STREAM AND ROYALTY ACQUISITIONS (Details) $ in Millions							3 Months Ended	12 Months Ended
	Dec. 31, 2025 oz	Sep. 30, 2025 USD ($)	Aug. 05, 2025 USD ($) oz	May 21, 2025 kilometer oz	May 16, 2025 USD ($)	Mar. 28, 2025 USD ($) oz	Mar. 31, 2026 USD ($)	Dec. 31, 2025 USD ($) oz
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]
Cash consideration paid | $			$ 1,000.0
Kansanshi Gold Stream Acquisition | Production Threshold One
Asset Acquisition [Line Items]
Asset acquisition, ounces of gold produced per million pounds of recovered copper | oz			75
Asset acquisition, gold delivered, weight (ounces) | oz			425,000
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]
Cash consideration paid | $							$ 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]
Cash consideration paid | $					$ 12.5
Net smelter return (NSR) percentage					2.00%
Additional Xavantina Stream
Asset Acquisition [Line Items]
Cash consideration paid | $		$ 50.0				$ 50.0
Asset acquisition, gold delivery, threshold, ounces | oz	160,000					93,000		160,000
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	54,900							54,900
Asset acquisition, cash purchase price, percentage of spot price, gold	20.00%							20.00%
Asset acquisition, gold delivery, threshold, ounces | oz	49,000							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