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Fair Value of Financial Instruments - Quantitative Information about Level 3 Fair Value Measurements (Details) $ in Millions | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
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Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2023, $5,652.9; 2022, $5,756.9) | $ 5,235.3 | $ 5,185.0 | [1] |  |
Equity securities at fair value, (cost $86.2 and $99.6) | 86.2 | 99.6 | [1] |  |
Net MRBs | (3.9) | 0.3 |  | $ 4.8 | $ 8.6
Fair Value | Recurring |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2023, $5,652.9; 2022, $5,756.9) | 5,235.3 | 5,185.0 |  |  |
Equity securities at fair value, (cost $86.2 and $99.6) | 86.2 | 99.6 |  |  |
Financial Liabilities | 86.0 | 92.5 |  |  |
Mortgage-backed securities | Fair Value | Recurring |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2023, $5,652.9; 2022, $5,756.9) | 653.2 | 570.4 |  |  |
Municipal bonds | Fair Value | Recurring |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2023, $5,652.9; 2022, $5,756.9) | 1,270.1 | 1,269.7 |  |  |
Corporate bonds | Fair Value | Recurring |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2023, $5,652.9; 2022, $5,756.9) | 1,772.7 | 1,901.7 |  |  |
Other asset-backed securities | Fair Value | Recurring |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2023, $5,652.9; 2022, $5,756.9) | 1,128.4 | 1,067.0 |  |  |
Fair Value, Inputs, Level 3 | Fair Value | Recurring |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2023, $5,652.9; 2022, $5,756.9) | 514.0 | 423.3 |  |  |
Equity securities at fair value, (cost $86.2 and $99.6) | 4.5 | 2.0 |  |  |
Totals | 518.5 | 425.3 |  |  |
Financial Liabilities | 82.4 | 91.3 |  |  |
Derivatives embedded in fixed indexed annuity products | 86.3 | 91.0 |  |  |
Net MRBs | (3.9) | 0.3 |  |  |
Fair Value, Inputs, Level 3 | Fair Value | Recurring | Internal |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2023, $5,652.9; 2022, $5,756.9) | 180.4 | 9.5 |  |  |
Equity securities at fair value, (cost $86.2 and $99.6) | 0.0 | 0.0 |  |  |
Totals | 180.4 | 9.5 |  |  |
Financial Liabilities | 82.4 | 91.3 |  |  |
Fair Value, Inputs, Level 3 | Fair Value | Recurring | External |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2023, $5,652.9; 2022, $5,756.9) | 333.6 | 413.8 |  |  |
Equity securities at fair value, (cost $86.2 and $99.6) | 4.5 | 2.0 |  |  |
Totals | 338.1 | 415.8 |  |  |
Financial Liabilities | 0.0 | 0.0 |  |  |
Fair Value, Inputs, Level 3 | Mortgage-backed securities | Fair Value | Recurring |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2023, $5,652.9; 2022, $5,756.9) | 0.0 | 2.6 |  |  |
Fair Value, Inputs, Level 3 | Mortgage-backed securities | Fair Value | Recurring | Internal |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2023, $5,652.9; 2022, $5,756.9) | 0.0 | 0.0 |  |  |
Fair Value, Inputs, Level 3 | Mortgage-backed securities | Fair Value | Recurring | External |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2023, $5,652.9; 2022, $5,756.9) | 0.0 | 2.6 |  |  |
Fair Value, Inputs, Level 3 | Municipal bonds | Fair Value | Recurring |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2023, $5,652.9; 2022, $5,756.9) | 74.0 | 54.4 |  |  |
Fair Value, Inputs, Level 3 | Municipal bonds | Fair Value | Recurring | Internal |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2023, $5,652.9; 2022, $5,756.9) | 0.0 | 0.0 |  |  |
Fair Value, Inputs, Level 3 | Municipal bonds | Fair Value | Recurring | External |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2023, $5,652.9; 2022, $5,756.9) | 74.0 | 54.4 |  |  |
Fair Value, Inputs, Level 3 | Corporate bonds | Fair Value | Recurring |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2023, $5,652.9; 2022, $5,756.9) | 342.5 | 261.3 |  |  |
Fair Value, Inputs, Level 3 | Corporate bonds | Fair Value | Recurring | Internal |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2023, $5,652.9; 2022, $5,756.9) | 180.4 | 9.5 |  |  |
Fair Value, Inputs, Level 3 | Corporate bonds | Fair Value | Recurring | External |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2023, $5,652.9; 2022, $5,756.9) | 162.1 | $ 251.8 |  |  |
Fair Value, Inputs, Level 3 | Corporate bonds | discounted cash flow | yield |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |
Debt securities, measurement input |  | 6.8 |  |  |
Fair Value, Inputs, Level 3 | Other asset-backed securities | Fair Value | Recurring |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2023, $5,652.9; 2022, $5,756.9) | 97.5 | $ 105.0 |  |  |
Fair Value, Inputs, Level 3 | Other asset-backed securities | Fair Value | Recurring | Internal |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2023, $5,652.9; 2022, $5,756.9) | 0.0 | 0.0 |  |  |
Fair Value, Inputs, Level 3 | Other asset-backed securities | Fair Value | Recurring | External |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2023, $5,652.9; 2022, $5,756.9) | $ 97.5 | $ 105.0 |  |  |
Minimum | Fair Value, Inputs, Level 3 | discounted cash flow | Measurement Input Option Budget [Member] |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |
Derivatives embedded in fixed indexed annuity products, measurement input | 0.009 | 0.009 |  |  |
Minimum | Fair Value, Inputs, Level 3 | Corporate bonds | discounted cash flow | yield |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |
Debt securities, measurement input | 0.067 |  |  |  |
Maximum | Fair Value, Inputs, Level 3 | discounted cash flow | Measurement Input Option Budget [Member] |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |
Derivatives embedded in fixed indexed annuity products, measurement input | 0.038 | 0.034 |  |  |
Maximum | Fair Value, Inputs, Level 3 | Corporate bonds | discounted cash flow | yield |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |
Debt securities, measurement input | 0.170 |  |  |  |
Weighted Average | Fair Value, Inputs, Level 3 | discounted cash flow | lapse rate |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |
Derivatives embedded in fixed indexed annuity products, measurement input | 0.059 | 0.054 |  |  |
Net MRBs, measurement input | 0.059 | 0.053 |  |  |
Weighted Average | Fair Value, Inputs, Level 3 | discounted cash flow | mortality multiplier |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |
Derivatives embedded in fixed indexed annuity products, measurement input | 0.694 | 0.678 |  |  |
Net MRBs, measurement input | 0.678 | 0.678 |  |  |
Weighted Average | Fair Value, Inputs, 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 | 0.050 |  |  |
[1] | Recast for the adoption of ASU 2018-12. See Note 1 of the Consolidated Financial Statements

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