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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Property, plant and equipment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Property, plant and equipment    
Balance at beginning of the period $ 7,963.2  
Balance at end of the period 7,968.6 $ 7,963.2
Assets under construction 626.3 831.1
Assets not being depreciated 2,682.0 2,982.5
Right-of-use assets for lease arrangements entered 1.9 7.9
Depreciation for leased right-of-use assets 12.6 14.3
Right of use assets $ 21.0 $ 31.7
Capitalized interest, weighted average borrowing rate 6.26% 6.56%
Great Bear Resources Ltd.    
Property, plant and equipment    
Significant pre-development properties $ 1,564.4 $ 1,492.0
Cost    
Property, plant and equipment    
Balance at beginning of the period 20,484.0 19,140.7
Additions 1,160.0 1,233.1
Capitalized interest 88.2 108.9
Disposals (98.9) (117.9)
Change in reclamation and remediation obligations 53.1 102.3
Transfers and other (0.3) 16.9
Balance at end of the period 21,686.1 20,484.0
Accumulated depreciation, depletion, amortization and impairment    
Property, plant and equipment    
Balance at beginning of the period (12,520.8) (11,399.3)
Impairment reversal 74.1  
Disposals 91.6 102.7
Depreciation, depletion and amortization (1,362.4) (1,224.2)
Balance at end of the period (13,717.5) (12,520.8)
Land, plant and equipment    
Property, plant and equipment    
Balance at beginning of the period 3,486.5  
Balance at end of the period 3,383.5 3,486.5
Assets under construction 276.3 542.0
Assets not being depreciated 543.2 806.6
Land, plant and equipment | Cost    
Property, plant and equipment    
Balance at beginning of the period 10,138.6 9,515.2
Additions 442.2 677.5
Capitalized interest 13.5 23.3
Disposals (64.7) (110.2)
Transfers and other 51.9 32.8
Balance at end of the period 10,581.5 10,138.6
Land, plant and equipment | Accumulated depreciation, depletion, amortization and impairment    
Property, plant and equipment    
Balance at beginning of the period (6,652.1) (6,165.5)
Impairment reversal 57.4  
Disposals 55.2 102.7
Depreciation, depletion and amortization (658.5) (589.3)
Balance at end of the period (7,198.0) (6,652.1)
Development and operating properties    
Property, plant and equipment    
Balance at beginning of the period 2,984.7  
Balance at end of the period 3,014.9 2,984.7
Assets under construction 305.9 267.4
Assets not being depreciated 568.6 683.9
Development and operating properties | Cost    
Property, plant and equipment    
Balance at beginning of the period 8,853.4 8,222.6
Additions 695.2 532.7
Capitalized interest 19.1 19.4
Disposals (34.2) (7.7)
Change in reclamation and remediation obligations 53.1 102.3
Transfers and other (52.2) (15.9)
Balance at end of the period 9,534.4 8,853.4
Development and operating properties | Accumulated depreciation, depletion, amortization and impairment    
Property, plant and equipment    
Balance at beginning of the period (5,868.7) (5,233.8)
Impairment reversal 16.7  
Disposals 36.4  
Depreciation, depletion and amortization (703.9) (634.9)
Balance at end of the period (6,519.5) (5,868.7)
Pre-development properties    
Property, plant and equipment    
Balance at beginning of the period 1,492.0  
Balance at end of the period 1,570.2 1,492.0
Assets under construction 44.1 21.7
Assets not being depreciated 1,570.2 1,492.0
Exploration and evaluation expenses, capitalised 78.2 89.2
Exploration and evaluation expenses, expensed 61.1 68.5
Pre-development properties | Cost    
Property, plant and equipment    
Balance at beginning of the period 1,492.0 1,402.9
Additions 22.6 22.9
Capitalized interest 55.6 66.2
Balance at end of the period 1,570.2 1,492.0
Exploration and evaluation assets    
Property, plant and equipment    
Balance at beginning of the period 1,569.7  
Capitalized interest 55.6 66.3
Balance at end of the period 1,661.8 1,569.7
Exploration and evaluation expenses, capitalised 92.1 93.4
Exploration and evaluation expenses, expensed 166.4 158.9
Total $ 258.5 $ 252.3