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Investments - Allowance for Credit Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Rollforward of the allowance for credit loss by major security type    
Beginning balance $ 7.4  
Additions for credit losses not previously recorded 28.0 $ 16.2
Reductions for securities sold during the period (12.4) (7.0)
Additional increases (decreases) for credit losses on securities with an allowance recorded in the previous period 2.8 0.2
Write-offs charged against allowance (9.4) (2.6)
Foreign currency translation adjustment (0.9) 0.6
Ending balance 15.5 7.4
Accrued interest written off to net investment income 0.2  
Corporate debt securities    
Rollforward of the allowance for credit loss by major security type    
Beginning balance 0.9  
Additions for credit losses not previously recorded 27.5 13.2
Reductions for securities sold during the period (12.4) (7.0)
Additional increases (decreases) for credit losses on securities with an allowance recorded in the previous period   (5.9)
Foreign currency translation adjustment (0.9) 0.6
Ending balance 15.1 0.9
Accrued interest written off to net investment income 0.2  
Commercial mortgage-backed securities    
Rollforward of the allowance for credit loss by major security type    
Beginning balance 4.3  
Additions for credit losses not previously recorded 0.4 2.9
Additional increases (decreases) for credit losses on securities with an allowance recorded in the previous period 2.4 4.0
Write-offs charged against allowance (6.8) (2.6)
Ending balance 0.3 4.3
Collateralized debt obligations    
Rollforward of the allowance for credit loss by major security type    
Beginning balance 2.2  
Additions for credit losses not previously recorded   0.1
Additional increases (decreases) for credit losses on securities with an allowance recorded in the previous period 0.4 2.1
Write-offs charged against allowance (2.6)  
Ending balance   $ 2.2
Other debt obligations    
Rollforward of the allowance for credit loss by major security type    
Additions for credit losses not previously recorded 0.1  
Ending balance $ 0.1