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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2024
Sep. 30, 2023
Cash Flows From Operating Activities      
Net income $ 111.5 $ 365.7 $ 616.9
Loss from discontinued operations, net of income taxes 1.0 3.3 0.1
Income from continuing operations, net of income taxes 112.5 369.0 617.0
Adjustments to reconcile income from continuing operations, net of income taxes to net cash provided by operating activities:      
Depreciation, depletion and amortization 84.7 247.4 239.2
Noncash interest expense, net 0.8 4.0 4.0
Deferred income taxes   (10.9) 71.8
Noncash share-based compensation   5.7 5.1
Asset impairment 0.0 0.0 2.0
Noncash provision for NARM and Shoal Creek losses   0.0 33.7
Net gain on disposals (0.1) (9.7) (8.5)
Noncash income from port and rail capacity assignment   (0.3) (9.4)
Net loss on early debt extinguishment 0.0 0.0 8.8
Loss (income) from equity affiliates 2.1 7.1 (9.7)
Foreign currency option contracts   (0.4) (0.1)
Changes in current assets and liabilities:      
Accounts receivable   82.0 126.6
Inventories   (92.6) (59.9)
Other current assets   15.6 30.1
Accounts payable and accrued expenses   (198.3) (29.2)
Collateral arrangements   143.3 (145.9)
Asset retirement obligations   (1.2) 3.9
Workers’ compensation obligations   (2.0) (1.3)
Postretirement benefit obligations   (45.0) (46.3)
Pension obligations   0.0 0.9
Other, net   (5.7) (0.1)
Net cash provided by continuing operations   491.4 832.7
Net cash used in discontinued operations   (4.7) (79.6)
Net cash provided by operating activities   486.7 753.1
Cash Flows From Investing Activities      
Additions to property, plant, equipment and mine development   (265.7) (190.4)
Changes in accrued expenses related to capital expenditures   (6.5) (5.1)
Proceeds from Insurance Settlement, Investing Activities   10.9 0.0
Proceeds from disposal of assets, net of receivables   16.1 13.9
Contributions to joint ventures   (550.1) (573.4)
Distributions from joint ventures   549.8 579.4
Other, net   (0.3) 1.0
Net cash used in investing activities   (389.6) (174.6)
Cash Flows From Financing Activities      
Repayments of long-term debt   (7.2) (6.9)
Payment of debt issuance and other deferred financing costs   (11.1) (0.3)
Common stock repurchases   (183.1) (264.0)
Repurchase of employee common stock relinquished for tax withholding   (4.1) (13.7)
Dividends paid   (28.5) (20.7)
Distributions to noncontrolling interests   (34.8) (58.9)
Net cash used in financing activities   (268.8) (364.5)
Net change in cash, cash equivalents and restricted cash   (171.7) 214.0
Cash, cash equivalents and restricted cash at beginning of period (1)   1,650.2 1,417.6
Cash, cash equivalents and restricted cash at end of period (2) 1,478.5 1,478.5 1,631.6
Cash and cash equivalents 772.9 772.9  
Restricted Cash $ 705.6 705.6  
Asset Acquisition, Consideration Transferred   (143.8) 0.0
Unpaid Insurance Recoveries and Proceeds From Equipment Losses   $ 16.6 $ 0.0