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INCOME TAX EXPENSE (RECOVERY) - Components of deferred tax (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income tax expense      
Deferred tax assets $ 190.1 $ 158.1  
Deferred tax liabilities - net 269.3 220.2 $ 222.3
Accrued expenses and other      
Income tax expense      
Deferred tax assets 29.2 39.5  
Deferred tax liabilities 2.7 2.4  
Property, plant and equipment      
Income tax expense      
Deferred tax assets 26.3 25.5  
Deferred tax liabilities 423.4 340.2  
Reclamation and remediation obligations      
Income tax expense      
Deferred tax assets 88.4 69.5  
Deferred tax liabilities 2.8    
Inventory capitalization      
Income tax expense      
Deferred tax assets 11.5 4.3  
Deferred tax liabilities 30.5 35.7  
Non-capital loss      
Income tax expense      
Deferred tax assets $ 34.7 $ 19.3