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DISCONTINUED OPERATIONS - Loss on disposal (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2023 | Jun. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |
Working capital |  |  | $ (14.9) | $ (40.6) |
Cash and cash equivalents |  |  | 367.1 | 407.8 | $ 544.9
Receivables and other current assets |  |  | 85.7 | 128.0 |
Inventories |  |  | 266.3 | 199.9 |
Property, plant and equipment |  |  | 3,496.5 | 2,598.0 |
Other non-current assets |  |  | 76.3 | 128.8 |
Accounts payable and accrued liabilities |  |  | (317.6) | (294.1) |
Provisions |  |  | (5.4) | (5.6) |
Other liabilities |  |  | 0.0 | (1.0) |
Non-controlling interests |  |  | (58.1) | (76.0) |
Assets |  |  | 4,537.9 | 4,425.1 |
Discontinued operations |  |  |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |
Assets |  |  | $ 34.6 | $ 785.6 |
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 |  |  |  |
Working capital | (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) |  |  |  |
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 | $ 7.4 |  |  |

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