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Segment Information - Reconciliation to Adjusted EBITDA (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting Information [Line Items]        
(Loss) income from continuing operations before income taxes $ (28.3) $ 250.2 $ 14.9 $ 316.0
Depreciation, depletion and amortization 93.4 82.9 185.5 162.7
Asset retirement obligation expenses 13.8 12.9 27.4 25.8
Restructuring charges 3.5 0.1 5.2 0.2
Transaction costs related to business combinations 18.8 0.0 21.2 0.0
Provision for NARM loss 0.0 1.9 0.0 3.7
Shoal Creek insurance recovery 0.0 (28.7) 0.0 (28.7)
Changes in amortization of basis difference related to equity affiliates (0.8) (0.3) (1.4) (0.7)
Interest expense, net of capitalized interest 11.1 10.7 22.6 25.4
Interest income (13.8) (16.8) (29.2) (36.0)
Unrealized (gains) losses on foreign currency option contracts (4.1) (2.4) (8.4) 3.3
Take-or-pay contract-based intangible recognition (0.3) (0.8) (0.5) (1.5)
Total Adjusted EBITDA $ 93.3 $ 309.7 $ 237.3 $ 470.2