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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Property, plant and equipment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Jan. 11, 2016
Property, plant and equipment      
Balance, beginning of period $ 4,917.6    
Impairment, net of reversals (21.5) $ (68.3)  
Capitalized interest 25.1 15.2  
Balance, end of period 4,887.2 4,917.6  
Amount included above as at December 31, 2016:      
Assets under construction 650.6 492.9  
Assets not being depreciated $ 1,081.6 $ 952.5  
Capitalized interest, weighted average borrowing rate 5.54% 4.90%  
Round Mountain Gold Corporation/KG Mining (Round Mountain) Inc.      
Amount included above as at December 31, 2016:      
Ownership interest (as a percentage)     50.00%
Cost      
Property, plant and equipment      
Balance, beginning of period $ 15,925.8 $ 15,147.9  
Additions 925.4 653.3  
Acquisitions   817.5  
Book value of Round Mountain prior to remeasurement on acquisition   (654.1)  
Capitalized interest 25.1 15.2  
Disposals (177.7) (58.5)  
Other 3.1 4.5  
Balance, end of period 16,701.7 15,925.8  
Accumulated depreciation, depletion, amortization and impairment      
Property, plant and equipment      
Balance, beginning of period (11,008.2) (10,554.2)  
Depreciation, depletion and amortization (900.8) (927.5)  
Impairment, net of reversals (21.5) (68.3)  
Book value of Round Mountain prior to remeasurement on acquisition   493.0  
Disposals 118.0 50.4  
Other (2.0) (1.6)  
Balance, end of period (11,814.5) (11,008.2)  
Land, plant and equipment      
Property, plant and equipment      
Balance, beginning of period 2,714.9    
Balance, end of period 3,066.3 2,714.9  
Amount included above as at December 31, 2016:      
Assets under construction 534.2 373.5  
Assets not being depreciated 723.3 545.3  
Land, plant and equipment | Cost      
Property, plant and equipment      
Balance, beginning of period 7,791.3 7,332.2  
Additions 626.9 445.6  
Acquisitions   417.4  
Book value of Round Mountain prior to remeasurement on acquisition   (359.4)  
Capitalized interest 13.8 10.4  
Disposals (44.5) (57.8)  
Other (12.8) 2.9  
Balance, end of period 8,374.7 7,791.3  
Land, plant and equipment | Accumulated depreciation, depletion, amortization and impairment      
Property, plant and equipment      
Balance, beginning of period (5,076.4) (4,835.1)  
Depreciation, depletion and amortization (529.3) (528.1)  
Impairment, net of reversals 260.9 (68.3)  
Book value of Round Mountain prior to remeasurement on acquisition   305.4  
Disposals 38.8 50.4  
Other (2.4) (0.7)  
Balance, end of period (5,308.4) (5,076.4)  
Development and operating properties      
Property, plant and equipment      
Balance, beginning of period 2,117.8    
Balance, end of period 1,805.4 2,117.8  
Amount included above as at December 31, 2016:      
Assets under construction 116.4 119.4  
Assets not being depreciated 342.8 322.3  
Development and operating properties | Cost      
Property, plant and equipment      
Balance, beginning of period 7,970.2 7,651.4  
Additions 298.5 207.7  
Acquisitions   400.1  
Book value of Round Mountain prior to remeasurement on acquisition   (294.7)  
Capitalized interest 11.3 4.8  
Disposals   (0.7)  
Other 31.5 1.6  
Balance, end of period 8,311.5 7,970.2  
Development and operating properties | Accumulated depreciation, depletion, amortization and impairment      
Property, plant and equipment      
Balance, beginning of period (5,852.4) (5,639.7)  
Depreciation, depletion and amortization (371.5) (399.4)  
Impairment, net of reversals (282.4)    
Book value of Round Mountain prior to remeasurement on acquisition   187.6  
Other 0.2 (0.9)  
Balance, end of period (6,506.1) (5,852.4)  
Pre-development properties      
Property, plant and equipment      
Balance, beginning of period 84.9    
Balance, end of period 15.5 84.9  
Amount included above as at December 31, 2016:      
Assets not being depreciated 15.5 84.9  
Pre-development properties | Cost      
Property, plant and equipment      
Balance, beginning of period 164.3 164.3  
Disposals (133.2)    
Other (15.6)    
Balance, end of period 15.5 164.3  
Pre-development properties | Accumulated depreciation, depletion, amortization and impairment      
Property, plant and equipment      
Balance, beginning of period (79.4) (79.4)  
Disposals 79.2    
Other 0.2    
Balance, end of period   (79.4)  
Exploration and evaluation assets      
Property, plant and equipment      
Balance, beginning of period 216.8    
Acquisitions 0.0 0.0  
Transferred to capitalized development 0.2 0.0  
Disposals 54.1 0.0  
Balance, end of period 164.4 216.8  
Amount included above as at December 31, 2016:      
Exploration and evaluation expenses, capitalised 1.9 1.2  
Exploration and evaluation expenses $ 6.7 $ 6.8