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Segment Reporting - Interests (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) item	Dec. 31, 2019 USD ($) item
Interests
Number of major interests | item	3	2
Revenue	$ 1,020.2	$ 844.1
Major Interest One
Interests
Revenue	$ 360.7	$ 203.5
Percentage of revenue (as a percent)	13.00%	12.00%
Major Interest Two
Interests
Percentage of revenue (as a percent)	12.00%	12.00%
Major Interest Three
Interests
Percentage of revenue (as a percent)	10.00%

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- Definition

The number of major revenue generating Royalty, Stream and Working Interests.

+ References

No definition available.

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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- Definition

The percentage of the entity's revenue. [Refer: Revenue]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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