XML 103 R64.htm IDEA: XBRL DOCUMENT v3.25.0.1
Investments - Fair Value and Gross Unrealized Losses (Details)
$ in Millions
Dec. 31, 2024
USD ($)
Dec. 31, 2024
security
Dec. 31, 2024
Dec. 31, 2024
position
Dec. 31, 2023
USD ($)
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   665       195    
Number of positions with a gross unrealized loss, more than 12 months (security)   1,862   1,862   2,305   2,305
Number of position with a gross unrealized loss, total | security   2,527       2,500    
Fair value as a percentage of total fixed maturities securities fair value, 12 months or less (security) (percent)     15.80%       9.20%  
Fair value as a percentage of total fixed maturities and equity securities fair value, more than 12 months (percent)     51.10%       65.20%  
Fair value as a percentage of total fixed maturities and equity securities fair value, Total (percent)     66.90%       74.40%  
Fixed maturity securities                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 months or less $ 849.1       $ 479.2      
Fixed maturity securities, Fair Value, More than 12 Months 2,751.7       3,415.5      
Fixed maturity securities, fair value, total 3,600.8       3,894.7      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 19.2       28.3      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 483.8       452.2      
Fixed maturity securities, gross unrealized losses, total 503.0       480.5      
Mortgage-backed securities                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 months or less 208.3       45.3      
Fixed maturity securities, Fair Value, More than 12 Months 419.3       458.5      
Fixed maturity securities, fair value, total 627.6       503.8      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 3.1       0.8      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 71.7       63.8      
Fixed maturity securities, gross unrealized losses, total 74.8       64.6      
Other                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 months or less 77.1       39.5      
Fixed maturity securities, Fair Value, More than 12 Months 274.6       288.0      
Fixed maturity securities, fair value, total 351.7       327.5      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 1.5       0.4      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 67.6       62.4      
Fixed maturity securities, gross unrealized losses, total 69.1       62.8      
Municipal bonds                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 months or less 193.5       64.5      
Fixed maturity securities, Fair Value, More than 12 Months 632.0       724.6      
Fixed maturity securities, fair value, total 825.5       789.1      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 3.4       0.9      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 102.4       91.0      
Fixed maturity securities, gross unrealized losses, total 105.8       91.9      
Foreign government bonds                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 months or less 1.5       1.5      
Fixed maturity securities, Fair Value, More than 12 Months 11.7       20.6      
Fixed maturity securities, fair value, total 13.2       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 0.9       1.0      
Fixed maturity securities, gross unrealized losses, total 0.9       1.0      
Corporate bonds                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 months or less 235.4       195.0      
Fixed maturity securities, Fair Value, More than 12 Months 1,075.8       1,171.3      
Fixed maturity securities, fair value, total 1,311.2       1,366.3      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 10.3       25.4      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 219.8       194.9      
Fixed maturity securities, gross unrealized losses, total 230.1       220.3      
Other asset-backed securities                
Fixed maturity securities, Fair Value                
Fixed maturity securities, Fair Value, 12 months or less 133.3       133.4      
Fixed maturity securities, Fair Value, More than 12 Months 338.3       752.5      
Fixed maturity securities, fair value, total 471.6       885.9      
Fixed maturity securities, Gross Unrealized Losses                
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 0.9       0.8      
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 21.4       39.1      
Fixed maturity securities, gross unrealized losses, total $ 22.3       $ 39.9