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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% |

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