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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Income Statement [Abstract]        
Revenues $ 1,042.0 $ 1,268.8 $ 2,025.6 $ 2,632.8
Costs and expenses        
Operating costs and expenses (exclusive of items shown separately below) 803.9 862.0 1,618.1 1,708.6
Depreciation, depletion and amortization 82.9 80.6 162.7 156.9
Asset retirement obligation expenses 12.9 15.5 25.8 30.9
Selling and administrative expenses 22.1 21.7 44.1 44.5
Restructuring charges 0.1 2.0 0.2 2.1
Other operating (income) loss:        
Net gain on disposals (7.5) (5.2) (9.6) (7.1)
Asset impairment 0.0 0.0 0.0 2.0
Provision for NARM and Shoal Creek losses 1.9 33.7 3.7 33.7
Shoal Creek insurance recovery (109.5) 0.0 (109.5) 0.0
Loss (income) from equity affiliates 1.3 (2.3) 5.0 (4.1)
Operating profit 233.9 260.8 285.1 665.3
Interest expense, net of capitalized interest 10.7 13.3 25.4 31.7
Net loss on early debt extinguishment 0.0 2.0 0.0 8.8
Interest income (16.8) (23.1) (36.0) (36.2)
Net periodic benefit credit, excluding service cost (10.2) (9.7) (20.3) (19.4)
Income from continuing operations before income taxes 250.2 278.3 316.0 680.4
Income tax provision 39.4 74.2 59.5 192.2
Income from continuing operations, net of income taxes 210.8 204.1 256.5 488.2
Loss from discontinued operations, net of income taxes (1.6) (1.3) (2.3) (2.6)
Net income 209.2 202.8 254.2 485.6
Less: Net income attributable to noncontrolling interests 9.8 23.6 15.2 37.9
Net income attributable to common stockholders $ 199.4 $ 179.2 $ 239.0 $ 447.7
Income from continuing operations:        
Basic income per share $ 1.59 $ 1.27 $ 1.90 $ 3.14
Diluted income per share 1.43 1.16 1.72 2.85
Net income attributable to common stockholders:        
Basic income per share 1.58 1.26 1.88 3.12
Diluted income per share $ 1.42 $ 1.15 $ 1.70 $ 2.83