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Reserves for unpaid losses and loss adjustment expenses (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Summary of the loss and LAE reserve activities        
Gross beginning balance $ 1,827.1 $ 1,659.3 $ 1,898.5 $ 1,620.1
Less beginning reinsurance recoverable on unpaid losses (358.3) (304.7) (319.7) (291.5)
Net loss and LAE reserve balance 1,468.8 1,354.6 1,578.8 1,328.6
Losses and LAE incurred relating to:        
Current year losses 270.5 374.6 575.8 622.5
Prior years losses (10.1) (3.4) (23.0) 4.1
Total net incurred losses and LAE 260.4 371.2 552.8 626.6
Foreign currency translation adjustment to net loss and LAE reserves (5.4) 12.9 (20.9) 33.1
Acquisitions (See Note 3) 0.2   0.2 14.3
Accretion of fair value adjustment to net loss and LAE reserves 0.1 0.1 0.1 0.1
Loss and LAE paid relating to:        
Current year losses 80.5 51.9 152.5 116.3
Prior years losses 101.6 105.1 416.5 304.6
Total loss and LAE payments 182.1 157.0 569.0 420.9
Net ending balance 1,542.0 1,581.8 1,542.0 1,581.8
Plus ending reinsurance recoverable on unpaid losses 349.0 334.9 349.0 334.9
Gross ending balance $ 1,891.0 $ 1,916.7 $ 1,891.0 $ 1,916.7