STREAM AND ROYALTY INTERESTS, NET - Summary (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 14, 2022	Dec. 31, 2021
Cost	$ 3,937,667		$ 3,899,867
Accumulated Depletion	(1,503,978)		(1,456,115)
Net	2,433,689		2,443,752
Production stage royalty and stream interests
Cost	3,395,213		3,369,499
Accumulated Depletion	(1,503,978)		(1,456,115)
Net	1,891,235		1,913,384
Production stage stream interests
Cost	2,446,435		2,419,936
Accumulated Depletion	(915,280)		(878,902)
Net	1,531,155		1,541,034
Production stage stream interests | Mt. Milligan
Cost	790,635		790,635
Accumulated Depletion	(352,165)		(336,921)
Net	438,470		453,714
Production stage stream interests | Pueblo Viejo
Cost	610,405		610,405
Accumulated Depletion	(267,872)		(260,321)
Net	342,533		350,084
Production stage stream interests | Andacollo
Cost	388,182		388,182
Accumulated Depletion	(143,144)		(139,035)
Net	245,038		249,147
Production stage stream interests | Khoemacau
Cost	265,911	$ 265,000	239,411
Accumulated Depletion	(4,963)		(3,402)
Net	260,948		236,009
Production stage stream interests | Rainy River
Cost	175,727		175,727
Accumulated Depletion	(53,285)		(50,115)
Net	122,442		125,612
Production stage stream interests | Wassa
Cost	146,475		146,475
Accumulated Depletion	(87,597)		(84,915)
Net	58,878		61,560
Production stage stream interests | Other Mines
Cost	69,100		69,101
Accumulated Depletion	(6,254)		(4,193)
Net	62,846		64,908
Production stage royalty interest
Cost	948,778		949,563
Accumulated Depletion	(588,698)		(577,213)
Net	360,080		372,350
Production stage royalty interest | Voiseys Bay
Cost	205,724		205,724
Accumulated Depletion	(115,738)		(113,602)
Net	89,986		92,122
Production stage royalty interest | Red Chris
Cost	116,187		116,187
Accumulated Depletion	(1,797)
Net	114,390		116,187
Production stage royalty interest | Penasquito
Cost	99,172		99,172
Accumulated Depletion	(54,243)		(53,022)
Net	44,929		46,150
Production stage royalty interest | Cortez
Cost	80,681		80,681
Accumulated Depletion	(26,693)		(23,225)
Net	53,988		57,456
Production stage royalty interest | Other Mines
Cost	447,014		447,799
Accumulated Depletion	(390,227)		(387,364)
Net	56,787		60,435
Development stage royalty and stream interest
Cost	120,256		112,213
Net	120,256		112,213
Development stage stream interest | Other Mines
Cost	12,038		12,037
Net	12,038		12,037
Development stage royalty interest | Cote
Cost	45,421		45,421
Net	45,421		45,421
Development stage royalty interest | Other Mines
Cost	62,797		54,755
Net	62,797		54,755
Exploration stage stream and royalty interests
Cost	422,198		418,155
Net	422,198		418,155
Exploration stage stream interests | NX Gold
Cost	34,213		30,974
Net	34,213		30,974
Exploration stage royalty interest | Red Chris
Cost	48,895		48,895
Net	48,895		48,895
Exploration stage royalty interest | Cote
Cost	29,610		29,610
Net	29,610		29,610
Exploration stage royalty interest | Pascua Lama
Cost	177,690		177,690
Net	177,690		177,690
Exploration stage royalty interest | Other Mines
Cost	131,790		130,986
Net	$ 131,790		$ 130,986