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INCOME TAX EXPENSE - Components of deferred tax (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income tax expense      
Deferred tax assets $ 253.1 $ 280.8  
Deferred tax liabilities - net 296.9 430.3 $ 485.1
Accrued expenses and other      
Income tax expense      
Deferred tax assets 103.6 49.0  
Deferred tax liabilities 0.5 1.3  
Property, plant and equipment [member]      
Income tax expense      
Deferred tax assets 0.4 1.8  
Deferred tax liabilities 507.5 662.7  
Reclamation and remediation obligations      
Income tax expense      
Deferred tax assets 74.2 118.6  
Inventory capitalization      
Income tax expense      
Deferred tax assets   20.6  
Deferred tax liabilities 42.0 47.1  
Non-capital loss      
Income tax expense      
Deferred tax assets $ 74.9 $ 90.8