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Fair Value of Financial Instruments - Financial Instruments Measured and Carried at Fair Value (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Financial Assets    
Total fixed maturity securities $ 5,345.4 $ 5,235.3
Equity securities 82.6 86.2
Mortgage-backed securities    
Financial Assets    
Total fixed maturity securities 669.2 653.2
Other, including U.S. Treasury securities    
Financial Assets    
Total fixed maturity securities 373.5 388.8
Municipal bonds    
Financial Assets    
Total fixed maturity securities 1,176.7 1,270.1
Foreign government bonds    
Financial Assets    
Total fixed maturity securities 22.0 22.1
Corporate bonds    
Financial Assets    
Total fixed maturity securities 1,846.2 1,772.7
Other asset-backed securities    
Financial Assets    
Total fixed maturity securities 1,257.8 1,128.4
Carrying Amount | Recurring    
Financial Assets    
Total fixed maturity securities 5,345.4 5,235.3
Equity securities 82.6 86.2
Short-term investments 72.7 132.9
Other investments 19.4 19.0
Totals 5,520.1 5,473.4
Separate Account variable annuity assets 3,544.7 3,294.1
Financial Liabilities 81.8 86.0
Carrying Amount | Recurring | Mortgage-backed securities    
Financial Assets    
Total fixed maturity securities 669.2 653.2
Carrying Amount | Recurring | Other, including U.S. Treasury securities    
Financial Assets    
Total fixed maturity securities 373.5 388.8
Carrying Amount | Recurring | Municipal bonds    
Financial Assets    
Total fixed maturity securities 1,176.7 1,270.1
Carrying Amount | Recurring | Foreign government bonds    
Financial Assets    
Total fixed maturity securities 22.0 22.1
Carrying Amount | Recurring | Corporate bonds    
Financial Assets    
Total fixed maturity securities 1,846.2 1,772.7
Carrying Amount | Recurring | Other asset-backed securities    
Financial Assets    
Total fixed maturity securities 1,257.8 1,128.4
Fair Value | Recurring    
Financial Assets    
Total fixed maturity securities 5,345.4 5,235.3
Equity securities 82.6 86.2
Short-term investments 72.7 132.9
Other investments 19.4 19.0
Totals 5,520.1 5,473.4
Separate Account variable annuity assets 3,544.7 3,294.1
Financial Liabilities 81.8 86.0
Fair Value | Recurring | Level 1    
Financial Assets    
Total fixed maturity securities 33.2 55.7
Equity securities 17.7 17.9
Short-term investments 72.7 132.9
Other investments 0.0 0.0
Totals 123.6 206.5
Separate Account variable annuity assets 3,544.7 3,294.1
Financial Liabilities 0.0 0.0
Fair Value | Recurring | Level 2    
Financial Assets    
Total fixed maturity securities 4,788.3 4,665.6
Equity securities 62.2 63.8
Short-term investments 0.0 0.0
Other investments 19.4 19.0
Totals 4,869.9 4,748.4
Separate Account variable annuity assets 0.0 0.0
Financial Liabilities 3.9 3.6
Fair Value | Recurring | Level 3    
Financial Assets    
Total fixed maturity securities 523.9 514.0
Equity securities 2.7 4.5
Short-term investments 0.0 0.0
Other investments 0.0 0.0
Totals 526.6 518.5
Separate Account variable annuity assets 0.0 0.0
Financial Liabilities 77.9 82.4
Fair Value | Recurring | Mortgage-backed securities    
Financial Assets    
Total fixed maturity securities 669.2 653.2
Fair Value | Recurring | Mortgage-backed securities | Level 1    
Financial Assets    
Total fixed maturity securities 0.0 0.0
Fair Value | Recurring | Mortgage-backed securities | Level 2    
Financial Assets    
Total fixed maturity securities 669.2 653.2
Fair Value | Recurring | Mortgage-backed securities | Level 3    
Financial Assets    
Total fixed maturity securities 0.0 0.0
Fair Value | Recurring | Other, including U.S. Treasury securities    
Financial Assets    
Total fixed maturity securities 373.5 388.8
Fair Value | Recurring | Other, including U.S. Treasury securities | Level 1    
Financial Assets    
Total fixed maturity securities 24.6 45.6
Fair Value | Recurring | Other, including U.S. Treasury securities | Level 2    
Financial Assets    
Total fixed maturity securities 348.9 343.2
Fair Value | Recurring | Other, including U.S. Treasury securities | Level 3    
Financial Assets    
Total fixed maturity securities 0.0 0.0
Fair Value | Recurring | Municipal bonds    
Financial Assets    
Total fixed maturity securities 1,176.7 1,270.1
Fair Value | Recurring | Municipal bonds | Level 1    
Financial Assets    
Total fixed maturity securities 0.0 0.0
Fair Value | Recurring | Municipal bonds | Level 2    
Financial Assets    
Total fixed maturity securities 1,104.6 1,196.1
Fair Value | Recurring | Municipal bonds | Level 3    
Financial Assets    
Total fixed maturity securities 72.1 74.0
Fair Value | Recurring | Foreign government bonds    
Financial Assets    
Total fixed maturity securities 22.0 22.1
Fair Value | Recurring | Foreign government bonds | Level 1    
Financial Assets    
Total fixed maturity securities 0.0 0.0
Fair Value | Recurring | Foreign government bonds | Level 2    
Financial Assets    
Total fixed maturity securities 22.0 22.1
Fair Value | Recurring | Foreign government bonds | Level 3    
Financial Assets    
Total fixed maturity securities 0.0 0.0
Fair Value | Recurring | Corporate bonds    
Financial Assets    
Total fixed maturity securities 1,846.2 1,772.7
Fair Value | Recurring | Corporate bonds | Level 1    
Financial Assets    
Total fixed maturity securities 8.6 10.1
Fair Value | Recurring | Corporate bonds | Level 2    
Financial Assets    
Total fixed maturity securities 1,471.2 1,420.1
Fair Value | Recurring | Corporate bonds | Level 3    
Financial Assets    
Total fixed maturity securities 366.4 342.5
Fair Value | Recurring | Other asset-backed securities    
Financial Assets    
Total fixed maturity securities 1,257.8 1,128.4
Fair Value | Recurring | Other asset-backed securities | Level 1    
Financial Assets    
Total fixed maturity securities 0.0 0.0
Fair Value | Recurring | Other asset-backed securities | Level 2    
Financial Assets    
Total fixed maturity securities 1,172.4 1,030.9
Fair Value | Recurring | Other asset-backed securities | Level 3    
Financial Assets    
Total fixed maturity securities $ 85.4 $ 97.5