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COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Çöpler Incident
Loss Contingencies [Line Items]
Contingencies related to the Çöpler incident		$ 15.3
Gain on revision of estimate	$ 7.9
Surety Bond
Loss Contingencies [Line Items]
Environmental bonding obligation, outstanding	$ 156.0		$ 142.7

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Environmental Bonding Obligation, Outstanding

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Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges.

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