Peabody Energy (BTU) 10-Q 9 May 24 2024 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares shares in Millions	3 Months Ended
	Mar. 31, 2024	May 03, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2024
Document Transition Report	false
Entity File Number	1-16463
Entity Registrant Name	PEABODY ENERGY CORP
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	13-4004153
Entity Address, Address Line One	701 Market Street,
Entity Address, City or Town	St. Louis,
Entity Address, State or Province	MO
Entity Address, Postal Zip Code	63101-1826
City Area Code	314
Local Phone Number	342-3400
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	BTU
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		125.8
Entity Central Index Key	0001064728
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Amendment Flag	false

UNAUDITED CONDENSED CONSOLIDATE

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Statement [Abstract]
Revenues	$ 983.6	$ 1,364
Costs and expenses
Operating costs and expenses (exclusive of items shown separately below)	814.2	846.6
Depreciation, depletion and amortization	79.8	76.3
Asset retirement obligation expenses	12.9	15.4
Selling and administrative expenses	22	22.8
Restructuring charges	0.1	0.1
Other operating (income) loss:
Net gain on disposals	(2.1)	(1.9)
Asset impairment	0	2
Provision for NARM loss	1.8	0
Loss (income) from equity affiliates	3.7	(1.8)
Operating profit	51.2	404.5
Interest expense	14.7	18.4
Net loss on early debt extinguishment	0	6.8
Interest income	(19.2)	(13.1)
Net periodic benefit credit, excluding service cost	(10.1)	(9.7)
Income from continuing operations before income taxes	65.8	402.1
Income tax provision	20.1	118
Income from continuing operations, net of income taxes	45.7	284.1
Loss from discontinued operations, net of income taxes	(0.7)	(1.3)
Net income	45	282.8
Less: Net income attributable to noncontrolling interests	5.4	14.3
Net income attributable to common stockholders	$ 39.6	$ 268.5
Income from continuing operations:
Basic income per share	$ 0.32	$ 1.87
Diluted income per share	0.30	1.69
Net income attributable to common stockholders:
Basic income per share	0.31	1.86
Diluted income per share	$ 0.29	$ 1.68

UNAUDITED CONDENSED CONSOLIDA_2

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 45	$ 282.8
Postretirement plans (net of $0.0 tax provisions in each period)	(13.2)	(13.4)
Foreign currency translation adjustment	(1.9)	(0.2)
Other comprehensive loss, net of income taxes	(15.1)	(13.6)
Comprehensive income	29.9	269.2
Less: Net income attributable to noncontrolling interests	5.4	14.3
Comprehensive income attributable to common stockholders	$ 24.5	$ 254.9

UNAUDITED CONDENSED CONSOLIDA_3

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	$ 0	$ 0

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Current assets
Cash and cash equivalents	$ 855.7	$ 969.3
Accounts receivable, net of allowance for credit losses of $0.0 at March 31, 2024 and December 31, 2023	343.1	389.7
Inventories, net	404.3	351.8
Other current assets	298.4	308.9
Total current assets	1,901.5	2,019.7
Property, plant, equipment and mine development, net	2,830.2	2,844.1
Operating lease right-of-use assets	78.6	61.9
Restricted cash and collateral	836	957.6
Investments and other assets	82.1	78.8
Total assets	5,728.4	5,962.1
Current liabilities
Current portion of long-term debt	14.4	13.5
Accounts payable and accrued expenses	790.6	965.5
Total current liabilities	805	979
Long-term debt, less current portion	323.3	320.7
Deferred income taxes	37.2	28.6
Asset retirement obligations, less current portion	649	648.6
Accrued postretirement benefit costs	146.3	148.4
Operating lease liabilities, less current portion	61.5	47.7
Other noncurrent liabilities	179.5	181.6
Total liabilities	2,201.8	2,354.6
Stockholders’ equity
Preferred Stock — $0.01 per share par value; 100.0 shares authorized, no shares issued or outstanding as of March 31, 2024 and December 31, 2023	0	0
Series Common Stock — $0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of March 31, 2024 and December 31, 2023	0	0
Common Stock — $0.01 per share par value; 450.0 shares authorized, 189.0 shares issued and 125.8 shares outstanding as of March 31, 2024 and 188.6 shares issued and 128.7 shares outstanding as of December 31, 2023	1.9	1.9
Additional paid-in capital	3,985.1	3,983
Treasury stock, at cost — 63.2 and 59.9 common shares as of March 31, 2024 and December 31, 2023	(1,824.8)	(1,740.2)
Retained earnings	1,142.5	1,112.7
Accumulated other comprehensive income	174.5	189.6
Peabody Energy Corporation stockholders’ equity	3,479.2	3,547
Noncontrolling interests	47.4	60.5
Total stockholders’ equity	3,526.6	3,607.5
Total liabilities and stockholders’ equity	$ 5,728.4	$ 5,962.1
Treasury stock, shares (in shares)	63,200,000	59,900,000
Preferred Stock
Stockholders’ equity
Preferred stock, par value per share (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	100,000,000	100,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Series Common Stock
Stockholders’ equity
Common stock, par value per share (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	0	0
Common stock, shares outstanding (in shares)	0	0
Common Stock
Stockholders’ equity
Common stock, par value per share (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	450,000,000	450,000,000
Common stock, shares issued (in shares)	189,000,000	188,600,000
Common stock, shares outstanding (in shares)	125,800,000	128,700,000

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Current assets
Allowance for credit losses	$ 0	$ 0
Preferred Stock
Stockholders' equity
Preferred stock, par value per share (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	100,000,000	100,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Series Common Stock
Stockholders' equity
Common stock, par value per share (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	0	0
Common stock, shares outstanding (in shares)	0	0
Common Stock
Stockholders' equity
Common stock, par value per share (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	450,000,000	450,000,000
Common stock, shares issued (in shares)	189,000,000	188,600,000
Common stock, shares outstanding (in shares)	125,800,000	128,700,000

UNAUDITED CONDENSED CONSOLIDA_4

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash Flows From Operating Activities
Net income	$ 45	$ 282.8
Loss from discontinued operations, net of income taxes	0.7	1.3
Income from continuing operations, net of income taxes	45.7	284.1
Adjustments to reconcile income from continuing operations, net of income taxes to net cash provided by operating activities:
Depreciation, depletion and amortization	79.8	76.3
Noncash interest expense, net	1.3	1.6
Deferred income taxes	8.5	46
Noncash share-based compensation	2	1.7
Asset impairment	0	2
Net gain on disposals	(2.1)	(1.9)
Noncash income from port and rail capacity assignment	0	(9.2)
Net loss on early debt extinguishment	0	6.8
Loss (income) from equity affiliates	3.7	(1.8)
Foreign currency option contracts	5.7	2.2
Changes in current assets and liabilities:
Accounts receivable	46.8	70.8
Inventories	(52.6)	(35.4)
Other current assets	13.6	43.5
Accounts payable and accrued expenses	(169.5)	(39.6)
Collateral arrangements	151.3	(45.9)
Asset retirement obligations	0.4	2.5
Workers’ compensation obligations	(0.1)	(0.9)
Postretirement benefit obligations	(15.4)	(14.4)
Pension obligations	0	0.4
Other, net	1.2	0.6
Net cash provided by continuing operations	120.3	389.4
Net cash used in discontinued operations	(1.3)	(3.1)
Net cash provided by operating activities	119	386.3
Cash Flows From Investing Activities
Additions to property, plant, equipment and mine development	(61.4)	(55.7)
Changes in accrued expenses related to capital expenditures	(6.8)	(1.6)
Proceeds from disposal of assets, net of receivables	2.4	2.9
Contributions to joint ventures	(202.8)	(206.2)
Distributions from joint ventures	193.2	202
Other, net	0.2	0.1
Net cash used in investing activities	(75.2)	(58.5)
Cash Flows From Financing Activities
Repayments of long-term debt	(2.2)	(2.7)
Payment of debt issuance and other deferred financing costs	(10.8)	(0.3)
Common stock repurchases	(83.1)	0
Repurchase of employee common stock relinquished for tax withholding	(3.4)	(13.2)
Dividends paid	(9.7)	0
Distributions to noncontrolling interests	(18.5)	(22.8)
Net cash used in financing activities	(127.7)	(39)
Net change in cash, cash equivalents and restricted cash	(83.9)	288.8
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)	1,566.3	$ 1,706.4
Cash and cash equivalents	855.7
Restricted Cash	$ 710.6

UNAUDITED CONDENSED CONSOLIDA_5

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($) $ in Millions	Total	Common Stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive income	Noncontrolling interests	Treasury Stock, Common
Balance, beginning of period at Dec. 31, 2022		$ 1.9	$ 3,975.9	$ 383.9	$ 242.5	$ 63.5	$ (1,372.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividend equivalent units on dividends declared			0
Share-based compensation for equity-classified awards			1.7
Net income	$ 282.8			268.5		14.3
Dividends declared ($0.075 and $0.000 per share, respectively)				0
Common stock repurchases	0						0
Unsettled common stock repurchases							0
Sales and Excise Tax Payable							0
Repurchase of employee common stock relinquished for tax withholding	(13.2)						(13.2)
Postretirement plans (net of $0.0 tax provisions in each period)	(13.4)				(13.4)
Foreign currency translation adjustment	(0.2)				(0.2)
Distributions to noncontrolling interests						(22.8)
Balance, end of period at Mar. 31, 2023	3,529.7	1.9	3,977.6	652.4	228.9	55	(1,386.1)
Balance, beginning of period at Dec. 31, 2023	3,607.5	1.9	3,983	1,112.7	189.6	60.5	(1,740.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividend equivalent units on dividends declared			0.1
Share-based compensation for equity-classified awards			2
Net income	45			39.6		5.4
Dividends declared ($0.075 and $0.000 per share, respectively)				(9.8)
Common stock repurchases	83.1						(83.1)
Unsettled common stock repurchases							2.6
Sales and Excise Tax Payable							(0.7)
Repurchase of employee common stock relinquished for tax withholding	(3.4)						(3.4)
Postretirement plans (net of $0.0 tax provisions in each period)	(13.2)				(13.2)
Foreign currency translation adjustment	(1.9)				(1.9)
Distributions to noncontrolling interests						(18.5)
Balance, end of period at Mar. 31, 2024	$ 3,526.6	$ 1.9	$ 3,985.1	$ 1,142.5	$ 174.5	$ 47.4	$ (1,824.8)

UNAUDITED CONDENSED CONSOLIDA_6

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY (Parenthetical) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	$ 0	$ 0
Retained earnings
Dividends declared per share	$ 0.075	$ 0
Accumulated other comprehensive income
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	$ 0	$ 0

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The unaudited condensed consolidated financial statements include the accounts of Peabody Energy Corporation (PEC) and its consolidated subsidiaries and affiliates (along with PEC, the Company or Peabody). Interests in subsidiaries controlled by the Company are consolidated with any outside stockholder interests reflected as noncontrolling interests, except when the Company has an undivided interest in a joint venture. In those cases, the Company includes its proportionate share in the assets, liabilities, revenue and expenses of the jointly controlled entities within each applicable line item of the unaudited condensed consolidated financial statements. All intercompany transactions, profits and balances have been eliminated in consolidation. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (U.S. GAAP) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for complete financial statements and should be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023. In the opinion of management, these financial statements reflect all normal, recurring adjustments necessary for a fair presentation. Balance sheet information presented herein as of December 31, 2023 has been derived from the Company’s audited consolidated balance sheet at that date. The Company’s results of operations for the three months ended March 31, 2024 are not necessarily indicative of the results that may be expected for future quarters or for the year ending December 31, 2024.

Accounting Policies

Accounting Policies	3 Months Ended
	Mar. 31, 2024
Accounting Policies [Abstract]
Newly Adopted Accounting Standards and Accounting Standards Not Yet Implemented	Newly Adopted Accounting Standards and Accounting Standards Not Yet Implemented Newly Adopted Accounting Standards The Company did not adopt any new accounting standards that had a material impact on its unaudited condensed consolidated financial statements or disclosures. Accounting Standards Not Yet Implemented Joint Ventures. In August 2023, Accounting Standards Update (ASU) 2023-05 was issued, which requires joint ventures to recognize and measure the initial contributions of monetary and nonmonetary assets and its net assets at fair value. The Company is required to apply the amendments for joint ventures with a formation date on or after January 1, 2025. A joint venture that was formed before January 1, 2025 may apply the amendments retrospectively. The Company will apply the guidance to any newly formed joint ventures. Segments. In November 2023, ASU 2023-07 was issued, which requires public entities to provide in interim periods all disclosures about a reportable segment’s profit or loss that are currently required annually; disclose significant expense categories and amounts that are easily computable from the management reports that are regularly provided to the chief operating decision maker (CODM); disclose how the CODM uses each reported measure to allocate resources; and disclose the name and title of the position of the individual identified as the CODM. The Company is required to adopt the amendments for fiscal years beginning after December 15, 2023 and interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. The Company expects this ASU to only impact its disclosures with no impacts to its consolidated results of operations, cash flows and financial condition. Income Taxes . In December 2023, ASU 2023-09 was issued, which requires public entities to disclose more information primarily related to the income tax rate reconciliation and income taxes paid. The guidance also eliminates certain existing disclosure requirements related to uncertain tax positions and unrecognized deferred tax liabilities. The Company is required to adopt the amendments for fiscal years beginning after December 15, 2024. The amendments should be applied prospectively, with a retrospective option. Early adoption is permitted. The Company expects this ASU to only impact its disclosures with no impacts to its consolidated results of operations, cash flows and financial condition.

Revenue Recognition

Revenue Recognition	3 Months Ended
	Mar. 31, 2024
Revenue Recognition [Abstract]
Revenue Recognition	Revenue Recognition Refer to Note 1. “Summary of Significant Accounting Policies” in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023, for the Company’s policies regarding “Revenue” and “Accounts receivable, net.” Disaggregation of Revenue Revenue by product type and market is set forth in the following tables. With respect to its seaborne reporting segments, the Company classifies as “Export” certain revenue from domestically-delivered coal under contracts in which the price is derived on a basis similar to export contracts. Three Months Ended March 31, 2024 Seaborne Thermal Seaborne Metallurgical Powder River Basin Other U.S. Thermal Corporate and Other (1) Consolidated (Dollars in millions) Thermal coal Domestic $ 40.6 $ — $ 254.1 $ 178.0 $ — $ 472.7 Export 243.1 — — — — 243.1 Total thermal 283.7 — 254.1 178.0 — 715.8 Metallurgical coal Export — 244.0 — — — 244.0 Total metallurgical — 244.0 — — — 244.0 Other (2) 0.2 3.0 — 13.6 7.0 23.8 Revenue $ 283.9 $ 247.0 $ 254.1 $ 191.6 $ 7.0 $ 983.6 Three Months Ended March 31, 2023 Seaborne Thermal Seaborne Metallurgical Powder River Basin Other U.S. Thermal Corporate and Other (1) Consolidated (Dollars in millions) Thermal coal Domestic $ 37.5 $ — $ 305.0 $ 247.9 $ — $ 590.4 Export 308.8 — — — — 308.8 Total thermal 346.3 — 305.0 247.9 — 899.2 Metallurgical coal Export — 287.2 — — — 287.2 Total metallurgical — 287.2 — — — 287.2 Other (2) 0.2 1.2 0.3 1.5 174.4 177.6 Revenue $ 346.5 $ 288.4 $ 305.3 $ 249.4 $ 174.4 $ 1,364.0 (1) Corporate and Other includes the following: Three Months Ended March 31, 2024 2023 (Dollars in millions) Unrealized gains on derivative contracts related to forecasted sales $ — $ 118.7 Realized losses on derivative contracts related to forecasted sales — (50.6) Revenue from physical sale of coal (3) 2.1 84.5 Other (2) 4.9 21.8 Total Corporate and Other $ 7.0 $ 174.4 (2) Includes revenue from arrangements such as customer contract-related payments associated with volume shortfalls; royalties related to coal lease agreements; sales agency commissions; farm income; property and facility rentals; and revenue related to the Company’s assignment of rights to its excess port and rail capacity. (3) Includes revenue recognized upon the physical sale of coal purchased from the Company’s operating segments and sold to customers through the Company’s coal trading business as part of settling certain derivative contracts. Primarily represents the difference between the price contracted with the customer and the price allocated to the operating segment. Accounts Receivable “Accounts receivable, net” at March 31, 2024 and December 31, 2023 consisted of the following: March 31, 2024 December 31, 2023 (Dollars in millions) Trade receivables, net $ 273.6 $ 322.3 Miscellaneous receivables, net 69.5 67.4 Accounts receivable, net $ 343.1 $ 389.7 None of the above receivables included allowances for credit losses at March 31, 2024 or December 31, 2023. No charges for credit losses were recognized during the three months ended March 31, 2024 or 2023.

Inventories

Inventories	3 Months Ended
	Mar. 31, 2024
Inventory Disclosure [Abstract]
Inventories	Inventories “Inventories, net” as of March 31, 2024 and December 31, 2023 consisted of the following: March 31, 2024 December 31, 2023 (Dollars in millions) Materials and supplies, net $ 161.4 $ 153.0 Raw coal 125.8 105.6 Saleable coal 117.1 93.2 Inventories, net $ 404.3 $ 351.8

Equity Method Investments

Equity Method Investments	3 Months Ended
	Mar. 31, 2024
Equity Method Investment, Summarized Financial Information [Abstract]
Equity Method Investments	Equity Method Investments The Company’s equity method investments include its joint venture interest in Middlemount Coal Pty Ltd (Middlemount), R3 Renewables LLC (R3) and certain other equity method investments. The table below summarizes the book value of those investments, which are reported in “Investments and other assets” in the condensed consolidated balance sheets, and the related “Loss (income) from equity affiliates”: Loss (Income) from Equity Affiliates Book Value at Three Months Ended March 31, March 31, 2024 December 31, 2023 2024 2023 (Dollars in millions) Equity method investment related to Middlemount $ 40.1 $ 42.5 $ 0.4 $ (2.6) Equity method investment related to R3 8.3 7.1 3.3 0.8 Total equity method investments $ 48.4 $ 49.6 $ 3.7 $ (1.8) R3 In March 2022, the Company entered into a joint venture with unrelated partners to form R3. R3 was formed with the intent of developing various sites, including certain reclaimed mining land held by the Company in the U.S., for utility-scale photovoltaic solar generation and battery storage. The Company contributed $4.5 million and $2.0 million to R3 during the three months ended March 31, 2024 and 2023, respectively.

Derivatives and Fair Value Meas

Derivatives and Fair Value Measurements	3 Months Ended
	Mar. 31, 2024
Fair Value Disclosures [Abstract]
Derivatives and Fair Value Measurements	Derivatives and Fair Value Measurements Derivatives From time to time, the Company may utilize various types of derivative instruments to manage its exposure to risks in the normal course of business, including (1) foreign currency exchange rate risk and the variability of cash flows associated with forecasted Australian dollar expenditures made in its Australian mining platform and (2) price risk of fluctuating coal prices related to forecasted sales or purchases of coal, or changes in the fair value of a fixed price physical sales contract. These risk management activities are actively monitored for compliance with the Company’s risk management policies. On a limited basis, the Company engages in the direct and brokered trading of coal and freight-related contracts. Except those contracts for which the Company has elected to apply a normal purchases and normal sales exception, all derivative coal trading contracts are accounted for at fair value. Foreign Currency The Company utilizes options and collars to hedge currency risk associated with anticipated Australian dollar operating expenditures. As of March 31, 2024, the Company held average rate options with an aggregate notional amount of $516.0 million Australian dollars to hedge currency risk associated with anticipated Australian dollar operating expenditures over the nine-month period ending December 31, 2024. The instruments entitle the Company to receive payment on the notional amount should the quarterly average Australian dollar-to-U.S. dollar exchange rate exceed amounts ranging from $0.69 to $0.72 over the nine-month period ending December 31, 2024. As of March 31, 2024, the Company also held purchased collars with an aggregate notional amount of $431.0 million Australian dollars related to anticipated Australian dollar operating expenditures during the nine-month period ending December 31, 2024. The purchased collars have a floor and ceiling of approximately $0.59 and $0.72, respectively, whereby the Company will incur a loss on the instruments for rates below the floor and a gain for rates above the ceiling. Derivative Contracts Related to Forecasted Sales As of March 31, 2024, the Company had no coal derivative contracts related to its forecasted sales. Historically, such financial contracts have included futures and forwards. Financial Trading Contracts On a limited basis, the Company may enter coal or freight derivative contracts for trading purposes. Such financial contracts may include futures, forwards and options. The Company held nominal financial trading contracts as of March 31, 2024. Tabular Derivatives Disclosures The Company has master netting agreements with certain of its counterparties which allow for the settlement of contracts in an asset position with contracts in a liability position in the event of default or termination. Such netting arrangements reduce the Company’s credit exposure related to these counterparties. For classification purposes, the Company records the net fair value of all the positions with a given counterparty as a net asset or liability in the condensed consolidated balance sheets. As of March 31, 2024 and December 31, 2023, the Company had asset derivatives comprised of foreign currency option contracts with a fair value of $0.7 million and $6.2 million, respectively. The net amount of asset derivatives is included in “Other current assets” in the accompanying condensed consolidated balance sheets. Currently, the Company does not seek cash flow hedge accounting treatment for its derivative financial instruments and thus changes in fair value are reflected in current earnings. The tables below show the amounts of pretax gains and losses related to the Company’s derivatives and their classification within the accompanying unaudited condensed consolidated statements of operations. Three Months Ended March 31, 2024 Total loss recognized in income Loss realized in income on derivatives Unrealized loss recognized in income on derivatives Derivative Instrument Classification (Dollars in millions) Foreign currency option contracts Operating costs and expenses $ (6.5) $ (0.8) $ (5.7) Total $ (6.5) $ (0.8) $ (5.7) Three Months Ended March 31, 2023 Total (loss) gain recognized in income (Loss) gain realized in income on derivatives Unrealized (loss) gain recognized in income on derivatives Derivative Instrument Classification (Dollars in millions) Foreign currency option contracts Operating costs and expenses $ (5.0) $ (2.8) $ (2.2) Derivative contracts related to forecasted sales Revenue 68.1 (50.6) 118.7 Financial trading contracts Revenue — 17.3 (17.3) Total $ 63.1 $ (36.1) $ 99.2 The Company classifies the cash effects of its derivatives within the “Cash Flows From Operating Activities” section of the unaudited condensed consolidated statements of cash flows. Fair Value Measurements The Company uses a three-level fair value hierarchy that categorizes assets and liabilities measured at fair value based on the observability of the inputs utilized in the valuation. These levels include: Level 1 - inputs are quoted prices in active markets for the identical assets or liabilities; Level 2 - inputs are other than quoted prices included in Level 1 that are directly or indirectly observable through market-corroborated inputs; and Level 3 - inputs are unobservable, or observable but cannot be market-corroborated, requiring the Company to make assumptions about pricing by market participants. The following tables set forth the hierarchy of the Company’s net asset positions for which fair value is measured on a recurring basis. March 31, 2024 Level 1 Level 2 Level 3 Total (Dollars in millions) Foreign currency option contracts $ — $ 0.7 $ — $ 0.7 Equity securities 0.9 — — 0.9 Total net assets $ 0.9 $ 0.7 $ — $ 1.6 December 31, 2023 Level 1 Level 2 Level 3 Total (Dollars in millions) Foreign currency option contracts $ — $ 6.2 $ — $ 6.2 Equity securities 0.4 — — 0.4 Total net assets $ 0.4 $ 6.2 $ — $ 6.6 For Level 1 and 2 financial assets and liabilities, the Company utilizes both direct and indirect observable price quotes, including interest rate yield curves, exchange indices, broker/dealer quotes, published indices, issuer spreads, benchmark securities and other market quotes. In the case of certain debt securities, fair value is provided by a third-party pricing service. Below is a summary of the Company’s valuation techniques for Level 1 and 2 financial assets and liabilities: • Foreign currency option contracts are valued utilizing inputs obtained in quoted public markets (Level 2) except when credit and non-performance risk is considered to be a significant input, then the Company classifies such contracts as Level 3. • Derivative contracts related to forecasted sales and financial trading contracts are generally valued based on unadjusted quoted prices in active markets (Level 1) or a valuation that is corroborated by the use of market-based pricing (Level 2) except when credit and non-performance risk is considered to be a significant input (greater than 10% of fair value), then the Company classifies as Level 3. • Investments in equity securities are currently based on unadjusted quoted prices in active markets (Level 1). Other Financial Instruments . The following methods and assumptions were used by the Company in estimating fair values for other financial instruments as of March 31, 2024 and December 31, 2023: • Cash and cash equivalents, restricted cash, accounts receivable, including those within the Company’s accounts receivable securitization program, margining cash, notes receivable and accounts payable have carrying values which approximate fair value due to the short maturity or the liquid nature of these instruments. • Long-term debt fair value estimates are based on observed prices for securities when available (Level 2), and otherwise on estimated borrowing rates to discount the cash flows to their present value (Level 3). Market risk associated with the Company’s fixed-rate long-term debt relates to the potential reduction in the fair value from an increase in interest rates. The fair value of debt, shown below, is principally based on reported market values and estimates based on interest rates, maturities, credit risk, underlying collateral and completed market transactions. March 31, 2024 December 31, 2023 (Dollars in millions) Total debt at par value $ 345.3 $ 342.3 Less: Unamortized debt issuance costs (7.6) (8.1) Net carrying amount $ 337.7 $ 334.2 Estimated fair value $ 477.0 $ 483.9 The Company’s risk management function, which is independent of the Company’s coal trading function, is responsible for valuation policies and procedures, with oversight from executive management. The fair value of the Company’s coal derivative assets and liabilities reflects adjustments for credit risk. The Company’s exposure to credit risk is substantially with electric utilities, energy marketers, steel producers and nonfinancial trading houses. Significant increases or decreases in the inputs in isolation could result in a significantly higher or lower fair value measurement. The unobservable inputs do not have a direct interrelationship; therefore, a change in one unobservable input would not necessarily correspond with a change in another unobservable input. During the three months ended March 31, 2023, the entity in which the Company held a Level 3 investment in equity securities completed a merger transaction and its shares were exchanged for the shares of the newly-combined entity, which are publicly traded. The Company recorded an impairment loss of $2.0 million upon the exchange of shares. The Company had no transfers between Levels 1, 2 and 3 during the three months ended March 31, 2024 and 2023. The Company’s policy is to value all transfers between levels using the beginning of period valuation.

Property, Plant, Equipment and

Property, Plant, Equipment and Mine Development	3 Months Ended
	Mar. 31, 2024
Property, Plant and Equipment [Abstract]
Property, Plant, Equipment and Mine Development	Property, Plant, Equipment and Mine Development The composition of property, plant, equipment and mine development, net, as of March 31, 2024 and December 31, 2023 is set forth in the table below: March 31, 2024 December 31, 2023 (Dollars in millions) Land and coal interests $ 2,475.1 $ 2,475.2 Buildings and improvements 645.4 647.6 Machinery and equipment 1,842.0 1,787.6 Less: Accumulated depreciation, depletion and amortization (2,132.3) (2,066.3) Property, plant, equipment and mine development, net $ 2,830.2 $ 2,844.1 Asset Impairment and Other At-Risk Assets

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2024
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	Income Taxes The Company's effective tax rate before remeasurement for the three months ended March 31, 2024 is based on the Company’s estimated full year effective tax rate, comprised of expected statutory tax provision, offset by foreign rate differential and changes in valuation allowance. The Company’s income tax provisions of $20.1 million and $118.0 million for the three months ended March 31, 2024 and 2023, respectively, included a tax benefit of $5.8 million and a tax provision of $0.4 million, respectively, related to the remeasurement of foreign income tax accounts. The Company’s estimated full year pretax income and income tax expense are expected to be primarily generated in Australia.

Long-term Debt

Long-term Debt	3 Months Ended
	Mar. 31, 2024
Debt Disclosure [Abstract]
Long-term Debt	Long-term Debt The Company’s total indebtedness as of March 31, 2024 and December 31, 2023 consisted of the following: Debt Instrument (defined below, as applicable) March 31, 2024 December 31, 2023 (Dollars in millions) 3.250% Convertible Senior Notes due March 2028 (2028 Convertible Notes) $ 320.0 $ 320.0 Finance lease obligations 25.3 22.3 Less: Debt issuance costs (7.6) (8.1) 337.7 334.2 Less: Current portion of long-term debt 14.4 13.5 Long-term debt $ 323.3 $ 320.7 2028 Convertible Notes On March 1, 2022, through a private offering, the Company issued the 2028 Convertible Notes in the aggregate principal amount of $320.0 million. The 2028 Convertible Notes are senior unsecured obligations of the Company and are governed under an indenture. The Company used the proceeds of the offering of the 2028 Convertible Notes and available cash to redeem its then-existing senior secured notes, and to pay related premiums, fees and expenses relating to the offering and redemptions. The Company capitalized $11.2 million of debt issuance costs related to the offering, which are being amortized over the terms of the notes. The 2028 Convertible Notes will mature on March 1, 2028, unless earlier converted, redeemed or repurchased in accordance with their terms. The 2028 Convertible Notes bear interest at a rate of 3.250% per year, payable semi-annually in arrears on March 1 and September 1 of each year. The initial conversion rate for the 2028 Convertible Notes was 50.3816 shares of the Company’s common stock per $1,000 principal amount of 2028 Convertible Notes, which represented an initial conversion price of approximately $19.85 per share of the Company’s common stock. The terms of the indenture require conversion rate adjustments upon the payment of dividends to holders of the Company’s common stock once such cumulative dividends impact the conversion rate by at least 1%. Effective February 21, 2024, the conversion rate was increased to 51.0440 shares of the Company’s common stock per $1,000 principal amount of 2028 Convertible Notes, which represented an adjusted conversion price of approximately $19.59 per share of the Company’s common stock. The conversion rate is subject to further adjustment under certain circumstances in accordance with the terms of the indenture. During the first quarter of 2024, the Company’s reported common stock prices did not prompt the conversion feature of the 2028 Convertible Notes. As a result, the 2028 Convertible Notes will not be convertible at the option of the holders during the second quarter of 2024. As of March 31, 2024, the if-converted value of the 2028 Convertible Notes exceeded the principal amount by $76.3 million. Revolving Credit Facility The Company established a new revolving credit facility with a maximum aggregate principal amount of $320.0 million in revolving commitments by entering into a credit agreement, dated as of January 18, 2024 (the 2024 Credit Agreement), by and among the Company, as borrower, certain subsidiaries of the Company party thereto, PNC Bank, National Association, as administrative agent, and the lenders party thereto. The Company paid aggregate debt issuance costs of $9.7 million. The revolving commitments and any related loans, if applicable (any such loans, the Revolving Loans), established by the 2024 Credit Agreement terminate or mature, as applicable, on January 18, 2028, subject to certain conditions relating to the Company’s outstanding 2028 Convertible Notes. The Revolving Loans bear interest at a secured overnight financing rate (SOFR) plus an applicable margin ranging from 3.50% to 4.25%, depending on the Company’s total net leverage ratio (as defined under the 2024 Credit Agreement) or a base rate plus an applicable margin ranging from 2.50% to 3.25%, at the Company’s option. Letters of credit issued under the 2024 Credit Agreement incur a combined fee equal to an applicable margin ranging from 3.50% to 4.25% plus a fronting fee equal to 0.125% per annum. Unused capacity under the 2024 Credit Agreement bears a commitment fee of 0.50% per annum. As of March 31, 2024, the 2024 Credit Agreement had only been utilized for letters of credit, including $99.0 million outstanding as of March 31, 2024. These letters of credit support the Company’s reclamation bonding requirements, lease obligations, insurance policies and various other performance guarantees as further described in Note 12. “Financial Instruments and Other Guarantees.” Availability under the 2024 Credit Agreement was $221.0 million at March 31, 2024. The 2024 Credit Agreement contains customary covenants that, among other things and subject to certain exceptions (including compliance with financial ratios), may limit the Company and its subsidiaries’ ability to incur additional indebtedness, make certain restricted payments or investments, sell or otherwise dispose of assets, enter into transactions with affiliates, create or incur liens, and merge, consolidate or sell all or substantially all of their assets. The 2024 Credit Agreement is secured by substantially all assets of the Company and its U.S. subsidiaries, as well as a pledge of two Australian subsidiaries. Interest Charges The following table presents the components of the Company’s interest expense related to its indebtedness and financial assurance instruments such as surety bonds and letters of credit. Additionally, the table sets forth the amount of cash paid for interest and the amount of non-cash interest expense primarily related to the amortization of debt issuance costs. Three Months Ended March 31, 2024 2023 (Dollars in millions) 2028 Convertible Notes $ 2.6 $ 2.6 Finance lease obligations 0.4 0.5 Financial assurance instruments 8.8 12.0 Amortization of debt issuance costs 1.2 1.6 Other 1.7 1.7 Interest expense $ 14.7 $ 18.4 Cash paid for interest $ 11.5 $ 19.1 Non-cash interest expense $ 1.3 $ 1.6 Covenant Compliance

Pension and Postretirement Bene

Pension and Postretirement Benefit Costs	3 Months Ended
	Mar. 31, 2024
Retirement Benefits [Abstract]
Pension and Postretirement Benefit Costs	Pension and Postretirement Benefit Costs The components of net periodic pension and postretirement benefit costs, excluding the service cost for benefits earned, are included in “Net periodic benefit credit, excluding service cost” in the unaudited condensed consolidated statements of operations. Net periodic pension cost included the following components: Three Months Ended March 31, 2024 2023 (Dollars in millions) Interest cost on projected benefit obligation $ 1.6 $ 7.4 Expected return on plan assets (1.2) (6.6) Net periodic pension cost $ 0.4 $ 0.8 Prior to January 1, 2024, the Company had two qualified pension plans. During the year ended December 31, 2023, the Company settled its pension obligation for one of its qualified plans. Refer to Note 14. “Pension and Savings Plans” in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023, for information regarding the settlement of the plan’s obligation. Annual contributions to the remaining qualified plan are made in accordance with minimum funding standards and the Company’s agreement with the Pension Benefit Guaranty Corporation. Funding decisions also consider certain funded status thresholds defined by the Pension Protection Act of 2006. As of March 31, 2024, the Company’s remaining qualified plan was expected to be at or above the Pension Protection Act thresholds. The Company is not required to make any cash contributions to its remaining qualified pension plan in 2024 based on minimum funding requirements and does not expect to make any discretionary cash contributions in 2024. Net periodic postretirement benefit credit included the following components: Three Months Ended March 31, 2024 2023 (Dollars in millions) Service cost for benefits earned $ 0.1 $ 0.1 Interest cost on accumulated postretirement benefit obligation 2.3 2.5 Expected return on plan assets (0.1) (0.1) Amortization of prior service credit (13.2) (13.4) Net periodic postretirement benefit credit $ (10.9) $ (10.9) The Company has established a Voluntary Employees’ Beneficiary Association (VEBA) trust to pre-fund a portion of benefits for non-represented retirees. The Company does not expect to make any discretionary contributions to the VEBA trust in 2024 and plans to utilize a portion of VEBA assets to make certain benefit payments.

Earnings per Share (EPS)

Earnings per Share (EPS)	3 Months Ended
	Mar. 31, 2024
Earnings Per Share [Abstract]
Earnings per Share (EPS)	Earnings per Share (EPS) Basic EPS is computed based on the weighted average number of shares of common stock outstanding during the period. Diluted EPS is computed based on the weighted average number of shares of common stock plus the effect of dilutive potential common shares outstanding. As such, the Company includes the 2028 Convertible Notes and share-based compensation awards in its potentially dilutive securities. Generally, dilutive securities are not included in the computation of loss per share when a company reports a net loss from continuing operations as the impact would be anti-dilutive. For all but performance units, the potentially dilutive impact of the Company’s share-based compensation awards is determined using the treasury stock method. Under the treasury stock method, awards are treated as if they had been exercised with any proceeds used to repurchase common stock at the average market price during the period. Any incremental difference between the assumed number of shares issued and purchased is included in the diluted share computation. For performance units, their contingent features result in an assessment for any potentially dilutive common stock by using the end of the reporting period as if it were the end of the contingency period for all units granted. A conversion of the 2028 Convertible Notes may result in payment in the Company’s common stock. For diluted EPS purposes, the potentially dilutive common stock is assumed to have been converted at the beginning of the period (or at the time of issuance, if later). In periods where the potentially dilutive common stock is included in the computation of diluted EPS, the numerator will be adjusted to add back tax adjusted interest expense, which includes the amortization of debt issuance costs, related to the convertible debt. The computation of diluted EPS excluded aggregate share-based compensation awards of less than 0.1 million for the three months ended March 31, 2024 and 2023 because to do so would have been anti-dilutive for those periods. Because the potential dilutive impact of such share-based compensation awards is calculated under the treasury stock method, anti-dilution generally occurs when the exercise prices or unrecognized compensation cost per share of such awards are higher than the Company’s average stock price during the applicable period. Anti-dilution also occurs when a company reports a net loss from continuing operations, and the dilutive impact of all share-based compensation awards are excluded accordingly. The following illustrates the earnings allocation method utilized in the calculation of basic and diluted EPS. Three Months Ended March 31, 2024 2023 (In millions, except per share data) Basic EPS numerator: Income from continuing operations, net of income taxes $ 45.7 $ 284.1 Less: Net income attributable to noncontrolling interests 5.4 14.3 Income from continuing operations attributable to common stockholders 40.3 269.8 Loss from discontinued operations, net of income taxes (0.7) (1.3) Net income attributable to common stockholders $ 39.6 $ 268.5 Diluted EPS numerator: Income from continuing operations, net of income taxes $ 45.7 $ 284.1 Add: Tax adjusted interest expense related to 2028 Convertible Notes 3.1 2.6 Less: Net income attributable to noncontrolling interests 5.4 14.3 Income from continuing operations attributable to common stockholders 43.4 272.4 Loss from discontinued operations, net of income taxes (0.7) (1.3) Net income attributable to common stockholders $ 42.7 $ 271.1 EPS denominator: Weighted average shares outstanding — basic 128.1 144.6 Dilutive impact of share-based compensation awards 0.6 0.7 Dilutive impact of 2028 Convertible Notes 16.2 16.1 Weighted average shares outstanding — diluted 144.9 161.4 Basic EPS attributable to common stockholders: Income from continuing operations $ 0.32 $ 1.87 Loss from discontinued operations (0.01) (0.01) Net income attributable to common stockholders $ 0.31 $ 1.86 Diluted EPS attributable to common stockholders: Income from continuing operations $ 0.30 $ 1.69 Loss from discontinued operations (0.01) (0.01) Net income attributable to common stockholders $ 0.29 $ 1.68

Financial Instruments and Other

Financial Instruments and Other Guarantees	3 Months Ended
	Mar. 31, 2024
Financial Instruments And Guarantees [Abstract]
Financial Instruments and Other Guarantees	Financial Instruments and Other Guarantees In the normal course of business, the Company is a party to various guarantees and financial instruments that carry off-balance-she et risk and are not reflected in the accompanying condensed consolidated balance sheets. Such financial instruments provide support for the Company’s reclamation bonding requirements, lease obligations, insurance policies and various other performance guarantees. The Company periodically evaluates the instruments for on-balance-sheet treatment based on the amount of exposure under the instrument and the likelihood of required performance. The Company does not expect any material losses to result from these guarantees or off-balance-sheet instruments in excess of liabilities provided for in the accompanying condensed consolidated balance sheets. The following table summarizes the Company’s financial instruments that carry off-balance-sheet risk. March 31, 2024 Reclamation Support Other Support (1) Total (Dollars in millions) Surety bonds $ 962.1 $ 108.2 $ 1,070.3 Letters of credit (2) 53.6 98.5 152.1 1,015.7 206.7 1,222.4 Less: Letters of credit in support of surety bonds (3) (53.6) (14.4) (68.0) Obligations supported, net $ 962.1 $ 192.3 $ 1,154.4 (1) Instruments support obligations related to pension and health care plans, workers’ compensation, property and casualty insurance, customer and vendor contracts and certain restoration ancillary to prior mining activities. (2) Amounts do not include cash-collateralized letters of credit. (3) Certain letters of credit serve as collateral for surety bonds at the request of surety bond providers. Surety Agreement Amendment and Collateral Requirements In April 2023, the Company amended its existing agreement with the providers of its surety bond portfolio, dated November 6, 2020. Under the April 2023 amendment, the Company and its surety providers agreed to a maximum aggregate collateral amount of $721.8 million based upon bonding levels at the effective date of the amendment. This maximum collateral amount will vary prospectively as bonding levels increase or decrease. The amendment extended the agreement through December 31, 2026. In order to maintain the maximum collateral agreement, the Company must remain compliant with a minimum liquidity test and a maximum net leverage ratio, as measured each quarter. The minimum liquidity test requires the Company to maintain liquidity at the greater of $400 million or the difference between the penal sum of all surety bonds and the amount of collateral posted in favor of surety providers, which was $521.8 million at March 31, 2024. The Company must also maintain a maximum net leverage ratio of 1.5 to 1.0, where the numerator consists of its funded debt, net of cash, and the denominator consists of its Adjusted EBITDA for the trailing twelve months. For purposes of calculating the ratio, only 50% of the outstanding principal amount of the Company’s 2028 Convertible Notes is deemed to be funded debt. The Company’s ability to pay dividends and make share repurchases is also subject to the quarterly minimum liquidity test. The Company is in compliance with such requirements at March 31, 2024. To fund the maximum collateral amount, the Company deposited $566.3 million into trust accounts for the benefit of certain surety providers on March 31, 2023. The remainder was comprised of $140.5 million of existing cash-collateralized letters of credit and $15.0 million already held on behalf of a surety provider. The amendment became effective on April 14, 2023, when the Company terminated a then-existing credit agreement which, as amended, provided for $237.2 million of capacity for irrevocable standby letters of credit (LC Facility). LC Facility The now-terminated LC Facility had an original capacity of $324.0 million and was subsequently amended at various dates to reduce its capacity and effect certain other changes, including in February 2023 to reduce capacity by $65.0 million, accelerate the expiration date to December 31, 2023 from December 31, 2024, and eliminate the prepayment premium due upon any reduction of commitments thereunder prior to July 29, 2023. The Company recorded early debt extinguishment losses of $6.8 million during the three months ended March 31, 2023, primarily as a result of the February 2023 amendment. Prior to its termination, undrawn letters of credit under the LC Facility bore interest at 6.00% per annum and unused commitments were subject to a 0.50% per annum commitment fee. Accounts Receivable Securitization In 2017, the Company entered into the Sixth Amended and Restated Receivables Purchase Agreement, as amended from time to time (the Receivables Purchase Agreement.) The receivables securitization program authorized under the agreement (Securitization Program) is subject to customary events of default. The Receivables Purchase Agreement was amended in February 2023 to increase the available funding capacity from $175.0 million to $225.0 million and adjust the relevant interest rate for borrowings to a SOFR. Such funding is accounted for as a secured borrowing, limited to the availability of eligible receivables, and may be secured by a combination of collateral and the trade receivables underlying the program. Funding capacity under the Securitization Program may also be utilized for letters of credit in support of other obligations, which has been the Company’s primary utilization. Borrowings under the Securitization Program bear interest at SOFR plus 2.1% per annum and remain outstanding throughout the term of the agreement, subject to the Company maintaining sufficient eligible receivables. At March 31, 2024, the Com pany h ad no outstanding borrowings and $53.1 million of letters of credit outstanding under the Securitization Program. Availability under the Securitization Program, which is adjusted for certain ineligible receivables, was $80.7 million at March 31, 2024. The Company was not required to post cash collateral under the Securitization Program at March 31, 2024. The Company incurred interest and fees associated with the Securitization Program of $0.8 million and $1.0 million during the three months ended March 31, 2024 and 2023, respectively, which have been recorded as “Interest expense” in the accompanying unaudited condensed consolidated statements of operations. Credit Support Facilities In February 2022, the Company entered into an agreement which provides up to $250.0 million of capacity for irrevocable standby letters of credit, primarily to support reclamation bonding requirements. The agreement requires the Company to provide cash collateral at a level of 103% of the aggregate amount of letters of credit outstanding under the arrangement (limited to $5.0 million total excess collateralization.) Outstanding letters of credit bear a fixed fee in the amount of 0.75% per annum. The Company receives a variable deposit rate on the amount of cash collateral posted in support of letters of credit. The agreement has an initial expiration date of December 31, 2025. At March 31, 2024, letters of credit of $116.6 million were outstanding under the agreement, which were collateralized by cash of $120.1 million. In December 2023, the Company established cash-backed bank guarantee facilities, primarily to support Australian reclamation bonding requirements. During the three months ended March 31, 2024, the Company capitalized $1.1 million of debt issuance costs related to these bank guarantee facilities. The Company receives a variable deposit rate on the amount of cash collateral posted in support of the bank guarantee facilities, which mature at various dates between 2026 and 2029. At March 31, 2024, the bank guarantee facilities were backed by cash of $177.0 million. Restricted Cash and Collateral The following table summarizes the Company’s “Restricted cash and collateral” in the accompanying condensed consolidated balance sheets. Restricted cash balances are held in controlled accounts with minimum balance requirements; withdrawals are subject to the approval of account beneficiaries, such as the Company’s surety providers, who have perfected security interests in the funds. The Company’s other cash collateral generally includes deposits held by regulatory authorities or financial institutions over which the Company has no control or ability to access. March 31, 2024 December 31, 2023 (Dollars in millions) Restricted cash (1) Surety trust accounts (2) $ 413.5 $ 444.0 Credit support facilities (2) 297.1 236.9 710.6 680.9 Other cash collateral (1) Deposits with regulatory authorities for reclamation and other obligations 125.4 276.7 125.4 276.7 Restricted cash and collateral $ 836.0 $ 957.6 (1) Restricted cash balances are combined with unrestricted cash and cash equivalents in the accompanying unaudited condensed consolidated statements of cash flows; changes between unrestricted cash and cash equivalents and restricted cash balances are thus not reflected in the operating, investing or financing activities therein. Changes in other cash collateral balances are reflected as operating activities therein. (2) Surety trust accounts, the funding for collateralized letters of credit and cash supporting the bank guarantee facilities are comprised of highly liquid investments with original maturities of three months or less; interest and other earnings on such funds accrue to the Company.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Commitments Unconditional Purchase Obligations As of March 31, 2024, purchase commitments for capital expenditures were $100.0 million, all of which is obligated within the next two years, with $92.9 million obligated within the next 12 months. There were no other material changes to the Company’s commitments from the information provided in Note 21. “Commitments and Contingencies” to the consolidated financial statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023. Contingencies From time to time, the Company or its subsidiaries are involved in legal proceedings arising in the ordinary course of business or related to indemnities or historical operations. The Company believes it has recorded adequate reserves for these liabilities. The Company discusses its significant legal proceedings below, including ongoing proceedings and those that impacted the Company’s consolidated results of operations for the periods presented. Litigation and Matters Relating to Continuing Operations Metropolitan Mine Stormwater Discharge. Significantly high rainfall in New South Wales, including unprecedented rain totals at the Metropolitan Mine site resulted in stormwater being discharged from the mine site on several occasions in 2021 and 2022. On September 6, 2023, the Environment Protection Authority commenced a prosecution for five breaches of the Protection of the Environment Operations Act 1997 relating to the stormwater discharges. On March 15, 2024, the Company pled guilty to two of the charges related to water pollution, and two charges related to a failure to adequately maintain plant and equipment were consolidated into one charge to which the Company also pled guilty. No plea has been entered for the remaining charge that has been held over to a sentencing hearing to be scheduled later in the year. Penalties will be determined at that sentencing hearing. During the three months ended March 31, 2024, the Company recorded an immaterial provision to establish a current liability that the Company believes is probable and reasonably estimable. Oregon Climate Change Lawsuit. On July 20, 2023, Peabody Energy was served with a summons issued on behalf of Multnomah County, Oregon. The complaint seeks damages from the Company and other major energy producers for allegedly causing an “extreme heat event” in Multnomah County in late June and early July 2021. The causes of action, pursuant to Oregon state law, include a failure to warn, false or misleading advertisement and public nuisance. The Company will defend the claim and will continue to assert all applicable defenses available in regards to these claims. Other At times, the Company becomes a party to other disputes, including those related to contract miner performance, claims, lawsuits, arbitration proceedings, regulatory investigations and administrative procedures in the ordinary course of business in the U.S., Australia and other countries where the Company does business. Based on current information, the Company believes that such other pending or threatened proceedings are likely to be resolved without a material adverse effect on its consolidated financial condition, results of operations or cash flows. The Company reassesses the probability and estimability of contingent losses as new information becomes available.

Segment Information

Segment Information	3 Months Ended
	Mar. 31, 2024
Segment Reporting [Abstract]
Segment Information	Segment Information The Company reports its results of operations primarily through the following reportable segments: Seaborne Thermal, Seaborne Metallurgical, Powder River Basin, Other U.S. Thermal and Corporate and Other. The Company’s CODM, defined as its Chief Executive Officer, uses Adjusted EBITDA as the primary metric to measure the segments’ operating performance and allocate resources. Adjusted EBITDA is a non-GAAP financial measure defined as income from continuing operations before deducting net interest expense, income taxes, asset retirement obligation expenses and depreciation, depletion and amortization. Adjusted EBITDA is also adjusted for the discrete items that management excluded in analyzing the segments’ operating performance, as displayed in the reconciliation below. Management believes this non-GAAP performance measure is also used by investors to measure the Company’s operating performance. Adjusted EBITDA is not intended to serve as an alternative to U.S. GAAP measures of performance and may not be comparable to similarly-titled measures presented by other companies. Reportable segment results were as follows: Three Months Ended March 31, 2024 2023 (Dollars in millions) Revenue: Seaborne Thermal $ 283.9 $ 346.5 Seaborne Metallurgical 247.0 288.4 Powder River Basin 254.1 305.3 Other U.S. Thermal 191.6 249.4 Corporate and Other 7.0 174.4 Total $ 983.6 $ 1,364.0 Adjusted EBITDA: Seaborne Thermal $ 93.8 $ 164.0 Seaborne Metallurgical 48.3 90.8 Powder River Basin 16.4 35.8 Other U.S. Thermal 46.5 64.2 Corporate and Other (44.5) 35.8 Total $ 160.5 $ 390.6 A reconciliation of consolidated income from continuing operations, net of income taxes to Adjusted EBITDA follows: Three Months Ended March 31, 2024 2023 (Dollars in millions) Income from continuing operations, net of income taxes $ 45.7 $ 284.1 Depreciation, depletion and amortization 79.8 76.3 Asset retirement obligation expenses 12.9 15.4 Restructuring charges 0.1 0.1 Asset impairment — 2.0 Provision for NARM loss 1.8 — Changes in amortization of basis difference related to equity affiliates (0.4) (0.3) Interest expense 14.7 18.4 Net loss on early debt extinguishment — 6.8 Interest income (19.2) (13.1) Unrealized gains on derivative contracts related to forecasted sales — (118.7) Unrealized losses on foreign currency option contracts 5.7 2.2 Take-or-pay contract-based intangible recognition (0.7) (0.6) Income tax provision 20.1 118.0 Adjusted EBITDA $ 160.5 $ 390.6

Other Events

Other Events	3 Months Ended
	Mar. 31, 2024
Other Events [Abstract]
Other Events	Other Events Coal Deposit Acquisition The Company entered into a definitive agreement dated October 26, 2023, to acquire the southern part of the Wards Well tenements (Wards Well area) which are adjacent to the Company’s Centurion Mine in Queensland, Australia. The acquisition was completed on April 16, 2024 for cash consideration of approximately $134 million and a contingent royalty of up to $200 million. The royalty will only be payable once the Company has recovered its investment and development costs of the Wards Well area and if the average sales price achieved exceeds certain thresholds. No royalty is payable if the Company does not commence mining in the Wards Well area. Share Repurchases During the three months ended March 31, 2024, the Company repurchased approximately 3.2 million shares of its common stock for $80.5 million, including commission fees. As of March 31, 2024, the Company had accrued excise taxes of $4.0 million related to share repurchases, which were unpaid at March 31, 2024. The Company includes commission fees and excise taxes, as incurred, with the cost of treasury stock. At March 31, 2024, $569.6 million remained available under its share repurchase program. North Antelope Rochelle Mine Tornado On June 23, 2023, the Company’s North Antelope Rochelle Mine sustained damage from a tornado which led to a temporary suspension of operations. The mine resumed operations on June 25, 2023. During the three months ended March 31, 2024, the Company recorded a provision for loss of $1.8 million for incremental repair costs related to the tornado damage. The Company anticipates that immaterial incremental repair costs will continue to be recognized in the second quarter of 2024. Shoal Creek Incident On March 29, 2023, the Company’s Shoal Creek Mine experienced a fire involving void fill material utilized to stabilize the roof structure of the mine. On June 20, 2023, the Company announced that the Shoal Creek Mine, in coordination with the Mine Safety and Health Administration, had safely completed localized sealing of the affected area of the mine. In October 2023, the Company filed an insurance claim against applicable insurance policies with combined business interruption and property loss limits of $125 million above a $50 million deductible. Port and Rail Capacity Assignment During the three months ended March 31, 2023, the Company entered into an agreement to assign the right to its excess port and rail capacity related to its Centurion Mine in exchange for $30.0 million Australian dollars. Half of such amount was received by the Company upon entry into the agreement, and half was payable in June 2024, subject to certain conditions. In connection with the transaction, the Company recorded revenue of $19.2 million during the three months ended March 31, 2023 and had a discounted receivable of $9.8 million included in “Accounts receivable, net” as of March 31, 2024. In association with the completion of the Wards Well acquisition described above, the remaining receivable was settled as of April 16, 2024.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pay vs Performance Disclosure
Net Income (Loss)	$ 39.6	$ 268.5

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Mar. 31, 2024 shares
Trading Arrangements, by Individual
Material Terms of Trading Arrangement	Securities Trading Plans of Directors and Executive Officers During the three months ended March 31, 2024, the Peabody directors or officers listed below adopted or terminated a “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement,” as defined in Item 408 of Regulation S-K of the Exchange Act. On March 6, 2024, Mark A. Spurbeck, Executive Vice President and Chief Financial Officer, terminated a prearranged stock trading plan pursuant to Rule 10b5-1, which was adopted on May 2, 2022 and provided for the sale of up to 35,264 shares of Peabody common stock until January 31, 2025 or the earlier completion of all authorized transactions under the plan. An aggregate of 11,653 shares were sold under this plan. The amount of shares available for sale represents the maximum number of shares that could potentially be sold pursuant to the Rule 10b5-1 trading arrangement, including sales made in connection with the vesting of future equity awards. Accordingly, in calculating this amount, Peabody does not consider any potential reductions in shares available to be sold due to tax withholding at the time such equity awards vest, and, for performance-based awards, assumes such awards will vest at maximum value.
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	true
Non-Rule 10b5-1 Arrangement Terminated	false
Mark A. Spurbeck [Member]
Trading Arrangements, by Individual
Name	Mark A. Spurbeck
Title	Executive Vice President and Chief Financial Officer
Adoption Date	May 2, 2022
Rule 10b5-1 Arrangement Terminated	true
Termination Date	March 6, 2024
Aggregate Available	35,264

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities (Policies)	3 Months Ended
	Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Corporate Hedging - Coal Trading	Significant increases or decreases in the inputs in isolation could result in a significantly higher or lower fair value measurement. The unobservable inputs do not have a direct interrelationship; therefore, a change in one unobservable input would not necessarily correspond with a change in another unobservable input.
Corporate Hedging	From time to time, the Company may utilize various types of derivative instruments to manage its exposure to risks in the normal course of business, including (1) foreign currency exchange rate risk and the variability of cash flows associated with forecasted Australian dollar expenditures made in its Australian mining platform and (2) price risk of fluctuating coal prices related to forecasted sales or purchases of coal, or changes in the fair value of a fixed price physical sales contract. These risk management activities are actively monitored for compliance with the Company’s risk management policies. On a limited basis, the Company engages in the direct and brokered trading of coal and freight-related contracts. Except those contracts for which the Company has elected to apply a normal purchases and normal sales exception, all derivative coal trading contracts are accounted for at fair value.

Revenue Recognition (Tables)

Revenue Recognition (Tables)	3 Months Ended
	Mar. 31, 2024
Revenue Recognition [Abstract]
Disaggregation of Revenue by Product Type and Market	With respect to its seaborne reporting segments, the Company classifies as “Export” certain revenue from domestically-delivered coal under contracts in which the price is derived on a basis similar to export contracts. Three Months Ended March 31, 2024 Seaborne Thermal Seaborne Metallurgical Powder River Basin Other U.S. Thermal Corporate and Other (1) Consolidated (Dollars in millions) Thermal coal Domestic $ 40.6 $ — $ 254.1 $ 178.0 $ — $ 472.7 Export 243.1 — — — — 243.1 Total thermal 283.7 — 254.1 178.0 — 715.8 Metallurgical coal Export — 244.0 — — — 244.0 Total metallurgical — 244.0 — — — 244.0 Other (2) 0.2 3.0 — 13.6 7.0 23.8 Revenue $ 283.9 $ 247.0 $ 254.1 $ 191.6 $ 7.0 $ 983.6 Three Months Ended March 31, 2023 Seaborne Thermal Seaborne Metallurgical Powder River Basin Other U.S. Thermal Corporate and Other (1) Consolidated (Dollars in millions) Thermal coal Domestic $ 37.5 $ — $ 305.0 $ 247.9 $ — $ 590.4 Export 308.8 — — — — 308.8 Total thermal 346.3 — 305.0 247.9 — 899.2 Metallurgical coal Export — 287.2 — — — 287.2 Total metallurgical — 287.2 — — — 287.2 Other (2) 0.2 1.2 0.3 1.5 174.4 177.6 Revenue $ 346.5 $ 288.4 $ 305.3 $ 249.4 $ 174.4 $ 1,364.0 (1) Corporate and Other includes the following: Three Months Ended March 31, 2024 2023 (Dollars in millions) Unrealized gains on derivative contracts related to forecasted sales $ — $ 118.7 Realized losses on derivative contracts related to forecasted sales — (50.6) Revenue from physical sale of coal (3) 2.1 84.5 Other (2) 4.9 21.8 Total Corporate and Other $ 7.0 $ 174.4 (2) Includes revenue from arrangements such as customer contract-related payments associated with volume shortfalls; royalties related to coal lease agreements; sales agency commissions; farm income; property and facility rentals; and revenue related to the Company’s assignment of rights to its excess port and rail capacity. (3) Includes revenue recognized upon the physical sale of coal purchased from the Company’s operating segments and sold to customers through the Company’s coal trading business as part of settling certain derivative contracts. Primarily represents the difference between the price contracted with the customer and the price allocated to the operating segment.
Schedule of Accounts Receivable	“Accounts receivable, net” at March 31, 2024 and December 31, 2023 consisted of the following: March 31, 2024 December 31, 2023 (Dollars in millions) Trade receivables, net $ 273.6 $ 322.3 Miscellaneous receivables, net 69.5 67.4 Accounts receivable, net $ 343.1 $ 389.7

Inventories (Tables)

Inventories (Tables)	3 Months Ended
	Mar. 31, 2024
Inventory Disclosure [Abstract]
Schedule of Inventories	“Inventories, net” as of March 31, 2024 and December 31, 2023 consisted of the following: March 31, 2024 December 31, 2023 (Dollars in millions) Materials and supplies, net $ 161.4 $ 153.0 Raw coal 125.8 105.6 Saleable coal 117.1 93.2 Inventories, net $ 404.3 $ 351.8

Receivables, Loans, Notes Recei

Receivables, Loans, Notes Receivable, and Others (Tables)	3 Months Ended
	Mar. 31, 2024
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investments	The table below summarizes the book value of those investments, which are reported in “Investments and other assets” in the condensed consolidated balance sheets, and the related “Loss (income) from equity affiliates”: Loss (Income) from Equity Affiliates Book Value at Three Months Ended March 31, March 31, 2024 December 31, 2023 2024 2023 (Dollars in millions) Equity method investment related to Middlemount $ 40.1 $ 42.5 $ 0.4 $ (2.6) Equity method investment related to R3 8.3 7.1 3.3 0.8 Total equity method investments $ 48.4 $ 49.6 $ 3.7 $ (1.8)

Derivatives and Fair Value Me_2

Derivatives and Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2024
Fair Value Disclosures [Abstract]
Derivative Instruments, Gain (Loss)	The tables below show the amounts of pretax gains and losses related to the Company’s derivatives and their classification within the accompanying unaudited condensed consolidated statements of operations. Three Months Ended March 31, 2024 Total loss recognized in income Loss realized in income on derivatives Unrealized loss recognized in income on derivatives Derivative Instrument Classification (Dollars in millions) Foreign currency option contracts Operating costs and expenses $ (6.5) $ (0.8) $ (5.7) Total $ (6.5) $ (0.8) $ (5.7) Three Months Ended March 31, 2023 Total (loss) gain recognized in income (Loss) gain realized in income on derivatives Unrealized (loss) gain recognized in income on derivatives Derivative Instrument Classification (Dollars in millions) Foreign currency option contracts Operating costs and expenses $ (5.0) $ (2.8) $ (2.2) Derivative contracts related to forecasted sales Revenue 68.1 (50.6) 118.7 Financial trading contracts Revenue — 17.3 (17.3) Total $ 63.1 $ (36.1) $ 99.2
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following tables set forth the hierarchy of the Company’s net asset positions for which fair value is measured on a recurring basis. March 31, 2024 Level 1 Level 2 Level 3 Total (Dollars in millions) Foreign currency option contracts $ — $ 0.7 $ — $ 0.7 Equity securities 0.9 — — 0.9 Total net assets $ 0.9 $ 0.7 $ — $ 1.6 December 31, 2023 Level 1 Level 2 Level 3 Total (Dollars in millions) Foreign currency option contracts $ — $ 6.2 $ — $ 6.2 Equity securities 0.4 — — 0.4 Total net assets $ 0.4 $ 6.2 $ — $ 6.6
Carrying Amounts And Estimated Fair Values Of Companys Debt	The fair value of debt, shown below, is principally based on reported market values and estimates based on interest rates, maturities, credit risk, underlying collateral and completed market transactions. March 31, 2024 December 31, 2023 (Dollars in millions) Total debt at par value $ 345.3 $ 342.3 Less: Unamortized debt issuance costs (7.6) (8.1) Net carrying amount $ 337.7 $ 334.2 Estimated fair value $ 477.0 $ 483.9

Property, Plant, Equipment an_2

Property, Plant, Equipment and Mine Development (Tables)	3 Months Ended
	Mar. 31, 2024
Property, Plant and Equipment [Abstract]
Schedule of Property, Plant, Equipment and Mine Development	The composition of property, plant, equipment and mine development, net, as of March 31, 2024 and December 31, 2023 is set forth in the table below: March 31, 2024 December 31, 2023 (Dollars in millions) Land and coal interests $ 2,475.1 $ 2,475.2 Buildings and improvements 645.4 647.6 Machinery and equipment 1,842.0 1,787.6 Less: Accumulated depreciation, depletion and amortization (2,132.3) (2,066.3) Property, plant, equipment and mine development, net $ 2,830.2 $ 2,844.1

Long-term Debt (Tables)

Long-term Debt (Tables)	3 Months Ended
	Mar. 31, 2024
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	The Company’s total indebtedness as of March 31, 2024 and December 31, 2023 consisted of the following: Debt Instrument (defined below, as applicable) March 31, 2024 December 31, 2023 (Dollars in millions) 3.250% Convertible Senior Notes due March 2028 (2028 Convertible Notes) $ 320.0 $ 320.0 Finance lease obligations 25.3 22.3 Less: Debt issuance costs (7.6) (8.1) 337.7 334.2 Less: Current portion of long-term debt 14.4 13.5 Long-term debt $ 323.3 $ 320.7
Schedule of Interest Charges	Additionally, the table sets forth the amount of cash paid for interest and the amount of non-cash interest expense primarily related to the amortization of debt issuance costs. Three Months Ended March 31, 2024 2023 (Dollars in millions) 2028 Convertible Notes $ 2.6 $ 2.6 Finance lease obligations 0.4 0.5 Financial assurance instruments 8.8 12.0 Amortization of debt issuance costs 1.2 1.6 Other 1.7 1.7 Interest expense $ 14.7 $ 18.4 Cash paid for interest $ 11.5 $ 19.1 Non-cash interest expense $ 1.3 $ 1.6

Pension and Postretirement Be_2

Pension and Postretirement Benefit Costs (Tables)	3 Months Ended
	Mar. 31, 2024
Retirement Benefits [Abstract]
Schedule of Net Benefit Costs	Net periodic pension cost included the following components: Three Months Ended March 31, 2024 2023 (Dollars in millions) Interest cost on projected benefit obligation $ 1.6 $ 7.4 Expected return on plan assets (1.2) (6.6) Net periodic pension cost $ 0.4 $ 0.8 Net periodic postretirement benefit credit included the following components: Three Months Ended March 31, 2024 2023 (Dollars in millions) Service cost for benefits earned $ 0.1 $ 0.1 Interest cost on accumulated postretirement benefit obligation 2.3 2.5 Expected return on plan assets (0.1) (0.1) Amortization of prior service credit (13.2) (13.4) Net periodic postretirement benefit credit $ (10.9) $ (10.9)

Earnings per Share (EPS) (Table

Earnings per Share (EPS) (Tables)	3 Months Ended
	Mar. 31, 2024
Earnings Per Share [Abstract]
Earnings Allocation Method Utilized in the Calculation of Basic and Diluted EPS	The following illustrates the earnings allocation method utilized in the calculation of basic and diluted EPS. Three Months Ended March 31, 2024 2023 (In millions, except per share data) Basic EPS numerator: Income from continuing operations, net of income taxes $ 45.7 $ 284.1 Less: Net income attributable to noncontrolling interests 5.4 14.3 Income from continuing operations attributable to common stockholders 40.3 269.8 Loss from discontinued operations, net of income taxes (0.7) (1.3) Net income attributable to common stockholders $ 39.6 $ 268.5 Diluted EPS numerator: Income from continuing operations, net of income taxes $ 45.7 $ 284.1 Add: Tax adjusted interest expense related to 2028 Convertible Notes 3.1 2.6 Less: Net income attributable to noncontrolling interests 5.4 14.3 Income from continuing operations attributable to common stockholders 43.4 272.4 Loss from discontinued operations, net of income taxes (0.7) (1.3) Net income attributable to common stockholders $ 42.7 $ 271.1 EPS denominator: Weighted average shares outstanding — basic 128.1 144.6 Dilutive impact of share-based compensation awards 0.6 0.7 Dilutive impact of 2028 Convertible Notes 16.2 16.1 Weighted average shares outstanding — diluted 144.9 161.4 Basic EPS attributable to common stockholders: Income from continuing operations $ 0.32 $ 1.87 Loss from discontinued operations (0.01) (0.01) Net income attributable to common stockholders $ 0.31 $ 1.86 Diluted EPS attributable to common stockholders: Income from continuing operations $ 0.30 $ 1.69 Loss from discontinued operations (0.01) (0.01) Net income attributable to common stockholders $ 0.29 $ 1.68

Guarantees (Tables)

Guarantees (Tables)	3 Months Ended
	Mar. 31, 2024
Guarantees and Product Warranties [Abstract]
Financial Instruments and Guarantees with Off Balance Sheet Risk	The following table summarizes the Company’s financial instruments that carry off-balance-sheet risk. March 31, 2024 Reclamation Support Other Support (1) Total (Dollars in millions) Surety bonds $ 962.1 $ 108.2 $ 1,070.3 Letters of credit (2) 53.6 98.5 152.1 1,015.7 206.7 1,222.4 Less: Letters of credit in support of surety bonds (3) (53.6) (14.4) (68.0) Obligations supported, net $ 962.1 $ 192.3 $ 1,154.4 (1) Instruments support obligations related to pension and health care plans, workers’ compensation, property and casualty insurance, customer and vendor contracts and certain restoration ancillary to prior mining activities. (2) Amounts do not include cash-collateralized letters of credit. (3) Certain letters of credit serve as collateral for surety bonds at the request of surety bond providers.
Restricted Cash and Collateral	The Company’s other cash collateral generally includes deposits held by regulatory authorities or financial institutions over which the Company has no control or ability to access. March 31, 2024 December 31, 2023 (Dollars in millions) Restricted cash (1) Surety trust accounts (2) $ 413.5 $ 444.0 Credit support facilities (2) 297.1 236.9 710.6 680.9 Other cash collateral (1) Deposits with regulatory authorities for reclamation and other obligations 125.4 276.7 125.4 276.7 Restricted cash and collateral $ 836.0 $ 957.6 (1) Restricted cash balances are combined with unrestricted cash and cash equivalents in the accompanying unaudited condensed consolidated statements of cash flows; changes between unrestricted cash and cash equivalents and restricted cash balances are thus not reflected in the operating, investing or financing activities therein. Changes in other cash collateral balances are reflected as operating activities therein. (2) Surety trust accounts, the funding for collateralized letters of credit and cash supporting the bank guarantee facilities are comprised of highly liquid investments with original maturities of three months or less; interest and other earnings on such funds accrue to the Company.

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2024
Segment Reporting [Abstract]
Reportable Segment Results	Reportable segment results were as follows: Three Months Ended March 31, 2024 2023 (Dollars in millions) Revenue: Seaborne Thermal $ 283.9 $ 346.5 Seaborne Metallurgical 247.0 288.4 Powder River Basin 254.1 305.3 Other U.S. Thermal 191.6 249.4 Corporate and Other 7.0 174.4 Total $ 983.6 $ 1,364.0 Adjusted EBITDA: Seaborne Thermal $ 93.8 $ 164.0 Seaborne Metallurgical 48.3 90.8 Powder River Basin 16.4 35.8 Other U.S. Thermal 46.5 64.2 Corporate and Other (44.5) 35.8 Total $ 160.5 $ 390.6
Reconciliation of Consolidated (Loss) Income from Continuing Operations, Net of Income Taxes to Adjusted EBITDA	A reconciliation of consolidated income from continuing operations, net of income taxes to Adjusted EBITDA follows: Three Months Ended March 31, 2024 2023 (Dollars in millions) Income from continuing operations, net of income taxes $ 45.7 $ 284.1 Depreciation, depletion and amortization 79.8 76.3 Asset retirement obligation expenses 12.9 15.4 Restructuring charges 0.1 0.1 Asset impairment — 2.0 Provision for NARM loss 1.8 — Changes in amortization of basis difference related to equity affiliates (0.4) (0.3) Interest expense 14.7 18.4 Net loss on early debt extinguishment — 6.8 Interest income (19.2) (13.1) Unrealized gains on derivative contracts related to forecasted sales — (118.7) Unrealized losses on foreign currency option contracts 5.7 2.2 Take-or-pay contract-based intangible recognition (0.7) (0.6) Income tax provision 20.1 118.0 Adjusted EBITDA $ 160.5 $ 390.6

Revenue Recognition - Revenue b

Revenue Recognition - Revenue by Product Type and Market (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Revenues	$ 983.6	$ 1,364
Other Income	4.9	21.8
Designated as Hedging Instrument
Disaggregation of Revenue [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	(5.7)	99.2
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(0.8)	(36.1)
Derivative, Gain (Loss) on Derivative, Net	(6.5)	63.1
Physical commodity purchase / sale contracts [Member] | Designated as Hedging Instrument
Disaggregation of Revenue [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax		118.7
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	0	(50.6)
Derivative, Gain (Loss) on Derivative, Net		68.1
Coal Contract [Member] | Designated as Hedging Instrument
Disaggregation of Revenue [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax		(17.3)
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net		17.3
Derivative, Gain (Loss) on Derivative, Net		0
Coal Contract and Physical commodity purchase / sale contracts | Designated as Hedging Instrument
Disaggregation of Revenue [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	0	118.7
Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	715.8	899.2
Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	244	287.2
Other (2)
Disaggregation of Revenue [Line Items]
Revenues	23.8	177.6
Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	472.7	590.4
Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	243.1	308.8
Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	244	287.2
Seaborne Thermal
Disaggregation of Revenue [Line Items]
Revenues	283.9	346.5
Seaborne Thermal | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	283.7	346.3
Seaborne Thermal | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0	0
Seaborne Thermal | Other (2)
Disaggregation of Revenue [Line Items]
Revenues	0.2	0.2
Seaborne Thermal | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	40.6	37.5
Seaborne Thermal | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	243.1	308.8
Seaborne Thermal | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0	0
Seaborne Metallurgical
Disaggregation of Revenue [Line Items]
Revenues	247	288.4
Seaborne Metallurgical | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0	0
Seaborne Metallurgical | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	244	287.2
Seaborne Metallurgical | Other (2)
Disaggregation of Revenue [Line Items]
Revenues	3	1.2
Seaborne Metallurgical | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0	0
Seaborne Metallurgical | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0	0
Seaborne Metallurgical | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	244	287.2
Powder River Basin
Disaggregation of Revenue [Line Items]
Revenues	254.1	305.3
Powder River Basin | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	254.1	305
Powder River Basin | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0	0
Powder River Basin | Other (2)
Disaggregation of Revenue [Line Items]
Revenues	0	0.3
Powder River Basin | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	254.1	305
Powder River Basin | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0	0
Powder River Basin | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0	0
Other U.S. Thermal
Disaggregation of Revenue [Line Items]
Revenues	191.6	249.4
Other U.S. Thermal | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	178	247.9
Other U.S. Thermal | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0	0
Other U.S. Thermal | Other (2)
Disaggregation of Revenue [Line Items]
Revenues	13.6	1.5
Other U.S. Thermal | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	178	247.9
Other U.S. Thermal | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0	0
Other U.S. Thermal | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0	0
Corporate and Other (1)
Disaggregation of Revenue [Line Items]
Revenues	7	174.4
Corporate and Other (1) | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0	0
Corporate and Other (1) | Trading and Brokerage Coal Deliveries
Disaggregation of Revenue [Line Items]
Revenues	2.1	84.5
Corporate and Other (1) | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0	0
Corporate and Other (1) | Other (2)
Disaggregation of Revenue [Line Items]
Revenues	7	174.4
Corporate and Other (1) | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0	0
Corporate and Other (1) | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0	0
Corporate and Other (1) | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	$ 0	$ 0

Revenue Recognition - Accounts

Revenue Recognition - Accounts Receivable (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Revenue Recognition [Abstract]
Trade receivables, net	$ 273.6	$ 322.3
Miscellaneous receivables, net	69.5	67.4
Accounts receivable, net	$ 343.1	$ 389.7

Revenue Recognition - Narrative

Revenue Recognition - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Revenue Recognition [Abstract]
Accounts receivable, allowance for credit loss	$ 0		$ 0
Accounts receivable, credit loss expense (reversal)	$ 0	$ 0

Inventories (Details)

Inventories (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Inventory [Line Items]
Materials and supplies, net	$ 161.4	$ 153
Raw coal	125.8	105.6
Saleable coal	117.1	93.2
Inventories, net	$ 404.3	$ 351.8

Inventories Narrative (Details)

Inventories Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Material and supplies
Inventory [Line Items]
inventory reserves	$ 6.4	$ 7.2

Equity Method Investments (Deta

Equity Method Investments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 48.4		$ 49.6
Loss (income) from equity affiliates	3.7	$ (1.8)
Middlemount Mine
Schedule of Equity Method Investments [Line Items]
Equity method investments	40.1		42.5
Loss (income) from equity affiliates	(0.4)	2.6
R3 Renewables
Schedule of Equity Method Investments [Line Items]
Equity method investments	8.3		$ 7.1
Loss (income) from equity affiliates	$ (3.3)	$ (0.8)

Equity Method Investments Narra

Equity Method Investments Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2024	Mar. 31, 2023
R3 Renewables
Schedule of Equity Method Investments [Line Items]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	$ 4.5	$ 2

Derivatives and Fair Value Me_3

Derivatives and Fair Value Measurements - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($) $ / $	Mar. 31, 2023 USD ($)	Mar. 31, 2024 AUD ($) $ / $	Dec. 31, 2023 USD ($)
Derivatives, Fair Value [Line Items]
Unobservable Measurement Input, Uncertainty, Description	10
Asset impairment	$ 0	$ 2
Fair Value, Inputs, Level 1, 2 and 3
Derivatives, Fair Value [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	$ 0	$ 0
Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Notional amount			$ 516,000,000
Foreign Exchange Contract [Member] | Minimum
Derivatives, Fair Value [Line Items]
Derivative, exchange rate cap (in dollars per share) | $ / $	0.69		0.69
Foreign Exchange Contract [Member] | Maximum
Derivatives, Fair Value [Line Items]
Derivative, exchange rate cap (in dollars per share) | $ / $	0.72		0.72
Foreign Exchange Contract [Member] | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 0.7			$ 6.2
Coal derivative contracts related to forecasted sales
Derivatives, Fair Value [Line Items]
Notional amount			$ 0
Foreign Exchange Option
Derivatives, Fair Value [Line Items]
Notional amount			$ 431,000,000
Derivative, Floor Price			0.59
Derivative, Cap Price			0.72

Derivatives and Fair Value Me_4

Derivatives and Fair Value Measurements - Gains and Losses on Hedging Derivatives (Details) - Designated as Hedging Instrument - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ (6.5)	$ 63.1
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(0.8)	(36.1)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	(5.7)	99.2
Foreign Exchange Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(6.5)	(5)
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(0.8)	(2.8)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	(5.7)	(2.2)
Physical commodity purchase / sale contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net		68.1
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 0	(50.6)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax		118.7
Coal Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net		0
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net		17.3
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax		$ (17.3)

Derivatives and Fair Value Me_5

Derivatives and Fair Value Measurements - Financial Instruments Measured on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Derivative [Line Items]
Total net assets	$ 1.6	$ 6.6
Level 1
Derivative [Line Items]
Total net assets	0.9	0.4
Level 2
Derivative [Line Items]
Total net assets	0.7	6.2
Level 3
Derivative [Line Items]
Total net assets	0	0
Foreign Exchange Contract [Member]
Derivative [Line Items]
Total net assets	0.7	6.2
Foreign Exchange Contract [Member] | Level 1
Derivative [Line Items]
Total net assets	0	0
Foreign Exchange Contract [Member] | Level 2
Derivative [Line Items]
Total net assets	0.7	6.2
Foreign Exchange Contract [Member] | Level 3
Derivative [Line Items]
Total net assets	0	0
Equity securities
Derivative [Line Items]
Total net assets	0.9	0.4
Equity securities | Level 1
Derivative [Line Items]
Total net assets	0.9	0.4
Equity securities | Level 2
Derivative [Line Items]
Total net assets	0	0
Equity securities | Level 3
Derivative [Line Items]
Total net assets	$ 0	$ 0

Derivatives and Fair Value Me_6

Derivatives and Fair Value Measurements - Long-term debt (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt and Lease Obligation, Net	$ 337.7	$ 334.2
Carrying amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt at par value	345.3	342.3
Less: Unamortized debt issuance costs	(7.6)	(8.1)
Debt and Lease Obligation, Net	337.7	334.2
Estimated fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value	$ 477	$ 483.9

Property, Plant, Equipment an_3

Property, Plant, Equipment and Mine Development (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Less: Accumulated depreciation, depletion and amortization	$ (2,132.3)	$ (2,066.3)
Property, plant, equipment and mine development, net	2,830.2	2,844.1
Land and coal interests
Property, Plant and Equipment [Line Items]
Property, Plant, Equipment, and mine development, gross	2,475.1	2,475.2
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, Plant, Equipment, and mine development, gross	645.4	647.6
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, Plant, Equipment, and mine development, gross	$ 1,842	$ 1,787.6

Property, Plant, Equipment an_4

Property, Plant, Equipment and Mine Development - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Impaired Long-Lived Assets Held and Used [Line Items]
At-risk assets	$ 219
Asset impairment	$ 0	$ 2

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Taxes
Income tax provision (benefit)	$ 20.1	$ 118
Foreign Tax Authority
Income Taxes
Remeasurement of income tax	$ (5.8)	$ 0.4

Long-term Debt - Schedule of De

Long-term Debt - Schedule of Debt (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Carrying amount
Debt Instrument [Line Items]
Less: Unamortized debt issuance costs	$ (7.6)		$ (8.1)
Total debt	337.7		334.2
Finance lease obligations	25.3		22.3
Total debt	337.7		334.2
Less: Current portion of long-term debt	14.4		13.5
Long-term debt	323.3		320.7
Interest expense	14.7	$ 18.4
Interest Paid, Capitalized, Investing Activities	11.5	19.1
Noncash interest expense, net	1.3	1.6
Financial assurance instruments
Debt Instrument [Line Items]
Interest expense	8.8	12
Indebtedness
Debt Instrument [Line Items]
Interest expense	2.6	2.6
Capital Lease Obligations
Debt Instrument [Line Items]
Interest expense	0.4	0.5
Amortization of debt issuance costs
Debt Instrument [Line Items]
Interest expense	1.2	1.6
Other
Debt Instrument [Line Items]
Interest expense	1.7	$ 1.7
Senior Notes | 3.250% Convertible Senior Notes due March 2028 (2028 Convertible Notes)
Debt Instrument [Line Items]
Long-term debt	$ 320		$ 320
Stated interest rate	3.25%

Long-term Debt - Narrative (Det

Long-term Debt - Narrative (Details)				3 Months Ended
	Feb. 21, 2024 $ / shares	Jan. 18, 2024 USD ($)	Feb. 03, 2023	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($) $ / shares	Dec. 31, 2023 USD ($)	Mar. 01, 2022 USD ($)
Debt Instrument [Line Items]
Interest expense				$ 14,700,000	$ 18,400,000
Net loss on early debt extinguishment				0	6,800,000
Finance lease obligations				25,300,000			$ 22,300,000
Interest Paid, Capitalized, Investing Activities				11,500,000	$ 19,100,000
2024 Credit Agreement Availability				221,000,000
Letter of Credit
Debt Instrument [Line Items]
Debt instrument, fronting fee		0.125%
Letters of credit outstanding, amount				99,000,000
Line of Credit Facility, Commitment Fee Percentage		0.50%	0.50%
Revolving credit facility
Debt Instrument [Line Items]
Debt issuance cost		$ 9,700,000
Line of credit facility, maximum borrowing capacity		$ 320,000,000
Maximum
Debt Instrument [Line Items]
Basis spread on variable rate		3.25%
Maximum | Letter of Credit
Debt Instrument [Line Items]
Basis spread on variable rate		4.25%
Maximum | Revolving credit facility
Debt Instrument [Line Items]
Basis spread on variable rate		4.25%
Minimum
Debt Instrument [Line Items]
Basis spread on variable rate		2.50%
Minimum | Letter of Credit
Debt Instrument [Line Items]
Basis spread on variable rate		3.50%
Minimum | Revolving credit facility
Debt Instrument [Line Items]
Basis spread on variable rate		3.50%
3.250% Convertible Senior Notes due March 2028 (2028 Convertible Notes)
Debt Instrument [Line Items]
Debt Instrument, Convertible, If-converted Value in Excess of Principal				$ 76,300,000
Senior Notes | 3.250% Convertible Senior Notes due March 2028 (2028 Convertible Notes)
Debt Instrument [Line Items]
Stated interest rate				3.25%
Long-term debt				$ 320,000,000			$ 320,000,000
Principal amount								$ 320,000,000
Debt Issuance Costs, Gross						$ 11,200,000
Debt Conversion, Converted Instrument, Rate				1%
Debt Instrument, Convertible, Conversion Ratio						50.3816
Debt Instrument, Convertible, Revised Conversion Ratio	51.0440
Debt Instrument, Convertible, Conversion Price | $ / shares	$ 19.59					$ 19.85
Debt Instrument, Principle Amount				$ 1,000

Pension and Postretirement Be_3

Pension and Postretirement Benefit Costs - Schedule of Net Periodic Benefit (Benefit) Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Net periodic pension cost	$ (10.1)	$ (9.7)
Defined benefit pension plans
Defined Benefit Plan Disclosure [Line Items]
Interest cost on projected benefit obligation	1.6	7.4
Expected return on plan assets	(1.2)	(6.6)
Net periodic pension cost	0.4	0.8
Postretirement benefit plans
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	0.1	0.1
Interest cost on projected benefit obligation	2.3	2.5
Expected return on plan assets	(0.1)	(0.1)
Amortization of prior service credit	(13.2)	(13.4)
Net periodic pension cost	$ (10.9)	$ (10.9)

Earnings per Share (EPS) - Narr

Earnings per Share (EPS) - Narrative (Details) - shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Earnings Per Share [Abstract]
Antidilutive shares excluded from EPS calculation (in shares)	100,000	100,000

Earnings per Share (EPS) - Calc

Earnings per Share (EPS) - Calculation of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Basic EPS numerator:
Income from continuing operations, net of income taxes	$ 45.7	$ 284.1
Less: Net income attributable to noncontrolling interests	5.4	14.3
Income from continuing operations attributable to common stockholders	40.3	269.8
Loss from discontinued operations, net of income taxes	(0.7)	(1.3)
Net income attributable to common stockholders	39.6	268.5
Diluted EPS numerator:
Income from continuing operations, net of income taxes	45.7	284.1
Interest on Convertible Debt, Net of Tax	(3.1)	(2.6)
Less: Net income attributable to noncontrolling interests	5.4	14.3
Net Income (Loss) from Continuing Operations Available to Common Shareholders, Diluted	43.4	272.4
Loss from discontinued operations, net of income taxes	(0.7)	(1.3)
Net Income (Loss) Available to Common Stockholders, Diluted	$ 42.7	$ 271.1
EPS denominator:
Weighted average shares outstanding — basic	128,100,000	144,600,000
Dilutive impact of share-based compensation awards	600,000	700,000
Dilutive impact of 2028 Convertible Notes	16,200,000	16,100,000
Weighted average shares outstanding — diluted	144,900,000	161,400,000
Basic EPS attributable to common stockholders:
Basic income per share	$ 0.32	$ 1.87
Loss from discontinued operations	(0.01)	(0.01)
Net income attribute to common stockholders per share	0.31	1.86
Diluted EPS attributable to common stockholders:
Income from continuing operations	0.30	1.69
Loss from discontinued operations	(0.01)	(0.01)
Net income attribute to common stockholders per share	$ 0.29	$ 1.68
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive impact of 2028 Convertible Notes	16,200,000	16,100,000
Impact of dilutive securities (in shares)	16,200,000	16,100,000

Financial Instruments and Oth_2

Financial Instruments and Other Guarantees (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Guarantee Obligations [Line Items]
Restricted Cash	$ 710.6	$ 680.9
Deposits Assets	125.4	276.7
Restricted cash and collateral	836	957.6
Surety Trust Account
Guarantee Obligations [Line Items]
Restricted Cash	413.5	444	$ 566.3
Deposits with Regulatory Authorities
Guarantee Obligations [Line Items]
Deposits Assets	125.4	276.7
Cash backed bank guarantees
Guarantee Obligations [Line Items]
Restricted Cash	297.1	$ 236.9
Asset Retirement Obligations
Guarantee Obligations [Line Items]
Surety bonds amount	962.1
Letters of credit outstanding, amount	53.6
Surety Bonds and Letters of Credit Outstanding for Reclamation Support	1,015.7
Less: Letters of Credit in Support of Surety Bonds	53.6
Total Obligations Supported, Net	962.1
Asset Retirement and Other Obligations
Guarantee Obligations [Line Items]
Surety bonds amount	1,070.3
Letters of credit outstanding, amount	152.1
Total Obligations Supported, Net	1,154.4
Total Surety Bonds and Letters of Credit Outstanding	1,222.4
Total Letters of Credit in Support of Surety Bonds	(68)
Other Obligations
Guarantee Obligations [Line Items]
Surety bonds amount	108.2
Letters of credit outstanding, amount	98.5
Less: Letters of Credit in Support of Surety Bonds	14.4
Total Obligations Supported, Net	192.3
Surety Bonds and Letters of Credit Outstanding for Other Support	206.7
Secured debt | Accounts Receivable Securitization Program
Guarantee Obligations [Line Items]
Letters of credit outstanding, amount	53.1
Letter of Credit
Guarantee Obligations [Line Items]
Letters of credit outstanding, amount	99
Collateralized Letter of Credit Agreement
Guarantee Obligations [Line Items]
Letters of credit outstanding, amount	$ 116.6

Financial Instruments and Oth_3

Financial Instruments and Other Guarantees - Narratives (Details) - USD ($) $ in Millions			3 Months Ended
	Jan. 18, 2024	Feb. 03, 2023	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Apr. 14, 2023	Feb. 13, 2023
Guarantee Obligations [Line Items]
Line of Credit Facility, Current Borrowing Capacity						$ 237.2
Net loss on early debt extinguishment			$ 0	$ 6.8
Interest expense			14.7	18.4
Restricted Cash			710.6		$ 680.9
Difference between penal sum of all surety bonds and amount of collateral posted in favor of surety providers			521.8
Capitalized debt issuance costs related to bank guarantees			1.1
Cash-backed bank guarantee facilities			177
Letter of Credit
Guarantee Obligations [Line Items]
Letters of credit outstanding, amount			99
Proceeds from Issuance of Debt		$ 324
Line of Credit Facility, Increase (Decrease), Net		$ (65)
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		6%
Line of Credit Facility, Commitment Fee Percentage	0.50%	0.50%
Collateralized Letter of Credit Agreement
Guarantee Obligations [Line Items]
Letters of credit outstanding, amount			116.6
Line of credit facility, maximum borrowing capacity			$ 250
Cash Collateral, Percentage of the aggregate amount of letters of credit outstanding			103%
Cash-collateralized Letters of Credit			$ 120.1
Stated interest rate			0.75%
Surety Trust Account
Guarantee Obligations [Line Items]
Restricted Cash			$ 413.5	566.3	$ 444
Accounts Receivable Securitization Program
Guarantee Obligations [Line Items]
Line of Credit Facility, Previous Maximum Borrowing Capacity							$ 175
Line of credit facility, maximum borrowing capacity							$ 225
Accounts Receivable Securitization Program | Secured debt
Guarantee Obligations [Line Items]
Letters of credit outstanding, amount			$ 53.1
Basis spread on variable rate			2.10%
Maximum
Guarantee Obligations [Line Items]
Debt Instrument, Collateral Amount						$ 721.8
Basis spread on variable rate	3.25%
Maximum | Letter of Credit
Guarantee Obligations [Line Items]
Basis spread on variable rate	4.25%
Maximum | Collateralized Letter of Credit Agreement
Guarantee Obligations [Line Items]
Transaction support agreements, additional collateral demands			$ 5
Minimum
Guarantee Obligations [Line Items]
Basis spread on variable rate	2.50%
Minimum | Letter of Credit
Guarantee Obligations [Line Items]
Basis spread on variable rate	3.50%
Surety Bond
Guarantee Obligations [Line Items]
Debt Instrument, Transaction Support Agreements, Additional Collateral Posted				140.5
Debt Instrument, Transaction Support Agreement, Additional Collateral Held				15
Surety Agreement Liquidity Covenant, Amount			$ 400
Surety Bond | Maximum
Guarantee Obligations [Line Items]
Net Leverage Ratio			1.5
Surety Bond | Minimum
Guarantee Obligations [Line Items]
Net Leverage Ratio			1
Senior Notes | 3.250% Convertible Senior Notes due March 2028 (2028 Convertible Notes)
Guarantee Obligations [Line Items]
Debt Instrument, Funded, Percent			50%
Stated interest rate			3.25%
Secured debt | Accounts Receivable Securitization Program
Guarantee Obligations [Line Items]
Outstanding borrowings			$ 0
Accounts Receivable from Securitization			80.7
Interest expense			$ 0.8	$ 1

Commitments and Contingencies (

Commitments and Contingencies (Details) - Capital Addition Purchase Commitments $ in Millions	Mar. 31, 2024 USD ($)
Long-term Purchase Commitment [Line Items]
Unrecorded unconditional purchase obligation (within next five years)	$ 100
Unrecorded unconditional purchase obligation (within next 12 months)	$ 92.9

Segment Information - Segment R

Segment Information - Segment Results (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Reportable segment results
Revenues	$ 983.6	$ 1,364
Adjusted EBITDA	160.5	390.6
Seaborne Thermal
Reportable segment results
Revenues	283.9	346.5
Adjusted EBITDA	93.8	164
Seaborne Metallurgical
Reportable segment results
Revenues	247	288.4
Adjusted EBITDA	48.3	90.8
Powder River Basin
Reportable segment results
Revenues	254.1	305.3
Adjusted EBITDA	16.4	35.8
Other U.S. Thermal
Reportable segment results
Revenues	191.6	249.4
Adjusted EBITDA	46.5	64.2
Corporate and Other (1)
Reportable segment results
Revenues	7	174.4
Adjusted EBITDA	$ (44.5)	$ 35.8

Segment Information - Reconcili

Segment Information - Reconciliation to Adjusted EBITDA (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Income from continuing operations, net of income taxes	$ 45.7	$ 284.1
Depreciation, depletion and amortization	79.8	76.3
Asset retirement obligation expenses	12.9	15.4
Restructuring charges	0.1	0.1
Asset impairment	0	2
Provision for NARM loss	1.8	0
Changes in amortization of basis difference related to equity affiliates	(0.4)	(0.3)
Interest expense	14.7	18.4
Net loss on early debt extinguishment	0	6.8
Interest income	(19.2)	(13.1)
Unrealized gains on derivative contracts related to forecasted sales	0	(118.7)
Unrealized losses on foreign currency option contracts	5.7	2.2
Take-or-pay contract-based intangible recognition	(0.7)	(0.6)
Income tax provision	20.1	118
Adjusted EBITDA	$ 160.5	$ 390.6

Other Events Narrative (Details

Other Events Narrative (Details) $ in Millions		3 Months Ended
	Apr. 16, 2024 USD ($)	Mar. 31, 2024 USD ($) shares	Dec. 31, 2023 USD ($)	Mar. 31, 2023 USD ($)	Mar. 31, 2023 AUD ($)
Other Commercial Events [Line Items]
Revenues		$ 983,600,000		$ 1,364,000,000
Other Noncash Income		9,800,000
Revenue from Collaborative Arrangement, Excluding Revenue from Contract with Customer					$ 30
Revenue related to excess port and rail capacity agreement		19,200,000
Common stock repurchase amount including commission fees		80,500,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 569,600,000
Stock Repurchased During Period, Shares | shares		3,200,000
Subsequent Event | Wards Well coal deposit
Other Commercial Events [Line Items]
Asset Acquisition, Price of Acquisition, Expected	$ 134,000,000
Contingent royalty	$ 200,000,000
Treasury Stock, Common
Other Commercial Events [Line Items]
Sales and Excise Tax Payable		$ 700,000		0
Unsettled common stock repurchases		(2,600,000)		$ 0
Accrued excise taxes related to common stock repurchases		4,000,000
North Antelope Rochelle Mine
Other Commercial Events [Line Items]
Storm Damage Provision		$ 1,800,000
Shoal Creek Mine
Other Commercial Events [Line Items]
Business interruption and property loss limits on insurance claim, amount			$ 125,000,000
Deductible amount			$ 50,000,000