Commitments and Contingencies - Contract Liability (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Business Combination [Line Items]
Revenue Recognized	$ 42,824	$ 55,562	$ 25,468
Franco-Nevada
Business Combination [Line Items]
Opening Balance	6,382	6,942	7,411
Revenue Recognized	(660)	(560)	(469)
Closing Balance	5,722	6,382	6,942
Kensington
Business Combination [Line Items]
Opening Balance	42,164	55,082	25,016
Additions	0	170,000	130,066
Revenue Recognized	(42,164)	(182,918)	(100,000)
Closing Balance	$ 0	$ 42,164	$ 55,082