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Segment disclosure (Narrative) (Details) - CAD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of operating segments [line items]    
Royalty, stream and other interest revenue $ 224,877 $ 213,630
North America from Canada [Member]    
Disclosure of operating segments [line items]    
Percentage of entity's revenue 83.00% 65.00%
Percentage of North America's net interests 82.00% 86.00%
One royalty interest [Member]    
Disclosure of operating segments [line items]    
Royalty, stream and other interest revenue $ 81,300 $ 66,800
Percentage of entity's revenue 41.00% 43.00%
Precious metals [Member]    
Disclosure of operating segments [line items]    
Percentage of entity's revenue 89.00% 94.00%
Precious metals [Member] | Excluding offtakes [Member]    
Disclosure of operating segments [line items]    
Percentage of entity's revenue 87.00% 92.00%
Diamonds [Member]    
Disclosure of operating segments [line items]    
Percentage of entity's revenue 9.00% 4.00%
Diamonds [Member] | Excluding offtakes [Member]    
Disclosure of operating segments [line items]    
Percentage of entity's revenue 11.00% 6.00%