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Income and mining taxes - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Income and mining taxes [Line Items]    
Unused tax losses for which no deferred tax asset recognised $ 1,033.7 $ 761.3
Mining tax    
Income and mining taxes [Line Items]    
Unused tax losses for which no deferred tax asset recognised 362.4 $ 403.5
Canada    
Income and mining taxes [Line Items]    
Unused tax losses for which no deferred tax asset recognised 23.0  
MEXICO    
Income and mining taxes [Line Items]    
Unused tax losses for which no deferred tax asset recognised $ 74.5