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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Property, plant and equipment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Feb. 24, 2022
Property, plant and equipment      
Balance, beginning of period $ 7,617.7    
Capitalized interest 66.5 $ 48.3  
Reversals of impairment charges 243.2 49.3  
Balance, end of period 7,741.4 7,617.7  
Assets under construction 649.6 791.6  
Assets not being depreciated $ 2,731.2 $ 1,824.8  
Capitalized interest, weighted average borrowing rate 4.78% 5.78%  
Right of use assets $ 48.9 $ 54.2  
Right-of-use assets for lease arrangements entered 14.8 $ 32.2  
Depreciation for leased right-of-use assets $ 20.1    
Great Bear Resources Ltd. ("Great Bear")      
Property, plant and equipment      
Ownership interest in subsidiary (as a percentage) 100.00% 0.00%  
Significant pre-development properties $ 1.4   $ 0.3
Manh Choh      
Property, plant and equipment      
Additions 161.8    
Cost      
Property, plant and equipment      
Balance, beginning of period 21,602.4 $ 20,791.5  
Additions 781.1 982.5  
Acquisitions 1,368.4    
Capitalized interest 66.5 48.3  
Disposals (4,677.9) (59.6)  
Change in reclamation and remediation obligations (6.4) (17.7)  
Other 6.6 5.9  
Derecognition   (148.5)  
Balance, end of period 19,140.7 21,602.4  
Accumulated depreciation, depletion, amortization and impairment      
Property, plant and equipment      
Balance, beginning of period (13,984.7) (13,138.0)  
Disposals 3,738.5 48.8  
Other   (0.8)  
Depreciation, depletion and amortization (909.9) (993.9)  
Impairment charges (243.2)    
Derecognition   99.2  
Balance, end of period (11,399.3) (13,984.7)  
IFRS 16      
Property, plant and equipment      
Right-of-use assets for lease arrangements entered   10.2  
Land, plant and equipment      
Property, plant and equipment      
Balance, beginning of period 3,638.2    
Balance, end of period 3,349.7 3,638.2  
Assets under construction 338.4 399.9  
Assets not being depreciated 593.5 646.5  
Land, plant and equipment | Cost      
Property, plant and equipment      
Balance, beginning of period 10,524.5 10,190.0  
Additions 463.9 501.2  
Acquisitions 0.6    
Capitalized interest 17.9 25.0  
Disposals (1,496.0) (59.6)  
Other 4.3 2.3  
Derecognition   (134.4)  
Balance, end of period 9,515.2 10,524.5  
Land, plant and equipment | Accumulated depreciation, depletion, amortization and impairment      
Property, plant and equipment      
Balance, beginning of period (6,886.3) (6,471.3)  
Disposals 1,326.6 48.8  
Other   1.6  
Depreciation, depletion and amortization (490.7) (556.2)  
Impairment charges (115.1)    
Derecognition   90.8  
Balance, end of period (6,165.5) (6,886.3)  
Development and operating properties      
Property, plant and equipment      
Balance, beginning of period 3,462.2    
Balance, end of period 2,988.8 3,462.2  
Assets under construction 311.2 326.5  
Assets not being depreciated 734.8 661.0  
Development and operating properties | Cost      
Property, plant and equipment      
Balance, beginning of period 10,560.6 10,136.2  
Additions 310.1 434.5  
Capitalized interest 18.9 19.8  
Disposals (2,825.9)    
Change in reclamation and remediation obligations (6.4) (17.8)  
Other 3.5 2.0  
Derecognition   (14.1)  
Balance, end of period 8,222.6 10,560.6  
Transferred to capitalized development 161.8    
Transfers 161.8    
Development and operating properties | Accumulated depreciation, depletion, amortization and impairment      
Property, plant and equipment      
Balance, beginning of period (7,098.4) (6,666.7)  
Disposals 2,411.9    
Other   (2.4)  
Depreciation, depletion and amortization (419.2) (437.7)  
Impairment charges (128.1)    
Derecognition   8.4  
Balance, end of period (5,233.8) (7,098.4)  
Pre-development properties      
Property, plant and equipment      
Balance, beginning of period 517.3    
Balance, end of period 1,402.9 517.3  
Assets under construction 0.0 65.2  
Assets not being depreciated 1,402.9 517.3  
Pre-development properties | Cost      
Property, plant and equipment      
Balance, beginning of period 517.3 465.3  
Additions 7.1 46.8  
Acquisitions 1,367.8    
Capitalized interest 29.7 3.5  
Disposals (356.0)    
Change in reclamation and remediation obligations   0.1  
Other (1.2) 1.6  
Balance, end of period 1,402.9 517.3  
Transferred to capitalized development (161.8)    
Transfers (161.8)    
Pre-development properties | Accumulated depreciation, depletion, amortization and impairment      
Property, plant and equipment      
Balance, beginning of period 0.0    
Disposals 0.0    
Depreciation, depletion and amortization 0.0    
Balance, end of period 0.0 0.0  
Exploration and evaluation assets      
Property, plant and equipment      
Balance, beginning of period 603.6    
Balance, end of period 1,476.3 603.6  
Exploration and evaluation expenses, capitalised 44.8 39.8  
Exploration and evaluation expenses 87.0 $ 33.9  
Exploration and evaluation assets | Great Bear Resources Ltd. ("Great Bear")      
Property, plant and equipment      
Additions $ 1,367.8