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Fair Value of Financial Instruments - Quantitative Information about Level 3 Fair Value Measurements (Details) | Sep. 30, 2022 USD ($) | Dec. 31, 2021 USD ($)
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Fair Value Measurement Inputs and Valuation Techniques |  |
Fair Value | $ 5,272,100,000 | $ 6,239,300,000
Equity securities at fair value | 113,800,000 | 147,200,000
Fair Value |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Equity securities at fair value | 113,800,000 | 147,200,000
Derivatives embedded in fixed indexed annuity products | 89,900,000 | 106,600,000
Municipal bonds |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Fair Value | 1,307,900,000 | 1,703,400,000
Municipal bonds | Fair Value |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Fair Value | 1,307,900,000 | 1,703,400,000
Corporate bonds |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Fair Value | 1,927,800,000 | 2,388,700,000
Corporate bonds | Fair Value |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Fair Value | 1,927,800,000 | 2,388,700,000
Level 3 | Fair Value |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Equity securities at fair value | 2,000,000.0 | 1,400,000
Derivatives embedded in fixed indexed annuity products | 89,900,000 | 106,600,000
Level 3 | Municipal bonds | Fair Value |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Fair Value | 53,300,000 | 60,800,000
Level 3 | Corporate bonds | Fair Value |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Fair Value | $ 239,800,000 | $ 210,300,000
Level 3 | Corporate bonds | exit cap rate | discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.062 |
Level 3 | Corporate bonds | EV / Fwd EBITDA (x) | market comparable |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 5.1 |
Level 3 | Mortgage-backed and other asset-backed securities | Fair Value |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Fair Value | $ 107,200,000 |
Minimum | Level 3 | volatility | black-scholes |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Equity securities, measurement input | 0.320 |
Minimum | Level 3 | option budget | discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Derivatives embedded in fixed indexed annuity products, measurement input | 0.009 |
Minimum | Level 3 | Municipal bonds | option adjusted spread | discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.0330 |
Minimum | Level 3 | Corporate bonds | option adjusted spread | discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.0242 |
Minimum | Level 3 | Corporate bonds | N spread | discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.0363 |
Minimum | Level 3 | Corporate bonds | T Spread | discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.0016 |
Minimum | Level 3 | Corporate bonds | yield | discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.038 |
Minimum | Level 3 | Corporate bonds | occupancy rate | discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.310 |
Minimum | Level 3 | Corporate bonds | discount rate | discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.113 |
Minimum | Level 3 | Mortgage-backed and other asset-backed securities | discounted cash flow | London Interbank Offered Rate (LIBOR) |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.010 |
Minimum | Level 3 | Mortgage-backed and other asset-backed securities | N spread | discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.0463 |
Minimum | Level 3 | Mortgage-backed and other asset-backed securities | T Spread | discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.0226 |
Minimum | Level 3 | Mortgage-backed and other asset-backed securities | yield | discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.070 |
Minimum | Level 3 | Mortgage-backed and other asset-backed securities | discount rate | discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.160 |
Minimum | Level 3 | Mortgage-backed and other asset-backed securities | discount margin | discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.304 |
Minimum | Level 3 | Mortgage-backed and other asset-backed securities | median comparable yield | discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.172 |
Minimum | Level 3 | Mortgage-backed and other asset-backed securities | PDI spread | discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.068 |
Minimum | Level 3 | Mortgage-backed and other asset-backed securities | SBL spread | discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.045 |
Minimum | Level 3 | Mortgage-backed and other asset-backed securities | weighting | discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.170 |
Minimum | Level 3 | Mortgage-backed and other asset-backed securities | CPR | discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.200 |
Minimum | Level 3 | Mortgage-backed and other asset-backed securities | default rate annual | discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.040 |
Minimum | Level 3 | Mortgage-backed and other asset-backed securities | recovery | discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.650 |
Maximum | Level 3 | volatility | black-scholes |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Equity securities, measurement input | 0.470 |
Maximum | Level 3 | option budget | discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Derivatives embedded in fixed indexed annuity products, measurement input | 0.033 |
Maximum | Level 3 | Municipal bonds | option adjusted spread | discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.0446 |
Maximum | Level 3 | Corporate bonds | option adjusted spread | discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.0393 |
Maximum | Level 3 | Corporate bonds | T Spread | discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.0403 |
Maximum | Level 3 | Corporate bonds | yield | discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.112 |
Maximum | Level 3 | Corporate bonds | occupancy rate | discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 1.000 |
Maximum | Level 3 | Corporate bonds | discount rate | discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.120 |
Maximum | Level 3 | Mortgage-backed and other asset-backed securities | yield | discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.074 |
Maximum | Level 3 | Mortgage-backed and other asset-backed securities | discount rate | discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.210 |
Maximum | Level 3 | Mortgage-backed and other asset-backed securities | median comparable yield | discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.331 |
Maximum | Level 3 | Mortgage-backed and other asset-backed securities | weighting | discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.830 |
Weighted Average | Level 3 | lapse rate | discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Derivatives embedded in fixed indexed annuity products, measurement input | 0.053 |
Weighted Average | Level 3 | mortality multiplier | discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Derivatives embedded in fixed indexed annuity products, measurement input | 0.668 |
Weighted Average | Level 3 | non-performance adjustment | discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Derivatives embedded in fixed indexed annuity products, measurement input | 0.050 |
Weighted Average | Level 3 | Corporate bonds | weighted average cost of capital | discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.050 |

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