STREAM AND ROYALTY ACQUISITIONS (Details) $ in Millions						3 Months Ended
	Sep. 30, 2025 USD ($) oz	Aug. 05, 2025 USD ($) oz	May 21, 2025 USD ($) kilometer oz	May 16, 2025 USD ($)	Mar. 28, 2025 USD ($) oz	Dec. 31, 2025 USD ($)
Revolving Credit Facility | Credit Facility | Line of Credit
Asset Acquisition [Line Items]
Proceeds from lines of credit | $		$ 825.0
Kansanshi Gold Stream Acquisition
Asset Acquisition [Line Items]
Asset acquisition, consideration transferred | $		$ 1,000.0
Kansanshi Gold Stream Acquisition | Production Threshold One
Asset Acquisition [Line Items]
Asset acquisition, gold delivered, weight (ounces) | oz		425,000
Asset acquisition, ounces of gold produced per million pounds of recovered copper | oz		75
Kansanshi Gold Stream Acquisition | Production Threshold Two
Asset Acquisition [Line Items]
Asset acquisition, ounces of gold produced per million pounds of recovered copper | oz		55
Kansanshi Gold Stream Acquisition | Production Threshold Two | Minimum
Asset Acquisition [Line Items]
Asset acquisition, gold delivered, weight (ounces) | oz		425,001
Kansanshi Gold Stream Acquisition | Production Threshold Two | Maximum
Asset Acquisition [Line Items]
Asset acquisition, gold delivered, weight (ounces) | oz		650,000
Kansanshi Gold Stream Acquisition | Production Threshold Three
Asset Acquisition [Line Items]
Asset acquisition, ounces of gold produced per million pounds of recovered copper | oz		45
Kansanshi Gold Stream Acquisition | Acceleration Option 1
Asset Acquisition [Line Items]
Adjusted ratio of debt to earnings before interest, taxes, depreciation and amortization		2.25
Asset acquisition, gold option, exercisable period (in years)		1 year
Asset acquisition, gold deliverable, value | $		$ 200.0
Asset acquisition, gold deliverable, threshold period (in months)		14 months
Asset acquisition, reduction in stream rate and delivery thresholds, percentage		20.00%
Asset acquisition, cash purchase price, percentage of spot price, gold		20.00%
Kansanshi Gold Stream Acquisition | Acceleration Option 2
Asset Acquisition [Line Items]
Adjusted ratio of debt to earnings before interest, taxes, depreciation and amortization		1.25
Asset acquisition, gold option, exercisable period (in years)		1 year
Asset acquisition, gold deliverable, value | $		$ 100.0
Asset acquisition, gold deliverable, threshold period (in months)		7 months
Asset acquisition, reduction in stream rate and delivery thresholds, percentage		10.00%
Asset acquisition, cash purchase price, percentage of spot price, gold		35.00%
Warintza Project Stream and Royalty
Asset Acquisition [Line Items]
Conditional funding from acquisition | $			$ 100.0
Warintza Project Stream and Royalty | Forecast
Asset Acquisition [Line Items]
Asset acquisition, consideration transferred | $						$ 200.0
Asset acquisition, cash paid for royalty and streaming agreements | $						100.0
Warintza Project Stream and Royalty | Environmental Impact Milestone | Forecast
Asset Acquisition [Line Items]
Conditional funding from acquisition | $						50.0
Warintza Project Stream and Royalty | Security Milestone | Forecast
Asset Acquisition [Line Items]
Conditional funding from acquisition | $						$ 50.0
Gold Stream Agreement
Asset Acquisition [Line Items]
Asset acquisition, ounces of gold produced per million pounds of recovered copper | oz			20
Asset acquisition, cash purchase price, percentage of spot price, gold			20.00%
Asset acquisition, gold delivery, threshold, ounces | oz			90,000
Asset acquisition, spot price, gold, percentage			60.00%
Gold Stream Agreement | Minimum
Asset Acquisition [Line Items]
Area of interest | kilometer			31
Gold Stream Agreement | Maximum
Asset Acquisition [Line Items]
Area of interest | kilometer			186
Gold Stream Royalty Agreement
Asset Acquisition [Line Items]
Area of interest | kilometer			186
Net smelter return (NSR) percentage			0.30%
Asset acquisition, annually increased NSR rate			0.0375%
Asset acquisition, maximum of NSR rate			0.60%
Asset acquisition, early termination, NSR rate			0.0060
Asset acquisition, area of interest, reduction | kilometer			31
Lawyers Ranch Project Royalty
Asset Acquisition [Line Items]
Asset acquisition, consideration transferred | $				$ 12.5
Net smelter return (NSR) percentage				2.00%
Additional Xavantina Stream
Asset Acquisition [Line Items]
Asset acquisition, consideration transferred | $	$ 50.0				$ 50.0
Asset acquisition, gold delivery, threshold, ounces | oz	160,000				93,000
Asset acquisition, spot price, gold, percentage	40.00%
Asset acquisition, stream rate, percentage	25.00%
Xavantina Base Stream And Additional Stream
Asset Acquisition [Line Items]
Asset acquisition, gold delivered, weight (ounces) | oz	50,400
Asset acquisition, cash purchase price, percentage of spot price, gold	20.00%
Asset acquisition, gold delivery, threshold, ounces | oz	49,000
Asset acquisition, spot price, gold, percentage	40.00%
Kansanshi | Subsidiary Of First Quantum Minerals Ltd
Asset Acquisition [Line Items]
Ownership interest held by parent, percentage		0.80