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Segment and Geographic Information - Reconciliation of Consolidated Income (Loss), Net of Income Taxes to Adjusted EBITDA (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Segment Reporting Information Adjusted EBITDA excluding corporate and other segment $ 525.8 $ 961.9 $ 1,376.1
Corporate and Other (70.9) (90.2) (12.2)
Depreciation, depletion and amortization (384.5) (343.0) (321.4)
Asset retirement obligation expenses (36.5) (48.9) (50.5)
Restructuring charges (9.5) (4.4) (3.3)
Costs related to terminated acquisition (78.9) (10.3) 0.0
Shoal Creek insurance recovery - property damage 0.0 28.7 0.0
Changes in amortization of basis difference related to equity affiliates 2.7 1.8 1.6
Other Cost and Expense, Operating (5.6) (3.7) (42.9)
Interest expense, net of capitalized interest (43.9) (46.9) (59.8)
Net loss on early debt extinguishment 0.0 0.0 (8.8)
Investment Income, Interest 55.4 71.0 76.8
Net mark-to-market adjustment on actuarially determined liabilities 5.4 6.1 0.3
Unrealized gains on derivative contracts related to forecasted sales 0.0 0.0 159.0
Unrealized gains (losses) on foreign currency option contracts 6.0 (9.0) 7.4
Take-or-pay contract-based intangible recognition 1.0 3.0 2.5
(Loss) income from continuing operations before income taxes $ (33.5) $ 516.1 $ 1,124.8