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Investments - Allowance for Credit Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Rollforward of the allowance for credit loss by major security type      
Beginning balance $ 7.8 $ 15.5 $ 7.4
Additions for credit losses not previously recorded 8.2 5.8 28.0
Reductions for securities sold during the period   (8.7) (12.4)
Additional increases (decreases) for credit losses on securities with an allowance recorded in the previous period (7.5) (4.2) 2.8
Write-offs charged against allowance (3.8) (0.3) (9.4)
Foreign currency translation adjustment   (0.3) (0.9)
Ending balance 4.7 7.8 15.5
Accrued interest written off to net investment income 0.1   0.2
Corporate debt securities      
Rollforward of the allowance for credit loss by major security type      
Beginning balance 7.7 15.1 0.9
Additions for credit losses not previously recorded 8.2 5.8 27.5
Reductions for securities sold during the period   (8.7) (12.4)
Additional increases (decreases) for credit losses on securities with an allowance recorded in the previous period (7.5) (4.2)  
Write-offs charged against allowance (3.8)    
Foreign currency translation adjustment   (0.3) (0.9)
Ending balance 4.6 7.7 15.1
Accrued interest written off to net investment income 0.1   0.2
Commercial mortgage-backed securities      
Rollforward of the allowance for credit loss by major security type      
Beginning balance   0.3 4.3
Additions for credit losses not previously recorded     0.4
Additional increases (decreases) for credit losses on securities with an allowance recorded in the previous period     2.4
Write-offs charged against allowance   (0.3) (6.8)
Ending balance     0.3
Collateralized debt obligations      
Rollforward of the allowance for credit loss by major security type      
Beginning balance     2.2
Additional increases (decreases) for credit losses on securities with an allowance recorded in the previous period     0.4
Write-offs charged against allowance     (2.6)
Other debt obligations      
Rollforward of the allowance for credit loss by major security type      
Beginning balance 0.1 0.1  
Additions for credit losses not previously recorded     0.1
Ending balance $ 0.1 $ 0.1 $ 0.1