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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Property, plant and equipment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Property, plant and equipment      
Balance, beginning of period $ 6,340.0    
Capitalized interest 49.1 $ 47.4  
Balance, end of period 7,653.5 6,340.0  
Assets under construction 749.0 747.0  
Assets not being depreciated $ 1,842.2 $ 1,287.6  
Capitalized interest, weighted average borrowing rate 5.20% 5.49%  
Right of use assets $ 76.2 $ 54.1  
Right-of-use assets for lease arrangements entered 38.2 22.7  
Depreciation for leased right-of-use assets 16.1 11.5  
Chulbatkan license      
Property, plant and equipment      
Additions 457.3    
Peak Gold, LLC      
Property, plant and equipment      
Balance, end of period $ 457.3    
Ownership interest in subsidiary (as a percentage) 70.00%    
Percentage of equity interest acquired     70.00%
Cost      
Property, plant and equipment      
Balance, beginning of period $ 19,269.0 18,014.2  
Additions 1,090.9 1,274.0  
Acquisitions 465.4    
Capitalized interest 49.1 47.4  
Disposals (83.0) (69.9)  
Other 0.1 3.3  
Balance, end of period 20,791.5 19,269.0  
Accumulated depreciation, depletion, amortization and impairment      
Property, plant and equipment      
Balance, beginning of period (12,929.0) (12,495.1)  
Depreciation, depletion and amortization (970.2) (853.5)  
Reversals of impairment charges 689.0 361.8  
Disposals 73.8 60.5  
Other (1.6) (2.7)  
Balance, end of period (13,138.0) (12,929.0)  
IFRS 16      
Property, plant and equipment      
Right-of-use assets for lease arrangements entered   42.9  
Land, plant and equipment      
Property, plant and equipment      
Balance, beginning of period 3,600.9    
Balance, end of period 3,718.7 3,600.9  
Assets under construction 540.8 308.8  
Assets not being depreciated 769.9 538.3  
Land, plant and equipment | Cost      
Property, plant and equipment      
Balance, beginning of period 9,715.0 9,184.2  
Additions 535.5 607.5  
Acquisitions 8.2    
Capitalized interest 22.8 14.7  
Disposals (82.9) (69.9)  
Other (8.6) (21.5)  
Balance, end of period 10,190.0 9,715.0  
Land, plant and equipment | Accumulated depreciation, depletion, amortization and impairment      
Property, plant and equipment      
Balance, beginning of period (6,114.1) (5,702.1)  
Depreciation, depletion and amortization (589.9) (572.9)  
Reversals of impairment charges 160.5 102.4  
Disposals 73.8 60.5  
Other (1.6) (2.0)  
Balance, end of period (6,471.3) (6,114.1)  
Development and operating properties      
Property, plant and equipment      
Balance, beginning of period 2,725.7    
Balance, end of period 3,469.5 2,725.7  
Assets under construction 189.1 438.2  
Assets not being depreciated 607.0 735.9  
Development and operating properties | Cost      
Property, plant and equipment      
Balance, beginning of period 9,540.6 8,816.6  
Additions 539.9 666.5  
Acquisitions 15.4    
Capitalized interest 25.5 32.7  
Disposals 0.0    
Other 14.8 24.8  
Balance, end of period 10,136.2 9,540.6  
Development and operating properties | Accumulated depreciation, depletion, amortization and impairment      
Property, plant and equipment      
Balance, beginning of period (6,814.9) (6,793.0)  
Depreciation, depletion and amortization (380.3) (280.6)  
Reversals of impairment charges 528.5 259.4  
Disposals 0.0    
Other 0.0 (0.7)  
Balance, end of period (6,666.7) (6,814.9)  
Pre-development properties      
Property, plant and equipment      
Balance, beginning of period 13.4    
Balance, end of period 465.3 13.4  
Assets under construction 19.1    
Assets not being depreciated 465.3 13.4  
Pre-development properties | Cost      
Property, plant and equipment      
Balance, beginning of period 13.4 13.4  
Additions 15.5    
Acquisitions 441.8    
Capitalized interest 0.8    
Disposals (0.1)    
Other (6.1)    
Balance, end of period 465.3 13.4  
Pre-development properties | Accumulated depreciation, depletion, amortization and impairment      
Property, plant and equipment      
Balance, beginning of period 0.0    
Depreciation, depletion and amortization 0.0    
Disposals 0.0    
Other 0.0    
Balance, end of period 0.0 0.0  
Exploration and evaluation assets      
Property, plant and equipment      
Balance, beginning of period 251.4    
Acquisitions   0.0  
Transferred to capitalized development 311.9    
Reversals of impairment charges (90.9)    
Balance, end of period 526.1 251.4  
Exploration and evaluation expenses, capitalised 38.4 20.7  
Exploration and evaluation expenses $ 19.1 $ 17.4