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Segment Information - Reconciliation to Adjusted EBITDA (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Segment Adjusted EBITDA excluding corporate and other segment $ 127.4 $ 227.9 $ 374.8 $ 734.1
Corporate and Other (27.9) (3.1) (38.0) (39.1)
Depreciation, depletion and amortization (100.0) (84.7) (285.5) (247.4)
Asset retirement obligation expenses (13.9) (12.9) (41.3) (38.7)
Restructuring charges (4.0) (1.9) (9.2) (2.1)
Costs related to terminated acquisition (54.0) 0.0 (75.2) 0.0
Provision for NARM loss 0.0 0.0 0.0 (3.7)
Shoal Creek insurance recovery 0.0 0.0 0.0 28.7
Changes in amortization of basis difference related to equity affiliates 0.5 0.4 1.9 1.1
Interest expense, net of capitalized interest (10.0) (9.7) (32.6) (35.1)
Interest income 13.9 17.7 43.1 53.7
Unrealized (losses) gains on foreign currency option contracts (2.3) 3.7 6.1 0.4
Take-or-pay contract-based intangible recognition 0.3 0.8 0.8 2.3
(Loss) income from continuing operations before income taxes $ (70.0) $ 138.2 $ (55.1) $ 454.2