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INCOME AND MINING TAXES - Deferred income tax (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
DEFERRED TAX LIABILITIES      
Deferred tax liabilities $ (48.3) $ (56.3)  
Deferred tax assets and liabilities      
Deferred income tax liabilities, net (48.3) (56.3) $ (78.0)
Canada [Member]      
Deferred tax assets      
Deferred tax assets 255.3 261.4  
DEFERRED TAX LIABILITIES      
Deferred tax liabilities (48.3) (56.3)  
Unrecognized Deferred Tax Assets (255.3) (261.4)  
Deferred tax assets and liabilities      
Deferred income tax liabilities, net (48.3) (56.3)  
Canada [Member] | Capital Losses [Member]      
Deferred tax assets      
Deferred tax assets 18.4 37.1  
Canada [Member] | Property, plant and equipment and Mining interests [Member]      
Deferred tax assets      
Deferred tax assets 122.7 110.8  
Canada [Member] | Tax credits [Member]      
Deferred tax assets      
Deferred tax assets 49.9 47.5  
Canada [Member] | Ontario Mining Tax [Member]      
Deferred tax assets      
Deferred tax assets 45.4 53.9  
Canada [Member] | Other deferred tax assets [Member]      
Deferred tax assets      
Deferred tax assets 18.9 12.1  
Canada [Member] | British Columbia Mining Tax [Member]      
DEFERRED TAX LIABILITIES      
Deferred tax liabilities $ (48.3) $ (56.3)