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PROVISIONS - Narrative (Details)
$ in Millions, $ in Millions
Dec. 31, 2021
USD ($)
Dec. 31, 2021
CAD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CAD ($)
Disclosure of other provisions [line items]        
Outstanding borrowing amount $ 1.7   $ 1.7  
Restricted cash 42.2   38.6  
IAMGOLD Essakane S.A. ("Essakane S.A.")        
Disclosure of other provisions [line items]        
Collateral, restricted cash guaranteeing asset retirement obligations     38.6  
Doyon division including the Westwood mine2        
Disclosure of other provisions [line items]        
Bonds outstanding to guarantee asset retirement obligations related to the Doyon division 132.3 $ 167.4 131.2 $ 167.4
Côté Gold Project        
Disclosure of other provisions [line items]        
Bonds outstanding to guarantee asset retirement obligations related to the Doyon division $ 37.8 $ 47.9 $ 37.6 $ 47.9