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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Statement [Abstract]      
Revenue from physical sale of coal $ 4,236.7 $ 4,946.7 $ 4,981.9
Costs and expenses      
Operating costs and expenses (exclusive of items shown separately below) 3,420.9 3,385.1 3,290.8
Depreciation, depletion and amortization 343.0 321.4 317.6
Asset retirement obligation expenses 48.9 50.5 49.4
Selling and administrative expenses 91.0 90.7 88.8
Restructuring charges 4.4 3.3 2.9
Transaction costs related to business combinations 10.3 0.0 0.0
Other operating (income) loss:      
Net gain on disposals (9.8) (15.0) (29.2)
Asset impairment 0.0 2.0 11.2
Provision for NARM and Shoal Creek losses 3.7 40.9 0.0
Shoal Creek insurance recovery (109.5) 0.0 0.0
Income from equity affiliates (11.5) (6.9) (131.2)
Operating profit 445.3 1,074.7 1,381.6
Interest expense, net of capitalized interest 46.9 59.8 140.3
Net loss on early debt extinguishment 0.0 8.8 57.9
Interest income (71.0) (76.8) (18.4)
Net periodic benefit credit, excluding service cost (40.6) (41.6) (49.0)
Net mark-to-market adjustment on actuarially determined liabilities (6.1) (0.3) (27.8)
Income from continuing operations before income taxes 516.1 1,124.8 1,278.6
Income tax provision (benefit) 108.8 308.8 (38.8)
Income from continuing operations, net of income taxes 407.3 816.0 1,317.4
(Loss) income from discontinued operations, net of income taxes (3.8) (0.4) 1.7
Net income 403.5 815.6 1,319.1
Less: Net income attributable to noncontrolling interests 32.6 56.0 22.0
Net income attributable to common stockholders $ 370.9 $ 759.6 $ 1,297.1
Income from continuing operations:      
Basic income per share $ 2.99 $ 5.52 $ 9.12
Diluted income per share 2.73 5.00 8.29
Net income attributable to common stockholders:      
Basic income per share 2.96 5.52 9.13
Diluted income per share $ 2.70 $ 5.00 $ 8.31