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Royalty, stream and working interests - Impairments of Royalties, Streams and Working Interests (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 USD ($) item | Dec. 31, 2018 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2016
Impairments |  |  |  |
Number of assets with impairment indicators. | item | 3 |  |  |
Impairment of royalty, streams and working interests |  | $ 76,000,000 |  |
Discount rate (as a percent) |  |  |  | 5.00%
Change in gold price assumption for impairment analysis (as a percent) | 10.00% |  |  |
Change in gold price assumption (as a percent) | 10.00% |  |  |
Change in discount rate assumption for impairment analysis (as a percent) |  |  |  | 3.00%
Levack-Morrison |  |  |  |
Impairments |  |  |  |
Impairment of royalty, streams and working interests |  | 54,400,000 |  |
Recoverable amount of cash generating unit | $ 3,600,000 |  |  |
Podolsky |  |  |  |
Impairments |  |  |  |
Impairment of royalty, streams and working interests |  | 21,000,000 |  |
Recoverable amount of cash generating unit | 0 |  |  |
McCreedy-West |  |  |  |
Impairments |  |  |  |
Recoverable amount of cash generating unit | 11,000,000 |  |  |
Exploration assets |  |  |  |
Impairments |  |  |  |
Impairment of royalty, streams and working interests |  | $ 600,000 |  |
Key assumptions in the impairment testing analysis |  |  |  |
Impairments |  |  |  |
Long term gold price (in dollars per ounce) | 1,284 |  | $ 1,318 |
Long term platinum price (in dollars per ounce) | 864 |  | 931 |
Long term palladium price (in dollars per ounce) | $ 1,184 |  | $ 1,137 |

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