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IMPAIRMENT CHARGES - Inventories (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Impairment charges    
Property, plant and equipment   $ 243.2
Fort Knox    
Impairment charges    
Impairment charge to adjust the inventories to net realizable value $ 38.9  
Impairment impact on tax recovery $ 3.1  
Round Mountain    
Impairment charges    
Impairment charge to adjust the inventories to net realizable value   106.8
Impairment impact on tax recovery   18.9
Property, plant and equipment   $ 243.2