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INCOME TAX EXPENSE - Components of deferred tax (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income tax expense      
Deferred tax assets $ 280.8 $ 254.8  
Deferred tax liabilities - net 430.3 485.1 $ 269.3
Accrued expenses and other      
Income tax expense      
Deferred tax assets 49.0 51.1  
Deferred tax liabilities 1.3 2.4  
Property, plant and equipment [member]      
Income tax expense      
Deferred tax assets 1.8 5.2  
Deferred tax liabilities 662.7 677.5  
Reclamation and remediation obligations      
Income tax expense      
Deferred tax assets 118.6 123.3  
Inventory capitalization      
Income tax expense      
Deferred tax assets 20.6 20.8  
Deferred tax liabilities 47.1 60.0  
Non-capital loss      
Income tax expense      
Deferred tax assets $ 90.8 $ 54.4