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Fair Value of Financial Instruments - Financial Instruments Measured and Carried at Fair Value (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Financial Assets |  |
Total fixed maturity securities | $ 5,342.7 | $ 5,235.3
Equity securities | 84.7 | 86.2
Mortgage-backed securities |  |
Financial Assets |  |
Total fixed maturity securities | 677.7 | 653.2
Other, including U.S. Treasury securities |  |
Financial Assets |  |
Total fixed maturity securities | 391.2 | 388.8
Municipal bonds |  |
Financial Assets |  |
Total fixed maturity securities | 1,207.5 | 1,270.1
Foreign government bonds |  |
Financial Assets |  |
Total fixed maturity securities | 21.9 | 22.1
Corporate bonds |  |
Financial Assets |  |
Total fixed maturity securities | 1,829.9 | 1,772.7
Other asset-backed securities |  |
Financial Assets |  |
Total fixed maturity securities | 1,214.5 | 1,128.4
Carrying Amount | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 5,342.7 | 5,235.3
Equity securities | 84.7 | 86.2
Short-term investments | 69.4 | 132.9
Other investments | 23.1 | 19.0
Totals | 5,519.9 | 5,473.4
Separate Account variable annuity assets | 3,516.9 | 3,294.1
Financial Liabilities | 85.0 | 86.0
Carrying Amount | Recurring | Mortgage-backed securities |  |
Financial Assets |  |
Total fixed maturity securities | 677.7 | 653.2
Carrying Amount | Recurring | Other, including U.S. Treasury securities |  |
Financial Assets |  |
Total fixed maturity securities | 391.2 | 388.8
Carrying Amount | Recurring | Municipal bonds |  |
Financial Assets |  |
Total fixed maturity securities | 1,207.5 | 1,270.1
Carrying Amount | Recurring | Foreign government bonds |  |
Financial Assets |  |
Total fixed maturity securities | 21.9 | 22.1
Carrying Amount | Recurring | Corporate bonds |  |
Financial Assets |  |
Total fixed maturity securities | 1,829.9 | 1,772.7
Carrying Amount | Recurring | Other asset-backed securities |  |
Financial Assets |  |
Total fixed maturity securities | 1,214.5 | 1,128.4
Fair Value | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 5,342.7 | 5,235.3
Equity securities | 84.7 | 86.2
Short-term investments | 69.4 | 132.9
Other investments | 23.1 | 19.0
Totals | 5,519.9 | 5,473.4
Separate Account variable annuity assets | 3,516.9 | 3,294.1
Financial Liabilities | 85.0 | 86.0
Fair Value | Recurring | Level 1 |  |
Financial Assets |  |
Total fixed maturity securities | 53.6 | 55.7
Equity securities | 18.1 | 17.9
Short-term investments | 69.4 | 132.9
Other investments | 0.0 | 0.0
Totals | 141.1 | 206.5
Separate Account variable annuity assets | 3,516.9 | 3,294.1
Financial Liabilities | 0.0 | 0.0
Fair Value | Recurring | Level 2 |  |
Financial Assets |  |
Total fixed maturity securities | 4,781.7 | 4,665.6
Equity securities | 64.1 | 63.8
Short-term investments | 0.0 | 0.0
Other investments | 23.1 | 19.0
Totals | 4,868.9 | 4,748.4
Separate Account variable annuity assets | 0.0 | 0.0
Financial Liabilities | 4.2 | 3.6
Fair Value | Recurring | Level 3 |  |
Financial Assets |  |
Total fixed maturity securities | 507.4 | 514.0
Equity securities | 2.5 | 4.5
Short-term investments | 0.0 | 0.0
Other investments | 0.0 | 0.0
Totals | 509.9 | 518.5
Separate Account variable annuity assets | 0.0 | 0.0
Financial Liabilities | 80.8 | 82.4
Fair Value | Recurring | Mortgage-backed securities |  |
Financial Assets |  |
Total fixed maturity securities | 677.7 | 653.2
Fair Value | Recurring | Mortgage-backed securities | Level 1 |  |
Financial Assets |  |
Total fixed maturity securities | 0.0 | 0.0
Fair Value | Recurring | Mortgage-backed securities | Level 2 |  |
Financial Assets |  |
Total fixed maturity securities | 677.7 | 653.2
Fair Value | Recurring | Mortgage-backed securities | Level 3 |  |
Financial Assets |  |
Total fixed maturity securities | 0.0 | 0.0
Fair Value | Recurring | Other, including U.S. Treasury securities |  |
Financial Assets |  |
Total fixed maturity securities | 391.2 | 388.8
Fair Value | Recurring | Other, including U.S. Treasury securities | Level 1 |  |
Financial Assets |  |
Total fixed maturity securities | 45.0 | 45.6
Fair Value | Recurring | Other, including U.S. Treasury securities | Level 2 |  |
Financial Assets |  |
Total fixed maturity securities | 346.2 | 343.2
Fair Value | Recurring | Other, including U.S. Treasury securities | Level 3 |  |
Financial Assets |  |
Total fixed maturity securities | 0.0 | 0.0
Fair Value | Recurring | Municipal bonds |  |
Financial Assets |  |
Total fixed maturity securities | 1,207.5 | 1,270.1
Fair Value | Recurring | Municipal bonds | Level 1 |  |
Financial Assets |  |
Total fixed maturity securities | 0.0 | 0.0
Fair Value | Recurring | Municipal bonds | Level 2 |  |
Financial Assets |  |
Total fixed maturity securities | 1,134.3 | 1,196.1
Fair Value | Recurring | Municipal bonds | Level 3 |  |
Financial Assets |  |
Total fixed maturity securities | 73.2 | 74.0
Fair Value | Recurring | Foreign government bonds |  |
Financial Assets |  |
Total fixed maturity securities | 21.9 | 22.1
Fair Value | Recurring | Foreign government bonds | Level 1 |  |
Financial Assets |  |
Total fixed maturity securities | 0.0 | 0.0
Fair Value | Recurring | Foreign government bonds | Level 2 |  |
Financial Assets |  |
Total fixed maturity securities | 21.9 | 22.1
Fair Value | Recurring | Foreign government bonds | Level 3 |  |
Financial Assets |  |
Total fixed maturity securities | 0.0 | 0.0
Fair Value | Recurring | Corporate bonds |  |
Financial Assets |  |
Total fixed maturity securities | 1,829.9 | 1,772.7
Fair Value | Recurring | Corporate bonds | Level 1 |  |
Financial Assets |  |
Total fixed maturity securities | 8.6 | 10.1
Fair Value | Recurring | Corporate bonds | Level 2 |  |
Financial Assets |  |
Total fixed maturity securities | 1,475.8 | 1,420.1
Fair Value | Recurring | Corporate bonds | Level 3 |  |
Financial Assets |  |
Total fixed maturity securities | 345.5 | 342.5
Fair Value | Recurring | Other asset-backed securities |  |
Financial Assets |  |
Total fixed maturity securities | 1,214.5 | 1,128.4
Fair Value | Recurring | Other asset-backed securities | Level 1 |  |
Financial Assets |  |
Total fixed maturity securities | 0.0 | 0.0
Fair Value | Recurring | Other asset-backed securities | Level 2 |  |
Financial Assets |  |
Total fixed maturity securities | 1,125.8 | 1,030.9
Fair Value | Recurring | Other asset-backed securities | Level 3 |  |
Financial Assets |  |
Total fixed maturity securities | $ 88.7 | $ 97.5

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