Segment Information - Reconciliation to Adjusted EBITDA (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
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| Segment Reporting [Line Items] | ||
| Segment Adjusted EBITDA excluding corporate and other segment | $ 103.0 | $ 166.6 |
| Corporate and Other | (20.5) | (22.6) |
| Depreciation, depletion and amortization | (109.5) | (92.1) |
| Asset retirement obligation expenses | (13.6) | (13.6) |
| Restructuring charges | (1.1) | (1.7) |
| Costs related to terminated acquisition | (3.0) | (2.4) |
| Changes in amortization of basis difference related to equity affiliates | 0.6 | 0.6 |
| Interest expense, net of capitalized interest | (10.7) | (11.5) |
| Interest income | 13.1 | 15.4 |
| Unrealized gains on foreign currency option contracts | 0.3 | 4.3 |
| Take-or-pay contract-based intangible recognition | 0.0 | 0.2 |
| (Loss) income from continuing operations before income taxes | $ (41.4) | $ 43.2 |
| X | ||||||||||
- Definition Corporate and Other No definition available.
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- Definition Fresh Start Adjustment, Fair Value Adjustment No definition available.
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- Definition Segment Reporting Information Adjusted EBITDA excluding corporate and other segment No definition available.
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| X | ||||||||||
- Definition Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of expense for acquisition-related cost incurred to effect business combination. Includes, but is not limited to, finder's fee; advisory, legal, accounting, valuation, and other professional and consulting fees; and general administrative cost, including cost of maintaining internal acquisition department. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The difference between the book value and the sale price of agreements to purchase or sell mineral resources, energy, and agricultural products at some future point. This element refers to the gain (loss) included in earnings and not to the cash proceeds. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of interest expense classified as operating and nonoperating. Includes, but is not limited to, cost of borrowing accounted for as interest expense. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- 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/2003/role/disclosureRef
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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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