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Fair Value of Financial Instruments - Financial Instruments Measured and Carried at Fair Value (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Financial Assets    
Total fixed maturity securities $ 5,342.7 $ 5,235.3
Equity securities 84.7 86.2
Mortgage-backed securities    
Financial Assets    
Total fixed maturity securities 677.7 653.2
Other, including U.S. Treasury securities    
Financial Assets    
Total fixed maturity securities 391.2 388.8
Municipal bonds    
Financial Assets    
Total fixed maturity securities 1,207.5 1,270.1
Foreign government bonds    
Financial Assets    
Total fixed maturity securities 21.9 22.1
Corporate bonds    
Financial Assets    
Total fixed maturity securities 1,829.9 1,772.7
Other asset-backed securities    
Financial Assets    
Total fixed maturity securities 1,214.5 1,128.4
Carrying Amount | Recurring    
Financial Assets    
Total fixed maturity securities 5,342.7 5,235.3
Equity securities 84.7 86.2
Short-term investments 69.4 132.9
Other investments 23.1 19.0
Totals 5,519.9 5,473.4
Separate Account variable annuity assets 3,516.9 3,294.1
Financial Liabilities 85.0 86.0
Carrying Amount | Recurring | Mortgage-backed securities    
Financial Assets    
Total fixed maturity securities 677.7 653.2
Carrying Amount | Recurring | Other, including U.S. Treasury securities    
Financial Assets    
Total fixed maturity securities 391.2 388.8
Carrying Amount | Recurring | Municipal bonds    
Financial Assets    
Total fixed maturity securities 1,207.5 1,270.1
Carrying Amount | Recurring | Foreign government bonds    
Financial Assets    
Total fixed maturity securities 21.9 22.1
Carrying Amount | Recurring | Corporate bonds    
Financial Assets    
Total fixed maturity securities 1,829.9 1,772.7
Carrying Amount | Recurring | Other asset-backed securities    
Financial Assets    
Total fixed maturity securities 1,214.5 1,128.4
Fair Value | Recurring    
Financial Assets    
Total fixed maturity securities 5,342.7 5,235.3
Equity securities 84.7 86.2
Short-term investments 69.4 132.9
Other investments 23.1 19.0
Totals 5,519.9 5,473.4
Separate Account variable annuity assets 3,516.9 3,294.1
Financial Liabilities 85.0 86.0
Fair Value | Recurring | Level 1    
Financial Assets    
Total fixed maturity securities 53.6 55.7
Equity securities 18.1 17.9
Short-term investments 69.4 132.9
Other investments 0.0 0.0
Totals 141.1 206.5
Separate Account variable annuity assets 3,516.9 3,294.1
Financial Liabilities 0.0 0.0
Fair Value | Recurring | Level 2    
Financial Assets    
Total fixed maturity securities 4,781.7 4,665.6
Equity securities 64.1 63.8
Short-term investments 0.0 0.0
Other investments 23.1 19.0
Totals 4,868.9 4,748.4
Separate Account variable annuity assets 0.0 0.0
Financial Liabilities 4.2 3.6
Fair Value | Recurring | Level 3    
Financial Assets    
Total fixed maturity securities 507.4 514.0
Equity securities 2.5 4.5
Short-term investments 0.0 0.0
Other investments 0.0 0.0
Totals 509.9 518.5
Separate Account variable annuity assets 0.0 0.0
Financial Liabilities 80.8 82.4
Fair Value | Recurring | Mortgage-backed securities    
Financial Assets    
Total fixed maturity securities 677.7 653.2
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 677.7 653.2
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 391.2 388.8
Fair Value | Recurring | Other, including U.S. Treasury securities | Level 1    
Financial Assets    
Total fixed maturity securities 45.0 45.6
Fair Value | Recurring | Other, including U.S. Treasury securities | Level 2    
Financial Assets    
Total fixed maturity securities 346.2 343.2
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 1,207.5 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 1,134.3 1,196.1
Fair Value | Recurring | Municipal bonds | Level 3    
Financial Assets    
Total fixed maturity securities 73.2 74.0
Fair Value | Recurring | Foreign government bonds    
Financial Assets    
Total fixed maturity securities 21.9 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 21.9 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 1,829.9 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 1,475.8 1,420.1
Fair Value | Recurring | Corporate bonds | Level 3    
Financial Assets    
Total fixed maturity securities 345.5 342.5
Fair Value | Recurring | Other asset-backed securities    
Financial Assets    
Total fixed maturity securities 1,214.5 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 1,125.8 1,030.9
Fair Value | Recurring | Other asset-backed securities | Level 3    
Financial Assets    
Total fixed maturity securities $ 88.7 $ 97.5