REVENUE - Property Disaggregation (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue
Revenue	$ 342,952	$ 603,206	$ 653,568	$ 615,856	$ 498,819
Stream interests
Disaggregation of Revenue
Revenue	226,551	417,793		423,989	359,868
Stream interests | Mt. Milligan
Disaggregation of Revenue
Revenue	95,509	180,543		156,938	131,425
Stream interests | Pueblo Viejo
Disaggregation of Revenue
Revenue	52,958	85,863		115,583	96,978
Stream interests | Andacollo
Disaggregation of Revenue
Revenue	28,076	47,347		82,164	74,219
Stream interests | Khoemacau
Disaggregation of Revenue
Revenue	5,096	18,786
Stream interests | Other.
Disaggregation of Revenue
Revenue	44,912	85,254		69,304	57,246
Royalty interests
Disaggregation of Revenue
Revenue	116,401	185,413		191,867	138,951
Royalty interests | Cortez Legacy Zone
Disaggregation of Revenue
Revenue	33,768	47,769		36,160	22,342
Royalty interests | Cortez CC Zone
Disaggregation of Revenue
Revenue		2,790
Royalty interests | Penasquito
Disaggregation of Revenue
Revenue	26,432	43,165		49,688	25,498
Royalty interests | Other.
Disaggregation of Revenue
Revenue	$ 56,201	$ 91,689		$ 106,019	$ 91,111