v3.26.1
Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income taxes (Note 18) $ (34.0) $ (12.2)  
Non-capital losses carried forward (873.3) (760.6)  
Net deferred income tax liability 839.3 748.4 $ 694.6
Mineral property, plant and equipment      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income taxes (Note 18) (1,000.1) (895.8)  
Inventory capitalization      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income taxes (Note 18) (3.5) (5.1)  
Corporate minimum tax prepayment      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income taxes (Note 18) (25.3)  
Other deductible temporary differences      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Non-capital losses carried forward (110.4) (97.1)  
Non-capital losses carried forward      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Non-capital losses carried forward $ (28.6) $ (55.4)