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Investments - Fair Value and Gross Unrealized Losses (Details)
$ in Millions
Mar. 31, 2025
USD ($)
Mar. 31, 2025
security
Mar. 31, 2025
Mar. 31, 2025
position
Dec. 31, 2024
USD ($)
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   769       665    
Number of positions with a gross unrealized loss, more than 12 months (security)   1,828   1,828   1,862   1,862
Number of positions with a gross unrealized loss, Total (security) | security   2,597       2,527    
Fair value as a percentage of total fixed maturities and equity securities fair value, 12 Months or Less (percent)     18.70%       15.80%  
Fair value as a percentage of total fixed maturities and equity securities fair value, more than 12 months (percent)     50.10%       51.10%  
Fair value as a percentage of total fixed maturities and equity securities fair value, Total (percent)     68.80%       66.90%  
Fixed maturity securities                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 Months or Less $ 1,021.8       $ 849.1      
Fixed maturity securities, Fair Value, More than 12 Months 2,737.4       2,751.7      
Fixed maturity securities, Fair Value, Total 3,759.2       3,600.8      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 21.4       19.2      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 432.1       483.8      
Fixed maturity securities, Gross Unrealized Losses, Total 453.5       503.0      
Mortgage-backed securities                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 Months or Less 70.1       208.3      
Fixed maturity securities, Fair Value, More than 12 Months 427.0       419.3      
Fixed maturity securities, Fair Value, Total 497.1       627.6      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 0.7       3.1      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 60.0       71.7      
Fixed maturity securities, Gross Unrealized Losses, Total 60.7       74.8      
Other                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 Months or Less 45.4       77.1      
Fixed maturity securities, Fair Value, More than 12 Months 282.1       274.6      
Fixed maturity securities, Fair Value, Total 327.5       351.7      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 0.5       1.5      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 59.1       67.6      
Fixed maturity securities, Gross Unrealized Losses, Total 59.6       69.1      
Municipal bonds                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 Months or Less 206.5       193.5      
Fixed maturity securities, Fair Value, More than 12 Months 636.4       632.0      
Fixed maturity securities, Fair Value, Total 842.9       825.5      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 6.0       3.4      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 92.4       102.4      
Fixed maturity securities, Gross Unrealized Losses, Total 98.4       105.8      
Foreign government bonds                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 Months or Less 1.5       1.5      
Fixed maturity securities, Fair Value, More than 12 Months 11.8       11.7      
Fixed maturity securities, Fair Value, Total 13.3       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 0.8       0.9      
Fixed maturity securities, Gross Unrealized Losses, Total 0.8       0.9      
Corporate bonds                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 Months or Less 198.9       235.4      
Fixed maturity securities, Fair Value, More than 12 Months 1,083.2       1,075.8      
Fixed maturity securities, Fair Value, Total 1,282.1       1,311.2      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 11.8       10.3      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 200.6       219.8      
Fixed maturity securities, Gross Unrealized Losses, Total 212.4       230.1      
Other asset-backed securities                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 Months or Less 499.4       133.3      
Fixed maturity securities, Fair Value, More than 12 Months 296.9       338.3      
Fixed maturity securities, Fair Value, Total 796.3       471.6      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 2.4       0.9      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 19.2       21.4      
Fixed maturity securities, Gross Unrealized Losses, Total $ 21.6       $ 22.3