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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income taxes (note 12) $ 9.0 $ 0.0  
Non-capital losses carried forward (703.6) (660.9)  
Deferred income tax liability 694.6 660.9 $ 623.2
Mineral property, plant and equipment      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income taxes (note 12) 735.3 683.0  
Inventory capitalization      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income taxes (note 12) 5.1 12.2  
Other deductible temporary differences      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Non-capital losses carried forward (41.1) (34.2)  
Non-capital losses carried forward      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Non-capital losses carried forward $ (4.7) $ (0.1)