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EXPLORATION AND EVALUATION ASSETS (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  
Exploration and evaluation expenditures 26.3 $ 28.4
Balance, end of the year 3,496.5 2,598.0
Exploration and evaluation assets    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance, beginning of the year 28.3 61.7
Reclassification to assets held for sale   (34.1)
Transfers within property, plant and equipment (11.1)  
Impairment charge (1.3) (1.2)
Transfers from exploration & evaluation assets (1.5) 0.0
Exploration and evaluation expenditures   1.9
Balance, end of the year 14.4 28.3
Exploration and evaluation assets | Diakha-Siribaya Gold project    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance, beginning of the year 0.0 36.6
Reclassification to assets held for sale   (34.1)
Transfers within property, plant and equipment 0.0  
Impairment charge 0.0 (1.2)
Transfers from exploration & evaluation assets 0.0 (1.3)
Exploration and evaluation expenditures   0.0
Balance, end of the year 0.0 0.0
Exploration and evaluation assets | Fayolle property    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance, beginning of the year 11.1 9.2
Reclassification to assets held for sale   0.0
Transfers within property, plant and equipment (11.1)  
Impairment charge 0.0 0.0
Transfers from exploration & evaluation assets 0.0 0.0
Exploration and evaluation expenditures   1.9
Balance, end of the year 0.0 11.1
Exploration and evaluation assets | Monster Lake project    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance, beginning of the year 7.8 7.8
Reclassification to assets held for sale   0.0
Transfers within property, plant and equipment 0.0  
Impairment charge 0.0 0.0
Transfers from exploration & evaluation assets 0.0 0.0
Exploration and evaluation expenditures   0.0
Balance, end of the year 7.8 7.8
Exploration and evaluation assets | Gosselin    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance, beginning of the year 5.0 5.0
Reclassification to assets held for sale   0.0
Transfers within property, plant and equipment 0.0  
Impairment charge 0.0 0.0
Transfers from exploration & evaluation assets (1.5) 0.0
Exploration and evaluation expenditures   0.0
Balance, end of the year 3.5 5.0
Exploration and evaluation assets | Nelligan    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance, beginning of the year 1.8 1.8
Reclassification to assets held for sale   0.0
Transfers within property, plant and equipment 0.0  
Impairment charge 0.0 0.0
Transfers from exploration & evaluation assets 0.0 0.0
Exploration and evaluation expenditures   0.0
Balance, end of the year 1.8 1.8
Exploration and evaluation assets | Other    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance, beginning of the year 2.6 1.3
Reclassification to assets held for sale   0.0
Transfers within property, plant and equipment 0.0  
Impairment charge (1.3) 0.0
Transfers from exploration & evaluation assets 0.0 1.3
Exploration and evaluation expenditures   0.0
Balance, end of the year $ 1.3 $ 2.6