XML 73 R50.htm IDEA: XBRL DOCUMENT v3.22.0.1
Mineral Property, Plant and Equipment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment $ 3,101.3  
Pre-tax impairment charge 224.3 $ 0.0
Mineral property, plant and equipment 3,108.5 3,101.3
Gross carrying amount [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment 4,466.6 4,138.0
Additions 359.3 243.0
Revisions 29.8 17.1
Disposals (6.0) (5.6)
Transfers   0.0
Mineral property, plant and equipment 4,865.4 4,466.6
Accumulated depreciation, amortisation and impairment [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment (1,365.3) (1,204.6)
Amortization 177.3 165.3
Disposals 4.5 4.6
Pre-tax impairment charge 218.8  
Mineral property, plant and equipment (1,756.9) (1,365.3)
Plant and Equipment [Member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment 888.7  
Mineral property, plant and equipment 911.5 888.7
Plant and Equipment [Member] | Gross carrying amount [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment 1,530.0 1,320.3
Additions 105.3 94.1
Revisions 0.0 0.0
Disposals (6.0) (5.6)
Transfers   121.2
Mineral property, plant and equipment 1,629.3 1,530.0
Plant and Equipment [Member] | Accumulated depreciation, amortisation and impairment [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment (641.3) (569.4)
Amortization 80.7 76.5
Disposals 4.5 4.6
Pre-tax impairment charge 0.3  
Mineral property, plant and equipment (717.8) (641.3)
Mineral property - non-depletable    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment 1,768.2  
Mineral property, plant and equipment 1,819.4 1,768.2
Mineral property - non-depletable | Gross carrying amount [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment 2,483.4 2,316.5
Additions 113.7 95.0
Revisions 18.4 17.1
Disposals 0.0 0.0
Transfers   0.0
Mineral property, plant and equipment 2,631.2 2,483.4
Mineral property - non-depletable | Accumulated depreciation, amortisation and impairment [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment (715.2) (626.4)
Amortization 96.6 88.8
Disposals 0.0 0.0
Pre-tax impairment charge 0.0  
Mineral property, plant and equipment (811.8) (715.2)
Mineral Property - Non-Depletable [Member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment 157.7  
Mineral property, plant and equipment 143.2 157.7
Mineral Property - Non-Depletable [Member] | Gross carrying amount [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment 157.7 239.2
Additions 116.5 39.7
Revisions 11.4 0.0
Disposals 0.0 0.0
Transfers   (121.2)
Mineral property, plant and equipment 285.6 157.7
Mineral Property - Non-Depletable [Member] | Accumulated depreciation, amortisation and impairment [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment 0.0 0.0
Amortization 0.0 0.0
Disposals 0.0 0.0
Pre-tax impairment charge 142.4  
Mineral property, plant and equipment (142.4) 0.0
Exploration and evaluation    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment 286.7  
Mineral property, plant and equipment 234.4 286.7
Exploration and evaluation | Gross carrying amount [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment 295.5 262.0
Additions 23.8 14.2
Revisions 0.0 0.0
Disposals 0.0 0.0
Transfers   0.0
Mineral property, plant and equipment 319.3 295.5
Exploration and evaluation | Accumulated depreciation, amortisation and impairment [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment (8.8) (8.8)
Amortization 0.0 0.0
Disposals 0.0 0.0
Pre-tax impairment charge 76.1  
Mineral property, plant and equipment (84.9) (8.8)
Trillium | Gross carrying amount [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Additions   19.3
Trillium | Plant and Equipment [Member] | Gross carrying amount [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Additions   0.0
Trillium | Mineral property - non-depletable | Gross carrying amount [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Additions   0.0
Trillium | Mineral Property - Non-Depletable [Member] | Gross carrying amount [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Additions   0.0
Trillium | Exploration and evaluation | Gross carrying amount [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Additions   19.3
Island Gold [Member] | Gross carrying amount [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Additions 15.7 54.8
Island Gold [Member] | Plant and Equipment [Member] | Gross carrying amount [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Additions 0.0 0.0
Island Gold [Member] | Mineral property - non-depletable | Gross carrying amount [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Additions 15.7 54.8
Island Gold [Member] | Mineral Property - Non-Depletable [Member] | Gross carrying amount [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Additions 0.0 0.0
Island Gold [Member] | Exploration and evaluation | Gross carrying amount [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Additions $ 0.0 $ 0.0