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Allowance for Credit Losses - Premiums Receivable (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Credit Loss [Abstract]    
Premiums receivable $ 674.8 $ 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 (2.1)  
Balance, June 30, 2022 3.8  
Transferred due to divestitures $ 1.5