ASSET RETIREMENT AND ENVIRONMENTAL OBLIGATIONS (Details) - USD ($) $ in Millions |
9 Months Ended | |
|---|---|---|
Sep. 30, 2026 |
Dec. 31, 2025 |
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| Unusual Risk or Uncertainty [Line Items] | ||
| Asset retirement obligations, noncurrent | $ 8.1 | $ 7.7 |
| Estimated undiscounted cash flows, to satisfy obligation | $ 51.3 | 51.4 |
| Remediation term | 30 years | |
| Discount rate | 4.84% | |
| Environmental obligations, undiscounted cost | $ 39.6 | 40.3 |
| Accrued environmental loss contingencies, noncurrent | 18.4 | 18.4 |
| Closure and reclamation obligations, financial assurances | $ 46.9 | $ 46.2 |
| Minimum | ||
| Unusual Risk or Uncertainty [Line Items] | ||
| Asset retirement obligations, credit-adjusted risk free rate | 6.50% | |
| Maximum | ||
| Unusual Risk or Uncertainty [Line Items] | ||
| Asset retirement obligations, credit-adjusted risk free rate | 8.80% |
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- Definition Accrual for Environmental Loss Contingencies, Remediation Term No definition available.
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- Definition Asset Retirement Obligation, Closure And Reclamation Obligations, Financial Assurances No definition available.
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- Definition Asset Retirement Obligations, Credit-Adjusted Risk Free Rate No definition available.
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- Definition Asset Retirement Obligations, Estimated Undiscounted Cash Flows To Satisfy Obligation No definition available.
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- Definition Rate applied to the undiscounted amount of environmental loss contingencies to arrive at the present value recorded as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Undiscounted amount of the accrual for environmental loss contingencies. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable after twelve months or beyond the next operating cycle if longer. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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