STREAM AND ROYALTY INTERESTS, NET - Narrative (Details)		3 Months Ended		6 Months Ended		8 Months Ended
	May 25, 2026 USD ($) oz shares	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($)	May 24, 2026 USD ($)	Dec. 31, 2025 USD ($)
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items]
Gain on settlement of Relief Canyon fixed obligation		$ 2,575,000	$ 0	$ 2,575,000	$ 0
Total stream and royalty interests, net		8,600,469,000		8,600,469,000		$ 8,600,469,000		$ 8,583,875,000
Marketable securities		132,087,000		$ 132,087,000		132,087,000		$ 120,814,000
Sandstorm and Horizon
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items]
Stream and royalty interests acquired, measurement period adjustments		$ 120,000,000.0				$ 120,048,000
Americas Gold And Silver Corporation
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items]
Investment owned, balance (in shares) | shares	2,652,532
Marketable securities	$ 15,500,000
Relief Canyon
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items]
Gain on settlement of Relief Canyon fixed obligation	2,600,000
Total stream and royalty interests, net	$ 0						$ 12,900,000
Relief Canyon | Americas Gold And Silver Corporation
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items]
Investment owned, balance (in shares) | shares	2,652,532
Americas Gold And Silver Corporation | Relief Canyon
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items]
Delivery obligations, ounces | oz	5,000