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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income taxes (Note 17) $ 12.2 $ 9.0  
Non-capital losses carried forward (760.6) (703.6)  
Deferred income tax liability 748.4 694.6 $ 660.9
Mineral property, plant and equipment      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income taxes (Note 17) 895.8 735.3  
Inventory capitalization      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income taxes (Note 17) 5.1 5.1  
Other deductible temporary differences      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Non-capital losses carried forward (97.1) (41.1)  
Non-capital losses carried forward      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Non-capital losses carried forward $ (55.4) $ (4.7)