v3.26.3
Segment Information - Reconciliation to Adjusted EBITDA (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Segment Reporting [Line Items]        
Segment Adjusted EBITDA excluding corporate and other segment $ 111.2 $ 127.4 $ 269.1 $ 374.8
Corporate and Other (13.7) (27.9) (65.1) (38.0)
Depreciation, depletion and amortization (97.6) (100.0) (314.6) (285.5)
Asset retirement obligation expenses (13.7) (13.9) (41.1) (41.3)
Restructuring charges (1.0) (4.0) (4.4) (9.2)
Costs related to terminated acquisition (3.9) (54.0) (9.2) (75.2)
Changes in amortization of basis difference related to equity affiliates 0.5 0.5 1.8 1.9
Interest expense, net of capitalized interest (18.6) (10.0) (42.0) (32.6)
Induced Conversion of Convertible Debt Expense (3.3) 0.0 (20.5) 0.0
Interest income 8.5 13.9 33.7 43.1
Unrealized gains (losses) on foreign currency option contracts 0.8 (2.3) (2.8) 6.1
Take-or-pay contract-based intangible recognition 0.0 0.3 0.0 0.8
Loss from continuing operations before income taxes (33.2) (70.0) (197.5) (55.1)
Fair Value, Option, Changes in Fair Value, Gain (Loss) 7.2 0.0 7.2 0.0
Other Cost and Expense, Operating $ (12.9) $ 0.0 $ (12.9) $ 0.0