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Fair Value of Financial Instruments - Financial Instruments Measured and Carried at Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Financial Assets |  |  |
Total fixed maturity securities | $ 5,235.3 | $ 5,185.0 | [1]
Equity securities | 86.2 | 99.6 | [1]
Carrying Value | Recurring |  |  |
Financial Assets |  |  |
Total fixed maturity securities | 5,235.3 | 5,185.0 |
Equity securities | 86.2 | 99.6 |
Short-term investments | 132.9 | 109.4 |
Other investments | 19.0 | 38.6 |
Investments, Fair Value Disclosure, Total | 5,473.4 | 5,432.6 |
Separate account (variable annuity) assets | 3,294.1 | 2,792.3 |
Financial Liabilities | 86.0 | 92.5 |
Carrying Value | Mortgage-backed securities | Recurring |  |  |
Financial Assets |  |  |
Total fixed maturity securities | 653.2 | 570.4 |
Carrying Value | Other, including U.S. Treasury securities | Recurring |  |  |
Financial Assets |  |  |
Total fixed maturity securities | 388.8 | 342.6 |
Carrying Value | Municipal bonds | Recurring |  |  |
Financial Assets |  |  |
Total fixed maturity securities | 1,270.1 | 1,269.7 |
Carrying Value | Foreign government bonds | Recurring |  |  |
Financial Assets |  |  |
Total fixed maturity securities | 22.1 | 33.6 |
Carrying Value | Corporate bonds | Recurring |  |  |
Financial Assets |  |  |
Total fixed maturity securities | 1,772.7 | 1,901.7 |
Carrying Value | Other asset-backed securities | Recurring |  |  |
Financial Assets |  |  |
Total fixed maturity securities | 1,128.4 | 1,067.0 |
Fair Value | Recurring |  |  |
Financial Assets |  |  |
Total fixed maturity securities | 5,235.3 | 5,185.0 |
Equity securities | 86.2 | 99.6 |
Short-term investments | 132.9 | 109.4 |
Other investments | 19.0 | 38.6 |
Investments, Fair Value Disclosure, Total | 5,473.4 | 5,432.6 |
Separate account (variable annuity) assets | 3,294.1 | 2,792.3 |
Financial Liabilities | 86.0 | 92.5 |
Fair Value | Level 1 | Recurring |  |  |
Financial Assets |  |  |
Total fixed maturity securities | 55.7 | 36.8 |
Equity securities | 17.9 | 23.3 |
Short-term investments | 132.9 | 109.4 |
Other investments | 0.0 | 0.0 |
Investments, Fair Value Disclosure, Total | 206.5 | 169.5 |
Separate account (variable annuity) assets | 3,294.1 | 2,792.3 |
Financial Liabilities | 0.0 | 0.0 |
Fair Value | Level 2 | Recurring |  |  |
Financial Assets |  |  |
Total fixed maturity securities | 4,665.6 | 4,724.9 |
Equity securities | 63.8 | 74.3 |
Short-term investments | 0.0 | 0.0 |
Other investments | 19.0 | 38.6 |
Investments, Fair Value Disclosure, Total | 4,748.4 | 4,837.8 |
Separate account (variable annuity) assets | 0.0 | 0.0 |
Financial Liabilities | 3.6 | 1.2 |
Fair Value | Level 3 | Recurring |  |  |
Financial Assets |  |  |
Total fixed maturity securities | 514.0 | 423.3 |
Equity securities | 4.5 | 2.0 |
Short-term investments | 0.0 | 0.0 |
Other investments | 0.0 | 0.0 |
Investments, Fair Value Disclosure, Total | 518.5 | 425.3 |
Separate account (variable annuity) assets | 0.0 | 0.0 |
Financial Liabilities | 82.4 | 91.3 |
Fair Value | Mortgage-backed securities | Recurring |  |  |
Financial Assets |  |  |
Total fixed maturity securities | 653.2 | 570.4 |
Fair Value | Mortgage-backed securities | Level 1 | Recurring |  |  |
Financial Assets |  |  |
Total fixed maturity securities | 0.0 | 0.0 |
Fair Value | Mortgage-backed securities | Level 2 | Recurring |  |  |
Financial Assets |  |  |
Total fixed maturity securities | 653.2 | 567.8 |
Fair Value | Mortgage-backed securities | Level 3 | Recurring |  |  |
Financial Assets |  |  |
Total fixed maturity securities | 0.0 | 2.6 |
Fair Value | Other, including U.S. Treasury securities | Recurring |  |  |
Financial Assets |  |  |
Total fixed maturity securities | 388.8 | 342.6 |
Fair Value | Other, including U.S. Treasury securities | Level 1 | Recurring |  |  |
Financial Assets |  |  |
Total fixed maturity securities | 45.6 | 24.6 |
Fair Value | Other, including U.S. Treasury securities | Level 2 | Recurring |  |  |
Financial Assets |  |  |
Total fixed maturity securities | 343.2 | 318.0 |
Fair Value | Other, including U.S. Treasury securities | Level 3 | Recurring |  |  |
Financial Assets |  |  |
Total fixed maturity securities | 0.0 | 0.0 |
Fair Value | Municipal bonds | Recurring |  |  |
Financial Assets |  |  |
Total fixed maturity securities | 1,270.1 | 1,269.7 |
Fair Value | Municipal bonds | Level 1 | Recurring |  |  |
Financial Assets |  |  |
Total fixed maturity securities | 0.0 | 0.0 |
Fair Value | Municipal bonds | Level 2 | Recurring |  |  |
Financial Assets |  |  |
Total fixed maturity securities | 1,196.1 | 1,215.3 |
Fair Value | Municipal bonds | Level 3 | Recurring |  |  |
Financial Assets |  |  |
Total fixed maturity securities | 74.0 | 54.4 |
Fair Value | Foreign government bonds | Recurring |  |  |
Financial Assets |  |  |
Total fixed maturity securities | 22.1 | 33.6 |
Fair Value | Foreign government bonds | Level 1 | Recurring |  |  |
Financial Assets |  |  |
Total fixed maturity securities | 0.0 | 0.0 |
Fair Value | Foreign government bonds | Level 2 | Recurring |  |  |
Financial Assets |  |  |
Total fixed maturity securities | 22.1 | 33.6 |
Fair Value | Foreign government bonds | Level 3 | Recurring |  |  |
Financial Assets |  |  |
Total fixed maturity securities | 0.0 | 0.0 |
Fair Value | Corporate bonds | Recurring |  |  |
Financial Assets |  |  |
Total fixed maturity securities | 1,772.7 | 1,901.7 |
Fair Value | Corporate bonds | Level 1 | Recurring |  |  |
Financial Assets |  |  |
Total fixed maturity securities | 10.1 | 12.2 |
Fair Value | Corporate bonds | Level 2 | Recurring |  |  |
Financial Assets |  |  |
Total fixed maturity securities | 1,420.1 | 1,628.2 |
Fair Value | Corporate bonds | Level 3 | Recurring |  |  |
Financial Assets |  |  |
Total fixed maturity securities | 342.5 | 261.3 |
Fair Value | Other asset-backed securities | Recurring |  |  |
Financial Assets |  |  |
Total fixed maturity securities | 1,128.4 | 1,067.0 |
Fair Value | Other asset-backed securities | Level 1 | Recurring |  |  |
Financial Assets |  |  |
Total fixed maturity securities | 0.0 | 0.0 |
Fair Value | Other asset-backed securities | Level 2 | Recurring |  |  |
Financial Assets |  |  |
Total fixed maturity securities | 1,030.9 | 962.0 |
Fair Value | Other asset-backed securities | Level 3 | Recurring |  |  |
Financial Assets |  |  |
Total fixed maturity securities | $ 97.5 | $ 105.0 |
[1] | Recast for the adoption of ASU 2018-12. See Note 1 of the Consolidated Financial Statements

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