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Fair Value of Financial Instruments - Quantitative Information about Level 3 Fair Value Measurements (Details) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
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Fair Value Measurement Inputs and Valuation Techniques |  |
Fair Value | $ 6,239,300,000 | $ 6,345,300,000
Equity securities at fair value | $ 147,200,000 | 121,600,000
Minimum | discounted cash flow | Fair Value, Inputs, Level 3 | volatility |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Equity securities, measurement input | 100.00 |
Minimum | discounted cash flow | Fair Value, Inputs, Level 3 | option budget |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Derivatives embedded in fixed indexed annuity products, measurement input | 0.009 |
Maximum | discounted cash flow | Fair Value, Inputs, Level 3 | volatility |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Equity securities, measurement input | 121.95 |
Maximum | discounted cash flow | Fair Value, Inputs, Level 3 | option budget |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Derivatives embedded in fixed indexed annuity products, measurement input | 0.025 |
Weighted Average | discounted cash flow | Fair Value, Inputs, Level 3 | lapse rate |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Derivatives embedded in fixed indexed annuity products, measurement input | 0.053 |
Weighted Average | discounted cash flow | Fair Value, Inputs, Level 3 | Mortality multiplier |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Derivatives embedded in fixed indexed annuity products, measurement input | 0.668 |
Weighted Average | discounted cash flow | Fair Value, Inputs, Level 3 | Non-performance adjustment |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Derivatives embedded in fixed indexed annuity products, measurement input | 0.050 |
Municipal bonds |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Fair Value | $ 1,703,400,000 | 1,827,500,000
Municipal bonds | Minimum | discounted cash flow | Fair Value, Inputs, Level 3 | I spread |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.0374 |
Municipal bonds | Maximum | discounted cash flow | Fair Value, Inputs, Level 3 | I spread |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.0425 |
Corporate bonds |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Fair Value | $ 2,388,700,000 | 2,122,900,000
Corporate bonds | Minimum | discounted cash flow | Fair Value, Inputs, Level 3 | I spread |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 333 |
Corporate bonds | Minimum | discounted cash flow | Fair Value, Inputs, Level 3 | N spread |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.0211 |
Corporate bonds | Minimum | discounted cash flow | Fair Value, Inputs, Level 3 | T spread |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 130 |
Corporate bonds | Minimum | discounted cash flow | Fair Value, Inputs, Level 3 | yield |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.034 |
Corporate bonds | Minimum | discounted cash flow | Fair Value, Inputs, Level 3 | discount rate |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.113 |
Corporate bonds | Maximum | discounted cash flow | Fair Value, Inputs, Level 3 | I spread |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 365 |
Corporate bonds | Maximum | discounted cash flow | Fair Value, Inputs, Level 3 | N spread |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.0531 |
Corporate bonds | Maximum | discounted cash flow | Fair Value, Inputs, Level 3 | T spread |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 540 |
Corporate bonds | Maximum | discounted cash flow | Fair Value, Inputs, Level 3 | yield |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.088 |
Corporate bonds | Maximum | discounted cash flow | Fair Value, Inputs, Level 3 | discount rate |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.120 |
Corporate bonds | Weighted Average | market comparable | Fair Value, Inputs, Level 3 | option adjusted spread |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.125 |
Other asset-backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Fair Value | $ 1,075,200,000 | $ 1,231,800,000
Other asset-backed securities | discounted cash flow | Fair Value, Inputs, Level 3 | N spread |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.0341 |
Other asset-backed securities | discounted cash flow | Fair Value, Inputs, Level 3 | T spread |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.0196 |
Other asset-backed securities | Minimum | discounted cash flow | Fair Value, Inputs, Level 3 | discount rate |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.085 |
Other asset-backed securities | Minimum | discounted cash flow | Fair Value, Inputs, Level 3 | median comparable yield |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.073 |
Other asset-backed securities | Minimum | market comparable | Fair Value, Inputs, Level 3 | median price |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 54.79 |
Other asset-backed securities | Minimum | vendor price | Fair Value, Inputs, Level 3 | haircut |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.030 |
Other asset-backed securities | Maximum | discounted cash flow | Fair Value, Inputs, Level 3 | discount rate |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.200 |
Other asset-backed securities | Maximum | discounted cash flow | Fair Value, Inputs, Level 3 | median comparable yield |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.161 |
Other asset-backed securities | Maximum | market comparable | Fair Value, Inputs, Level 3 | median price |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 97.95 |
Other asset-backed securities | Maximum | vendor price | Fair Value, Inputs, Level 3 | haircut |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.050 |
Other asset-backed securities | Weighted Average | discounted cash flow | Fair Value, Inputs, Level 3 | discount margin |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.146 |

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