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IMPAIRMENT CHARGES, NET OF REVERSAL - Narrative (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) $ / oz | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Price of gold, year one and two ($ per ounce) | $ / oz | 1,750 |  |
Price of gold, year three to year four ($ per ounce) | $ / oz | 1,700 |  |
Price of gold, thereafter ($ per ounce) | $ / oz | 1,500 |  |
Value of un-modeled mineralization for cash generating units ($ per ounce) | $ / oz | 45 |  |
Impairment charge | $ 205.1 | $ (45.8) |
Property, plant and equipment | 2,587.9 | 2,362.0 |
IAMGOLD Essakane S.A. ("Essakane S.A.") |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Reversal of impairment loss recognised in profit or loss |  | 45.8 |
IAMGOLD Essakane S.A. ("Essakane S.A.") | Plant and equipment |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Impairment charge | $ 0.0 | (45.8) |
Rosebel CGU |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Real weighted average costs of capital | 0.070 |  |
Rosebel CGU | Plant and equipment |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Recoverable amount | $ 373.8 |  |
Impairment charge | 205.1 |  |
Post tax impairment charge | $ 132.9 |  |
Doyon division including the Westwood mine2 |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Real weighted average costs of capital | 0.070 |  |
Côté Gold Project |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Real weighted average costs of capital | 0.055 |  |
Plant and equipment |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Property, plant and equipment | $ 559.3 | 642.6 |
Cost |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Property, plant and equipment | 6,470.1 | 5,790.2 | $ 5,497.3
Cost | Plant and equipment |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Property, plant and equipment | 1,977.9 | $ 1,966.6 | $ 1,964.0
Cost | Plant and equipment | IAMGOLD Essakane S.A. ("Essakane S.A.") |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Property, plant and equipment | $ 701.6 |  |

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