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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Non-capital losses carried forward $ (623.2) $ (559.9)  
Deferred income tax liability 623.2 559.9 $ 513.7
Accounting value of mineral property, plant and equipment in excess of tax value      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 653.4 591.8  
Accounting value of inventories in excess of tax value      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 8.7 8.8  
Other deductible temporary differences      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Non-capital losses carried forward (33.0) (25.5)  
Non-capital losses carried forward      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Non-capital losses carried forward $ (5.9) $ (15.2)