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Segment Reporting - Interests (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) item	Dec. 31, 2018 USD ($) item
Interests
Number of major interests | item	2	2
Revenue	$ 844.1	$ 653.2
Major Interest One
Interests
Revenue	$ 103.1	$ 97.5
Percentage of revenue (as a percent)	12.00%	15.00%
Major Interest Two
Interests
Revenue	$ 100.4	$ 70.5
Percentage of revenue (as a percent)	12.00%	11.00%

X

- Definition

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

+ References

No definition available.

+ Details

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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.

+ References

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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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-IssueDate 2019-01-01
-Paragraph 34
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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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-IssueDate 2019-01-01
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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