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- Premiums Receivable (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
[1]
Financing Receivable, Allowance for Credit Loss [Line Items]    
Premiums receivable $ 739.1 $ 688.2
Premium Receivable, Allowance for Credit Loss [Roll Forward]    
Balance, January 1, 2020 7.9  
Current period change for estimated uncollectible premiums 0.8  
Write-offs of uncollectible premiums receivable 0.0  
Balance, March 31, 2020 8.7  
Cumulative Effect, Period Of Adoption, Adjustment    
Premium Receivable, Allowance for Credit Loss [Roll Forward]    
Balance, January 1, 2020 $ 0.0  
[1] Derived from audited consolidated financial statements.