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Fair Value of Financial Instruments - Financial Instruments Measured and Carried at Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Financial Assets |  |
Equity securities | $ 99.6 | $ 147.2
Carrying Value |  |
Financial Assets |  |
Equity securities | 99.6 | 147.2
Short-term investments | 109.4 | 157.8
Other investments | 38.6 | 43.6
Investments, Fair Value Disclosure, Total | 5,432.6 | 6,587.9
Separate account (variable annuity) assets | 2,792.3 | 3,441.0
Financial Liabilities |  |
Investment contract and life policy reserves, embedded derivatives | 1.2 | 2.1
Other policyholder funds, embedded derivatives | 91.0 | 106.6
Carrying Value | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 5,185.0 | 6,239.3
Carrying Value | Mortgage-backed securities |  |
Financial Assets |  |
Total fixed maturity securities |  | 662.5
Carrying Value | Mortgage-backed securities | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 570.4 |
Carrying Value | Other, including U.S. Treasury securities |  |
Financial Assets |  |
Total fixed maturity securities |  | 365.9
Carrying Value | Other, including U.S. Treasury securities | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 342.6 |
Carrying Value | Municipal bonds |  |
Financial Assets |  |
Total fixed maturity securities |  | 1,703.4
Carrying Value | Municipal bonds | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 1,269.7 |
Carrying Value | Foreign government bonds |  |
Financial Assets |  |
Total fixed maturity securities |  | 43.6
Carrying Value | Foreign government bonds | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 33.6 |
Carrying Value | Corporate bonds |  |
Financial Assets |  |
Total fixed maturity securities |  | 2,388.7
Carrying Value | Corporate bonds | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 1,901.7 |
Carrying Value | Other asset-backed securities |  |
Financial Assets |  |
Total fixed maturity securities |  | 1,075.2
Carrying Value | Other asset-backed securities | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 1,067.0 |
Fair Value |  |
Financial Assets |  |
Equity securities | 99.6 | 147.2
Short-term investments | 109.4 | 157.8
Other investments | 38.6 | 43.6
Investments, Fair Value Disclosure, Total | 5,432.6 | 6,587.9
Separate account (variable annuity) assets | 2,792.3 | 3,441.0
Financial Liabilities |  |
Investment contract and life policy reserves, embedded derivatives | 1.2 | 2.1
Other policyholder funds, embedded derivatives | 91.0 | 106.6
Fair Value | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 5,185.0 | 6,239.3
Fair Value | Level 1 |  |
Financial Assets |  |
Equity securities | 23.3 | 35.2
Short-term investments | 109.4 | 157.8
Other investments | 0.0 | 0.0
Investments, Fair Value Disclosure, Total | 169.5 | 225.6
Separate account (variable annuity) assets | 2,792.3 | 3,441.0
Financial Liabilities |  |
Investment contract and life 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 | 36.8 | 32.6
Fair Value | Level 2 |  |
Financial Assets |  |
Equity securities | 74.3 | 110.6
Short-term investments | 0.0 | 0.0
Other investments | 38.6 | 43.6
Investments, Fair Value Disclosure, Total | 4,837.8 | 5,990.9
Separate account (variable annuity) assets | 0.0 | 0.0
Financial Liabilities |  |
Investment contract and life policy reserves, embedded derivatives | 1.2 | 2.1
Other policyholder funds, embedded derivatives | 0.0 | 0.0
Fair Value | Level 2 | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 4,724.9 | 5,836.7
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
Investments, Fair Value Disclosure, Total | 425.3 | 371.4
Separate account (variable annuity) assets | 0.0 | 0.0
Financial Liabilities |  |
Investment contract and life policy reserves, embedded derivatives | 0.0 | 0.0
Other policyholder funds, embedded derivatives |  | 106.6
Fair Value | Level 3 | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 423.3 | 370.0
Fair Value | Mortgage-backed securities |  |
Financial Assets |  |
Total fixed maturity securities |  | 662.5
Fair Value | Mortgage-backed securities | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 570.4 |
Fair Value | Mortgage-backed securities | Level 1 |  |
Financial Assets |  |
Total fixed maturity securities |  | 0.0
Fair Value | Mortgage-backed securities | Level 1 | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 0.0 |
Fair Value | Mortgage-backed securities | Level 2 |  |
Financial Assets |  |
Total fixed maturity securities |  | 662.5
Fair Value | Mortgage-backed securities | Level 2 | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 567.8 |
Fair Value | Mortgage-backed securities | Level 3 |  |
Financial Assets |  |
Total fixed maturity securities |  | 0.0
Fair Value | Mortgage-backed securities | Level 3 | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 2.6 |
Fair Value | Other, including U.S. Treasury securities |  |
Financial Assets |  |
Total fixed maturity securities |  | 365.9
Fair Value | Other, including U.S. Treasury securities | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 342.6 |
Fair Value | Other, including U.S. Treasury securities | Level 1 |  |
Financial Assets |  |
Total fixed maturity securities |  | 17.7
Fair Value | Other, including U.S. Treasury securities | Level 1 | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 24.6 |
Fair Value | Other, including U.S. Treasury securities | Level 2 |  |
Financial Assets |  |
Total fixed maturity securities |  | 348.2
Fair Value | Other, including U.S. Treasury securities | Level 2 | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 318.0 |
Fair Value | Other, including U.S. Treasury securities | Level 3 |  |
Financial Assets |  |
Total fixed maturity securities |  | 0.0
Fair Value | Other, including U.S. Treasury securities | Level 3 | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 0.0 |
Fair Value | Municipal bonds |  |
Financial Assets |  |
Total fixed maturity securities |  | 1,703.4
Fair Value | Municipal bonds | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 1,269.7 |
Fair Value | Municipal bonds | Level 1 |  |
Financial Assets |  |
Total fixed maturity securities |  | 0.0
Fair Value | Municipal bonds | Level 1 | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 0.0 |
Fair Value | Municipal bonds | Level 2 |  |
Financial Assets |  |
Total fixed maturity securities |  | 1,642.6
Fair Value | Municipal bonds | Level 2 | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 1,215.3 |
Fair Value | Municipal bonds | Level 3 |  |
Financial Assets |  |
Total fixed maturity securities | 54.4 | 60.8
Fair Value | Municipal bonds | Level 3 | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 54.4 |
Fair Value | Foreign government bonds |  |
Financial Assets |  |
Total fixed maturity securities |  | 43.6
Fair Value | Foreign government bonds | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 33.6 |
Fair Value | Foreign government bonds | Level 1 |  |
Financial Assets |  |
Total fixed maturity securities |  | 0.0
Fair Value | Foreign government bonds | Level 1 | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 0.0 |
Fair Value | Foreign government bonds | Level 2 |  |
Financial Assets |  |
Total fixed maturity securities |  | 43.6
Fair Value | Foreign government bonds | Level 2 | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 33.6 |
Fair Value | Foreign government bonds | Level 3 |  |
Financial Assets |  |
Total fixed maturity securities |  | 0.0
Fair Value | Foreign government bonds | Level 3 | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 0.0 |
Fair Value | Corporate bonds |  |
Financial Assets |  |
Total fixed maturity securities |  | 2,388.7
Fair Value | Corporate bonds | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 1,901.7 |
Fair Value | Corporate bonds | Level 1 |  |
Financial Assets |  |
Total fixed maturity securities |  | 14.9
Fair Value | Corporate bonds | Level 1 | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 12.2 |
Fair Value | Corporate bonds | Level 2 |  |
Financial Assets |  |
Total fixed maturity securities |  | 2,163.5
Fair Value | Corporate bonds | Level 2 | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 1,628.2 |
Fair Value | Corporate bonds | Level 3 |  |
Financial Assets |  |
Total fixed maturity securities | 261.3 | 210.3
Fair Value | Corporate bonds | Level 3 | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 261.3 |
Fair Value | Other asset-backed securities |  |
Financial Assets |  |
Total fixed maturity securities |  | 1,075.2
Fair Value | Other asset-backed securities | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 1,067.0 |
Fair Value | Other asset-backed securities | Level 1 |  |
Financial Assets |  |
Total fixed maturity securities |  | 0.0
Fair Value | Other asset-backed securities | Level 1 | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 0.0 |
Fair Value | Other asset-backed securities | Level 2 |  |
Financial Assets |  |
Total fixed maturity securities |  | 976.3
Fair Value | Other asset-backed securities | Level 2 | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | 962.0 |
Fair Value | Other asset-backed securities | Level 3 |  |
Financial Assets |  |
Total fixed maturity securities |  | $ 98.9
Fair Value | Other asset-backed securities | Level 3 | Recurring |  |
Financial Assets |  |
Total fixed maturity securities | $ 105.0 |

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