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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