SEGMENT INFORMATION - Schedule of Segment Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2026 USD ($) segment	Mar. 31, 2025 USD ($)	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	$ 8,539,286		$ 8,583,875
Revenue	469,125	$ 193,436
Cost of sales	60,337	24,506
Production taxes	3,291	1,761
Depletion	90,603	32,915
Segment gross profit	314,894	134,254
Stream interest
Long Lived Assets and Pre-Tax Income by Geographical Information
Total stream and royalty interests, net	4,479,390		4,544,742
Revenue	312,777	122,482
Cost of sales	60,337	24,506
Production taxes	0	0
Depletion	53,575	20,353
Segment gross profit	198,865	77,623
Royalty interest
Long Lived Assets and Pre-Tax Income by Geographical Information
Total stream and royalty interests, net	4,059,896		4,039,133
Revenue	156,348	70,954
Cost of sales	0	0
Production taxes	3,291	1,761
Depletion	37,028	12,562
Segment gross profit	116,029	56,631
North America
Long Lived Assets and Pre-Tax Income by Geographical Information
Total stream and royalty interests, net	3,002,348		3,049,731
North America | Stream interest
Long Lived Assets and Pre-Tax Income by Geographical Information
Total stream and royalty interests, net	1,180,681		1,214,810
Revenue	163,263	81,981
North America | Royalty interest
Long Lived Assets and Pre-Tax Income by Geographical Information
Total stream and royalty interests, net	1,821,667		1,834,921
Revenue	94,733	58,790
South and Central America
Long Lived Assets and Pre-Tax Income by Geographical Information
Total stream and royalty interests, net	2,918,031		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	1,034,797		1,045,620
Revenue	68,954	18,121
South and Central America | Royalty interest
Long Lived Assets and Pre-Tax Income by Geographical Information
Total stream and royalty interests, net	1,883,234		1,846,211
Revenue	15,057	7,956
EMEA
Long Lived Assets and Pre-Tax Income by Geographical Information
Total stream and royalty interests, net	2,557,982		2,580,184
EMEA | Stream interest
Long Lived Assets and Pre-Tax Income by Geographical Information
Total stream and royalty interests, net	2,251,381		2,270,717
Revenue	79,496	22,380
EMEA | Royalty interest
Long Lived Assets and Pre-Tax Income by Geographical Information
Total stream and royalty interests, net	306,601		309,467
Revenue	5,279	0
Australia Pacific
Long Lived Assets and Pre-Tax Income by Geographical Information
Total stream and royalty interests, net	60,925		62,129
Australia Pacific | Stream interest
Long Lived Assets and Pre-Tax Income by Geographical Information
Total stream and royalty interests, net	12,531		13,595
Revenue	1,064	0
Australia Pacific | Royalty interest
Long Lived Assets and Pre-Tax Income by Geographical Information
Total stream and royalty interests, net	48,394		$ 48,534
Revenue	$ 41,279	$ 4,208