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INCOME TAXES - Deferred Income Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets and liabilities [abstract]      
Deferred income tax assets $ 0.0 $ 0.0  
Deferred income tax liabilities (61.2) (168.8)  
Net deferred income tax liabilities (61.2) (168.8) $ (180.6)
Deductible temporary differences for which no deferred tax asset is recognised 1,818.5 1,831.3  
Before Offset Amount      
Deferred tax assets and liabilities [abstract]      
Deferred income tax assets 249.3 90.6  
Deferred income tax liabilities (310.5) (259.4)  
Non-capital losses      
Deferred tax assets and liabilities [abstract]      
Deferred income tax assets 210.4 58.6 22.5
Deductible temporary differences for which no deferred tax asset is recognised 457.2 886.1  
Non-capital losses | Before Offset Amount      
Deferred tax assets and liabilities [abstract]      
Deferred income tax assets 210.4 58.6  
Asset retirement obligations      
Deferred tax assets and liabilities [abstract]      
Deferred income tax assets 1.7 1.2 0.0
Deductible temporary differences for which no deferred tax asset is recognised 254.2 186.5  
Asset retirement obligations | Before Offset Amount      
Deferred tax assets and liabilities [abstract]      
Deferred income tax assets 1.7 1.2  
Other assets | Before Offset Amount      
Deferred tax assets and liabilities [abstract]      
Deferred income tax assets 37.2 30.8  
Property, plant and equipment      
Deferred tax assets and liabilities [abstract]      
Deferred income tax liabilities (281.0) (225.6) (197.1)
Property, plant and equipment | Before Offset Amount      
Deferred tax assets and liabilities [abstract]      
Deferred income tax liabilities (281.0) (225.6)  
Royalty interests      
Deferred tax assets and liabilities [abstract]      
Deferred income tax liabilities (0.4) (4.6) (5.3)
Royalty interests | Before Offset Amount      
Deferred tax assets and liabilities [abstract]      
Deferred income tax liabilities (0.4) (4.6)  
Marketable securities      
Deferred tax assets and liabilities [abstract]      
Deferred income tax liabilities 0.0 (0.2) 0.0
Marketable securities | Before Offset Amount      
Deferred tax assets and liabilities [abstract]      
Deferred income tax liabilities 0.0 (0.2)  
Inventory and reserves      
Deferred tax assets and liabilities [abstract]      
Deferred income tax liabilities (7.4) (18.5) (26.4)
Inventory and reserves | Before Offset Amount      
Deferred tax assets and liabilities [abstract]      
Deferred income tax liabilities (7.4) (18.5)  
Other liabilities      
Deferred tax assets and liabilities [abstract]      
Deferred income tax liabilities (21.7) (10.5) (2.4)
Other liabilities | Before Offset Amount      
Deferred tax assets and liabilities [abstract]      
Deferred income tax liabilities (21.7) (10.5)  
Net capital losses      
Deferred tax assets and liabilities [abstract]      
Deductible temporary differences for which no deferred tax asset is recognised 67.9 77.7  
Exploration and evaluation assets      
Deferred tax assets and liabilities [abstract]      
Deductible temporary differences for which no deferred tax asset is recognised 996.0 638.3  
Mining duties      
Deferred tax assets and liabilities [abstract]      
Deductible temporary differences for which no deferred tax asset is recognised 13.8 13.5  
Other deductible temporary differences      
Deferred tax assets and liabilities [abstract]      
Deferred income tax assets 37.2 30.8 $ 28.1
Deductible temporary differences for which no deferred tax asset is recognised $ 29.4 $ 29.2