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ASSETS AND LIABILITIES HELD FOR SALE - Disposal of senegal assets (Details) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Apr. 25, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |
Cash and cash equivalents |  | $ 347.5 | $ 367.1 | $ 407.8
Property, plant and equipment |  | 4,269.4 | 3,496.5 |
Other non-current assets |  | 135.7 | 76.3 |
Accounts payable and accrued liabilities |  | (264.8) | (317.6) |
Non-controlling interests |  | 64.0 | 58.1 |
Total Assets of IAMGOLD |  | 5,374.4 | 4,537.9 |
Pre-tax gain on sale of Senegal Assets |  | 0.0 | 6.3 |
Discontinued operations |  |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |
Total Assets of IAMGOLD |  | $ 0.0 | 34.6 |
Pre-tax gain on sale of Senegal Assets |  |  | $ 6.3 |
Discontinued operations | Senegal Assets |  |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |
Proceeds | $ 197.6 |  |  |
Transaction costs | (3.7) |  |  |
Proceeds received on closing | 193.9 |  |  |
Pre-tax gain on sale of Senegal Assets | 109.1 |  |  |
Discontinued operations | Senegal Assets | Assets and liabilities classified as held for sale |  |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |
Cash and cash equivalents | 1.4 |  |  |
Property, plant and equipment | 83.3 |  |  |
Other non-current assets | 1.1 |  |  |
Accounts payable and accrued liabilities | (0.6) |  |  |
Assets (liabilities) | 85.2 |  |  |
Non-controlling interests | (0.4) |  |  |
Total Assets of IAMGOLD | $ 84.8 |  |  |

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