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IMPAIRMENT CHARGES (REVERSALS) AND ASSET DERECOGNITION - NET (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Reversal of impairment charges    
Impairment charges $ 144.5  
Reversals and asset derecognition   $ 650.9
Accumulated depreciation, depletion, amortization and impairment    
Reversal of impairment charges    
Inventories (i) 95.2 38.1
Property, plant and equipment (ii)   (689.0)
Derecognition 99.2  
Impairment charges 144.5  
Reversals and asset derecognition   $ (650.9)
KG Mining (Bald Mountain) Inc.    
Reversal of impairment charges    
Derecognition 49.3  
KG Mining (Bald Mountain) Inc. | Accumulated depreciation, depletion, amortization and impairment    
Reversal of impairment charges    
Derecognition $ 49.3