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Investments - Fair Value and Gross Unrealized Losses (Details)
$ in Millions
Jun. 30, 2023
USD ($)
Jun. 30, 2023
security
Jun. 30, 2023
Jun. 30, 2023
position
Dec. 31, 2022
USD ($)
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   742       2,515    
Number of positions with a gross unrealized loss, more than 12 months (security)   2,227   2,227   587   587
Number of positions with a gross unrealized loss, Total (security) | security   2,969       3,102    
Fair value as a percentage of total fixed maturities and equity securities fair value, 12 Months or Less (percent)     20.80%       68.20%  
Fair value as a percentage of total fixed maturities and equity securities fair value, more than 12 months (percent)     59.30%       14.20%  
Fair value as a percentage of total fixed maturities and equity securities fair value, Total (percent)     80.10%       82.40%  
Total                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 Months or Less $ 1,085.4       $ 3,533.7      
Fixed maturity securities, Fair Value, More than 12 Months 3,092.4       734.2      
Fixed maturity securities, Fair Value, Total 4,177.8       4,267.9      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 44.6       461.8      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 492.8       145.1      
Fixed maturity securities, Gross Unrealized Losses, Total 537.4       606.9      
Mortgage-backed securities                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 Months or Less 211.9       458.3      
Fixed maturity securities, Fair Value, More than 12 Months 327.6       52.6      
Fixed maturity securities, Fair Value, Total 539.5       510.9      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 12.1       54.4      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 56.0       14.7      
Fixed maturity securities, Gross Unrealized Losses, Total 68.1       69.1      
Other                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 Months or Less 147.6       242.7      
Fixed maturity securities, Fair Value, More than 12 Months 203.8       65.8      
Fixed maturity securities, Fair Value, Total 351.4       308.5      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 6.6       34.1      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 57.0       33.7      
Fixed maturity securities, Gross Unrealized Losses, Total 63.6       67.8      
Municipal bonds                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 Months or Less 302.8       911.6      
Fixed maturity securities, Fair Value, More than 12 Months 634.9       42.2      
Fixed maturity securities, Fair Value, Total 937.7       953.8      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 8.9       113.7      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 101.1       14.4      
Fixed maturity securities, Gross Unrealized Losses, Total 110.0       128.1      
Foreign government bonds                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 Months or Less 21.8       32.7      
Fixed maturity securities, Fair Value, More than 12 Months 2.9       0.4      
Fixed maturity securities, Fair Value, Total 24.7       33.1      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 0.7       1.4      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 0.6       0.2      
Fixed maturity securities, Gross Unrealized Losses, Total 1.3       1.6      
Corporate bonds                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 Months or Less 186.5       1,345.0      
Fixed maturity securities, Fair Value, More than 12 Months 1,119.2       148.9      
Fixed maturity securities, Fair Value, Total 1,305.7       1,493.9      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 11.0       221.1      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 227.0       51.1      
Fixed maturity securities, Gross Unrealized Losses, Total 238.0       272.2      
Other asset-backed securities                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 Months or Less 214.8       543.4      
Fixed maturity securities, Fair Value, More than 12 Months 804.0       424.3      
Fixed maturity securities, Fair Value, Total 1,018.8       967.7      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 5.3       37.1      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 51.1       31.0      
Fixed maturity securities, Gross Unrealized Losses, Total $ 56.4       $ 68.1