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PROPERTY, PLANT AND EQUIPMENT - Disclosure of 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]    
Balance, beginning of the year $ 2,362.0  
Balance, end of the year 2,587.9 $ 2,362.0
Percent of assets and liabilities derecognized   30.00%
Gains on disposals of investments   $ 16.9
Construction in progress    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance, beginning of the year 624.8  
Balance, end of the year 1,078.6 624.8
Mining properties    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance, beginning of the year 1,021.8  
Balance, end of the year 885.7 1,021.8
Plant and equipment    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance, beginning of the year 642.6  
Balance, end of the year 559.3 642.6
Right-of-use assets1    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance, beginning of the year 72.8  
Balance, end of the year 64.3 72.8
Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance, beginning of the year 5,790.2 5,497.3
Additions 721.7 390.7
Changes in asset retirement obligations 42.0 7.6
Disposals (83.8) (70.0)
Derecognition on the establishment of the Rosebel UJV   (35.4)
Transfers within property, plant and equipment 0.0 0.0
Balance, end of the year 6,470.1 5,790.2
Cost | Construction in progress    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance, beginning of the year 624.8 504.2
Additions 474.8 164.2
Changes in asset retirement obligations 0.0 0.0
Disposals 0.0 0.0
Derecognition on the establishment of the Rosebel UJV   (2.0)
Transfers within property, plant and equipment (21.0) (41.6)
Balance, end of the year 1,078.6 624.8
Cost | Mining properties    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance, beginning of the year 3,106.6 2,961.0
Additions 142.3 130.4
Changes in asset retirement obligations 42.0 7.6
Disposals 0.0 0.0
Derecognition on the establishment of the Rosebel UJV   (32.1)
Transfers within property, plant and equipment 14.1 39.7
Balance, end of the year 3,305.0 3,106.6
Cost | Plant and equipment    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance, beginning of the year 1,966.6 1,964.0
Additions 83.2 70.0
Changes in asset retirement obligations 0.0 0.0
Disposals (79.4) (67.8)
Derecognition on the establishment of the Rosebel UJV   (1.3)
Transfers within property, plant and equipment 7.5 1.7
Balance, end of the year 1,977.9 1,966.6
Cost | Right-of-use assets1    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance, beginning of the year 92.2 68.1
Additions 21.4 26.1
Changes in asset retirement obligations 0.0 0.0
Disposals (4.4) (2.2)
Derecognition on the establishment of the Rosebel UJV   0.0
Transfers within property, plant and equipment (0.6) 0.2
Balance, end of the year 108.6 92.2
Accumulated Depreciation and Impairment    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance, beginning of the year (3,428.2) (3,257.7)
Depreciation expense 327.4 283.6
Disposals 78.5 67.1
Impairment charge 205.1  
Derecognition on the establishment of the Rosebel UJV   (0.2)
Reversal of impairment   (45.8)
Balance, end of the year (3,882.2) (3,428.2)
Accumulated Depreciation 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  
Derecognition on the establishment of the Rosebel UJV   0.0
Reversal of impairment   0.0
Balance, end of the year 0.0 0.0
Accumulated Depreciation and Impairment | Mining properties    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance, beginning of the year (2,084.8) (1,987.4)
Depreciation expense 180.4 143.3
Disposals 0.0 0.0
Impairment charge 154.1  
Derecognition on the establishment of the Rosebel UJV   (0.1)
Reversal of impairment   (45.8)
Balance, end of the year (2,419.3) (2,084.8)
Accumulated Depreciation and Impairment | Plant and equipment    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance, beginning of the year (1,324.0) (1,261.8)
Depreciation expense 131.6 127.8
Disposals 74.3 65.5
Impairment charge 37.3  
Derecognition on the establishment of the Rosebel UJV   (0.1)
Reversal of impairment   0.0
Balance, end of the year (1,418.6) (1,324.0)
Accumulated Depreciation and Impairment | Right-of-use assets1    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance, beginning of the year (19.4) (8.5)
Depreciation expense 15.4 12.5
Disposals 4.2 1.6
Impairment charge 13.7  
Derecognition on the establishment of the Rosebel UJV   0.0
Reversal of impairment   0.0
Balance, end of the year $ (44.3) $ (19.4)