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Investments - Fair Value and Gross Unrealized Losses (Details)
$ in Millions
Dec. 31, 2025
USD ($)
Dec. 31, 2025
security
Dec. 31, 2025
Dec. 31, 2025
position
Dec. 31, 2024
USD ($)
Dec. 31, 2024
security
Dec. 31, 2024
Dec. 31, 2024
position
Fixed maturity securities, Gross Unrealized Losses                
Number of positions with a gross unrealized loss, 12 months or less (security) | security   466       665    
Number of positions with a gross unrealized loss, more than 12 months (security)   1,649   1,649   1,862   1,862
Number of position with a gross unrealized loss, total | security   2,115       2,527    
Fair value as a percentage of total fixed maturities securities fair value, 12 months or less (security) (percent)     14.90%       15.80%  
Fair value as a percentage of total fixed maturities and equity securities fair value, more than 12 months (percent)     42.50%       51.10%  
Fair value as a percentage of total fixed maturities and equity securities fair value, Total (percent)     57.40%       66.90%  
Fixed maturity securities                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 months or less $ 849.6       $ 849.1      
Fixed maturity securities, Fair Value, More than 12 Months 2,429.8       2,751.7      
Fixed maturity securities, fair value, total 3,279.4       3,600.8      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 15.2       19.2      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 371.0       483.8      
Fixed maturity securities, gross unrealized losses, total 386.2       503.0      
Mortgage-backed securities                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 months or less 69.7       208.3      
Fixed maturity securities, Fair Value, More than 12 Months 247.9       419.3      
Fixed maturity securities, fair value, total 317.6       627.6      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 0.3       3.1      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 38.3       71.7      
Fixed maturity securities, gross unrealized losses, total 38.6       74.8      
Other                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 months or less 27.1       77.1      
Fixed maturity securities, Fair Value, More than 12 Months 276.1       274.6      
Fixed maturity securities, fair value, total 303.2       351.7      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 0.4       1.5      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 55.7       67.6      
Fixed maturity securities, gross unrealized losses, total 56.1       69.1      
Municipal bonds                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 months or less 126.0       193.5      
Fixed maturity securities, Fair Value, More than 12 Months 596.4       632.0      
Fixed maturity securities, fair value, total 722.4       825.5      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 2.8       3.4      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 79.9       102.4      
Fixed maturity securities, gross unrealized losses, total 82.7       105.8      
Foreign government bonds                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 months or less 0.0       1.5      
Fixed maturity securities, Fair Value, More than 12 Months 9.0       11.7      
Fixed maturity securities, fair value, total 9.0       13.2      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 0.0       0.0      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 0.6       0.9      
Fixed maturity securities, gross unrealized losses, total 0.6       0.9      
Corporate bonds                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 months or less 387.3       235.4      
Fixed maturity securities, Fair Value, More than 12 Months 930.6       1,075.8      
Fixed maturity securities, fair value, total 1,317.9       1,311.2      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 10.5       10.3      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 171.6       219.8      
Fixed maturity securities, gross unrealized losses, total 182.1       230.1      
Other asset-backed securities                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 months or less 239.5       133.3      
Fixed maturity securities, Fair Value, More than 12 Months 369.8       338.3      
Fixed maturity securities, fair value, total 609.3       471.6      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 1.2       0.9      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 24.9       21.4      
Fixed maturity securities, gross unrealized losses, total $ 26.1       $ 22.3