REVENUE - Property Disaggregation (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue
Revenue	$ 342,952	$ 605,717	$ 603,206	$ 615,856
Stream interests
Disaggregation of Revenue
Revenue	226,551	418,280	417,793	423,989	$ 423,989
Stream interests | Mt. Milligan
Disaggregation of Revenue
Revenue	95,509	158,167	180,543	156,938
Stream interests | Pueblo Viejo
Disaggregation of Revenue
Revenue	52,958	76,247	85,863	115,583
Stream interests | Andacollo
Disaggregation of Revenue
Revenue	28,076	48,920	47,347	82,164
Stream interests | Khoemacau
Disaggregation of Revenue
Revenue	5,096	34,602	18,786
Stream interests | Other interest
Disaggregation of Revenue
Revenue	44,912	100,344	85,254	69,304
Royalty interests
Disaggregation of Revenue
Revenue	116,401	187,437	185,413	191,867
Royalty interests | Cortez Legacy Zone
Disaggregation of Revenue
Revenue	33,768	79,920	47,769	36,160
Royalty interests | Cortez CC Zone
Disaggregation of Revenue
Revenue		14,626	2,790
Royalty interests | Penasquito
Disaggregation of Revenue
Revenue	26,432	17,772	43,165	49,688
Royalty interests | Other interest
Disaggregation of Revenue
Revenue	$ 56,201	$ 75,119	$ 91,689	$ 106,019