Commitments and Contingencies - Contract Liability (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Business Acquisition [Line Items]
Revenue Recognized	$ 118	$ 15,100	$ 55,277	$ 25,215
Franco-Nevada
Business Acquisition [Line Items]
Opening Balance	6,784	7,296	6,943	7,411
Revenue Recognized	(118)	(100)	(277)	(215)
Closing Balance	6,666	7,196	6,666	7,196
Kensington
Business Acquisition [Line Items]
Opening Balance	55,112	15,127	55,082	25,016
Additions	30,175	44,885	85,205	44,996
Revenue Recognized	(42,005)	(15,000)	(97,005)	(25,000)
Closing Balance	43,282	$ 45,012	43,282	$ 45,012
Kensington \| December 2023 Prepayment
Business Acquisition [Line Items]
Opening Balance	25,000
Closing Balance	$ 12,000		12,000
Wharf \| September 2023 Prepayment
Business Acquisition [Line Items]
Opening Balance			12,500
Rochester \| September 2023 Prepayment
Business Acquisition [Line Items]
Opening Balance			$ 17,500

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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