REVENUE - Property Disaggregation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue
Total revenue	$ 193,837	$ 138,617	$ 516,835	$ 453,051
Stream interest
Disaggregation of Revenue
Total revenue	133,052	98,978	358,531	319,982
Stream interest | Mount Milligan
Disaggregation of Revenue
Total revenue	56,570	33,876	143,704	121,739
Stream interest | Pueblo Viejo
Disaggregation of Revenue
Total revenue	26,585	16,688	64,147	62,586
Stream interest | Andacollo
Disaggregation of Revenue
Total revenue	9,652	14,644	31,949	35,401
Stream interest | Khoemacau
Disaggregation of Revenue
Total revenue	7,996	9,047	24,148	27,082
Stream interest | Other
Disaggregation of Revenue
Total revenue	32,249	24,723	94,583	73,174
Royalty revenue:
Disaggregation of Revenue
Total revenue	60,785	39,639	158,304	133,069
Royalty revenue: | Other
Disaggregation of Revenue
Total revenue	35,643	17,023	79,118	52,795
Royalty revenue: | Cortez Legacy Zone
Disaggregation of Revenue
Total revenue	13,047	19,668	41,610	57,062
Royalty revenue: | Cortez CC Zone
Disaggregation of Revenue
Total revenue	2,739	2,948	7,713	9,674
Royalty revenue: | Peñasquito
Disaggregation of Revenue
Total revenue	$ 9,356	$ 0	$ 29,863	$ 13,538