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INCOME TAX EXPENSE - Components of deferred tax (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income tax expense      
Deferred tax assets $ 215.9 $ 183.2  
Deferred tax liabilities 759.6 620.4  
Deferred tax liabilities - net 543.7 437.2 $ 296.9
Accrued expenses and other      
Income tax expense      
Deferred tax assets 93.8 63.5  
Property, plant and equipment      
Income tax expense      
Deferred tax assets 4.8 5.8  
Deferred tax liabilities 694.2 581.1  
Reclamation and remediation obligations      
Income tax expense      
Deferred tax assets 116.6 105.9  
Deferred tax liabilities 0.1 2.6  
Inventory capitalization      
Income tax expense      
Deferred tax liabilities 65.3 36.7  
Losses      
Income tax expense      
Deferred tax assets $ 0.7 $ 8.0