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Royalty, Stream and Working Interests, Net - Impairments of Royalties, Streams and Working Interests (Details)	12 Months Ended
	Dec. 31, 2018 USD ($) item	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2016
Impairments
Number of assets with impairment indicators. | item	3
Impairment loss recognized	$ 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 loss recognized	$ 54,400,000
Recoverable amount of cash generating unit	3,600,000
Podolsky
Impairments
Impairment loss recognized	21,000,000
Recoverable amount of cash generating unit	0
McCreedy
Impairments
Recoverable amount of cash generating unit	11,000,000
Exploration assets
Impairments
Impairment loss recognized	$ 600,000
Key assumptions in the impairment testing analysis
Impairments
Long term gold price (in dollars per ounce)		$ 1,318	$ 1,284
Long term platinum price (in dollars per ounce)		931	864
Long term palladium price (in dollars per ounce)		$ 1,137	$ 1,184

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

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The percent change in gold price assumptions applied to cash flow projection in determining impairment.

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The discount rate applied to impairment analysis.

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The long-term gold price applied to impairment analysis.

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The long-term palladium price applied to impairment analysis.

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The long-term platinum price applied to impairment analysis.

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Represents the number of assets with impairment indicators.

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Recoverable amount of cash generating unit.

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

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