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Segment disclosure (Narrative) (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure of operating segments [line items] |  |
Royalty, stream and other interest revenue | $ 392,599 | $ 490,472
Percentage of net interests from North America located in Canada and the United States | 96.00% | 97.00%
One royalty interest [Member] |  |
Disclosure of operating segments [line items] |  |
Royalty, stream and other interest revenue | $ 61,100 | $ 58,500
Percentage of entity's revenue | 44.00% | 46.00%
Precious metals |  |
Disclosure of operating segments [line items] |  |
Percentage of entity's revenue | 94.00% | 96.00%
Precious metals | Excluding offtakes |  |
Disclosure of operating segments [line items] |  |
Percentage of entity's revenue | 84.00% | 85.00%
Diamonds |  |
Disclosure of operating segments [line items] |  |
Percentage of entity's revenue | 5.00% | 3.00%
Diamonds | Excluding offtakes |  |
Disclosure of operating segments [line items] |  |
Percentage of entity's revenue | 13.00% | 11.00%
North American revenues from Canada and the United States |  |
Disclosure of operating segments [line items] |  |
Percentage of entity's revenue | 89.00% | 94.00%

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