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Significant accounting policies - Impact of recent global and market developments on oil and gas prices (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Mar. 31, 2020 | Jun. 30, 2020
Significant accounting policies |  |
Impairment of royalty, streams and working interests | $ 271.7 | $ 271.7

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