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Fair Value of Financial Instruments - Quantitative Information about Level 3 Fair Value Measurements (Details) $ in Millions | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
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Fair Value Measurement Inputs and Valuation Techniques |  |
Fair Value | $ 5,350.0 | $ 5,185.0
Equity securities at fair value | 98.8 | 99.6
Municipal bonds |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Fair Value | 1,290.8 | 1,269.7
Corporate bonds |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Fair Value | $ 1,943.5 | $ 1,901.7
Level 3 | Municipal bonds | discounted cash flow | option adjusted spread |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.0308 |
Level 3 | Corporate bonds | discounted cash flow | option adjusted spread |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.0241 |
Level 3 | Corporate bonds | discounted cash flow | exit cap |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 6.2 |
Level 3 | Corporate bonds | vendor priced | vendor priced |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 79.64 |
Level 3 | Corporate bonds | market comparable | EV / Fwd EBITDA (x) |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 5.92 |
Level 3 | Mortgage-backed and other asset-backed securities | Fair Value |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Fair Value | $ 104.6 |
Level 3 | Mortgage-backed and other asset-backed securities | discounted cash flow | discount margin |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.395 |
Level 3 | Mortgage-backed and other asset-backed securities | discounted cash flow | PDI spread |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.055 |
Level 3 | Mortgage-backed and other asset-backed securities | discounted cash flow | SBL spread |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.045 |
Level 3 | Mortgage-backed and other asset-backed securities | discounted cash flow | CPR |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.200 |
Level 3 | Mortgage-backed and other asset-backed securities | discounted cash flow | default rate annual |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.040 |
Level 3 | Mortgage-backed and other asset-backed securities | discounted cash flow | recovery |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.650 |
Level 3 | Mortgage-backed and other asset-backed securities | discounted cash flow | I spread |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 175 |
Level 3 | Mortgage-backed and other asset-backed securities | discounted cash flow | N spread |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.0463 |
Level 3 | Mortgage-backed and other asset-backed securities | discounted cash flow | T Spread |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.0226 |
Level 3 | Mortgage-backed and other asset-backed securities | discounted cash flow | LIBOR |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.023 |
Level 3 | Mortgage-backed and other asset-backed securities | market comparable | median price |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 81.34 |
Minimum | Level 3 | discounted cash flow | option budget |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Derivatives embedded in fixed indexed annuity products, measurement input | 0.009 |
Minimum | Level 3 | black-scholes | volatility |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Equity securities, measurement input | 0.280 |
Minimum | Level 3 | black-scholes | time to exit |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Equity securities, measurement input | 2.67 |
Minimum | Level 3 | market comparable | price/book ExAOCI |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Equity securities, measurement input | 1.06 |
Minimum | Level 3 | Corporate bonds | discounted cash flow | yield |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.061 |
Minimum | Level 3 | Corporate bonds | discounted cash flow | discount rate |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 6.2 |
Minimum | Level 3 | Mortgage-backed and other asset-backed securities | discounted cash flow | yield |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.064 |
Minimum | Level 3 | Mortgage-backed and other asset-backed securities | discounted cash flow | discount rate |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.160 |
Minimum | Level 3 | Mortgage-backed and other asset-backed securities | discounted cash flow | median comparable yield |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.207 |
Minimum | Level 3 | Mortgage-backed and other asset-backed securities | discounted cash flow | weighting |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.170 |
Minimum | Level 3 | Mortgage-backed and other asset-backed securities | vendor priced | haircut |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.0001 |
Maximum | Level 3 | discounted cash flow | option budget |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Derivatives embedded in fixed indexed annuity products, measurement input | 0.035 |
Maximum | Level 3 | black-scholes | volatility |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Equity securities, measurement input | 0.440 |
Maximum | Level 3 | Corporate bonds | discounted cash flow | yield |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 11.0 |
Maximum | Level 3 | Corporate bonds | discounted cash flow | discount rate |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 10.7 |
Maximum | Level 3 | Mortgage-backed and other asset-backed securities | discounted cash flow | yield |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.065 |
Maximum | Level 3 | Mortgage-backed and other asset-backed securities | discounted cash flow | discount rate |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.210 |
Maximum | Level 3 | Mortgage-backed and other asset-backed securities | discounted cash flow | median comparable yield |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.432 |
Maximum | Level 3 | Mortgage-backed and other asset-backed securities | discounted cash flow | weighting |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.830 |
Maximum | Level 3 | Mortgage-backed and other asset-backed securities | vendor priced | haircut |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt securities, measurement input | 0.003 |
Weighted Average | Level 3 | discounted cash flow | lapse rate |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Derivatives embedded in fixed indexed annuity products, measurement input | 0.054 |
Weighted Average | Level 3 | discounted cash flow | mortality multiplier |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Derivatives embedded in fixed indexed annuity products, measurement input | 0.678 |
Weighted Average | Level 3 | discounted cash flow | non-performance adjustment |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Derivatives embedded in fixed indexed annuity products, measurement input | 0.050 |

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