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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Sep. 23, 2020
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Reversal of impairment loss | $ 462.3 |  |  |
Quoted borrowing costs capitalised |  | $ 98.5 | $ 113.5 |
Borrowing costs capitalized, weighted average interest rate |  | 8.90% | 7.38% |
Mining properties |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Mining properties, stripping costs capitalized |  | $ 319.1 | $ 199.2 |
Mining properties, stripping costs capitalized during period |  | 181.4 | 87.9 |
Mining properties, stripping costs, depreciation expense |  | $ 61.5 | $ 85.3 |
5.75% senior notes | Fixed interest rate |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Interest rate |  | 5.75% |  | 5.75%
Côté Gold |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Proportion of voting rights held in joint venture |  | 70.00% |  |

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