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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Other long-term assets and Accounts payable and accrued liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Other long-term assets:    
Long-term portion of ore in stockpiles and ore on leach pads $ 239.9 $ 327.6
Deferred charges, net of amortization 8.9 9.7
Long-term receivables 272.8 182.5
Advances for the purchase of capital equipment 6.4 3.0
Other 46.0 41.3
Total other long-term assets 574.0 564.1
Net income tax benefit in respect of of collectability of AMT credit included in long-term receivables 124.4 66.1
Net income tax benefit reclassified to current income tax recoverable (58.3)  
Accounts payable and accrued liabilities:    
Trade payables 77.4 89.1
Accrued liabilities 274.2 260.6
Employee related accrued liabilities 131.0 116.2
Total accounts payable and accrued liabilities $ 482.6 $ 465.9