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Investments - Allowance for Credit Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Rollforward of the allowance for credit loss by major security type        
Beginning balance $ 2.8 $ 4.1 $ 4.7 $ 7.8
Write-offs charged against allowance     (1.6)  
Additions for credit losses not previously recorded   6.2   6.2
Additional increases (decreases) for credit losses on securities with an allowance recorded in the previous period   (1.8)   (6.0)
Foreign currency translation adjustment 0.1   (0.2) 0.5
Ending balance 2.9 8.5 2.9 8.5
Accrued interest written off to net investment income 0.0 0.0 0.0 0.0
Corporate debt securities        
Rollforward of the allowance for credit loss by major security type        
Beginning balance 2.7 4.0 4.6 7.7
Write-offs charged against allowance     (1.6)  
Additions for credit losses not previously recorded   6.2   6.2
Additional increases (decreases) for credit losses on securities with an allowance recorded in the previous period   (1.8)   (6.0)
Foreign currency translation adjustment 0.1   (0.2) 0.5
Ending balance 2.8 8.4 2.8 8.4
Other debt obligations        
Rollforward of the allowance for credit loss by major security type        
Beginning balance 0.1 0.1 0.1 0.1
Ending balance $ 0.1 $ 0.1 $ 0.1 $ 0.1