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Fair Value of Financial Instruments - Quantitative Information about Level 3 Fair Value Measurements (Details) $ in Millions | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
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Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Equity securities at fair value | $ 99.6 | $ 147.2
Derivatives embedded in fixed indexed annuity products | 91.0 |
Fair Value |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Equity securities at fair value | 99.6 | 147.2
Fair Value, Inputs, Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivatives embedded in fixed indexed annuity products | 91.0 |
Fair Value, Inputs, Level 3 | Fair Value |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Equity securities at fair value | $ 2.0 | 1.4
discounted cash flow | Fair Value, Inputs, Level 3 | lapse rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivatives embedded in fixed indexed annuity products, measurement input | 0.054 |
discounted cash flow | Fair Value, Inputs, Level 3 | Mortality multiplier |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivatives embedded in fixed indexed annuity products, measurement input | 0.678 |
discounted cash flow | Fair Value, Inputs, Level 3 | non-performance adjustment |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivatives embedded in fixed indexed annuity products, measurement input | 5 |
market comparable | Fair Value, Inputs, Level 3 | price/book ExAOCI |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Equity securities, measurement input | 1.06 |
black-scholes | Fair Value, Inputs, Level 3 | time to exit |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Equity securities, measurement input | 2.67 |
Minimum | discounted cash flow | Fair Value, Inputs, Level 3 | option budget |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivatives embedded in fixed indexed annuity products, measurement input | 0.0090 |
Minimum | black-scholes | Fair Value, Inputs, Level 3 | volatility |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Equity securities, measurement input | 0.280 |
Maximum | discounted cash flow | Fair Value, Inputs, Level 3 | option budget |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivatives embedded in fixed indexed annuity products, measurement input | 0.0340 |
Maximum | black-scholes | Fair Value, Inputs, Level 3 | volatility |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Equity securities, measurement input | 0.440 |
Municipal bonds | Fair Value |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value |  | 1,703.4
Municipal bonds | Fair Value, Inputs, Level 3 | Fair Value |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 54.4 | 60.8
Municipal bonds | Minimum | discounted cash flow | Fair Value, Inputs, Level 3 | option adjusted spread |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, measurement input | 0.0308 |
Corporate bonds | Fair Value |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value |  | 2,388.7
Corporate bonds | Fair Value, Inputs, Level 3 | Fair Value |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 261.3 | $ 210.3
Corporate bonds | discounted cash flow | Fair Value, Inputs, Level 3 | option adjusted spread |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, measurement input | 241 |
Corporate bonds | discounted cash flow | Fair Value, Inputs, Level 3 | exit cap rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, measurement input | 0.062 |
Corporate bonds | vendor priced | Fair Value, Inputs, Level 3 | vendor priced |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, measurement input | 0.00796 |
Corporate bonds | market comparable | Fair Value, Inputs, Level 3 | EV / Fwd EBITDA (x) |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, measurement input | 5.92 |
Corporate bonds | Minimum | discounted cash flow | Fair Value, Inputs, Level 3 | yield |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, measurement input | 0.061 |
Corporate bonds | Minimum | discounted cash flow | Fair Value, Inputs, Level 3 | discount rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, measurement input | 0.062 |
Corporate bonds | Maximum | discounted cash flow | Fair Value, Inputs, Level 3 | yield |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, measurement input | 0.110 |
Corporate bonds | Maximum | discounted cash flow | Fair Value, Inputs, Level 3 | discount rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, measurement input | 0.107 |
Mortgage-backed and other asset-backed securities | Fair Value, Inputs, Level 3 | Fair Value |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 107.6 |
Mortgage-backed and other asset-backed securities | discounted cash flow | Fair Value, Inputs, Level 3 | London Interbank Offered Rate (LIBOR) |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, measurement input | 0.023 |
Mortgage-backed and other asset-backed securities | discounted cash flow | Fair Value, Inputs, Level 3 | discount margin |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, measurement input | 0.395 |
Mortgage-backed and other asset-backed securities | discounted cash flow | Fair Value, Inputs, Level 3 | PDI spread |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, measurement input | 0.055 |
Mortgage-backed and other asset-backed securities | discounted cash flow | Fair Value, Inputs, Level 3 | SBL spread |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, measurement input | 0.045 |
Mortgage-backed and other asset-backed securities | discounted cash flow | Fair Value, Inputs, Level 3 | CPR |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, measurement input | 0.200 |
Mortgage-backed and other asset-backed securities | discounted cash flow | Fair Value, Inputs, Level 3 | default rate annual |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, measurement input | 0.040 |
Mortgage-backed and other asset-backed securities | discounted cash flow | Fair Value, Inputs, Level 3 | recovery |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, measurement input | 0.650 |
Mortgage-backed and other asset-backed securities | discounted cash flow | Fair Value, Inputs, Level 3 | I spread |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, measurement input | 0.0175 |
Mortgage-backed and other asset-backed securities | discounted cash flow | Fair Value, Inputs, Level 3 | N spread |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, measurement input | 0.0463 |
Mortgage-backed and other asset-backed securities | discounted cash flow | Fair Value, Inputs, Level 3 | T spread |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, measurement input | 0.0226 |
Mortgage-backed and other asset-backed securities | market comparable | Fair Value, Inputs, Level 3 | median price |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, measurement input | 81.34 |
Mortgage-backed and other asset-backed securities | Minimum | discounted cash flow | Fair Value, Inputs, Level 3 | yield |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, measurement input | 0.064 |
Mortgage-backed and other asset-backed securities | Minimum | discounted cash flow | Fair Value, Inputs, Level 3 | discount rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, measurement input | 0.160 |
Mortgage-backed and other asset-backed securities | Minimum | discounted cash flow | Fair Value, Inputs, Level 3 | median comparable yield |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, measurement input | 0.207 |
Mortgage-backed and other asset-backed securities | Minimum | discounted cash flow | Fair Value, Inputs, Level 3 | weighting |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, measurement input | 0.170 |
Mortgage-backed and other asset-backed securities | Minimum | vendor priced | Fair Value, Inputs, Level 3 | haircut |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, measurement input | 0.0001 |
Mortgage-backed and other asset-backed securities | Maximum | discounted cash flow | Fair Value, Inputs, Level 3 | yield |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, measurement input | 0.065 |
Mortgage-backed and other asset-backed securities | Maximum | discounted cash flow | Fair Value, Inputs, Level 3 | discount rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, measurement input | 0.210 |
Mortgage-backed and other asset-backed securities | Maximum | discounted cash flow | Fair Value, Inputs, Level 3 | median comparable yield |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, measurement input | 0.432 |
Mortgage-backed and other asset-backed securities | Maximum | discounted cash flow | Fair Value, Inputs, Level 3 | weighting |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, measurement input | 0.830 |
Mortgage-backed and other asset-backed securities | Maximum | vendor priced | Fair Value, Inputs, Level 3 | haircut |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, measurement input | 0.003 |

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