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PROPERTY, PLANT AND EQUIPMENT - Disclosure of property, plant and equipment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Reconciliation of changes in property, plant and equipment [abstract]    
Balance, beginning of the year $ 2,598.0  
Reclassification to assets held for sale   $ (1,261.4)
Balance, end of the year $ 3,496.5 $ 2,598.0
Unincorporated Joint Venture    
Reconciliation of changes in property, plant and equipment [abstract]    
Proportion of voting rights held in joint venture 70.00%  
Unincorporated Joint Venture | Côté Gold [Member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Proportion of voting rights held in joint venture 70.00% 70.00%
Construction in progress    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance, beginning of the year $ 1,563.9  
Reclassification to assets held for sale   $ 0.0
Balance, end of the year 2,409.4 1,563.9
Mining properties    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance, beginning of the year 543.7  
Reclassification to assets held for sale   (749.1)
Balance, end of the year 599.9 543.7
Plant and equipment    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance, beginning of the year 419.3  
Reclassification to assets held for sale   (461.4)
Balance, end of the year 384.7 419.3
Right-of-use assets    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance, beginning of the year 71.1  
Reclassification to assets held for sale   (50.9)
Balance, end of the year 102.5 71.1
Gross carrying amount    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance, beginning of the year 5,654.3 6,470.1
Additions 1,141.3 1,036.7
Changes in asset retirement obligations 36.2 (22.4)
Changes to Right-of-use assets (29.4)  
Disposals (17.6) (54.4)
Transfers within property, plant and equipment 0.0 0.0
Reclassification to assets held for sale   (1,775.7)
Transfers from exploration & evaluation assets (11.1)  
Balance, end of the year 6,795.9 5,654.3
Gross carrying amount | Construction in progress    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance, beginning of the year 1,563.9 1,078.6
Additions 866.5 638.7
Changes in asset retirement obligations 0.0 0.0
Changes to Right-of-use assets (4.0)  
Disposals (5.5) 0.0
Transfers within property, plant and equipment (11.5) (73.8)
Reclassification to assets held for sale   (79.6)
Transfers from exploration & evaluation assets 0.0  
Balance, end of the year 2,409.4 1,563.9
Gross carrying amount | Mining properties    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance, beginning of the year 2,506.8 3,305.0
Additions 138.9 221.7
Changes in asset retirement obligations 36.2 (22.4)
Changes to Right-of-use assets 0.0  
Disposals 0.0 0.0
Transfers within property, plant and equipment (0.1) 25.1
Reclassification to assets held for sale   (1,022.6)
Transfers from exploration & evaluation assets (11.1)  
Balance, end of the year 2,692.9 2,506.8
Gross carrying amount | Plant and equipment    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance, beginning of the year 1,498.2 1,977.9
Additions 56.2 100.8
Changes in asset retirement obligations 0.0 0.0
Changes to Right-of-use assets 0.0  
Disposals (11.6) (49.6)
Transfers within property, plant and equipment 11.8 52.6
Reclassification to assets held for sale   (583.5)
Transfers from exploration & evaluation assets 0.0  
Balance, end of the year 1,554.6 1,498.2
Gross carrying amount | Right-of-use assets    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance, beginning of the year 85.4 108.6
Additions 79.7 75.5
Changes in asset retirement obligations 0.0 0.0
Changes to Right-of-use assets (25.4)  
Disposals (0.5) (4.8)
Transfers within property, plant and equipment (0.2) (3.9)
Reclassification to assets held for sale   (90.0)
Transfers from exploration & evaluation assets 0.0  
Balance, end of the year 139.0 85.4
Accumulated depreciation, amortization and impairment    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance, beginning of the year (3,056.3) (3,882.2)
Depreciation expense 254.9 326.6
Disposals 11.8 51.1
Impairment charge   160.0
Transfers within property, plant and equipment 0.0 0.0
Balance, end of the year (3,299.4) (3,056.3)
Accumulated depreciation, amortization and impairment | Construction in progress    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance, beginning of the year 0.0 0.0
Depreciation expense 0.0 0.0
Disposals 0.0 0.0
Impairment charge   0.0
Transfers within property, plant and equipment 0.0 0.0
Balance, end of the year 0.0 0.0
Accumulated depreciation, amortization and impairment | Mining properties    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance, beginning of the year (1,963.1) (2,419.3)
Depreciation expense 141.4 183.8
Disposals 0.0 0.0
Impairment charge   109.1
Transfers within property, plant and equipment (11.5) 0.0
Balance, end of the year (2,093.0) (1,963.1)
Accumulated depreciation, amortization and impairment | Plant and equipment    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance, beginning of the year (1,078.9) (1,418.6)
Depreciation expense 90.8 126.9
Disposals 11.3 46.7
Impairment charge   39.5
Transfers within property, plant and equipment 11.5 2.0
Balance, end of the year (1,169.9) (1,078.9)
Accumulated depreciation, amortization and impairment | Right-of-use assets    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance, beginning of the year (14.3) (44.3)
Depreciation expense 22.7 15.9
Disposals 0.5 4.4
Impairment charge   11.4
Transfers within property, plant and equipment 0.0 (2.0)
Balance, end of the year $ (36.5) $ (14.3)