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INCOME TAXES - Reconciliation Of Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Income Taxes [Abstract] |  |
Earnings (loss) before income taxes | $ 977.2 | $ 128.2
Income tax provision - 26.5% | 259.0 | 34.0
Increase (reduction) in income taxes resulting from: |  |
Earnings in foreign jurisdictions subject to a different tax rate than 26.5% | (36.5) | (31.9)
Permanent items that are not included in income (losses) for tax purposes: |  |
Non-deductible expenses | (4.4) | (0.9)
Income (losses) not recognized for tax purposes | 0.6 | (3.5)
Tax provisions not based on legal entity income or losses for the year: |  |
Provincial mining duty tax | 15.9 | 3.8
Non-resident withholding tax | 14.3 | 5.5
Under (over) tax provisions | 3.0 | 0.3
Changes in tax rates | 0.2 | 0.0
Other | 0.5 | 0.3
Other adjustments: |  |
Change in unrecognized deferred tax assets | (133.6) | 21.4
Foreign exchange related to deferred income taxes | 10.7 | (2.2)
Taxes paid relating to sale of assets | 0.0 | 4.1
Other | (0.3) | (0.2)
Total income tax expense (recovery) | $ 129.4 | $ 30.7
Applicable tax rate | 26.50% | 26.50%

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