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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