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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
	Mar. 31, 2020	Jun. 30, 2020
Significant accounting policies
Impairment of royalty, streams and working interests	$ 271.7	$ 271.7

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- References

No definition available.

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- Definition

The amount of impairment loss recognised in profit or loss. [Refer: Impairment loss; Profit (loss)]

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