UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)
Cash Flows From Operating Activities
Net income	$ 616.9	$ 673.6
Loss from discontinued operations, net of income taxes	0.1	2.3
Income from continuing operations, net of income taxes	617.0	675.9
Adjustments to reconcile income from continuing operations, net of income taxes to net cash provided by operating activities:
Depreciation, depletion and amortization	239.2	227.4
Noncash interest expense, net	4.0	13.6
Deferred income taxes	71.8	(2.8)
Noncash share-based compensation	5.1	6.6
Asset impairment	2.0	1.7
Noncash provision for NARM and Shoal Creek loss	33.7	0.0
Net gain on disposals	(8.5)	(22.7)
Noncash income from port and rail capacity assignment	(9.4)	0.0
Net loss on early debt extinguishment	8.8	34.5
Income from equity affiliates	(9.7)	(120.9)
Foreign currency option contracts	(0.1)	4.4
Changes in current assets and liabilities:
Accounts receivable	126.6	(75.9)
Inventories	(59.9)	(50.7)
Other current assets	30.1	(40.6)
Accounts payable and accrued expenses	(29.2)	(61.6)
Collateral arrangements	(145.9)	(36.8)
Asset retirement obligations	3.9	6.0
Workers’ compensation obligations	(1.3)	(2.5)
Postretirement benefit obligations	(46.3)	(48.5)
Pension obligations	0.9	(1.7)
Other, net	(0.1)	3.5
Net cash provided by continuing operations	832.7	508.9
Net cash used in discontinued operations	(79.6)	(4.8)
Net cash provided by operating activities	753.1	504.1
Cash Flows From Investing Activities
Additions to property, plant, equipment and mine development	(190.4)	(104.5)
Changes in accrued expenses related to capital expenditures	(5.1)	(8.3)
Proceeds from disposal of assets, net of receivables	13.9	30.6
Contributions to joint ventures	(573.4)	(475.1)
Distributions from joint ventures	579.4	465.2
Advances to related parties	(0.1)	(1.3)
Cash receipts from Middlemount Coal Pty Ltd and other related parties	2.6	154.9
Other, net	(1.5)	(0.4)
Net cash (used in) provided by investing activities	(174.6)	61.1
Cash Flows From Financing Activities
Proceeds from long-term debt	0.0	545.0
Repayments of long-term debt	(6.9)	(846.3)
Payment of debt issuance and other deferred financing costs	(0.3)	(21.1)
Proceeds from Issuance of Common Stock	0.0	222.0
Common stock repurchases	(264.0)	0.0
Repurchase of employee common stock relinquished for tax withholding	(13.7)	(2.6)
Dividends paid	(20.7)	0.0
Distributions to noncontrolling interests	(58.9)	(17.5)
Net cash used in financing activities	(364.5)	(120.5)
Net change in cash, cash equivalents and restricted cash	214.0	444.7
Cash, cash equivalents and restricted cash at beginning of period (1)	1,417.6	954.3
Cash, cash equivalents and restricted cash at end of period (2)	1,631.6	$ 1,399.0
Cash and cash equivalents	988.5
Restricted Cash	$ 643.1