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Income taxes - Deductible Temporary Difference, losses and Unused Tax Credits (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Disclosure of temporary difference and unused tax credits  
Unused tax credits for which no deferred tax asset recognised $ 48.7
Royalty, stream and working interests.  
Disclosure of temporary difference and unused tax credits  
Unused tax credits for which no deferred tax asset recognised 25.1
Tax losses (expiry dates - 2029-2033)  
Disclosure of temporary difference and unused tax credits  
Unused tax credits for which no deferred tax asset recognised $ 23.6