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OTHER (INCOME) EXPENSES (Tables) | 12 Months Ended
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Dec. 31, 2024
Analysis of income and expense [abstract] |
Disclosure of Other (Income) Expenses |
|  |  | Years ended December 31,
| Notes |  |  | 2024 | 2023
Changes in asset retirement obligations at closed mines | 14(a) |  |  | $ | (13.4) |  | $ | 9.7 |
Write-down of assets |  |  |  | 0.9 |  | 1.3 |
Forfeiture of carbon fines | 14(b) |  |  | — |  | 13.5 |
Settlement of carbon fines | 14(b) |  |  | — |  | 15.0 |
Other |  |  |  | 3.3 |  | 7.8 |
|  |  |  | $ | (9.2) |  | $ | 47.3 |

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