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Fair Value of Financial Instruments - Financial Instruments Measured and Carried at Fair Value (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Financial Assets    
Total fixed maturity securities $ 4,961.6 $ 5,185.0
Equity securities 77.0 99.6
Mortgage-backed securities    
Financial Assets    
Total fixed maturity securities 590.5 570.4
Other, including U.S. Treasury securities    
Financial Assets    
Total fixed maturity securities 364.9 342.7
Municipal bonds    
Financial Assets    
Total fixed maturity securities 1,185.5 1,269.7
Foreign government bonds    
Financial Assets    
Total fixed maturity securities 24.5 33.5
Corporate bonds    
Financial Assets    
Total fixed maturity securities 1,685.3 1,901.7
Other asset-backed securities    
Financial Assets    
Total fixed maturity securities 1,110.9 1,067.0
Carrying Amount | Recurring    
Financial Assets    
Total fixed maturity securities 4,961.6 5,185.0
Equity securities 77.0 99.6
Short-term investments 113.5 109.4
Other investments 43.1 38.6
Totals 5,195.2 5,432.6
Separate Account variable annuity assets 2,974.0 2,792.3
Financial Liabilities 80.3 92.5
Carrying Amount | Recurring | Mortgage-backed securities    
Financial Assets    
Total fixed maturity securities 590.5 570.4
Carrying Amount | Recurring | Other, including U.S. Treasury securities    
Financial Assets    
Total fixed maturity securities 364.8 342.6
Carrying Amount | Recurring | Municipal bonds    
Financial Assets    
Total fixed maturity securities 1,185.6 1,269.7
Carrying Amount | Recurring | Foreign government bonds    
Financial Assets    
Total fixed maturity securities 24.5 33.6
Carrying Amount | Recurring | Corporate bonds    
Financial Assets    
Total fixed maturity securities 1,685.3 1,901.7
Carrying Amount | Recurring | Other asset-backed securities    
Financial Assets    
Total fixed maturity securities 1,110.9 1,067.0
Fair Value | Recurring    
Financial Assets    
Total fixed maturity securities 4,961.6 5,185.0
Equity securities 77.0 99.6
Short-term investments 113.5 109.4
Other investments 43.1 38.6
Totals 5,195.2 5,432.6
Separate Account variable annuity assets 2,974.0 2,792.3
Financial Liabilities 80.3 92.5
Fair Value | Recurring | Level 1    
Financial Assets    
Total fixed maturity securities 54.2 36.8
Equity securities 17.2 23.3
Short-term investments 113.5 109.4
Other investments 0.0 0.0
Totals 184.9 169.5
Separate Account variable annuity assets 2,974.0 2,792.3
Financial Liabilities 0.0 0.0
Fair Value | Recurring | Level 2    
Financial Assets    
Total fixed maturity securities 4,432.0 4,724.9
Equity securities 57.6 74.3
Short-term investments 0.0 0.0
Other investments 43.1 38.6
Totals 4,532.7 4,837.8
Separate Account variable annuity assets 0.0 0.0
Financial Liabilities 2.0 1.2
Fair Value | Recurring | Level 3    
Financial Assets    
Total fixed maturity securities 475.4 423.3
Equity securities 2.2 2.0
Short-term investments 0.0 0.0
Other investments 0.0 0.0
Totals 477.6 425.3
Separate Account variable annuity assets 0.0 0.0
Financial Liabilities 78.3 91.3
Fair Value | Recurring | Mortgage-backed securities    
Financial Assets    
Total fixed maturity securities 590.5 570.4
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 588.0 567.8
Fair Value | Recurring | Mortgage-backed securities | Level 3    
Financial Assets    
Total fixed maturity securities 2.5 2.6
Fair Value | Recurring | Other, including U.S. Treasury securities    
Financial Assets    
Total fixed maturity securities 364.8 342.6
Fair Value | Recurring | Other, including U.S. Treasury securities | Level 1    
Financial Assets    
Total fixed maturity securities 44.2 24.6
Fair Value | Recurring | Other, including U.S. Treasury securities | Level 2    
Financial Assets    
Total fixed maturity securities 320.6 318.0
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 1,185.6 1,269.7
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 1,115.9 1,215.3
Fair Value | Recurring | Municipal bonds | Level 3    
Financial Assets    
Total fixed maturity securities 69.7 54.4
Fair Value | Recurring | Foreign government bonds    
Financial Assets    
Total fixed maturity securities 24.5 33.6
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 24.5 33.6
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 1,685.3 1,901.7
Fair Value | Recurring | Corporate bonds | Level 1    
Financial Assets    
Total fixed maturity securities 10.0 12.2
Fair Value | Recurring | Corporate bonds | Level 2    
Financial Assets    
Total fixed maturity securities 1,370.1 1,628.2
Fair Value | Recurring | Corporate bonds | Level 3    
Financial Assets    
Total fixed maturity securities 305.2 261.3
Fair Value | Recurring | Other asset-backed securities    
Financial Assets    
Total fixed maturity securities 1,110.9 1,067.0
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 1,012.9 962.0
Fair Value | Recurring | Other asset-backed securities | Level 3    
Financial Assets    
Total fixed maturity securities $ 98.0 $ 105.0