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Fair Value of Financial Instruments - Quantitative Information about Level 3 Fair Value Measurements (Details) | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
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Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, available-for-sale | $ 5,987,400,000 | $ 6,239,300,000
Equity securities at fair value | 126,800,000 | 147,200,000
Carrying Amount |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Equity securities at fair value | 126,800,000 | 147,200,000
Municipal bonds |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, available-for-sale | 1,579,500,000 | 1,703,400,000
Municipal bonds | Carrying Amount |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, available-for-sale | 1,579,500,000 | 1,703,400,000
Corporate bonds |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, available-for-sale | 2,296,000,000 | 2,388,700,000
Corporate bonds | Carrying Amount |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, available-for-sale | $ 2,296,000,000 | 2,388,700,000
Other asset-backed securities | Carrying Amount |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, available-for-sale |  | $ 1,075,200,000
Level 3 | discounted cash flow | volatility | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Equity securities, measurement input | 100.00 |
Level 3 | discounted cash flow | volatility | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Equity securities, measurement input | 121.95 |
Level 3 | discounted cash flow | lapse rate | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Derivatives embedded in fixed indexed annuity products, measurement input | 0.053 |
Level 3 | discounted cash flow | mortality multiplier | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Derivatives embedded in fixed indexed annuity products, measurement input | 0.668 |
Level 3 | discounted cash flow | option budget | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Derivatives embedded in fixed indexed annuity products, measurement input | 0.009 |
Level 3 | discounted cash flow | option budget | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Derivatives embedded in fixed indexed annuity products, measurement input | 0.025 |
Level 3 | discounted cash flow | non-performance adjustment | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Derivatives embedded in fixed indexed annuity products, measurement input | 0.050 |
Level 3 | Municipal bonds | discounted cash flow | I Spread | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.0360 |
Level 3 | Municipal bonds | discounted cash flow | I Spread | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.0409 |
Level 3 | Corporate bonds | discounted cash flow | N Spread | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.0213 |
Level 3 | Corporate bonds | discounted cash flow | N Spread | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.0379 |
Level 3 | Corporate bonds | discounted cash flow | T spread | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 100 |
Level 3 | Corporate bonds | discounted cash flow | T spread | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 560 |
Level 3 | Corporate bonds | discounted cash flow | yield | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.027 |
Level 3 | Corporate bonds | discounted cash flow | yield | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.107 |
Level 3 | Corporate bonds | discounted cash flow | discount rate | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.113 |
Level 3 | Corporate bonds | discounted cash flow | discount rate | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.120 |
Level 3 | Corporate bonds | market comparable | option adjusted spread | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.125 |
Level 3 | Other asset-backed securities | discounted cash flow | N Spread | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.0213 |
Level 3 | Other asset-backed securities | discounted cash flow | N Spread | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.0379 |
Level 3 | Other asset-backed securities | discounted cash flow | T spread | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.0100 |
Level 3 | Other asset-backed securities | discounted cash flow | T spread | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.0560 |
Level 3 | Other asset-backed securities | discounted cash flow | discount rate | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.085 |
Level 3 | Other asset-backed securities | discounted cash flow | discount rate | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.200 |
Level 3 | Other asset-backed securities | discounted cash flow | discount margin | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.146 |
Level 3 | Other asset-backed securities | discounted cash flow | median comparable yield | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.100 |
Level 3 | Other asset-backed securities | discounted cash flow | median comparable yield | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.220 |
Level 3 | Other asset-backed securities | market comparable | median price | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 28.54 |
Level 3 | Other asset-backed securities | market comparable | median price | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 92.06 |
Level 3 | Other asset-backed securities | vendor price | haircut | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.030 |
Level 3 | Other asset-backed securities | vendor price | haircut | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.050 |

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