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Fair Value of Financial Instruments - Financial Instruments Measured and Carried at Fair Value (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financial Assets |  |
Debt securities, available-for-sale | $ 6,356.3 | $ 6,345.3
Equity securities | 140.0 | 121.6
Mortgage-backed securities |  |
Financial Assets |  |
Debt securities, available-for-sale | 678.3 | 684.8
Other, including U.S. Treasury securities |  |
Financial Assets |  |
Debt securities, available-for-sale | 458.3 | 433.2
Municipal bonds |  |
Financial Assets |  |
Debt securities, available-for-sale | 1,768.1 | 1,827.5
Foreign government bonds |  |
Financial Assets |  |
Debt securities, available-for-sale | 44.5 | 45.1
Corporate bonds |  |
Financial Assets |  |
Debt securities, available-for-sale | 2,194.2 | 2,122.9
Other asset-backed securities |  |
Financial Assets |  |
Debt securities, available-for-sale | 1,212.9 | 1,231.8
Carrying Amount |  |
Financial Assets |  |
Equity securities | 140.0 | 121.6
Short-term investments | 101.8 | 141.8
Other investments | 42.8 | 36.3
Totals | 6,640.9 | 6,645.0
Separate Account (variable annuity) assets | 3,052.9 | 2,891.4
Financial Liabilities |  |
Investment contract and policy reserves, embedded derivatives | 2.7 | 2.5
Other policyholder funds, embedded derivatives | 107.6 | 104.5
Carrying Amount | Recurring |  |
Financial Assets |  |
Debt securities, available-for-sale | 6,356.3 | 6,345.3
Carrying Amount | Mortgage-backed securities |  |
Financial Assets |  |
Debt securities, available-for-sale | 678.3 | 684.8
Carrying Amount | Other, including U.S. Treasury securities |  |
Financial Assets |  |
Debt securities, available-for-sale | 458.3 | 433.1
Carrying Amount | Municipal bonds |  |
Financial Assets |  |
Debt securities, available-for-sale | 1,768.1 | 1,827.5
Carrying Amount | Foreign government bonds |  |
Financial Assets |  |
Debt securities, available-for-sale | 44.5 | 45.1
Carrying Amount | Corporate bonds |  |
Financial Assets |  |
Debt securities, available-for-sale | 2,194.2 | 2,122.9
Carrying Amount | Other asset-backed securities |  |
Financial Assets |  |
Debt securities, available-for-sale | 1,212.9 | 1,231.9
Fair Value |  |
Financial Assets |  |
Equity securities | 140.0 | 121.6
Short-term investments | 101.8 | 141.8
Other investments | 42.8 | 36.3
Totals | 6,640.9 | 6,645.0
Separate Account (variable annuity) assets | 3,052.9 | 2,891.4
Financial Liabilities |  |
Investment contract and policy reserves, embedded derivatives | 2.7 | 2.5
Other policyholder funds, embedded derivatives | 107.6 | 104.5
Fair Value | Recurring |  |
Financial Assets |  |
Debt securities, available-for-sale | 6,356.3 | 6,345.3
Fair Value | Mortgage-backed securities |  |
Financial Assets |  |
Debt securities, available-for-sale | 678.3 | 684.8
Fair Value | Other, including U.S. Treasury securities |  |
Financial Assets |  |
Debt securities, available-for-sale | 458.3 | 433.1
Fair Value | Municipal bonds |  |
Financial Assets |  |
Debt securities, available-for-sale | 1,768.1 | 1,827.5
Fair Value | Foreign government bonds |  |
Financial Assets |  |
Debt securities, available-for-sale | 44.5 | 45.1
Fair Value | Corporate bonds |  |
Financial Assets |  |
Debt securities, available-for-sale | 2,194.2 | 2,122.9
Fair Value | Other asset-backed securities |  |
Financial Assets |  |
Debt securities, available-for-sale | 1,212.9 | 1,231.9
Fair Value | Level 1 |  |
Financial Assets |  |
Equity securities | 38.1 | 39.2
Short-term investments | 98.7 | 137.7
Other investments | 0.0 | 0.0
Totals | 178.3 | 210.1
Separate Account (variable annuity) assets | 3,052.9 | 2,891.4
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 | 41.5 | 33.2
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 | 27.1 | 18.3
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 | 14.4 | 14.9
Fair Value | Level 1 | Other asset-backed securities |  |
Financial Assets |  |
Debt securities, available-for-sale | 0.0 | 0.0
Fair Value | Level 2 |  |
Financial Assets |  |
Equity securities | 101.6 | 82.1
Short-term investments | 3.1 | 4.1
Other investments | 42.8 | 36.3
Totals | 6,122.4 | 6,079.8
Separate Account (variable annuity) assets | 0.0 | 0.0
Financial Liabilities |  |
Investment contract and policy reserves, embedded derivatives | 2.7 | 2.5
Other policyholder funds, embedded derivatives | 0.0 | 0.0
Fair Value | Level 2 | Recurring |  |
Financial Assets |  |
Debt securities, available-for-sale | 5,974.9 | 5,957.3
Fair Value | Level 2 | Mortgage-backed securities |  |
Financial Assets |  |
Debt securities, available-for-sale | 668.0 | 673.7
Fair Value | Level 2 | Other, including U.S. Treasury securities |  |
Financial Assets |  |
Debt securities, available-for-sale | 431.2 | 414.8
Fair Value | Level 2 | Municipal bonds |  |
Financial Assets |  |
Debt securities, available-for-sale | 1,709.5 | 1,767.9
Fair Value | Level 2 | Foreign government bonds |  |
Financial Assets |  |
Debt securities, available-for-sale | 44.5 | 45.1
Fair Value | Level 2 | Corporate bonds |  |
Financial Assets |  |
Debt securities, available-for-sale | 2,030.7 | 1,952.2
Fair Value | Level 2 | Other asset-backed securities |  |
Financial Assets |  |
Debt securities, available-for-sale | 1,091.0 | 1,103.6
Fair Value | Level 3 |  |
Financial Assets |  |
Equity securities | 0.3 | 0.3
Short-term investments | 0.0 | 0.0
Other investments | 0.0 | 0.0
Totals | 340.2 | 355.1
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 | 107.6 | 104.5
Fair Value | Level 3 | Recurring |  |
Financial Assets |  |
Debt securities, available-for-sale | 339.9 | 354.8
Fair Value | Level 3 | Mortgage-backed securities |  |
Financial Assets |  |
Debt securities, available-for-sale | 10.3 | 11.1
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 | 58.6 | 59.6
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 | 149.1 | 155.8
Fair Value | Level 3 | Other asset-backed securities |  |
Financial Assets |  |
Debt securities, available-for-sale | $ 121.9 | $ 128.3

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