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Royalty, stream and working interests - Impairments of Royalties, Streams and Working Interests (Details) |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) $ / bbl $ / $ | Nov. 13, 2012
Royalty, stream and working interests |  |  |  |
Impairment of royalty, streams and working interests | $ 271,700,000 | $ 271,700,000 | $ 262,100,000 |
Recoverable amount | 476,700,000 | 476,700,000 |  |
Edmonton Light prices (in US $/ barrels) | $ / bbl |  |  | 8.55 |
Exchange rate (US $ / Canadian dollar) | $ / $ |  |  | 0.72 |
WTI oil price increase (as percentage) |  |  | 2.00% |
Increase (Decrease) to impairment charges due to 1% increase in discount rate |  |  | $ 51,000,000 |
Increase (Decrease) to impairment charges due to 1% decrease in discount rate |  |  | (59,000,000) |
Increase (Decrease) to impairment charges due to 10% increase in WTI oil prices |  |  | (76,300,000) |
Increase (Decrease) to impairment charges due to 10% decrease in WTI oil prices |  |  | 77,600,000 |
Remainder of 2020 |  |  |  |
Royalty, stream and working interests |  |  |  |
WTI oil price (in US $/ barrels) |  |  | 30.00 |
2021 |  |  |  |
Royalty, stream and working interests |  |  |  |
WTI oil price (in US $/ barrels) |  |  | 41.18 |
2022 |  |  |  |
Royalty, stream and working interests |  |  |  |
WTI oil price (in US $/ barrels) |  |  | 49.88 |
2023 |  |  |  |
Royalty, stream and working interests |  |  |  |
WTI oil price (in US $/ barrels) |  |  | 55.87 |
2024 |  |  |  |
Royalty, stream and working interests |  |  |  |
WTI oil price (in US $/ barrels) |  |  | 57.98 |
SCOOP/STACK |  |  |  |
Royalty, stream and working interests |  |  |  |
Impairment of royalty, streams and working interests |  | 207,200,000 |  |
Recoverable amount | 309,200,000 | 309,200,000 |  |
Increase (Decrease) to impairment charges due to 1% increase in discount rate |  |  | 34,100,000 |
Increase (Decrease) to impairment charges due to 1% decrease in discount rate |  |  | (39,900,000) |
Increase (Decrease) to impairment charges due to 10% increase in WTI oil prices |  |  | (37,300,000) |
Increase (Decrease) to impairment charges due to 10% decrease in WTI oil prices |  |  | $ 37,800,000 |
Weyburn |  |  |  |
Royalty, stream and working interests |  |  |  |
Percentage of NRI |  |  |  | 11.71%
Percentage of ORR |  |  | 0.44% |
Percentage of WI |  |  | 2.56% |
Impairment of royalty, streams and working interests |  | 60,500,000 |  |
Recoverable amount | 162,800,000 | 162,800,000 |  |
Change in discount rate assumption for impairment analysis (as a percent) |  |  | 9.50% |
Oil well equipment |  |  |  |
Royalty, stream and working interests |  |  |  |
Impairment of royalty, streams and working interests |  | 4,000,000 |  |
Recoverable amount | $ 4,700,000 | $ 4,700,000 |  |
Weyburn and oil well equipment |  |  |  |
Royalty, stream and working interests |  |  |  |
Increase (Decrease) to impairment charges due to 1% increase in discount rate |  |  | $ 16,900,000 |
Increase (Decrease) to impairment charges due to 1% decrease in discount rate |  |  | (19,100,000) |
Increase (Decrease) to impairment charges due to 10% increase in WTI oil prices |  |  | (39,000,000) |
Increase (Decrease) to impairment charges due to 10% decrease in WTI oil prices |  |  | $ 39,800,000 |
Bottom | SCOOP/STACK |  |  |  |
Royalty, stream and working interests |  |  |  |
Change in discount rate assumption for impairment analysis (as a percent) |  |  | 5.00% |
Top | SCOOP/STACK |  |  |  |
Royalty, stream and working interests |  |  |  |
Change in discount rate assumption for impairment analysis (as a percent) |  |  | 12.00% |

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