Commitments and Contingencies - Contract Liability (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Business Acquisition [Line Items]
Revenue Recognized	$ 130	$ 143	$ 55,407	$ 25,358
Franco-Nevada
Business Acquisition [Line Items]
Opening Balance	6,666	7,196	6,942	7,411
Revenue Recognized	(129)	(145)	(405)	(360)
Closing Balance	6,537	7,051	6,537	7,051
Kensington
Business Acquisition [Line Items]
Opening Balance	43,282	45,012	55,082	25,016
Additions	54,828	30,311	140,033	75,307
Revenue Recognized	(43,030)	(31,000)	(140,035)	(56,000)
Closing Balance	55,080	44,323	55,080	44,323
Kensington \| December 2023 Prepayment
Business Acquisition [Line Items]
Closing Balance	$ 25,000		$ 25,000
Wharf \| September 2023 Prepayment
Business Acquisition [Line Items]
Closing Balance		12,500		12,500
Rochester \| September 2023 Prepayment
Business Acquisition [Line Items]
Closing Balance		$ 17,500		$ 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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-Section 50
-Paragraph 5
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-Publisher FASB
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479837/606-10-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
-Paragraph 8
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Section 45
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-Publisher FASB
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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