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OTHER EXPENSES (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Analysis of income and expense [abstract] |  |
Changes in asset retirement obligations at closed mines | $ 9.7 | $ 1.6
Write-down of assets | 1.3 | 0.6
Forfeiture of carbon fines | 13.5 | 0.0
Settlement of carbon fines | 15.0 | 0.0
Other | 10.0 | 6.9
Other expenses | $ 49.5 | $ 9.1

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