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Fair Value of Financial Instruments - Financial Instruments Measured and Carried at Fair Value (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Financial Assets    
Total fixed maturity securities $ 5,780.1 $ 5,714.6
Equity securities 40.6 41.9
Carrying Amount    
Financial Assets    
Total fixed maturity securities 5,780.1 5,714.6
Equity securities 40.6 41.9
Short-term investments 77.2 210.5
Other investments 16.7 21.6
Totals 5,914.6 5,988.6
Separate account (variable annuity) assets 3,959.1 4,157.4
Financial Liabilities 77.1 78.9
Carrying Amount | Mortgage-backed securities    
Financial Assets    
Total fixed maturity securities 669.1 689.0
Carrying Amount | Other, including U.S. Treasury securities    
Financial Assets    
Total fixed maturity securities 312.9 325.8
Carrying Amount | Municipal bonds    
Financial Assets    
Total fixed maturity securities 1,171.2 1,177.1
Carrying Amount | Foreign government bonds    
Financial Assets    
Total fixed maturity securities 7.9 10.0
Carrying Amount | Corporate bonds    
Financial Assets    
Total fixed maturity securities 1,953.5 1,910.3
Carrying Amount | Other asset-backed securities    
Financial Assets    
Total fixed maturity securities 1,665.5 1,602.4
Fair Value    
Financial Assets    
Total fixed maturity securities 5,780.1 5,714.6
Equity securities 40.6 41.9
Short-term investments 77.2 210.5
Other investments 16.7 21.6
Totals 5,914.6 5,988.6
Separate account (variable annuity) assets 3,959.1 4,157.4
Financial Liabilities 77.1 78.9
Fair Value | Mortgage-backed securities    
Financial Assets    
Total fixed maturity securities 669.1 689.0
Fair Value | Other, including U.S. Treasury securities    
Financial Assets    
Total fixed maturity securities 312.9 325.8
Fair Value | Municipal bonds    
Financial Assets    
Total fixed maturity securities 1,171.2 1,177.1
Fair Value | Foreign government bonds    
Financial Assets    
Total fixed maturity securities 7.9 10.0
Fair Value | Corporate bonds    
Financial Assets    
Total fixed maturity securities 1,953.5 1,910.3
Fair Value | Other asset-backed securities    
Financial Assets    
Total fixed maturity securities 1,665.5 1,602.4
Fair Value | Level 1    
Financial Assets    
Total fixed maturity securities 43.6 45.7
Equity securities 1.3 1.3
Short-term investments 77.2 210.5
Other investments 0.0 0.0
Totals 122.1 257.5
Separate account (variable annuity) assets 3,959.1 4,157.4
Financial Liabilities 0.0 0.0
Fair Value | Level 1 | Mortgage-backed securities    
Financial Assets    
Total fixed maturity securities 0.0 0.0
Fair Value | Level 1 | Other, including U.S. Treasury securities    
Financial Assets    
Total fixed maturity securities 38.2 40.8
Fair Value | Level 1 | Municipal bonds    
Financial Assets    
Total fixed maturity securities 0.0 0.0
Fair Value | Level 1 | Foreign government bonds    
Financial Assets    
Total fixed maturity securities 0.0 0.0
Fair Value | Level 1 | Corporate bonds    
Financial Assets    
Total fixed maturity securities 5.4 4.9
Fair Value | Level 1 | Other asset-backed securities    
Financial Assets    
Total fixed maturity securities 0.0 0.0
Fair Value | Level 2    
Financial Assets    
Total fixed maturity securities 5,273.0 5,203.6
Equity securities 35.7 36.8
Short-term investments 0.0 0.0
Other investments 16.7 21.6
Totals 5,325.4 5,262.0
Separate account (variable annuity) assets 0.0 0.0
Financial Liabilities 5.1 5.8
Fair Value | Level 2 | Mortgage-backed securities    
Financial Assets    
Total fixed maturity securities 669.1 689.0
Fair Value | Level 2 | Other, including U.S. Treasury securities    
Financial Assets    
Total fixed maturity securities 274.7 285.0
Fair Value | Level 2 | Municipal bonds    
Financial Assets    
Total fixed maturity securities 1,086.0 1,098.7
Fair Value | Level 2 | Foreign government bonds    
Financial Assets    
Total fixed maturity securities 7.9 10.0
Fair Value | Level 2 | Corporate bonds    
Financial Assets    
Total fixed maturity securities 1,611.5 1,562.8
Fair Value | Level 2 | Other asset-backed securities    
Financial Assets    
Total fixed maturity securities 1,623.8 1,558.1
Fair Value | Level 3    
Financial Assets    
Total fixed maturity securities 463.5 465.3
Equity securities 3.6 3.8
Short-term investments 0.0 0.0
Other investments 0.0 0.0
Totals 467.1 469.1
Separate account (variable annuity) assets 0.0 0.0
Financial Liabilities 72.0 73.1
Fair Value | Level 3 | Mortgage-backed securities    
Financial Assets    
Total fixed maturity securities 0.0 0.0
Fair Value | Level 3 | Other, including U.S. Treasury securities    
Financial Assets    
Total fixed maturity securities 0.0 0.0
Fair Value | Level 3 | Municipal bonds    
Financial Assets    
Total fixed maturity securities 85.2 78.4
Fair Value | Level 3 | Foreign government bonds    
Financial Assets    
Total fixed maturity securities 0.0 0.0
Fair Value | Level 3 | Corporate bonds    
Financial Assets    
Total fixed maturity securities 336.6 342.6
Fair Value | Level 3 | Other asset-backed securities    
Financial Assets    
Total fixed maturity securities $ 41.7 $ 44.3