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Investments - Fair Value and Gross Unrealized Losses (Details)
$ in Millions
Jun. 30, 2024
USD ($)
Jun. 30, 2024
security
Jun. 30, 2024
Jun. 30, 2024
position
Dec. 31, 2023
USD ($)
Dec. 31, 2023
security
Dec. 31, 2023
Dec. 31, 2023
position
Fixed maturity securities, Gross Unrealized Losses                
Number of positions with a gross unrealized loss, 12 Months or Less (security) | security   438       195    
Number of positions with a gross unrealized loss, more than 12 months (security)   2,161   2,161   2,305   2,305
Number of positions with a gross unrealized loss, Total (security) | security   2,599       2,500    
Fair value as a percentage of total fixed maturities and equity securities fair value, 12 Months or Less (percent)     14.40%       9.20%  
Fair value as a percentage of total fixed maturities and equity securities fair value, more than 12 months (percent)     57.80%       65.20%  
Fair value as a percentage of total fixed maturities and equity securities fair value, Total (percent)     72.20%       74.40%  
Fixed maturity securities                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 Months or Less $ 767.5       $ 479.2      
Fixed maturity securities, Fair Value, More than 12 Months 3,089.0       3,415.5      
Fixed maturity securities, Fair Value, Total 3,856.5       3,894.7      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 25.3       28.3      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 494.0       452.2      
Fixed maturity securities, Gross Unrealized Losses, Total 519.3       480.5      
Mortgage-backed securities                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 Months or Less 81.7       45.3      
Fixed maturity securities, Fair Value, More than 12 Months 475.2       458.5      
Fixed maturity securities, Fair Value, Total 556.9       503.8      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 0.8       0.8      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 74.6       63.8      
Fixed maturity securities, Gross Unrealized Losses, Total 75.4       64.6      
Other                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 Months or Less 62.5       39.5      
Fixed maturity securities, Fair Value, More than 12 Months 302.0       288.0      
Fixed maturity securities, Fair Value, Total 364.5       327.5      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 0.6       0.4      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 67.4       62.4      
Fixed maturity securities, Gross Unrealized Losses, Total 68.0       62.8      
Municipal bonds                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 Months or Less 140.9       64.5      
Fixed maturity securities, Fair Value, More than 12 Months 700.9       724.6      
Fixed maturity securities, Fair Value, Total 841.8       789.1      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 1.7       0.9      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 100.3       91.0      
Fixed maturity securities, Gross Unrealized Losses, Total 102.0       91.9      
Foreign government bonds                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 Months or Less 0.0       1.5      
Fixed maturity securities, Fair Value, More than 12 Months 22.0       20.6      
Fixed maturity securities, Fair Value, Total 22.0       22.1      
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 1.1       1.0      
Fixed maturity securities, Gross Unrealized Losses, Total 1.1       1.0      
Corporate bonds                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 Months or Less 348.4       195.0      
Fixed maturity securities, Fair Value, More than 12 Months 1,114.1       1,171.3      
Fixed maturity securities, Fair Value, Total 1,462.5       1,366.3      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 21.8       25.4      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 220.3       194.9      
Fixed maturity securities, Gross Unrealized Losses, Total 242.1       220.3      
Other asset-backed securities                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 Months or Less 134.0       133.4      
Fixed maturity securities, Fair Value, More than 12 Months 474.8       752.5      
Fixed maturity securities, Fair Value, Total 608.8       885.9      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 0.4       0.8      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 30.3       39.1      
Fixed maturity securities, Gross Unrealized Losses, Total $ 30.7       $ 39.9