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Investments - Fair Value and Gross Unrealized Losses (Details)
$ in Millions
Mar. 31, 2023
USD ($)
Mar. 31, 2023
security
Mar. 31, 2023
Mar. 31, 2023
position
Dec. 31, 2022
USD ($)
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   1,295       2,515    
Number of positions with a gross unrealized loss, more than 12 months (security)   1,626   1,626   587   587
Number of positions with a gross unrealized loss, Total (security) | security   2,921       3,102    
Fair value as a percentage of total fixed maturities and equity securities fair value, 12 Months or Less (percent)     38.10%       68.20%  
Fair value as a percentage of total fixed maturities and equity securities fair value, more than 12 months (percent)     40.10%       14.20%  
Fair value as a percentage of total fixed maturities and equity securities fair value, Total (percent)     78.20%       82.40%  
Total                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 Months or Less $ 2,038.3       $ 3,533.7      
Fixed maturity securities, Fair Value, More than 12 Months 2,147.6       734.2      
Fixed maturity securities, Fair Value, Total 4,185.9       4,267.9      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 130.1       461.8      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 372.8       145.1      
Fixed maturity securities, Gross Unrealized Losses, Total 502.9       606.9      
Mortgage-backed securities                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 Months or Less 305.4       458.3      
Fixed maturity securities, Fair Value, More than 12 Months 202.0       52.6      
Fixed maturity securities, Fair Value, Total 507.4       510.9      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 22.1       54.4      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 33.5       14.7      
Fixed maturity securities, Gross Unrealized Losses, Total 55.6       69.1      
Other                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 Months or Less 167.9       242.7      
Fixed maturity securities, Fair Value, More than 12 Months 137.3       65.8      
Fixed maturity securities, Fair Value, Total 305.2       308.5      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 12.2       34.1      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 48.4       33.7      
Fixed maturity securities, Gross Unrealized Losses, Total 60.6       67.8      
Municipal bonds                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 Months or Less 509.6       911.6      
Fixed maturity securities, Fair Value, More than 12 Months 363.3       42.2      
Fixed maturity securities, Fair Value, Total 872.9       953.8      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 28.9       113.7      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 69.6       14.4      
Fixed maturity securities, Gross Unrealized Losses, Total 98.5       128.1      
Foreign government bonds                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 Months or Less 31.2       32.7      
Fixed maturity securities, Fair Value, More than 12 Months 0.4       0.4      
Fixed maturity securities, Fair Value, Total 31.6       33.1      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 1.4       1.4      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 0.1       0.2      
Fixed maturity securities, Gross Unrealized Losses, Total 1.5       1.6      
Corporate bonds                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 Months or Less 684.9       1,345.0      
Fixed maturity securities, Fair Value, More than 12 Months 781.6       148.9      
Fixed maturity securities, Fair Value, Total 1,466.5       1,493.9      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 51.4       221.1      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 177.7       51.1      
Fixed maturity securities, Gross Unrealized Losses, Total 229.1       272.2      
Other asset-backed securities                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 Months or Less 339.3       543.4      
Fixed maturity securities, Fair Value, More than 12 Months 663.0       424.3      
Fixed maturity securities, Fair Value, Total 1,002.3       967.7      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 14.1       37.1      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 43.5       31.0      
Fixed maturity securities, Gross Unrealized Losses, Total $ 57.6       $ 68.1