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IMPAIRMENT CHARGES, NET OF REVERSAL (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of impairment loss and reversal of impairment loss [line items]    
Impairment charge $ 205.1 $ (45.8)
Plant and equipment | Rosebel Gold mines    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Impairment charge   0.0
Plant and equipment | IAMGOLD Essakane S.A. ("Essakane S.A.")    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Impairment charge $ 0.0 $ (45.8)