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DISCONTINUED OPERATIONS - Loss on disposal (Details) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |
Movements in non-cash working capital items and non-current ore stockpiles |  | $ (114.4) | $ (14.9) |
Cash and cash equivalents |  | 347.5 | 367.1 | $ 407.8
Receivables and other current assets |  | 48.9 | 85.7 |
Inventories |  | 271.9 | 266.3 |
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) |
Current portion of provisions |  | (14.5) | (5.4) |
Non-controlling interests |  | (64.0) | (58.1) |
Assets |  | 5,374.4 | 4,537.9 |
Discontinued operations |  |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |
Assets |  | $ 0.0 | $ 34.6 |
Discontinued operations | Disposal of major subsidiary | Rosebel Mine |  |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |
Proceeds received on closing | $ 360.0 |  |  |
Cash and cash equivalents transferred since closing | 39.4 |  |  |
Movements in non-cash working capital items and non-current ore stockpiles | (3.4) |  |  |
Transaction costs | (8.7) |  |  |
Net proceeds | 387.3 |  |  |
Cash and cash equivalents | 39.8 |  |  |
Receivables and other current assets | 26.7 |  |  |
Inventories | 153.7 |  |  |
Property, plant and equipment | 446.2 |  |  |
Other non-current assets | 10.5 |  |  |
Accounts payable and accrued liabilities | (76.0) |  |  |
Current portion of provisions | (103.8) |  |  |
Other liabilities | (89.1) |  |  |
Net carrying amount | 408.0 |  |  |
Non-controlling interests | (13.3) |  |  |
Assets | 394.7 |  |  |
Loss on sale of Rosebel | $ 7.4 |  |  |

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