REVENUE - Schedule of Property Disaggregation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of Revenue
Total revenue	$ 450,539	$ 209,643	$ 919,664	$ 403,080
Stream interest
Disaggregation of Revenue
Total revenue	310,964	133,191	623,741	255,673
Stream interest | Mount Milligan
Disaggregation of Revenue
Total revenue	57,576	63,655	114,898	106,463
Stream interest | Pueblo Viejo
Disaggregation of Revenue
Total revenue	44,904	25,619	100,773	54,369
Stream interest | Andacollo
Disaggregation of Revenue
Total revenue	49,107	9,489	76,258	22,234
Stream interest | Kansanshi
Disaggregation of Revenue
Total revenue	34,303	0	59,814	0
Stream interest | Other
Disaggregation of Revenue
Total revenue	125,074	34,428	271,998	72,607
Royalty revenue
Disaggregation of Revenue
Total revenue	139,575	76,452	295,923	147,407
Royalty revenue | Cortez Legacy Zone
Disaggregation of Revenue
Total revenue	16,312	8,508	32,738	19,650
Royalty revenue | Cortez CC Zone
Disaggregation of Revenue
Total revenue	9,651	8,088	18,444	11,642
Royalty revenue | Other
Disaggregation of Revenue
Total revenue	$ 113,612	$ 59,856	$ 244,741	$ 116,115