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Segment Information - Reconciliation to Adjusted EBITDA (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting Information [Line Items]        
Income from continuing operations, net of income taxes $ 112.5 $ 128.8 $ 369.0 $ 617.0
Depreciation, depletion and amortization 84.7 82.3 247.4 239.2
Asset retirement obligation expenses 12.9 15.4 38.7 46.3
Restructuring charges 1.9 0.9 2.1 3.0
Asset impairment 0.0 0.0 0.0 2.0
Provision for NARM and Shoal Creek losses 0.0 3.3 3.7 37.0
Gain on Business Interruption Insurance Recovery 0.0 0.0 28.7 0.0
Changes in amortization of basis difference related to equity affiliates (0.4) (0.5) (1.1) (1.2)
Interest expense, net of capitalized interest 9.7 13.8 35.1 45.5
Net loss on early debt extinguishment 0.0 0.0 0.0 8.8
Interest income (17.7) (20.3) (53.7) (56.5)
Unrealized gains on derivative contracts related to forecasted sales 0.0 0.0 0.0 (159.0)
Unrealized (gains) losses on foreign currency option contracts (3.7) 0.5 (0.4) (0.1)
Take-or-pay contract-based intangible recognition (0.8) (0.7) (2.3) (1.9)
Income tax provision 25.7 46.5 85.2 238.7
Adjusted EBITDA $ 224.8 $ 270.0 $ 695.0 $ 1,018.8