v3.26.1
Income and mining taxes (Schedule of deferred taxes) (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 tax asset $ 66.5 $ 102.6  
Deferred tax liability (375.3) (340.4)  
Deferred income tax liability (308.8) (237.8) $ (255.3)
Income tax effect of temporary differences [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax asset 66.5 102.6  
Deferred tax liability (343.1) (305.5)  
Deferred income tax liability (276.6) (202.9)  
Mining tax effect of temporary differences recognized [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax liability $ (32.2) $ (34.9)