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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Income Statement [Abstract]        
Revenues $ 1,088.0 $ 1,078.9 $ 3,113.6 $ 3,711.7
Costs and expenses        
Operating costs and expenses (exclusive of items shown separately below) 845.8 803.7 2,463.9 2,512.3
Depreciation, depletion and amortization 84.7 82.3 247.4 239.2
Asset retirement obligation expenses 12.9 15.4 38.7 46.3
Selling and administrative expenses 20.6 21.5 64.7 66.0
Restructuring charges 1.9 0.9 2.1 3.0
Other operating (income) loss:        
Net gain on disposals (0.1) (1.4) (9.7) (8.5)
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
Shoal Creek insurance recovery 0.0 0.0 (109.5) 0.0
Loss (income) from equity affiliates 2.1 (5.6) 7.1 (9.7)
Operating profit 120.1 158.8 405.2 824.1
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)
Net periodic benefit credit, excluding service cost (10.1) (10.0) (30.4) (29.4)
Income from continuing operations before income taxes 138.2 175.3 454.2 855.7
Income tax provision 25.7 46.5 85.2 238.7
Income from continuing operations, net of income taxes 112.5 128.8 369.0 617.0
(Loss) income from discontinued operations, net of income taxes (1.0) 2.5 (3.3) (0.1)
Net income 111.5 131.3 365.7 616.9
Less: Net income attributable to noncontrolling interests 10.2 11.4 25.4 49.3
Net income attributable to common stockholders $ 101.3 $ 119.9 $ 340.3 $ 567.6
Income from continuing operations:        
Basic income per share $ 0.82 $ 0.88 $ 2.72 $ 4.06
Diluted income per share 0.74 0.80 2.47 3.68
Net income attributable to common stockholders:        
Basic income per share 0.81 0.90 2.69 4.05
Diluted income per share $ 0.74 $ 0.82 $ 2.44 $ 3.68