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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Consolidated Statements of Operations (Details) - USD ($)
$ in Millions
 12 Months Ended
Jun. 09, 2017
Dec. 31, 2018
Dec. 31, 2017
Other operating expense:      
Other operating expense   $ 137.0 $ 129.6
Other operating expenses relating to production issues with pit wall slide   37.9  
Other operating expenses relating to closed mining sites   28.7  
Other income (expense) - net:      
Gain on disposition of associate and other interests - net $ 12.7 2.1 55.2
(Loss) gain on disposition of other assets - net   (2.9) 1.9
Reversal of impairment charges     97.0
Foreign exchange losses   (4.3) (4.9)
Net non-hedge derivative (losses) gains   (1.2) 0.3
Other - net   9.5 38.6
Other income (expense) - net   3.2 188.1
Insurance recoveries     17.5
Settlement of a royalty agreement     9.9
Finance expense:      
Accretion on reclamation and remediation obligations   (29.1) (31.3)
Interest expense, including accretion on debt   (72.1) (86.5)
Finance expense   (101.2) (117.8)
Interest capitalized on property, plant and equipment   41.5 25.1
Total interest paid, including interest capitalized   96.1 80.9
Employee benefits expenses:      
Salaries, short-term incentives, and other benefits   668.6 678.5
Share-based payments   21.3 25.9
Other   9.6 11.2
Total employee benefits expense   $ 699.5 715.6
Cerro Casale      
Other income (expense) - net:      
Gain on disposition of associate and other interests - net     12.7
Reversal of impairment charges $ 97.0    
White Gold      
Other income (expense) - net:      
Loss on disposition of investment     1.7
DeLamar      
Other income (expense) - net:      
Gain on disposition of associate and other interests - net     $ 44.2