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Reserves for unpaid losses and loss adjustment expenses (Tables)
9 Months Ended
Sep. 30, 2020
Insurance [Abstract]  
Summary of the loss and LAE reserve activities
The following table summarizes the loss and LAE reserve activities of Sirius Group for the three and nine months ended September 30, 2020 and 2019:
 Three months ended September 30,Nine months ended September 30,
(Millions)2020201920202019
Gross beginning balance$2,515.1 $2,023.3 $2,331.5 $2,016.7 
Less beginning reinsurance recoverable on unpaid losses(442.2)(357.4)(410.3)(350.2)
Net loss and LAE reserve balance2,072.9 1,665.9 1,921.2 1,666.5 
Losses and LAE incurred relating to:
Current year losses305.5 342.2 967.5 723.6 
Prior years losses(0.1)6.4 5.3 86.9 
Total net incurred losses and LAE305.4 348.6 972.8 810.5 
Foreign currency translation adjustment to net loss and LAE reserves20.8 (15.3)12.2 (15.3)
Accretion of fair value adjustment to net loss and LAE reserves0.1 — 0.1 0.1 
Loss and LAE paid relating to:
Current year losses81.6 97.7 149.2 254.8 
Prior years losses127.2 108.0 566.7 413.5 
Total loss and LAE payments208.8 205.7 715.9 668.3 
Net ending balance2,190.4 1,793.5 2,190.4 1,793.5 
Plus ending reinsurance recoverable on unpaid losses482.5 392.9 482.5 392.9 
Gross ending balance$2,672.9 $2,186.4 $2,672.9 $2,186.4