four Years before Current Fiscal Year | 48.70M | as of 2025-12-31 |
| Direct Financing Lease, Net Investment in Lease, Originated, More than Five Years before Current Fiscal Year | 342.80M | as of 2025-12-31 |
| Credit Derivative, Maximum Exposure, Undiscounted | 946.00M | as of 2025-12-31 |
| Financing Receivable, Nonaccrual, Interest Income | 800.00K | 2025-01-01 → 2025-12-31 |
| Derivative, Net Liability Position, Aggregate Fair Value | 546.90M | as of 2025-12-31 |
| Collateral Already Posted, Aggregate Fair Value | 491.10M | as of 2025-12-31 |
| Additional Collateral, Aggregate Fair Value | 121.10M | as of 2025-12-31 |
| Short-Duration Contracts, Discounted Liabilities, Amount | 1.19B | as of 2025-12-31 |
| Short-duration Insurance Contract, Discounted Liability, Discount | 230.50M | as of 2025-12-31 |
| Embedded Derivative, Fair Value of Embedded Derivative Liability | -2.63B | as of 2025-12-31 |
| Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 1.36B | as of 2025-12-31 |
| Short-duration Insurance Contracts, Liability for Unpaid Claims and Claims Adjustment Expense, Accumulated Unallocated Claim Adjustment Expense | 30.70M | as of 2025-12-31 |
| Closed Block Operations, Premiums | 153.80M | 2025-01-01 → 2025-12-31 |
| Closed Block Operations, Net Investment Income | 127.60M | 2025-01-01 → 2025-12-31 |
| Closed Block Operations, Realized Investment Gains (Losses) | 1.10M | 2025-01-01 → 2025-12-31 |
| Closed Block Operations, Revenue | 282.50M | 2025-01-01 → 2025-12-31 |
| Closed Block Operations, Policyholder Dividends | 89.30M | 2025-01-01 → 2025-12-31 |
| Closed Block Operations, Benefits and Expense | 254.50M | 2025-01-01 → 2025-12-31 |
| Closed Block Operations, Results before Income Taxes | 28.00M | 2025-01-01 → 2025-12-31 |
| Closed Block Operations, Income Taxes | 4.90M | 2025-01-01 → 2025-12-31 |
| Closed Block Operations, Net Results | 23.10M | 2025-01-01 → 2025-12-31 |
| Closed Block Dividend Obligation | 0 | as of 2025-12-31 |
| Closed Block Liabilities, Future Policy Benefits and Policyholder Account Balances | 2.72B | as of 2025-12-31 |
| Closed Block Liabilities, Other Policyholder Funds | 4.40M | as of 2025-12-31 |
| Closed Block Liabilities, Policyholder Dividends Payable | 153.70M | as of 2025-12-31 |
| Closed Block Liabilities, Other Closed Block Liabilities | 29.50M | as of 2025-12-31 |
| Closed Block Liabilities | 2.90B | as of 2025-12-31 |
| Assets Designated to Closed Block, Fixed Maturity, Available-for-sale, at Fair Value | 1.76B | as of 2025-12-31 |
| Assets Designated to Closed Block, Equity Securities, at Fair Value | 900.00K | as of 2025-12-31 |
| Assets Designated to Closed Block, Mortgage Loans on Real Estate | 359.20M | as of 2025-12-31 |
| Assets Designated to Closed Block, Trading Securities, Debt | 600.00K | as of 2025-12-31 |
| Assets Designated to Closed Block, Policy Loans | 329.40M | as of 2025-12-31 |
| Assets Designated to Closed Block, Other Investments | 54.10M | as of 2025-12-31 |
| Assets Designated to Closed Block, Investments | 2.50B | as of 2025-12-31 |
| Assets Designated to Closed Block, Cash and Cash Equivalents | 54.20M | as of 2025-12-31 |
| Assets Designated to Closed Block, Accrued Investment Income | 30.80M | as of 2025-12-31 |
| Assets Designated to Closed Block, Deferred Tax Asset, Net | 7.90M | as of 2025-12-31 |
| Assets Designated to Closed Block, Other Closed Block Assets | 600.00K | as of 2025-12-31 |
| Assets Designated to Closed Block | 2.60B | as of 2025-12-31 |
| Excess of Reported Closed Block Liabilities over Assets Designated to Closed Block | 303.60M | as of 2025-12-31 |
| Closed Block Assets and Liabilities, Maximum Future Earnings to be Recognized | 278.00M | as of 2025-12-31 |
| Closed Block Assets and Liabilities Maximum Future Earnings to be Recognized, Period Increase (Decrease) | 23.10M | 2025-01-01 → 2025-12-31 |
| Closed Block Assets and Liabilities, Effect on Other Comprehensive Income (Loss) | -25.60M | as of 2025-12-31 |
| Schedule of Fair Value of Separate Accounts by Major Category of Investment, Fair Value | 193.62B | as of 2025-12-31 |