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COMMITMENTS AND CONTINGENCIES - Prepayment agreement (Details) - Auramet International LLC ("Auramet") - Prepayment Agreement - Guarantee Obligation - Precious metal $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026 USD ($) oz	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($) oz	Jun. 30, 2025 USD ($)
Other Commitments
Net proceeds from sales on a Supplier Advance Basis	$ 32.3	$ 13.5	$ 66.7	$ 38.2
Revenue from sales on a Supplier Advance Basis	24.3	8.4	58.7	38.2
Remaining net proceeds recorded as deferred revenue	$ 8.1	$ 0.0	$ 8.1	$ 0.0
Number of ounces of gold pledged but not delivered | oz	2,000		2,000

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(20))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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