SEGMENT INFORMATION - Schedule of Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($) segment	Jun. 30, 2025 USD ($)	Dec. 31, 2025 USD ($)
Long Lived Assets and Pre-Tax Income by Geographical Information
Number of reportable segments | segment			2
Total stream and royalty interests, net	$ 8,600,469		$ 8,600,469		$ 8,583,875
Revenue	450,539	$ 209,643	919,664	$ 403,080
Cost of sales	60,094	24,180	120,431	48,685
Production taxes	3,437	2,201	6,729	3,962
Depletion	95,928	31,069	186,531	63,986
Segment gross profit	291,080	152,193	605,973	286,447
Stream interest
Long Lived Assets and Pre-Tax Income by Geographical Information
Total stream and royalty interests, net	4,530,970		4,530,970		4,544,742
Revenue	310,964	133,191	623,741	255,673
Cost of sales	60,094	24,180	120,431	48,685
Production taxes	0	0	0	0
Depletion	62,090	19,269	115,665	39,623
Segment gross profit	188,780	89,742	387,645	167,365
Royalty interest
Long Lived Assets and Pre-Tax Income by Geographical Information
Total stream and royalty interests, net	4,069,499		4,069,499		4,039,133
Revenue	139,575	76,452	295,923	147,407
Cost of sales	0	0	0	0
Production taxes	3,437	2,201	6,729	3,962
Depletion	33,838	11,800	70,866	24,363
Segment gross profit	102,300	62,451	218,328	119,082
North America
Long Lived Assets and Pre-Tax Income by Geographical Information
Total stream and royalty interests, net	2,975,322		2,975,322		3,049,731
North America | Stream interest
Long Lived Assets and Pre-Tax Income by Geographical Information
Total stream and royalty interests, net	1,168,007		1,168,007		1,214,810
Revenue	165,742	98,369	329,005	180,349
North America | Royalty interest
Long Lived Assets and Pre-Tax Income by Geographical Information
Total stream and royalty interests, net	1,807,315		1,807,315		1,834,921
Revenue	84,639	61,941	179,373	120,731
South and Central America
Long Lived Assets and Pre-Tax Income by Geographical Information
Total stream and royalty interests, net	3,039,758		3,039,758		2,891,831
South and Central America | Stream interest
Long Lived Assets and Pre-Tax Income by Geographical Information
Total stream and royalty interests, net	1,098,533		1,098,533		1,045,620
Revenue	63,868	14,435	132,822	32,556
South and Central America | Royalty interest
Long Lived Assets and Pre-Tax Income by Geographical Information
Total stream and royalty interests, net	1,941,225		1,941,225		1,846,211
Revenue	35,678	4,694	76,957	8,903
EMEA
Long Lived Assets and Pre-Tax Income by Geographical Information
Total stream and royalty interests, net	2,525,889		2,525,889		2,580,184
EMEA | Stream interest
Long Lived Assets and Pre-Tax Income by Geographical Information
Total stream and royalty interests, net	2,252,997		2,252,997		2,270,717
Revenue	80,256	20,387	159,751	42,768
EMEA | Royalty interest
Long Lived Assets and Pre-Tax Income by Geographical Information
Total stream and royalty interests, net	272,892		272,892		309,467
Revenue	5,094	0	10,373	0
Australia Pacific
Long Lived Assets and Pre-Tax Income by Geographical Information
Total stream and royalty interests, net	59,500		59,500		62,129
Australia Pacific | Stream interest
Long Lived Assets and Pre-Tax Income by Geographical Information
Total stream and royalty interests, net	11,433		11,433		13,595
Revenue	1,098	0	2,163	0
Australia Pacific | Royalty interest
Long Lived Assets and Pre-Tax Income by Geographical Information
Total stream and royalty interests, net	48,067		48,067		$ 48,534
Revenue	$ 14,164	$ 9,817	$ 29,220	$ 17,773