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Fair Value of Financial Instruments - Financial Instruments Measured and Carried at Fair Value (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Financial Assets |  |
Total fixed maturity securities | $ 5,272.1 | $ 6,239.3
Equity securities | 113.8 | 147.2
Mortgage-backed securities |  |
Financial Assets |  |
Total fixed maturity securities | 579.1 | 662.5
Other, including U.S. Treasury securities |  |
Financial Assets |  |
Total fixed maturity securities | 342.7 | 365.9
Municipal bonds |  |
Financial Assets |  |
Total fixed maturity securities | 1,307.9 | 1,703.4
Foreign government bonds |  |
Financial Assets |  |
Total fixed maturity securities | 35.5 | 43.6
Corporate bonds |  |
Financial Assets |  |
Total fixed maturity securities | 1,927.8 | 2,388.7
Other asset-backed securities |  |
Financial Assets |  |
Total fixed maturity securities | 1,079.1 | 1,075.2
Carrying Amount |  |
Financial Assets |  |
Equity securities | 113.8 | 147.2
Short-term investments | 51.4 | 157.8
Other investments | 34.0 | 43.6
Totals | 5,471.3 | 6,587.9
Separate Account variable annuity assets | 2,599.6 | 3,441.0
Financial Liabilities |  |
Investment contract and policy reserves, embedded derivatives | 0.4 | 2.1
Other policyholder funds, embedded derivatives | 89.9 | 106.6
Carrying Amount | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 5,272.1 | 6,239.3
Carrying Amount | Mortgage-backed securities |  |
Financial Assets |  |
Total fixed maturity securities | 579.1 | 662.5
Carrying Amount | Other, including U.S. Treasury securities |  |
Financial Assets |  |
Total fixed maturity securities | 342.8 | 365.9
Carrying Amount | Municipal bonds |  |
Financial Assets |  |
Total fixed maturity securities | 1,307.9 | 1,703.4
Carrying Amount | Foreign government bonds |  |
Financial Assets |  |
Total fixed maturity securities | 35.4 | 43.6
Carrying Amount | Corporate bonds |  |
Financial Assets |  |
Total fixed maturity securities | 1,927.8 | 2,388.7
Carrying Amount | Other asset-backed securities |  |
Financial Assets |  |
Total fixed maturity securities | 1,079.1 | 1,075.2
Fair Value |  |
Financial Assets |  |
Equity securities | 113.8 | 147.2
Short-term investments | 51.4 | 157.8
Other investments | 34.0 | 43.6
Totals | 5,471.3 | 6,587.9
Separate Account variable annuity assets | 2,599.6 | 3,441.0
Financial Liabilities |  |
Investment contract and policy reserves, embedded derivatives | 0.4 | 2.1
Other policyholder funds, embedded derivatives | 89.9 | 106.6
Fair Value | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 5,272.1 | 6,239.3
Fair Value | Mortgage-backed securities |  |
Financial Assets |  |
Total fixed maturity securities | 579.1 | 662.5
Fair Value | Other, including U.S. Treasury securities |  |
Financial Assets |  |
Total fixed maturity securities | 342.7 | 365.9
Fair Value | Municipal bonds |  |
Financial Assets |  |
Total fixed maturity securities | 1,307.9 | 1,703.4
Fair Value | Foreign government bonds |  |
Financial Assets |  |
Total fixed maturity securities | 35.5 | 43.6
Fair Value | Corporate bonds |  |
Financial Assets |  |
Total fixed maturity securities | 1,927.8 | 2,388.7
Fair Value | Other asset-backed securities |  |
Financial Assets |  |
Total fixed maturity securities | 1,079.1 | 1,075.2
Fair Value | Level 1 |  |
Financial Assets |  |
Equity securities | 22.4 | 35.2
Short-term investments | 49.0 | 157.8
Other investments | 0.0 | 0.0
Totals | 108.7 | 225.6
Separate Account variable annuity assets | 2,599.6 | 3,441.0
Financial Liabilities |  |
Investment contract and policy reserves, embedded derivatives | 0.0 | 0.0
Other policyholder funds, embedded derivatives | 0.0 | 0.0
Fair Value | Level 1 | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 37.3 | 32.6
Fair Value | Level 1 | Mortgage-backed securities |  |
Financial Assets |  |
Total fixed maturity securities | 0.0 | 0.0
Fair Value | Level 1 | Other, including U.S. Treasury securities |  |
Financial Assets |  |
Total fixed maturity securities | 24.5 | 17.7
Fair Value | Level 1 | Municipal bonds |  |
Financial Assets |  |
Total fixed maturity securities | 0.0 | 0.0
Fair Value | Level 1 | Foreign government bonds |  |
Financial Assets |  |
Total fixed maturity securities | 0.0 | 0.0
Fair Value | Level 1 | Corporate bonds |  |
Financial Assets |  |
Total fixed maturity securities | 12.8 | 14.9
Fair Value | Level 1 | Other asset-backed securities |  |
Financial Assets |  |
Total fixed maturity securities | 0.0 | 0.0
Fair Value | Level 2 |  |
Financial Assets |  |
Equity securities | 89.4 | 110.6
Short-term investments | 2.4 | 0.0
Other investments | 34.0 | 43.6
Totals | 4,960.3 | 5,990.9
Separate Account variable annuity assets | 0.0 | 0.0
Financial Liabilities |  |
Investment contract and policy reserves, embedded derivatives | 0.4 | 2.1
Other policyholder funds, embedded derivatives | 0.0 | 0.0
Fair Value | Level 2 | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 4,834.5 | 5,836.7
Fair Value | Level 2 | Mortgage-backed securities |  |
Financial Assets |  |
Total fixed maturity securities | 576.5 | 662.5
Fair Value | Level 2 | Other, including U.S. Treasury securities |  |
Financial Assets |  |
Total fixed maturity securities | 318.2 | 348.2
Fair Value | Level 2 | Municipal bonds |  |
Financial Assets |  |
Total fixed maturity securities | 1,254.6 | 1,642.6
Fair Value | Level 2 | Foreign government bonds |  |
Financial Assets |  |
Total fixed maturity securities | 35.5 | 43.6
Fair Value | Level 2 | Corporate bonds |  |
Financial Assets |  |
Total fixed maturity securities | 1,675.2 | 2,163.5
Fair Value | Level 2 | Other asset-backed securities |  |
Financial Assets |  |
Total fixed maturity securities | 974.5 | 976.3
Fair Value | Level 3 |  |
Financial Assets |  |
Equity securities | 2.0 | 1.4
Short-term investments | 0.0 | 0.0
Other investments | 0.0 | 0.0
Totals | 402.3 | 371.4
Separate Account variable annuity assets | 0.0 | 0.0
Financial Liabilities |  |
Investment contract and policy reserves, embedded derivatives | 0.0 | 0.0
Other policyholder funds, embedded derivatives | 89.9 | 106.6
Fair Value | Level 3 | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 400.3 | 370.0
Fair Value | Level 3 | Mortgage-backed securities |  |
Financial Assets |  |
Total fixed maturity securities | 2.6 | 0.0
Fair Value | Level 3 | Other, including U.S. Treasury securities |  |
Financial Assets |  |
Total fixed maturity securities | 0.0 | 0.0
Fair Value | Level 3 | Municipal bonds |  |
Financial Assets |  |
Total fixed maturity securities | 53.3 | 60.8
Fair Value | Level 3 | Foreign government bonds |  |
Financial Assets |  |
Total fixed maturity securities | 0.0 | 0.0
Fair Value | Level 3 | Corporate bonds |  |
Financial Assets |  |
Total fixed maturity securities | 239.8 | 210.3
Fair Value | Level 3 | Other asset-backed securities |  |
Financial Assets |  |
Total fixed maturity securities | $ 104.6 | $ 98.9

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