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INCOME TAXES - Reconciliation Of Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
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%