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Fair Value of Financial Instruments - Financial Instruments Measured and Carried at Fair Value (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Financial Assets |  |
Total fixed maturity securities | $ 5,573.2 | $ 5,235.3
Equity securities | 88.9 | 86.2
Mortgage-backed securities |  |
Financial Assets |  |
Total fixed maturity securities | 728.3 | 653.2
Other, including U.S. Treasury securities |  |
Financial Assets |  |
Total fixed maturity securities | 385.7 | 388.8
Municipal bonds |  |
Financial Assets |  |
Total fixed maturity securities | 1,215.7 | 1,270.1
Foreign government bonds |  |
Financial Assets |  |
Total fixed maturity securities | 16.5 | 22.1
Corporate bonds |  |
Financial Assets |  |
Total fixed maturity securities | 1,944.5 | 1,772.7
Other asset-backed securities |  |
Financial Assets |  |
Total fixed maturity securities | 1,282.5 | 1,128.4
Carrying Amount | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 5,573.2 | 5,235.3
Equity securities | 88.9 | 86.2
Short-term investments | 91.6 | 132.9
Other investments | 22.5 | 19.0
Totals | 5,776.2 | 5,473.4
Separate Account variable annuity assets | 3,732.8 | 3,294.1
Financial Liabilities | 86.1 | 86.0
Carrying Amount | Recurring | Mortgage-backed securities |  |
Financial Assets |  |
Total fixed maturity securities | 728.3 | 653.2
Carrying Amount | Recurring | Other, including U.S. Treasury securities |  |
Financial Assets |  |
Total fixed maturity securities | 385.7 | 388.8
Carrying Amount | Recurring | Municipal bonds |  |
Financial Assets |  |
Total fixed maturity securities | 1,215.7 | 1,270.1
Carrying Amount | Recurring | Foreign government bonds |  |
Financial Assets |  |
Total fixed maturity securities | 16.5 | 22.1
Carrying Amount | Recurring | Corporate bonds |  |
Financial Assets |  |
Total fixed maturity securities | 1,944.5 | 1,772.7
Carrying Amount | Recurring | Other asset-backed securities |  |
Financial Assets |  |
Total fixed maturity securities | 1,282.5 | 1,128.4
Fair Value | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 5,573.2 | 5,235.3
Equity securities | 88.9 | 86.2
Short-term investments | 91.6 | 132.9
Other investments | 22.5 | 19.0
Totals | 5,776.2 | 5,473.4
Separate Account variable annuity assets | 3,732.8 | 3,294.1
Financial Liabilities | 86.1 | 86.0
Fair Value | Recurring | Level 1 |  |
Financial Assets |  |
Total fixed maturity securities | 33.5 | 55.7
Equity securities | 19.5 | 17.9
Short-term investments | 91.6 | 132.9
Other investments | 0.0 | 0.0
Totals | 144.6 | 206.5
Separate Account variable annuity assets | 3,732.8 | 3,294.1
Financial Liabilities | 0.0 | 0.0
Fair Value | Recurring | Level 2 |  |
Financial Assets |  |
Total fixed maturity securities | 4,995.6 | 4,665.6
Equity securities | 65.4 | 63.8
Short-term investments | 0.0 | 0.0
Other investments | 22.5 | 19.0
Totals | 5,083.5 | 4,748.4
Separate Account variable annuity assets | 0.0 | 0.0
Financial Liabilities | 5.0 | 3.6
Fair Value | Recurring | Level 3 |  |
Financial Assets |  |
Total fixed maturity securities | 544.1 | 514.0
Equity securities | 4.0 | 4.5
Short-term investments | 0.0 | 0.0
Other investments | 0.0 | 0.0
Totals | 548.1 | 518.5
Separate Account variable annuity assets | 0.0 | 0.0
Financial Liabilities | 81.1 | 82.4
Fair Value | Recurring | Mortgage-backed securities |  |
Financial Assets |  |
Total fixed maturity securities | 728.3 | 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 | 728.3 | 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 | 385.7 | 388.8
Fair Value | Recurring | Other, including U.S. Treasury securities | Level 1 |  |
Financial Assets |  |
Total fixed maturity securities | 25.3 | 45.6
Fair Value | Recurring | Other, including U.S. Treasury securities | Level 2 |  |
Financial Assets |  |
Total fixed maturity securities | 360.4 | 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 | 1,215.7 | 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 | 1,139.1 | 1,196.1
Fair Value | Recurring | Municipal bonds | Level 3 |  |
Financial Assets |  |
Total fixed maturity securities | 76.6 | 74.0
Fair Value | Recurring | Foreign government bonds |  |
Financial Assets |  |
Total fixed maturity securities | 16.5 | 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 | 16.5 | 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 | 1,944.5 | 1,772.7
Fair Value | Recurring | Corporate bonds | Level 1 |  |
Financial Assets |  |
Total fixed maturity securities | 8.2 | 10.1
Fair Value | Recurring | Corporate bonds | Level 2 |  |
Financial Assets |  |
Total fixed maturity securities | 1,553.5 | 1,420.1
Fair Value | Recurring | Corporate bonds | Level 3 |  |
Financial Assets |  |
Total fixed maturity securities | 382.8 | 342.5
Fair Value | Recurring | Other asset-backed securities |  |
Financial Assets |  |
Total fixed maturity securities | 1,282.5 | 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 | 1,197.8 | 1,030.9
Fair Value | Recurring | Other asset-backed securities | Level 3 |  |
Financial Assets |  |
Total fixed maturity securities | $ 84.7 | $ 97.5

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