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COMMITMENTS - Royalties in Cost of Sales (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure Of Commitments [Line Items]    
Royalties $ 60,600,000 $ 59,200,000
Minimum | Gold, Ounces    
Disclosure Of Commitments [Line Items]    
Price per ounce of gold 1,000  
Maximum | Gold, Ounces    
Disclosure Of Commitments [Line Items]    
Price per ounce of gold 1,300  
IAMGOLD Essakane S.A. ("Essakane S.A.")    
Disclosure Of Commitments [Line Items]    
Royalties $ 40,700,000 36,800,000
Royalty percentage, conditional market price if market price is lower or equal to $1,000 per ounce 3.00%  
Royalty percentage, conditional market price if market price is between $1,000 and $1,300 per ounce 4.00%  
Royalty percentage, conditional market price if market price is great than $1,300 per ounce 5.00%  
Rosebel Gold Mines N.V.    
Disclosure Of Commitments [Line Items]    
Royalties $ 19,900,000 $ 22,400,000
In-kind royalty per ounce, percentage 2.00%  
Price participation percentage in excess of market price of $425 per ounce 6.50%  
Percent of minerals payable to charitable foundation 0.25%