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Fair Value of Financial Instruments - Financial Instruments Measured and Carried at Fair Value (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Financial Assets    
Debt securities, available-for-sale $ 6,555.0 $ 6,345.3
Equity securities 145.7 121.6
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 456.2 433.2
Municipal bonds    
Financial Assets    
Debt securities, available-for-sale 1,799.1 1,827.5
Foreign government bonds    
Financial Assets    
Debt securities, available-for-sale 44.4 45.1
Corporate bonds    
Financial Assets    
Debt securities, available-for-sale 2,408.8 2,122.9
Other asset-backed securities    
Financial Assets    
Debt securities, available-for-sale 1,168.2 1,231.8
Carrying Amount    
Financial Assets    
Equity securities 145.7 121.6
Short-term investments 93.5 141.8
Other investments 46.8 36.3
Totals 6,841.0 6,645.0
Separate Account (variable annuity) assets 3,256.7 2,891.4
Financial Liabilities    
Investment contract and policy reserves, embedded derivatives 2.8 2.5
Other policyholder funds, embedded derivatives 108.9 104.5
Carrying Amount | Recurring    
Financial Assets    
Debt securities, available-for-sale 6,555.0 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 456.2 433.2
Carrying Amount | Municipal bonds    
Financial Assets    
Debt securities, available-for-sale 1,799.1 1,827.5
Carrying Amount | Foreign government bonds    
Financial Assets    
Debt securities, available-for-sale 44.4 45.1
Carrying Amount | Corporate bonds    
Financial Assets    
Debt securities, available-for-sale 2,408.8 2,122.9
Carrying Amount | Other asset-backed securities    
Financial Assets    
Debt securities, available-for-sale 1,168.2 1,231.8
Fair Value    
Financial Assets    
Equity securities 145.7 121.6
Short-term investments 93.5 141.8
Other investments 46.8 36.3
Totals 6,841.0 6,645.0
Separate Account (variable annuity) assets 3,256.7 2,891.4
Financial Liabilities    
Investment contract and policy reserves, embedded derivatives 2.8 2.5
Other policyholder funds, embedded derivatives 108.9 104.5
Fair Value | Recurring    
Financial Assets    
Debt securities, available-for-sale 6,555.0 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 456.2 433.2
Fair Value | Municipal bonds    
Financial Assets    
Debt securities, available-for-sale 1,799.1 1,827.5
Fair Value | Foreign government bonds    
Financial Assets    
Debt securities, available-for-sale 44.4 45.1
Fair Value | Corporate bonds    
Financial Assets    
Debt securities, available-for-sale 2,408.8 2,122.9
Fair Value | Other asset-backed securities    
Financial Assets    
Debt securities, available-for-sale 1,168.2 1,231.8
Fair Value | Level 1    
Financial Assets    
Equity securities 40.0 39.2
Short-term investments 90.4 137.7
Other investments 0.0 0.0
Totals 173.0 210.2
Separate Account (variable annuity) assets 3,256.7 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 42.6 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 28.0 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 14.6 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 105.4 82.1
Short-term investments 3.1 4.1
Other investments 46.8 36.3
Totals 6,343.1 6,079.7
Separate Account (variable annuity) assets 0.0 0.0
Financial Liabilities    
Investment contract and policy reserves, embedded derivatives 2.8 2.5
Other policyholder funds, embedded derivatives 0.0 0.0
Fair Value | Level 2 | Recurring    
Financial Assets    
Debt securities, available-for-sale 6,187.8 5,957.2
Fair Value | Level 2 | Mortgage-backed securities    
Financial Assets    
Debt securities, available-for-sale 678.3 673.7
Fair Value | Level 2 | Other, including U.S. Treasury securities    
Financial Assets    
Debt securities, available-for-sale 428.2 414.8
Fair Value | Level 2 | Municipal bonds    
Financial Assets    
Debt securities, available-for-sale 1,740.5 1,767.9
Fair Value | Level 2 | Foreign government bonds    
Financial Assets    
Debt securities, available-for-sale 44.4 45.1
Fair Value | Level 2 | Corporate bonds    
Financial Assets    
Debt securities, available-for-sale 2,243.7 1,952.2
Fair Value | Level 2 | Other asset-backed securities    
Financial Assets    
Debt securities, available-for-sale 1,052.7 1,103.5
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 324.9 355.1
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 108.9 104.5
Fair Value | Level 3 | Recurring    
Financial Assets    
Debt securities, available-for-sale 324.6 354.8
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 58.6 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 150.5 155.8
Fair Value | Level 3 | Other asset-backed securities    
Financial Assets    
Debt securities, available-for-sale $ 115.5 $ 128.3