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Fair Value of Financial Instruments - Financial Instruments Measured and Carried at Fair Value (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Financial Assets |  |
Debt securities, available-for-sale | $ 5,987.4 | $ 6,239.3
Equity securities | 126.8 | 147.2
Mortgage-backed securities |  |
Financial Assets |  |
Debt securities, available-for-sale | 615.5 | 662.5
Other, including U.S. Treasury securities |  |
Financial Assets |  |
Debt securities, available-for-sale | 363.1 | 365.9
Municipal bonds |  |
Financial Assets |  |
Debt securities, available-for-sale | 1,579.5 | 1,703.4
Foreign government bonds |  |
Financial Assets |  |
Debt securities, available-for-sale | 42.6 | 43.6
Corporate bonds |  |
Financial Assets |  |
Debt securities, available-for-sale | 2,296.0 | 2,388.7
Other asset-backed securities |  |
Financial Assets |  |
Debt securities, available-for-sale | 1,090.7 | 1,075.2
Carrying Amount |  |
Financial Assets |  |
Equity securities | 126.8 | 147.2
Short-term investments | 126.9 | 157.8
Other investments | 38.1 | 43.6
Totals | 6,279.2 | 6,587.9
Separate Account (variable annuity) assets | 3,221.9 | 3,441.0
Financial Liabilities |  |
Investment contract and policy reserves, embedded derivatives | 1.5 | 2.1
Other policyholder funds, embedded derivatives | 99.1 | 106.6
Carrying Amount | Recurring |  |
Financial Assets |  |
Debt securities, available-for-sale | 5,987.4 | 6,239.3
Carrying Amount | Mortgage-backed securities |  |
Financial Assets |  |
Debt securities, available-for-sale | 615.5 | 662.5
Carrying Amount | Other, including U.S. Treasury securities |  |
Financial Assets |  |
Debt securities, available-for-sale | 363.1 | 365.9
Carrying Amount | Municipal bonds |  |
Financial Assets |  |
Debt securities, available-for-sale | 1,579.5 | 1,703.4
Carrying Amount | Foreign government bonds |  |
Financial Assets |  |
Debt securities, available-for-sale | 42.6 | 43.6
Carrying Amount | Corporate bonds |  |
Financial Assets |  |
Debt securities, available-for-sale | 2,296.0 | 2,388.7
Carrying Amount | Other asset-backed securities |  |
Financial Assets |  |
Debt securities, available-for-sale | 1,090.7 |
Carrying Amount | Other asset-backed securities |  |
Financial Assets |  |
Debt securities, available-for-sale |  | 1,075.2
Fair Value |  |
Financial Assets |  |
Equity securities | 126.8 | 147.2
Short-term investments | 126.9 | 157.8
Other investments | 38.1 | 43.6
Totals | 6,279.2 | 6,587.9
Separate Account (variable annuity) assets | 3,221.9 | 3,441.0
Financial Liabilities |  |
Investment contract and policy reserves, embedded derivatives | 1.5 | 2.1
Other policyholder funds, embedded derivatives | 99.1 | 106.6
Fair Value | Recurring |  |
Financial Assets |  |
Debt securities, available-for-sale | 5,987.4 | 6,239.3
Fair Value | Mortgage-backed securities |  |
Financial Assets |  |
Debt securities, available-for-sale | 615.5 | 662.5
Fair Value | Other, including U.S. Treasury securities |  |
Financial Assets |  |
Debt securities, available-for-sale | 363.1 | 365.9
Fair Value | Municipal bonds |  |
Financial Assets |  |
Debt securities, available-for-sale | 1,579.5 | 1,703.4
Fair Value | Foreign government bonds |  |
Financial Assets |  |
Debt securities, available-for-sale | 42.6 | 43.6
Fair Value | Corporate bonds |  |
Financial Assets |  |
Debt securities, available-for-sale | 2,296.0 | 2,388.7
Fair Value | Other asset-backed securities |  |
Financial Assets |  |
Debt securities, available-for-sale | 1,090.7 |
Fair Value | Other asset-backed securities |  |
Financial Assets |  |
Debt securities, available-for-sale |  | 1,075.2
Fair Value | Level 1 |  |
Financial Assets |  |
Equity securities | 25.6 | 35.2
Short-term investments | 122.0 | 157.8
Other investments | 0.0 | 0.0
Totals | 186.8 | 225.6
Separate Account (variable annuity) assets | 3,221.9 | 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 |  |
Debt securities, available-for-sale | 39.2 | 32.6
Fair Value | Level 1 | Mortgage-backed securities |  |
Financial Assets |  |
Debt securities, available-for-sale | 0.0 | 0.0
Fair Value | Level 1 | Other, including U.S. Treasury securities |  |
Financial Assets |  |
Debt securities, available-for-sale | 25.2 | 17.7
Fair Value | Level 1 | Municipal bonds |  |
Financial Assets |  |
Debt securities, available-for-sale | 0.0 | 0.0
Fair Value | Level 1 | Foreign government bonds |  |
Financial Assets |  |
Debt securities, available-for-sale | 0.0 | 0.0
Fair Value | Level 1 | Corporate bonds |  |
Financial Assets |  |
Debt securities, available-for-sale | 14.0 | 14.9
Fair Value | Level 1 | Other asset-backed securities |  |
Financial Assets |  |
Debt securities, available-for-sale | 0.0 |
Fair Value | Level 1 | Other asset-backed securities |  |
Financial Assets |  |
Debt securities, available-for-sale |  | 0.0
Fair Value | Level 2 |  |
Financial Assets |  |
Equity securities | 99.9 | 110.6
Short-term investments | 4.9 | 0.0
Other investments | 38.1 | 43.6
Totals | 5,721.2 | 5,990.9
Separate Account (variable annuity) assets | 0.0 | 0.0
Financial Liabilities |  |
Investment contract and policy reserves, embedded derivatives | 1.5 | 2.1
Other policyholder funds, embedded derivatives | 0.0 | 0.0
Fair Value | Level 2 | Recurring |  |
Financial Assets |  |
Debt securities, available-for-sale | 5,578.3 | 5,836.7
Fair Value | Level 2 | Mortgage-backed securities |  |
Financial Assets |  |
Debt securities, available-for-sale | 615.5 | 662.5
Fair Value | Level 2 | Other, including U.S. Treasury securities |  |
Financial Assets |  |
Debt securities, available-for-sale | 337.9 | 348.2
Fair Value | Level 2 | Municipal bonds |  |
Financial Assets |  |
Debt securities, available-for-sale | 1,525.4 | 1,642.6
Fair Value | Level 2 | Foreign government bonds |  |
Financial Assets |  |
Debt securities, available-for-sale | 42.6 | 43.6
Fair Value | Level 2 | Corporate bonds |  |
Financial Assets |  |
Debt securities, available-for-sale | 2,056.0 | 2,163.5
Fair Value | Level 2 | Other asset-backed securities |  |
Financial Assets |  |
Debt securities, available-for-sale | 1,000.9 |
Fair Value | Level 2 | Other asset-backed securities |  |
Financial Assets |  |
Debt securities, available-for-sale |  | 976.3
Fair Value | Level 3 |  |
Financial Assets |  |
Equity securities | 1.3 | 1.4
Short-term investments | 0.0 | 0.0
Other investments | 0.0 | 0.0
Totals | 371.2 | 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 | 99.1 | 106.6
Fair Value | Level 3 | Recurring |  |
Financial Assets |  |
Debt securities, available-for-sale | 369.9 | 370.0
Fair Value | Level 3 | Mortgage-backed securities |  |
Financial Assets |  |
Debt securities, available-for-sale | 0.0 | 0.0
Fair Value | Level 3 | Other, including U.S. Treasury securities |  |
Financial Assets |  |
Debt securities, available-for-sale | 0.0 | 0.0
Fair Value | Level 3 | Municipal bonds |  |
Financial Assets |  |
Debt securities, available-for-sale | 54.1 | 60.8
Fair Value | Level 3 | Foreign government bonds |  |
Financial Assets |  |
Debt securities, available-for-sale | 0.0 | 0.0
Fair Value | Level 3 | Corporate bonds |  |
Financial Assets |  |
Debt securities, available-for-sale | 226.0 | 210.3
Fair Value | Level 3 | Other asset-backed securities |  |
Financial Assets |  |
Debt securities, available-for-sale | $ 89.8 |
Fair Value | Level 3 | Other asset-backed securities |  |
Financial Assets |  |
Debt securities, available-for-sale |  | $ 98.9

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