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Investments - Fair Value and Gross Unrealized Losses (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Dec. 31, 2023
security
Dec. 31, 2023
Dec. 31, 2023
position
Dec. 31, 2022
USD ($)
Dec. 31, 2022
security
Dec. 31, 2022
Dec. 31, 2022
position
Fixed maturity securities, Gross Unrealized Losses                
Number of positions with a gross unrealized loss, 12 Months or Less (security) | security   195       2,515    
Number of positions with a gross unrealized loss, more than 12 months (security)   2,305   2,305   587   587
Number of position with a gross unrealized loss, total | security   2,500       3,102    
Fair value as a percentage of total fixed maturities and equity securities fair value, 12 Months or Less (percent)     9.20%       68.20%  
Fair value as a percentage of total fixed maturities and equity securities fair value, more than 12 months (percent)     65.20%       14.20%  
Fair value as a percentage of total fixed maturities and equity securities fair value, Total (percent)     74.40%       82.40%  
Fixed maturity securities                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 Months or Less $ 479.2       $ 3,533.7      
Fixed maturity securities, Fair Value, More than 12 Months 3,415.5       734.2      
Fixed maturity securities, fair value, total 3,894.7       4,267.9      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 28.3       461.8      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 452.2       145.1      
Fixed maturity securities, gross unrealized losses, total 480.5       606.9      
Mortgage-backed securities                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 Months or Less 45.3       458.3      
Fixed maturity securities, Fair Value, More than 12 Months 458.5       52.6      
Fixed maturity securities, fair value, total 503.8       510.9      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 0.8       54.4      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 63.8       14.7      
Fixed maturity securities, gross unrealized losses, total 64.6       69.1      
Other                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 Months or Less 39.5       242.7      
Fixed maturity securities, Fair Value, More than 12 Months 288.0       65.8      
Fixed maturity securities, fair value, total 327.5       308.5      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 0.4       34.1      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 62.4       33.7      
Fixed maturity securities, gross unrealized losses, total 62.8       67.8      
Municipal bonds                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 Months or Less 64.5       911.6      
Fixed maturity securities, Fair Value, More than 12 Months 724.6       42.2      
Fixed maturity securities, fair value, total 789.1       953.8      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 0.9       113.7      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 91.0       14.4      
Fixed maturity securities, gross unrealized losses, total 91.9       128.1      
Foreign government bonds                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 Months or Less 1.5       32.7      
Fixed maturity securities, Fair Value, More than 12 Months 20.6       0.4      
Fixed maturity securities, fair value, total 22.1       33.1      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 0.0       1.4      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 1.0       0.2      
Fixed maturity securities, gross unrealized losses, total 1.0       1.6      
Corporate bonds                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 Months or Less 195.0       1,345.0      
Fixed maturity securities, Fair Value, More than 12 Months 1,171.3       148.9      
Fixed maturity securities, fair value, total 1,366.3       1,493.9      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 25.4       221.1      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 194.9       51.1      
Fixed maturity securities, gross unrealized losses, total 220.3       272.2      
Other asset-backed securities                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 Months or Less 133.4       543.4      
Fixed maturity securities, Fair Value, More than 12 Months 752.5       424.3      
Fixed maturity securities, fair value, total 885.9       967.7      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 0.8       37.1      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 39.1       31.0      
Fixed maturity securities, gross unrealized losses, total $ 39.9       $ 68.1