REVENUE - Property Disaggregation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue
Revenue	$ 1,030,471	$ 719,395	$ 605,717
Stream interest
Disaggregation of Revenue
Revenue	686,472	483,294	418,280
Stream interest | Mt. Milligan
Disaggregation of Revenue
Revenue	223,713	186,039	158,167
Stream interest | Pueblo Viejo
Disaggregation of Revenue
Revenue	129,830	83,059	76,247
Stream interest | Andacollo
Disaggregation of Revenue
Revenue	77,896	47,531	48,920
Stream interest | Kansanshi
Disaggregation of Revenue
Revenue	32,279	0	0
Stream interest | Other
Disaggregation of Revenue
Revenue	222,754	166,665	134,946
Royalty interest
Disaggregation of Revenue
Revenue	343,999	236,101	187,437
Royalty interest | Cortez Legacy Zone
Disaggregation of Revenue
Revenue	31,823	58,183	79,920
Royalty interest | Cortez CC Zone
Disaggregation of Revenue
Revenue	35,715	11,611	14,626
Royalty interest | Other
Disaggregation of Revenue
Revenue	$ 276,461	$ 166,307	$ 92,891