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Fair Value of Financial Instruments - Financial Instruments Measured and Carried at Fair Value (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Financial Assets    
Debt securities, available-for-sale $ 6,512.0 $ 6,345.3
Equity securities 152.3 121.6
Mortgage-backed securities    
Financial Assets    
Debt securities, available-for-sale 693.5 684.8
Other, including U.S. Treasury securities    
Financial Assets    
Debt securities, available-for-sale 408.9 433.2
Municipal bonds    
Financial Assets    
Debt securities, available-for-sale 1,775.5 1,827.5
Foreign government bonds    
Financial Assets    
Debt securities, available-for-sale 44.0 45.1
Corporate bonds    
Financial Assets    
Debt securities, available-for-sale 2,451.6 2,122.9
Other asset-backed securities    
Financial Assets    
Debt securities, available-for-sale 1,138.5 1,231.8
Carrying Amount    
Financial Assets    
Equity securities 152.3 121.6
Short-term investments 52.3 141.8
Other investments 43.2 36.3
Totals 6,759.8 6,645.0
Separate Account (variable annuity) assets 3,326.8 2,891.4
Financial Liabilities    
Investment contract and policy reserves, embedded derivatives 2.3 2.5
Other policyholder funds, embedded derivatives 106.7 104.5
Carrying Amount | Recurring    
Financial Assets    
Debt securities, available-for-sale 6,512.0 6,345.3
Carrying Amount | Mortgage-backed securities    
Financial Assets    
Debt securities, available-for-sale 693.5 684.8
Carrying Amount | Other, including U.S. Treasury securities    
Financial Assets    
Debt securities, available-for-sale 408.9 433.2
Carrying Amount | Municipal bonds    
Financial Assets    
Debt securities, available-for-sale 1,775.5 1,827.5
Carrying Amount | Foreign government bonds    
Financial Assets    
Debt securities, available-for-sale 44.0 45.1
Carrying Amount | Corporate bonds    
Financial Assets    
Debt securities, available-for-sale 2,451.6 2,122.9
Carrying Amount | Other asset-backed securities    
Financial Assets    
Debt securities, available-for-sale 1,138.5 1,231.8
Fair Value    
Financial Assets    
Equity securities 152.3 121.6
Short-term investments 52.3 141.8
Other investments 43.2 36.3
Totals 6,759.8 6,645.0
Separate Account (variable annuity) assets 3,326.8 2,891.4
Financial Liabilities    
Investment contract and policy reserves, embedded derivatives 2.3 2.5
Other policyholder funds, embedded derivatives 106.7 104.5
Fair Value | Recurring    
Financial Assets    
Debt securities, available-for-sale 6,512.0 6,345.3
Fair Value | Mortgage-backed securities    
Financial Assets    
Debt securities, available-for-sale 693.5 684.8
Fair Value | Other, including U.S. Treasury securities    
Financial Assets    
Debt securities, available-for-sale 408.9 433.2
Fair Value | Municipal bonds    
Financial Assets    
Debt securities, available-for-sale 1,775.5 1,827.5
Fair Value | Foreign government bonds    
Financial Assets    
Debt securities, available-for-sale 44.0 45.1
Fair Value | Corporate bonds    
Financial Assets    
Debt securities, available-for-sale 2,451.6 2,122.9
Fair Value | Other asset-backed securities    
Financial Assets    
Debt securities, available-for-sale 1,138.5 1,231.8
Fair Value | Level 1    
Financial Assets    
Equity securities 39.3 39.2
Short-term investments 36.1 137.7
Other investments 0.0 0.0
Totals 107.8 210.2
Separate Account (variable annuity) assets 3,326.8 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 32.4 33.3
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 17.9 18.4
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 14.5 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 112.6 82.1
Short-term investments 16.2 4.1
Other investments 43.2 36.3
Totals 6,289.9 6,079.7
Separate Account (variable annuity) assets 0.0 0.0
Financial Liabilities    
Investment contract and policy reserves, embedded derivatives 2.3 2.5
Other policyholder funds, embedded derivatives 0.0 0.0
Fair Value | Level 2 | Recurring    
Financial Assets    
Debt securities, available-for-sale 6,117.9 5,957.2
Fair Value | Level 2 | Mortgage-backed securities    
Financial Assets    
Debt securities, available-for-sale 693.5 673.7
Fair Value | Level 2 | Other, including U.S. Treasury securities    
Financial Assets    
Debt securities, available-for-sale 391.0 414.8
Fair Value | Level 2 | Municipal bonds    
Financial Assets    
Debt securities, available-for-sale 1,717.3 1,767.9
Fair Value | Level 2 | Foreign government bonds    
Financial Assets    
Debt securities, available-for-sale 44.0 45.1
Fair Value | Level 2 | Corporate bonds    
Financial Assets    
Debt securities, available-for-sale 2,232.1 1,952.2
Fair Value | Level 2 | Other asset-backed securities    
Financial Assets    
Debt securities, available-for-sale 1,040.0 1,103.5
Fair Value | Level 3    
Financial Assets    
Equity securities 0.4 0.3
Short-term investments 0.0 0.0
Other investments 0.0 0.0
Totals 362.1 355.1
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 106.7 104.5
Fair Value | Level 3 | Recurring    
Financial Assets    
Debt securities, available-for-sale 361.7 354.8
Fair Value | Level 3 | Mortgage-backed securities    
Financial Assets    
Debt securities, available-for-sale 0.0 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 58.2 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 205.0 155.8
Fair Value | Level 3 | Other asset-backed securities    
Financial Assets    
Debt securities, available-for-sale $ 98.5 $ 128.3