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Royalty, stream and working interests - Key assumptions and sensitivity analysis (Details) - Streams - Mine Waste Solutions	Dec. 31, 2020 USD ($)
Royalty, stream and working interests
Change in discount rate assumption for impairment analysis (as a percent)	5.00%
Gold prices discount rate (as a percent)	10.00%
Discount Rate increase (Percentage)	1.00%
Discount Rate decrease (Percentage)	1.00%
2021
Royalty, stream and working interests
Gold price (US$/ounce)	$ 1,910
2022
Royalty, stream and working interests
Gold price (US$/ounce)	1,886
2023
Royalty, stream and working interests
Gold price (US$/ounce)	1,831
2024
Royalty, stream and working interests
Gold price (US$/ounce)	$ 1,681

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- Definition

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- Definition

The percent change in discount rate assumptions applied to discount rate in determining impairment.

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The gold price applied to cash flow projects.

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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