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Related Party Transactions (Details) - Company's directors and executive team [member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of transactions between related parties [line items]    
Short-term employee benefits $ 8.8 $ 7.8
Share-based payments 4.5 4.2
Amounts payable, related party transactions $ 13.3 $ 12.0