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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Property, plant and equipment (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 19, 2018
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2019
Oct. 02, 2018
Property, plant and equipment          
Balance, beginning of period   $ 5,519.1      
Capitalized interest   47.4 $ 41.5    
Balance, end of period   6,340.0 5,519.1    
Amount included above as at December 31, 2018:          
Assets under construction   747.0 783.5    
Assets not being depreciated   $ 1,287.6 $ 1,316.8    
Capitalized interest, weighted average borrowing rate   5.49% 5.62%    
Right of use assets   $ 54.1      
Right-of-use assets for lease arrangements entered   22.7      
Depreciation for leased right-of-use assets   11.5      
MDO | La Coipa Phase 7 mining concessions          
Amount included above as at December 31, 2018:          
Percentage of equity interest acquired 50.00%        
KGBM | Bald Mountain Exploration LLC          
Amount included above as at December 31, 2018:          
Percentage of equity interest acquired         50.00%
Cost          
Property, plant and equipment          
Balance, beginning of period   18,014.2 $ 16,701.7    
Additions   1,274.0 1,086.5    
Acquisitions     339.9    
Capitalized interest   47.4 41.5    
Disposals   (69.9) (157.7)    
Other   3.3 2.3    
Balance, end of period   19,269.0 18,014.2    
Accumulated depreciation, depletion, amortization and impairment          
Property, plant and equipment          
Balance, beginning of period   (12,495.1) (11,814.5)    
Depreciation, depletion and amortization   (853.5) (825.5)    
Reversals of impairment charges   361.8      
Disposals   60.5 146.4    
Other   (2.7) (1.5)    
Balance, end of period   (12,929.0) (12,495.1)    
IFRS 16          
Amount included above as at December 31, 2018:          
Right of use assets       $ 42.9  
Land, plant and equipment          
Property, plant and equipment          
Balance, beginning of period   3,482.1      
Acquisitions $ 65.1        
Balance, end of period   3,600.9 3,482.1    
Amount included above as at December 31, 2018:          
Assets under construction   308.8 495.0    
Assets not being depreciated   538.3 719.1    
Land, plant and equipment | Cost          
Property, plant and equipment          
Balance, beginning of period   9,184.2 8,374.7    
Additions   607.5 629.4    
Acquisitions     274.8    
Capitalized interest   14.7 23.8    
Disposals   (69.9) (115.7)    
Other   (21.5) (2.8)    
Balance, end of period   9,715.0 9,184.2    
Land, plant and equipment | Accumulated depreciation, depletion, amortization and impairment          
Property, plant and equipment          
Balance, beginning of period   (5,702.1) (5,308.4)    
Depreciation, depletion and amortization   (572.9) (508.5)    
Reversals of impairment charges   102.4      
Disposals   60.5 106.5    
Other   (2.0) 8.3    
Balance, end of period   (6,114.1) (5,702.1)    
Development and operating properties          
Property, plant and equipment          
Balance, beginning of period   2,023.6      
Balance, end of period   2,725.7 2,023.6    
Amount included above as at December 31, 2018:          
Assets under construction   438.2 288.5    
Assets not being depreciated   735.9 584.3    
Development and operating properties | Cost          
Property, plant and equipment          
Balance, beginning of period   8,816.6 8,311.5    
Additions   666.5 457.1    
Acquisitions     65.1    
Capitalized interest   32.7 17.7    
Disposals     (39.9)    
Other   24.8 5.1    
Balance, end of period   9,540.6 8,816.6    
Development and operating properties | Accumulated depreciation, depletion, amortization and impairment          
Property, plant and equipment          
Balance, beginning of period   (6,793.0) (6,506.1)    
Depreciation, depletion and amortization   (280.6) (317.0)    
Reversals of impairment charges   259.4      
Disposals     39.9    
Other   (0.7) (9.8)    
Balance, end of period   (6,814.9) (6,793.0)    
Pre-development properties          
Property, plant and equipment          
Balance, beginning of period   13.4      
Balance, end of period   13.4 13.4    
Amount included above as at December 31, 2018:          
Assets not being depreciated   13.4 13.4    
Pre-development properties | Cost          
Property, plant and equipment          
Balance, beginning of period   13.4 15.5    
Disposals     (2.1)    
Balance, end of period   13.4 13.4    
Exploration and evaluation assets          
Property, plant and equipment          
Balance, beginning of period   230.7      
Acquisitions   0.0 65.1    
Transferred to capitalized development     0.0    
Disposals     (2.0)    
Balance, end of period   251.4 230.7    
Amount included above as at December 31, 2018:          
Exploration and evaluation expenses, capitalised   20.7 3.1    
Exploration and evaluation expenses   $ 17.4 $ 11.5