XML 69 R56.htm IDEA: XBRL DOCUMENT v3.25.1
Investments - Allowance for Credit Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Rollforward of the allowance for credit loss by major security type      
Beginning balance $ 18.7 $ 4.7 $ 4.7
Additional increases (decreases) for credit losses on securities with an allowance recorded in the previous period 0.1    
Write-offs charged against allowance (11.9) (1.6)  
Foreign currency translation adjustment 0.1 (0.3)  
Ending balance 7.0 2.8 18.7
Accrued interest written off to net investment income 0.0   0.0
Corporate debt securities      
Rollforward of the allowance for credit loss by major security type      
Beginning balance 18.5 4.6 4.6
Additional increases (decreases) for credit losses on securities with an allowance recorded in the previous period 0.1    
Write-offs charged against allowance (11.9) (1.6)  
Foreign currency translation adjustment 0.1 (0.3)  
Ending balance 6.8 2.7 18.5
Other debt obligations      
Rollforward of the allowance for credit loss by major security type      
Beginning balance 0.2 0.1 0.1
Ending balance $ 0.2 $ 0.1 $ 0.2