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Allowance for Credit Losses - Premiums Receivable (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Credit Loss [Abstract]    
Premiums receivable $ 656.5 $ 648.6
Premium Receivable, Allowance for Credit Loss [Roll Forward]    
Balance, January 1, 2022 5.7  
Current period change for estimated uncollectible premiums 0.2  
Write-offs of uncollectible premiums receivable (1.8)  
Balance, September 30, 2022 4.1  
Transferred due to divestitures $ 1.5