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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Non-capital losses carried forward $ (660.9) $ (623.2)  
Deferred income tax liability 660.9 623.2 $ 559.9
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 683.0 653.4  
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 12.2 8.7  
Other deductible temporary differences      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Non-capital losses carried forward (34.2) (33.0)  
Non-capital losses carried forward      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Non-capital losses carried forward $ (0.1) $ (5.9)