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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Other long-term assets and Accounts payable and accrued liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Other long-term assets:    
Long-term portion of ore in stockpiles and ore on leach pads $ 239.9 $ 218.9
Deferred charges, net of amortization 8.9 8.6
Long-term receivables 272.8 147.2
Advances for the purchase of capital equipment 6.4 2.8
Other 46.0 33.8
Total other long-term assets 574.0 411.3
Net income tax benefit in respect of of collectivibility of AMT credit included in long-term receiveables 124.4  
Accounts payable and accrued liabilities:    
Trade payables 77.4 86.8
Accrued liabilities 274.2 251.4
Employee related accrued liabilities 131.0 126.6
Total accounts payable and accrued liabilities $ 482.6 $ 464.8