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Segment disclosure - Disclosure of detailed information about geographic areas segment reporting, by country (Details) - CAD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of operating segments [line items]      
Royalty, stream and other interests $ 1,130,512 $ 1,414,668 $ 1,575,772
Royalties [Member]      
Disclosure of operating segments [line items]      
Royalty, stream and other interests 627,567 707,723 770,530
Streams [Member]      
Disclosure of operating segments [line items]      
Royalty, stream and other interests 483,164 606,410 700,078
Offtakes [Member]      
Disclosure of operating segments [line items]      
Royalty, stream and other interests 19,781 100,535 $ 105,164
North America [Member]      
Disclosure of operating segments [line items]      
Royalty, stream and other interests 761,279 970,595  
North America [Member] | Royalties [Member]      
Disclosure of operating segments [line items]      
Royalty, stream and other interests 560,246 643,193  
North America [Member] | Streams [Member]      
Disclosure of operating segments [line items]      
Royalty, stream and other interests 194,344 269,257  
North America [Member] | Offtakes [Member]      
Disclosure of operating segments [line items]      
Royalty, stream and other interests 6,689 58,145  
South America [Member]      
Disclosure of operating segments [line items]      
Royalty, stream and other interests 229,678 208,814  
South America [Member] | Royalties [Member]      
Disclosure of operating segments [line items]      
Royalty, stream and other interests 31,657 27,133  
South America [Member] | Streams [Member]      
Disclosure of operating segments [line items]      
Royalty, stream and other interests 198,021 181,681  
South America [Member] | Offtakes [Member]      
Disclosure of operating segments [line items]      
Royalty, stream and other interests 0 0  
Australia [Member]      
Disclosure of operating segments [line items]      
Royalty, stream and other interests 20,678 22,430  
Australia [Member] | Royalties [Member]      
Disclosure of operating segments [line items]      
Royalty, stream and other interests 9,961 10,002  
Australia [Member] | Streams [Member]      
Disclosure of operating segments [line items]      
Royalty, stream and other interests 2,435 3,524  
Australia [Member] | Offtakes [Member]      
Disclosure of operating segments [line items]      
Royalty, stream and other interests 8,282 8,904  
Africa [Member]      
Disclosure of operating segments [line items]      
Royalty, stream and other interests 10,488 12,180  
Africa [Member] | Royalties [Member]      
Disclosure of operating segments [line items]      
Royalty, stream and other interests 10,488 12,180  
Africa [Member] | Streams [Member]      
Disclosure of operating segments [line items]      
Royalty, stream and other interests 0 0  
Africa [Member] | Offtakes [Member]      
Disclosure of operating segments [line items]      
Royalty, stream and other interests 0 0  
Asia [Member]      
Disclosure of operating segments [line items]      
Royalty, stream and other interests 33,773 119,030  
Asia [Member] | Royalties [Member]      
Disclosure of operating segments [line items]      
Royalty, stream and other interests 0 0  
Asia [Member] | Streams [Member]      
Disclosure of operating segments [line items]      
Royalty, stream and other interests 28,963 85,544  
Asia [Member] | Offtakes [Member]      
Disclosure of operating segments [line items]      
Royalty, stream and other interests 4,810 33,486  
Europe [Member]      
Disclosure of operating segments [line items]      
Royalty, stream and other interests 74,616 81,619  
Europe [Member] | Royalties [Member]      
Disclosure of operating segments [line items]      
Royalty, stream and other interests 15,215 15,215  
Europe [Member] | Streams [Member]      
Disclosure of operating segments [line items]      
Royalty, stream and other interests 59,401 66,404  
Europe [Member] | Offtakes [Member]      
Disclosure of operating segments [line items]      
Royalty, stream and other interests $ 0 $ 0