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Loss and Loss Adjustment Expense Reserves (Details)
$ in Millions
3 Months Ended
Mar. 31, 2021
USD ($)
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]  
Gross beginning balance as of January 1, 2021 $ 696.0
Less: beginning reinsurance recoverable on unpaid losses 433.4
Net loss and LAE reserves 262.6
Loss and LAE incurred relating to:  
Current year losses 65.5
Prior year losses 0.5
Total incurred losses and LAE 66.0
Foreign currency translation adjustment to loss and LAE reserves 0.7
Loss and LAE paid relating to:  
Current year losses (5.2)
Prior year losses (19.7)
Total loss and LAE payments (24.9)
Net ending balance 304.4
Plus: ending reinsurance recoverable on unpaid losses 447.5
Gross ending balance as of March 31, 2021 $ 751.9