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INCOME TAX EXPENSE - Reconciliation of tax rate (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Reconciliation of average effective tax rate and applicable tax rate    
Earnings before income tax $ 1,481.4 $ 708.6
Statutory Rate 26.50% 26.50%
Expected income tax expense $ 392.6 $ 187.8
Increase (decrease) resulting from:    
Foreign exchange on deferred income taxes within income tax expenses 86.4 29.3
Change in unrecognized deferred tax assets 46.8 21.4
Mining and State Taxes 36.6 6.2
Difference in foreign tax rates 15.4 20.9
Tax on (recovery from) repatriation of foreign earnings 6.0 (18.2)
True-up of prior provisions to tax filings 2.6 3.6
Tax impact on non-controlling interest (9.7)  
Percentage of depletion (11.7) (12.9)
Change in unrecognized deferred tax assets from impairment (reversal) charges (17.8) 8.8
Net accounting expenses (income) not deductible (taxable) for tax (21.8) 19.8
Change in income tax related uncertain tax positions (35.5) 22.3
Other (2.5) 4.2
Total tax expense $ 487.4 $ 293.2