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Investments - Fair Value and Gross Unrealized Losses (Details)
$ in Millions
Mar. 31, 2026
USD ($)
Mar. 31, 2026
security
Mar. 31, 2026
Mar. 31, 2026
position
Dec. 31, 2025
USD ($)
Dec. 31, 2025
security
Dec. 31, 2025
Dec. 31, 2025
position
Fixed maturity securities, Gross Unrealized Losses                
Number of positions with a gross unrealized loss, 12 months or less (security) | security   1,001       466    
Number of positions with a gross unrealized loss, more than 12 months (security)   1,606   1,606   1,649   1,649
Number of positions with a gross unrealized loss, total (security) | security   2,607       2,115    
Fair value as a percentage of total fixed maturities and equity securities fair value, 12 months or less (percent)     28.80%       14.90%  
Fair value as a percentage of total fixed maturities and equity securities fair value, more than 12 months (percent)     40.10%       42.50%  
Fair value as a percentage of total fixed maturities and equity securities fair value, total (percent)     68.90%       57.40%  
Fixed maturity securities                
Fixed maturity securities, Fair Value                
Fixed maturity securities, fair value, 12 months or less $ 1,665.1       $ 849.6      
Fixed maturity securities, fair value, more than 12 months 2,319.9       2,429.8      
Fixed maturity securities, fair value, total 3,985.0       3,279.4      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, gross unrealized losses, 12 months or less 29.8       15.2      
Fixed maturity securities, gross unrealized losses, more than 12 months 394.0       371.0      
Fixed maturity securities, gross unrealized losses, total 423.8       386.2      
Mortgage-backed securities                
Fixed maturity securities, Fair Value                
Fixed maturity securities, fair value, 12 months or less 157.5       69.7      
Fixed maturity securities, fair value, more than 12 months 229.9       247.9      
Fixed maturity securities, fair value, total 387.4       317.6      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, gross unrealized losses, 12 months or less 1.2       0.3      
Fixed maturity securities, gross unrealized losses, more than 12 months 39.4       38.3      
Fixed maturity securities, gross unrealized losses, total 40.6       38.6      
Other                
Fixed maturity securities, Fair Value                
Fixed maturity securities, fair value, 12 months or less 28.2       27.1      
Fixed maturity securities, fair value, more than 12 months 271.4       276.1      
Fixed maturity securities, fair value, total 299.6       303.2      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, gross unrealized losses, 12 months or less 0.7       0.4      
Fixed maturity securities, gross unrealized losses, more than 12 months 57.4       55.7      
Fixed maturity securities, gross unrealized losses, total 58.1       56.1      
Municipal bonds                
Fixed maturity securities, Fair Value                
Fixed maturity securities, fair value, 12 months or less 191.2       126.0      
Fixed maturity securities, fair value, more than 12 months 583.4       596.4      
Fixed maturity securities, fair value, total 774.6       722.4      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, gross unrealized losses, 12 months or less 3.9       2.8      
Fixed maturity securities, gross unrealized losses, more than 12 months 86.3       79.9      
Fixed maturity securities, gross unrealized losses, total 90.2       82.7      
Foreign government bonds                
Fixed maturity securities, Fair Value                
Fixed maturity securities, fair value, 12 months or less 1.0       0.0      
Fixed maturity securities, fair value, more than 12 months 6.9       9.0      
Fixed maturity securities, fair value, total 7.9       9.0      
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 0.7       0.6      
Fixed maturity securities, gross unrealized losses, total 0.7       0.6      
Corporate bonds                
Fixed maturity securities, Fair Value                
Fixed maturity securities, fair value, 12 months or less 597.3       387.3      
Fixed maturity securities, fair value, more than 12 months 901.9       930.6      
Fixed maturity securities, fair value, total 1,499.2       1,317.9      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, gross unrealized losses, 12 months or less 18.6       10.5      
Fixed maturity securities, gross unrealized losses, more than 12 months 185.7       171.6      
Fixed maturity securities, gross unrealized losses, total 204.3       182.1      
Other asset-backed securities                
Fixed maturity securities, Fair Value                
Fixed maturity securities, fair value, 12 months or less 689.9       239.5      
Fixed maturity securities, fair value, more than 12 months 326.4       369.8      
Fixed maturity securities, fair value, total 1,016.3       609.3      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, gross unrealized losses, 12 months or less 5.4       1.2      
Fixed maturity securities, gross unrealized losses, more than 12 months 24.5       24.9      
Fixed maturity securities, gross unrealized losses, total $ 29.9       $ 26.1