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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 12 Months Ended 45 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Cash Flows From Operating Activities        
Net income $ 815,600,000 $ 1,319,100,000 $ 371,400,000  
Loss (income) from discontinued operations, net of income taxes 400,000 (1,700,000) (24,000,000.0)  
Income from continuing operations, net of income taxes 816,000,000.0 1,317,400,000 347,400,000  
Adjustments to reconcile income from continuing operations, net of income taxes to net cash provided by operating activities:        
Depreciation, depletion and amortization 321,400,000 317,600,000 308,700,000  
Noncash interest expense, net 4,600,000 17,700,000 21,300,000  
Deferred income taxes 82,900,000 (81,600,000) (7,500,000)  
Noncash share-based compensation 6,900,000 8,400,000 10,000,000.0  
Noncash provision for NARM and Shoal Creek losses 33,700,000 0 0  
Asset impairment 2,000,000.0 11,200,000 0  
Net gain on disposals (15,000,000.0) (29,200,000) (31,500,000)  
Noncash income from port and rail capacity assignment (9,600,000) 0 0  
Net loss (gain) on early debt extinguishment 8,800,000 57,900,000 (33,200,000)  
Income from equity affiliates (6,900,000) (131,200,000) (82,100,000)  
Foreign currency option contracts (7,400,000) 2,300,000 5,800,000  
Changes in current assets and liabilities:        
Accounts receivable 88,400,000 (115,000,000.0) (105,600,000)  
Inventories (59,700,000) (69,400,000) 35,000,000.0  
Other current assets 900,000 (29,300,000) (57,600,000)  
Accounts payable and accrued expenses 120,200,000 68,000,000.0 128,100,000  
Collateral arrangements (199,600,000) (53,300,000) (6,300,000)  
Asset retirement obligations (10,300,000) (22,300,000) 6,800,000  
Workers’ compensation obligations 1,200,000 (900,000) (2,000,000.0)  
Postretirement benefit obligations (61,900,000) (109,300,000) (108,200,000)  
Pension obligations (1,300,000) 18,600,000 11,600,000  
Other, net 1,000,000.0 2,700,000 0  
Net cash provided by continuing operations 1,116,300,000 1,180,300,000 440,700,000  
Net cash used in discontinued operations (80,800,000) (6,700,000) (20,700,000)  
Net cash provided by operating activities 1,035,500,000 1,173,600,000 420,000,000.0  
Cash Flows From Investing Activities        
Additions to property, plant, equipment and mine development (348,300,000) (221,500,000) (183,100,000)  
Changes in accrued expenses related to capital expenditures 2,900,000 (2,700,000) 7,400,000  
Proceeds from disposal of assets, net of receivables 22,800,000 40,600,000 17,800,000  
Contributions to joint ventures (741,600,000) (645,900,000) (485,600,000)  
Distributions from joint ventures 721,700,000 631,600,000 470,800,000  
Advances to related parties (500,000) (1,500,000) (500,000)  
Cash receipts from Middlemount Coal Pty Ltd and other related parties 2,600,000 171,800,000 44,700,000  
Other, net (2,200,000) (1,100,000) (3,000,000.0)  
Net cash used in investing activities (342,600,000) (28,700,000) (131,500,000)  
Cash Flows From Financing Activities        
Proceeds from long-term debt 0 545,000,000.0 0  
Repayments of long-term debt (9,000,000.0) (1,407,400,000) (285,300,000)  
Payment of debt issuance and other deferred financing costs (300,000) (21,100,000) (22,500,000)  
Proceeds from common stock issuances, net of costs 0 222,000,000.0 269,800,000  
Common stock repurchases (347,700,000) 0 0 $ (1,340,300,000)
Repurchase of employee common stock relinquished for tax withholding (13,700,000) (2,600,000) (1,400,000)  
Dividends paid (30,600,000) 0 0  
Distributions to noncontrolling interests (59,000,000.0) (17,500,000) (4,000,000.0)  
Net cash used in financing activities (460,300,000) (681,600,000) (43,400,000)  
Net change in cash, cash equivalents and restricted cash 232,600,000 463,300,000 245,100,000  
Cash and cash equivalents 969,300,000 1,307,300,000    
Restricted cash included in “Restricted cash and collateral” 680,900,000 110,300,000    
Cash, cash equivalents and restricted cash at beginning of period (1) 1,417,600,000 954,300,000 709,200,000  
Cash, cash equivalents and restricted cash at end of period (2) $ 1,650,200,000 $ 1,417,600,000 $ 954,300,000 $ 709,200,000