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Investments - Allowance for Credit Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Rollforward of the allowance for credit loss by major security type        
Beginning balance $ 3.1 $ 2.9 $ 18.7 $ 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     (16.2) (1.6)
Additions for credit losses not previously recorded 15.7 0.1 16.1 0.1
Reductions for securities sold during the period   (0.3)   (0.3)
Foreign currency translation adjustment (0.1) 0.1   (0.1)
Ending balance 18.7 2.8 18.7 2.8
Accrued interest written off to net investment income 0.4   0.4  
Corporate debt securities        
Rollforward of the allowance for credit loss by major security type        
Beginning balance 2.5 2.8 18.5 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     (16.2) (1.6)
Additions for credit losses not previously recorded 14.9   14.9  
Reductions for securities sold during the period   (0.3)   (0.3)
Foreign currency translation adjustment (0.1) 0.1   (0.1)
Ending balance 17.3 2.6 17.3 2.6
Accrued interest written off to net investment income 0.4   0.4  
Commercial mortgage-backed securities        
Rollforward of the allowance for credit loss by major security type        
Beginning balance 0.3      
Additions for credit losses not previously recorded 0.8   1.1  
Ending balance 1.1   1.1  
Collateralized debt obligations        
Rollforward of the allowance for credit loss by major security type        
Beginning balance 0.1      
Additional increases (decreases) for credit losses on securities with an allowance recorded in the previous period (0.1)   (0.1)  
Additions for credit losses not previously recorded     0.1  
Other debt obligations        
Rollforward of the allowance for credit loss by major security type        
Beginning balance 0.2 0.1 0.2 0.1
Additional increases (decreases) for credit losses on securities with an allowance recorded in the previous period 0.1   0.1  
Additions for credit losses not previously recorded   0.1   0.1
Ending balance $ 0.3 $ 0.2 $ 0.3 $ 0.2