REVENUE - Schedule of Property Disaggregation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue
Total revenue	$ 469,125	$ 193,436
Stream interest
Disaggregation of Revenue
Total revenue	312,777	122,482
Stream interest | Mount Milligan
Disaggregation of Revenue
Total revenue	57,322	42,808
Stream interest | Pueblo Viejo
Disaggregation of Revenue
Total revenue	55,869	28,751
Stream interest | Andacollo
Disaggregation of Revenue
Total revenue	27,151	12,744
Stream interest | Kansanshi
Disaggregation of Revenue
Total revenue	25,511	0
Stream interest | Other
Disaggregation of Revenue
Total revenue	146,924	38,179
Royalty revenue:
Disaggregation of Revenue
Total revenue	156,348	70,954
Royalty revenue: | Other
Disaggregation of Revenue
Total revenue	131,129	56,257
Royalty revenue: | Cortez Legacy Zone
Disaggregation of Revenue
Total revenue	16,426	11,143
Royalty revenue: | Cortez CC Zone
Disaggregation of Revenue
Total revenue	$ 8,793	$ 3,554