Peabody Energy (BTU) 10-Q 3 Nov 23 2023 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares shares in Millions	9 Months Ended
	Sep. 30, 2023	Oct. 27, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2023
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		131.1
Entity Central Index Key	0001064728
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Amendment Flag	false

UNAUDITED CONDENSED CONSOLIDATE

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Revenues	$ (1,078.9)	$ (1,342.5)	$ (3,711.7)	$ (3,355.8)
Costs and expenses
Operating costs and expenses (exclusive of items shown separately below)	803.7	838.4	2,512.3	2,363
Depreciation, depletion and amortization	82.3	80.7	239.2	227.4
Asset retirement obligation expenses	15.4	13.1	46.3	40.8
Selling and administrative expenses	21.5	19.6	66	64.5
Restructuring charges	0.9	1	3	2.8
Other operating (income) loss:
Net gain on disposals	(1.4)	(5)	(8.5)	(22.7)
Asset impairment	0	1.7	2	1.7
Provision for NARM and Shoal Creek loss	3.3	0	37	0
Income from equity affiliates	(5.6)	(27.5)	(9.7)	(120.9)
Operating profit	158.8	420.5	824.1	799.2
Interest expense	13.8	33.8	45.5	110.8
Net loss on early debt extinguishment	0	8.7	8.8	34.5
Interest income	(20.3)	(4.9)	(56.5)	(6.3)
Net periodic benefit credit, excluding service cost	(10)	(12.2)	(29.4)	(36.7)
Income from continuing operations before income taxes	175.3	395.1	855.7	696.9
Income tax provision	46.5	10.7	238.7	21
Income from continuing operations, net of income taxes	128.8	384.4	617	675.9
Income (loss) from discontinued operations, net of income taxes	2.5	(0.8)	(0.1)	(2.3)
Net income	131.3	383.6	616.9	673.6
Less: Net income attributable to noncontrolling interests	11.4	8.5	49.3	8.5
Net income attributable to common stockholders	$ 119.9	$ 375.1	$ 567.6	$ 665.1
Income from continuing operations:
Basic income per share	$ 0.88	$ 2.61	$ 4.06	$ 4.72
Diluted income per share	0.80	2.34	3.68	4.33
Net income attributable to common stockholders:
Basic income per share	0.90	2.60	4.05	4.70
Diluted income per share	$ 0.82	$ 2.33	$ 3.68	$ 4.31

UNAUDITED CONDENSED CONSOLIDA_2

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 131.3	$ 383.6	$ 616.9	$ 673.6
Postretirement plans (net of $0.0 tax provisions in each period)	(13.5)	(13.4)	(40.3)	(40.3)
Foreign currency translation adjustment	(1)	0.1	(1.6)	(1.4)
Other comprehensive loss, net of income taxes	(14.5)	(13.3)	(41.9)	(41.7)
Comprehensive income	116.8	370.3	575	631.9
Less: Net income attributable to noncontrolling interests	11.4	8.5	49.3	8.5
Comprehensive income attributable to common stockholders	$ 105.4	$ 361.8	$ 525.7	$ 623.4

UNAUDITED CONDENSED CONSOLIDA_3

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	$ 0	$ 0	$ 0	$ 0

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Current assets
Cash and cash equivalents	$ 988.5	$ 1,307.3
Accounts receivable, net of allowance for credit losses of $0.0 at September 30, 2023 and December 31, 2022	348.4	465.5
Inventories, net	352	296.1
Other current assets	244.1	303.6
Total current assets	1,933	2,372.5
Property, plant, equipment and mine development, net	2,805.5	2,865
Operating lease right-of-use assets	36	26.9
Restricted cash and collateral	866.1	187.4
Investments and other assets	79.1	84.3
Deferred income taxes	2.5	74.7
Total assets	5,722.2	5,610.8
Current liabilities
Current portion of long-term debt	12.7	13.2
Accounts payable and accrued expenses	826.8	905.5
Total current liabilities	839.5	918.7
Long-term debt, less current portion	320.9	320.6
Deferred income taxes	20	20.4
Asset retirement obligations	669.7	665.8
Accrued postretirement benefit costs	150.6	156.5
Operating lease liabilities, less current portion	21.6	11
Other noncurrent liabilities	187.4	223
Total liabilities	2,209.7	2,316
Stockholders’ equity
Preferred Stock — $0.01 per share par value; 100.0 shares authorized, no shares issued or outstanding as of September 30, 2023 and December 31, 2022	0	0
Series Common Stock — $0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of September 30, 2023 and December 31, 2022	0	0
Common Stock — $0.01 per share par value; 450.0 shares authorized, 188.6 shares issued and 132.2 shares outstanding as of September 30, 2023 and 187.1 shares issued and 143.9 shares outstanding as of December 31, 2022	1.9	1.9
Additional paid-in capital	3,981.2	3,975.9
Treasury stock, at cost — 56.4 and 43.2 common shares as of September 30, 2023 and December 31, 2022	(1,655.7)	(1,372.9)
Retained earnings	930.6	383.9
Accumulated other comprehensive income	200.6	242.5
Peabody Energy Corporation stockholders’ equity	3,458.6	3,231.3
Noncontrolling interests	53.9	63.5
Total stockholders’ equity	3,512.5	3,294.8
Total liabilities and stockholders’ equity	$ 5,722.2	$ 5,610.8
Treasury stock, shares (in shares)	56,400,000	43,200,000
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)	188,600,000	187,100,000
Common stock, shares outstanding (in shares)	132,200,000	143,900,000

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
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)	188,600,000	187,100,000
Common stock, shares outstanding (in shares)	132,200,000	143,900,000

UNAUDITED CONDENSED CONSOLIDA_4

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)
Cash Flows From Operating Activities
Net income	$ 616.9	$ 673.6
Loss from discontinued operations, net of income taxes	0.1	2.3
Income from continuing operations, net of income taxes	617	675.9
Adjustments to reconcile income from continuing operations, net of income taxes to net cash provided by operating activities:
Depreciation, depletion and amortization	239.2	227.4
Noncash interest expense, net	4	13.6
Deferred income taxes	71.8	(2.8)
Noncash share-based compensation	5.1	6.6
Asset impairment	2	1.7
Noncash provision for NARM and Shoal Creek loss	33.7	0
Net gain on disposals	(8.5)	(22.7)
Noncash income from port and rail capacity assignment	(9.4)	0
Net loss on early debt extinguishment	8.8	34.5
Income from equity affiliates	(9.7)	(120.9)
Foreign currency option contracts	(0.1)	4.4
Changes in current assets and liabilities:
Accounts receivable	126.6	(75.9)
Inventories	(59.9)	(50.7)
Other current assets	30.1	(40.6)
Accounts payable and accrued expenses	(29.2)	(61.6)
Collateral arrangements	(145.9)	(36.8)
Asset retirement obligations	3.9	6
Workers’ compensation obligations	(1.3)	(2.5)
Postretirement benefit obligations	(46.3)	(48.5)
Pension obligations	0.9	(1.7)
Other, net	(0.1)	3.5
Net cash provided by continuing operations	832.7	508.9
Net cash used in discontinued operations	(79.6)	(4.8)
Net cash provided by operating activities	753.1	504.1
Cash Flows From Investing Activities
Additions to property, plant, equipment and mine development	(190.4)	(104.5)
Changes in accrued expenses related to capital expenditures	(5.1)	(8.3)
Proceeds from disposal of assets, net of receivables	13.9	30.6
Contributions to joint ventures	(573.4)	(475.1)
Distributions from joint ventures	579.4	465.2
Advances to related parties	(0.1)	(1.3)
Cash receipts from Middlemount Coal Pty Ltd and other related parties	2.6	154.9
Other, net	(1.5)	(0.4)
Net cash (used in) provided by investing activities	(174.6)	61.1
Cash Flows From Financing Activities
Proceeds from long-term debt	0	545
Repayments of long-term debt	(6.9)	(846.3)
Payment of debt issuance and other deferred financing costs	(0.3)	(21.1)
Proceeds from Issuance of Common Stock	0	222
Common stock repurchases	(264)	0
Repurchase of employee common stock relinquished for tax withholding	(13.7)	(2.6)
Dividends paid	(20.7)	0
Distributions to noncontrolling interests	(58.9)	(17.5)
Net cash used in financing activities	(364.5)	(120.5)
Net change in cash, cash equivalents and restricted cash	214	444.7
Cash, cash equivalents and restricted cash at beginning of period (1)	1,417.6	954.3
Cash, cash equivalents and restricted cash at end of period (2)	1,631.6	$ 1,399
Cash and cash equivalents	988.5
Restricted Cash	$ 643.1

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 deficit)	Accumulated other comprehensive income	Noncontrolling interests	Treasury Stock, Common
Balance, beginning of period at Dec. 31, 2021		$ 1.8	$ 3,745.6	$ (913.2)	$ 297.9	$ 59	$ (1,370.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation for equity-classified awards			6.6
Common stock issuances, net of costs			221.9
Net income	$ 673.6			665.1		8.5
Dividends declared ($0.075, $0.000, $0.150, and $0.000 per share, respectively)				0
Repurchase of employee common stock relinquished for tax withholding	(2.6)						(2.6)
Postretirement plans (net of $0.0 tax provisions in each period)	(40.3)				(40.3)
Foreign currency translation adjustment	(1.4)				(1.4)
Distributions to noncontrolling interests						(17.5)
Common stock issuances, net of costs		0.1
Balance, end of period at Sep. 30, 2022	2,661.2	1.9	3,974.1	(248.1)	256.2	50	(1,372.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock repurchases	0						0
Unsettled common stock repurchases							0
Dividend equivalent units on dividends declared			0
Sales and Excise Tax Payable							0
Balance, beginning of period at Jun. 30, 2022		1.9	3,972.9	(623.2)	269.5	45.2	(1,372.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation for equity-classified awards			1.2
Common stock issuances, net of costs			0
Net income	383.6			375.1		8.5
Dividends declared ($0.075, $0.000, $0.150, and $0.000 per share, respectively)				0
Repurchase of employee common stock relinquished for tax withholding							0
Postretirement plans (net of $0.0 tax provisions in each period)	(13.4)				(13.4)
Foreign currency translation adjustment	0.1				0.1
Distributions to noncontrolling interests						(3.7)
Common stock issuances, net of costs		0
Balance, end of period at Sep. 30, 2022	2,661.2	1.9	3,974.1	(248.1)	256.2	50	(1,372.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock repurchases							0
Unsettled common stock repurchases							0
Dividend equivalent units on dividends declared			0
Sales and Excise Tax Payable							0
Balance, beginning of period at Dec. 31, 2022	3,294.8	1.9	3,975.9	383.9	242.5	63.5	(1,372.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation for equity-classified awards			5.1
Common stock issuances, net of costs			0
Net income	616.9			567.6		49.3
Dividends declared ($0.075, $0.000, $0.150, and $0.000 per share, respectively)				(20.9)
Repurchase of employee common stock relinquished for tax withholding	(13.7)						(13.7)
Postretirement plans (net of $0.0 tax provisions in each period)	(40.3)				(40.3)
Foreign currency translation adjustment	(1.6)				(1.6)
Distributions to noncontrolling interests						(58.9)
Common stock issuances, net of costs		0
Balance, end of period at Sep. 30, 2023	3,512.5	1.9	3,981.2	930.6	200.6	53.9	(1,655.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock repurchases	264						(264)
Unsettled common stock repurchases							(2.6)
Dividend equivalent units on dividends declared			0.2
Sales and Excise Tax Payable							(2.5)
Balance, beginning of period at Jun. 30, 2023		1.9	3,979.4	820.7	215.1	78.6	(1,572.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation for equity-classified awards			1.7
Common stock issuances, net of costs			0
Net income	131.3			119.9		11.4
Dividends declared ($0.075, $0.000, $0.150, and $0.000 per share, respectively)				(10)
Repurchase of employee common stock relinquished for tax withholding							0
Postretirement plans (net of $0.0 tax provisions in each period)	(13.5)				(13.5)
Foreign currency translation adjustment	(1)				(1)
Distributions to noncontrolling interests						(36.1)
Common stock issuances, net of costs		0
Balance, end of period at Sep. 30, 2023	$ 3,512.5	$ 1.9	3,981.2	$ 930.6	$ 200.6	$ 53.9	(1,655.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock repurchases							(91)
Unsettled common stock repurchases							8.6
Dividend equivalent units on dividends declared			$ 0.1
Sales and Excise Tax Payable							$ (0.9)

UNAUDITED CONDENSED CONSOLIDA_6

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY (Parenthetical) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	$ 0	$ 0	$ 0	$ 0
Retained earnings (Accumulated deficit)
Dividends declared per share	$ 0.075	$ 0	$ 0.150	$ 0
Accumulated other comprehensive income
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	$ 0	$ 0	$ 0	$ 0

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The 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, 2022. 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, 2022 has been derived from the Company’s audited consolidated balance sheet at that date. The Company’s results of operations for the three and nine months ended September 30, 2023 are not necessarily indicative of the results that may be expected for future quarters or for the year ending December 31, 2023.

Accounting Policies

Accounting Policies	9 Months Ended
	Sep. 30, 2023
Accounting Policies [Abstract]
Newly Adopted Accounting Standards and Accounting Standards Not Yet Implemented	Newly Adopted Accounting Standards and Accounting Standards Not Yet Implemented Accounting Standards Not Yet Implemented Joint Ventures. In August 2023, Accounting Standards Update 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 does not expect the guidance to have a material impact on its consolidated financial statements or disclosures.

Revenue Recognition

Revenue Recognition	9 Months Ended
	Sep. 30, 2023
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, 2022, 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 September 30, 2023 Seaborne Thermal Seaborne Metallurgical Powder River Basin Other U.S. Thermal Corporate and Other (1) Consolidated (Dollars in millions) Thermal coal Domestic $ 31.3 $ — $ 313.3 $ 227.1 $ — $ 571.7 Export 265.9 — — — — 265.9 Total thermal 297.2 — 313.3 227.1 — 837.6 Metallurgical coal Export — 246.0 — — — 246.0 Total metallurgical — 246.0 — — — 246.0 Other (2) 0.2 1.0 (0.3) 1.1 (6.7) (4.7) Revenue $ 297.4 $ 247.0 $ 313.0 $ 228.2 $ (6.7) $ 1,078.9 Three Months Ended September 30, 2022 Seaborne Thermal Seaborne Metallurgical Powder River Basin Other U.S. Thermal Corporate and Other (1) Consolidated (Dollars in millions) Thermal coal Domestic $ 44.8 $ — $ 290.2 $ 259.8 $ — $ 594.8 Export 308.3 — — — — 308.3 Total thermal 353.1 — 290.2 259.8 — 903.1 Metallurgical coal Export — 309.9 — — — 309.9 Total metallurgical — 309.9 — — — 309.9 Other (2) 0.1 0.8 0.3 1.6 126.7 129.5 Revenue $ 353.2 $ 310.7 $ 290.5 $ 261.4 $ 126.7 $ 1,342.5 Nine Months Ended September 30, 2023 Seaborne Thermal Seaborne Metallurgical Powder River Basin Other U.S. Thermal Corporate and Other (1) Consolidated (Dollars in millions) Thermal coal Domestic $ 100.7 $ — $ 878.1 $ 673.2 $ — $ 1,652.0 Export 942.2 — — — — 942.2 Total thermal 1,042.9 — 878.1 673.2 — 2,594.2 Metallurgical coal Export — 904.8 — — — 904.8 Total metallurgical — 904.8 — — — 904.8 Other (2) 0.5 3.1 (0.1) 4.3 204.9 212.7 Revenue $ 1,043.4 $ 907.9 $ 878.0 $ 677.5 $ 204.9 $ 3,711.7 Nine Months Ended September 30, 2022 Seaborne Thermal Seaborne Metallurgical Powder River Basin Other U.S. Thermal Corporate and Other (1) Consolidated (Dollars in millions) Thermal coal Domestic $ 125.0 $ — $ 771.6 $ 682.5 $ — $ 1,579.1 Export 833.7 — — 1.0 — 834.7 Total thermal 958.7 — 771.6 683.5 — 2,413.8 Metallurgical coal Export — 1,161.2 — — — 1,161.2 Total metallurgical — 1,161.2 — — — 1,161.2 Other (2) 0.6 4.6 (0.2) 5.9 (230.1) (219.2) Revenue $ 959.3 $ 1,165.8 $ 771.4 $ 689.4 $ (230.1) $ 3,355.8 (1) Corporate and Other includes the following: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (Dollars in millions) Unrealized gains (losses) on derivative contracts related to forecasted sales $ — $ 90.4 $ 159.0 $ (235.1) Realized losses on derivative contracts related to forecasted sales — (117.4) (80.9) (308.0) Revenue from physical sale of coal (3) (10.4) 150.7 97.4 294.0 Trading revenue (0.1) 0.3 — 10.7 Other (2) 3.8 2.7 29.4 8.3 Total Corporate and Other $ (6.7) $ 126.7 $ 204.9 $ (230.1) (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 September 30, 2023 and December 31, 2022 consisted of the following: September 30, 2023 December 31, 2022 (Dollars in millions) Trade receivables, net $ 294.1 $ 416.3 Miscellaneous receivables, net 54.3 49.2 Accounts receivable, net $ 348.4 $ 465.5 None of the above receivables included allowances for credit losses at September 30, 2023 or December 31, 2022. No charges for credit losses were recognized during the three and nine months ended September 30, 2023 or 2022.

Inventories

Inventories	9 Months Ended
	Sep. 30, 2023
Inventory Disclosure [Abstract]
Inventories	Inventories “Inventories, net” as of September 30, 2023 and December 31, 2022 consisted of the following: September 30, 2023 December 31, 2022 (Dollars in millions) Materials and supplies, net $ 155.7 $ 130.8 Raw coal 105.8 98.3 Saleable coal 90.5 67.0 Inventories, net $ 352.0 $ 296.1

Equity Method Investments

Equity Method Investments	9 Months Ended
	Sep. 30, 2023
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 “Income from equity affiliates”: (Income) Loss from Equity Affiliates Book Value at Three Months Ended September 30, Nine Months Ended September 30, September 30, 2023 December 31, 2022 2023 2022 2023 2022 (Dollars in millions) Equity method investment related to Middlemount $ 40.2 $ 27.1 $ (8.2) $ (28.4) $ (14.9) $ (123.6) Equity method investment related to R3 7.3 7.0 2.6 0.9 5.2 2.7 Total equity method investments $ 47.5 $ 34.1 $ (5.6) $ (27.5) $ (9.7) $ (120.9) The Company received no cash payments from Middlemount during the nine months ended September 30, 2023. Payments of $151.5 million were received from Middlemount during the nine months ended September 30, 2022. One of the Company’s Australian subsidiaries is party to an agreement to provide a revolving loan to Middlemount. The Company’s participation in the revolving loan will not, at any time, exceed its 50% equity interest of the revolving loan limit, which was $50 million Australian dollars at September 30, 2023. The revolving loan bears interest at 10% per annum and expires on December 31, 2023. There was no outstanding revolving loan at September 30, 2023 or December 31, 2022. 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 $5.5 million and $10.9 million to R3 during the nine months ended September 30, 2023 and 2022, respectively.

Derivatives and Fair Value Meas

Derivatives and Fair Value Measurements	9 Months Ended
	Sep. 30, 2023
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, (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, (3) price risk and the variability of cash flows related to forecasted diesel fuel purchased for use in its operations and (4) interest rate risk on long-term debt. 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. The Company had no diesel fuel or interest rate derivatives in place as of September 30, 2023. Foreign Currency Option Contracts The Company has historically utilized currency forwards and options to hedge currency risk associated with anticipated Australian dollar operating expenditures. As of September 30, 2023, the Company held average rate options with an aggregate notional amount of $615.0 million Australian dollars to hedge currency risk associated with anticipated Australian dollar operating expenditures over the nine-month period ending June 30, 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 $0.70 to $0.72 over the nine-month period ending June 30, 2024. As of September 30, 2023, the Company also held purchased collars with an aggregate notional amount of $339.0 million Australian dollars related to anticipated Australian dollar operating expenditures during the six-month period ending March 31, 2024. The purchased collars have a floor and ceiling of approximately $0.60 and $0.75, 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 September 30, 2023, the Company had no coal derivative contracts related to its forecasted sales. Historically, such financial contracts have included futures, forwards and options. The Company classifies certain physical forward sales contracts as derivatives for which the normal purchase, normal sales exception does not apply. During the three months ended September 30, 2023, the Company recorded no unrealized mark-to-market gains or losses on coal derivative contracts. During the three months ended September 30, 2022, the Company recorded a net unrealized mark-to-market gain of $90.4 million on coal derivative contracts, which included approximately $49 million of unrealized mark-to-market gains on financial derivatives and approximately $41 million of unrealized mark-to-market gains on physical forward sales contracts. During the nine months ended September 30, 2023, the Company recorded a net unrealized mark-to-market gain of $159.0 million on financial coal derivative contracts and no unrealized mark-to-market gains or losses on physical forward sales contracts. During the nine months ended September 30, 2022, the Company recorded a net unrealized mark-to-market loss of $235.1 million on coal derivative contracts, which included approximately $257 million of unrealized mark-to-market losses on financial derivatives and approximately $22 million of unrealized mark-to-market gains on physical forward sales contracts. 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 September 30, 2023. 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. The fair value of derivatives reflected in the accompanying condensed consolidated balance sheets are set forth in the table below. September 30, 2023 December 31, 2022 Asset Derivative Liability Derivative Asset Derivative Liability Derivative (Dollars in millions) Foreign currency option contracts $ 0.1 $ — $ 3.0 $ — Derivative contracts related to forecasted sales — — 100.6 (310.3) Financial trading contracts — — 11.7 — Total derivatives 0.1 — 115.3 (310.3) Effect of counterparty netting — — (100.6) 100.6 Variation margin (received) posted — — (11.7) 209.7 Net derivatives and variation margin as classified in the balance sheets $ 0.1 $ — $ 3.0 $ — The Company generally posts or receives variation margin cash with its clearing broker on the majority of its financial derivatives as market values of the financial derivatives fluctuate. As of September 30, 2023, the Company had no margin cash posted. As of December 31, 2022, the Company had posted $255.5 million aggregate margin cash, consisting of $198.0 million variation margin cash and $57.5 million initial margin. The net amount of asset derivatives, net of variation margin, is included in “Other current assets” and the net amount of liability derivatives, net of variation margin, is included in “Accounts payable and accrued expenses” 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 September 30, 2023 Total loss recognized in income Loss 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 $ (2.7) $ (2.2) $ (0.5) Financial trading contracts Revenue (0.1) (19.7) 19.6 Total $ (2.8) $ (21.9) $ 19.1 Three Months Ended September 30, 2022 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 $ (3.0) $ (1.6) $ (1.4) Derivative contracts related to forecasted sales Revenue (27.0) (117.4) 90.4 Financial trading contracts Revenue 0.3 0.5 (0.2) Total $ (29.7) $ (118.5) $ 88.8 Nine Months Ended September 30, 2023 Total (loss) gain recognized in income (Loss) gain realized in income on derivatives Unrealized gain (loss) recognized in income on derivatives Derivative Instrument Classification (Dollars in millions) Foreign currency option contracts Operating costs and expenses $ (7.8) $ (7.9) $ 0.1 Derivative contracts related to forecasted sales Revenue 78.1 (80.9) 159.0 Financial trading contracts Revenue — 11.5 (11.5) Total $ 70.3 $ (77.3) $ 147.6 Nine Months Ended September 30, 2022 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 $ (8.2) $ (3.8) $ (4.4) Derivative contracts related to forecasted sales Revenue (543.1) (308.0) (235.1) Financial trading contracts Revenue 10.7 0.6 10.1 Total $ (540.6) $ (311.2) $ (229.4) 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 (liability) positions for which fair value is measured on a recurring basis. Variation margin cash associated with the derivative balances is excluded from this table. September 30, 2023 Level 1 Level 2 Level 3 Total (Dollars in millions) Foreign currency option contracts $ — $ 0.1 $ — $ 0.1 Derivative contracts related to forecasted sales — — — — Financial trading contracts — — — — Equity securities 0.2 — — 0.2 Total net assets $ 0.2 $ 0.1 $ — $ 0.3 December 31, 2022 Level 1 Level 2 Level 3 Total (Dollars in millions) Foreign currency option contracts $ — $ 3.0 $ — $ 3.0 Derivative contracts related to forecasted sales — (209.7) — (209.7) Financial trading contracts — 11.7 — 11.7 Equity securities — — 2.5 2.5 Total net (liabilities) assets $ — $ (195.0) $ 2.5 $ (192.5) 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 September 30, 2023 and December 31, 2022: • 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- and variable-rate long-term debt relates to the potential reduction in the fair value and negative impact to future earnings, respectively, 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. September 30, 2023 December 31, 2022 (Dollars in millions) Total debt at par value $ 342.1 $ 343.6 Less: Unamortized debt issuance costs (8.5) (9.8) Net carrying amount $ 333.6 $ 333.8 Estimated fair value $ 506.2 $ 560.0 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 nine months ended September 30, 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 and nine months ended September 30, 2023 and 2022. 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	9 Months Ended
	Sep. 30, 2023
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 September 30, 2023 and December 31, 2022 is set forth in the table below: September 30, 2023 December 31, 2022 (Dollars in millions) Land and coal interests $ 2,511.9 $ 2,514.7 Buildings and improvements 633.5 594.2 Machinery and equipment 1,671.0 1,543.1 Less: Accumulated depreciation, depletion and amortization (2,010.9) (1,787.0) Property, plant, equipment and mine development, net $ 2,805.5 $ 2,865.0 Asset Impairment and Other At-Risk Assets The Company identified certain assets with an aggregate carrying value of approximately $388 million at September 30, 2023 in its Powder River Basin and Other U.S. Thermal segments whose recoverability is most sensitive to customer demand and customer concentration risk. The Company conducted a review of those assets as of September 30, 2023 and determined that no impairment charges were necessary as of that date.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	Income Taxes The Company's effective tax rate before remeasurement for the nine months ended September 30, 2023 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 $46.5 million and $10.7 million for the three months ended September 30, 2023 and 2022, respectively, included tax benefits of $3.3 million and $1.6 million, respectively, related to the remeasurement of foreign income tax accounts. The Company’s income tax provisions of $238.7 million and $21.0 million for the nine months ended September 30, 2023 and 2022, respectively, included tax benefits of $2.6 million and $3.5 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	9 Months Ended
	Sep. 30, 2023
Debt Disclosure [Abstract]
Long-term Debt	Long-term Debt The Company’s total indebtedness as of September 30, 2023 and December 31, 2022 consisted of the following: Debt Instrument (defined below, as applicable) September 30, 2023 December 31, 2022 (Dollars in millions) 3.250% Convertible Senior Notes due March 2028 (2028 Convertible Notes) $ 320.0 $ 320.0 Finance lease obligations 22.1 23.6 Less: Debt issuance costs (8.5) (9.8) 333.6 333.8 Less: Current portion of long-term debt 12.7 13.2 Long-term debt $ 320.9 $ 320.6 During 2022, the Company utilized various methods allowable or required under its then-existing debt agreements to retire all of its senior secured long-term debt, leaving only its unsecured 3.250% Convertible Senior Notes due March 2028 (2028 Convertible Notes), which are further described below, and various finance lease obligations outstanding at December 31, 2022. 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 $62.6 million of senior secured notes maturing in 2024 and $257.4 million of senior secured notes maturing in 2025, 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 and recognized a loss on early debt extinguishment of $23.0 million during the three months ended March 31, 2022. 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 bore interest from March 1, 2022 at a rate of 3.250% per year, payable semi-annually in arrears on March 1 and September 1 of each year, beginning on September 1, 2022. The 2028 Convertible Notes’ indenture requires 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%. Under the applicable conversion rate formula, the $0.150 per share dividends declared and paid during the nine months ended September 30, 2023 yielded a revised conversion rate of 50.7205 shares per $1,000 principal amount of 2028 Convertible Notes, which did not meet the 1% threshold to impact the existing conversion rate of 50.3816. The conversion rate may be impacted prospectively, based upon cumulative dividends paid. During the first three quarters of 2023, 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 were not convertible at the option of the holders during the second or third quarters of 2023, and will not be similarly convertible during the fourth quarter of 2023. As of September 30, 2023, the if-converted value of the 2028 Convertible Notes exceeded the principal amount by $99.0 million. 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 September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (Dollars in millions) Indebtedness $ 4.9 $ 20.8 $ 16.6 $ 70.7 Financial assurance instruments 8.9 13.0 28.9 40.1 Interest expense $ 13.8 $ 33.8 $ 45.5 $ 110.8 Cash paid for interest $ 14.8 $ 26.4 $ 56.7 $ 104.2 Non-cash interest expense $ 0.7 $ 4.6 $ 4.0 $ 13.6 Covenant Compliance The Company was compliant with all relevant covenants under its debt and other finance agreements at September 30, 2023. The April 2023 termination of the Company’s credit agreement and related letter of credit facility, as described in Note 12. “Financial Instruments and Other Guarantees,” eliminated the related compliance requirements as of March 31, 2023 and prospectively.

Pension and Postretirement Bene

Pension and Postretirement Benefit Costs	9 Months Ended
	Sep. 30, 2023
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 (credit) included the following components: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (Dollars in millions) Service cost for benefits earned $ 0.1 $ 0.1 $ 0.1 $ 0.1 Interest cost on projected benefit obligation 3.6 5.3 18.4 16.0 Expected return on plan assets (3.1) (6.0) (16.3) (17.9) Net periodic pension cost (credit) $ 0.6 $ (0.6) $ 2.2 $ (1.8) Annual contributions to the qualified plans 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 (generally 80%). As of September 30, 2023, the Company’s qualified plans were expected to be at or above the Pension Protection Act thresholds. The Company is not required to make any contributions to its qualified pension plans in 2023 based on minimum funding requirements and does not expect to make any discretionary contributions in 2023 at this time. In March 2022, Peabody Investments Corp. (PIC), a wholly-owned subsidiary of PEC, entered into a commitment agreement relating to the Peabody Investments Corp. Retirement Plan (the Peabody Plan) with The Prudential Insurance Company of America (Prudential) and Fiduciary Counselors Inc., as independent fiduciary to the Peabody Plan. Under the commitment agreement, the Peabody Plan purchased a buy-in group annuity contract (GAC) from Prudential for approximately $500 million, which was funded directly by the Peabody Plan’s assets. The benefit obligation was not transferred to Prudential and the Peabody Plan continued to administer and pay the retirement benefits of Peabody Plan participants, but was reimbursed by Prudential for the payment of all benefits covered by the GAC. There was no impact on the monthly retirement benefits paid to Peabody Plan participants and no material impact on contributions for the Peabody Plan in 2022 or 2023 as a result of this transaction. In May 2022, the Board of Directors of PIC approved the termination of the Peabody Plan effective July 31, 2022. In June 2022, the Peabody Plan’s participants were notified of the Peabody Plan termination and PIC filed an application with the Internal Revenue Service to request a determination as to the qualified status under §401(a) of the Internal Revenue Code of 1986 with respect to the amendment and termination of the Peabody Plan. In May 2023, PIC received a favorable determination from the Internal Revenue Service as to the Peabody Plan’s qualified status with respect to its plan termination. In February 2023, as part of the Peabody Plan termination process, PIC announced a program to offer a voluntary lump-sum pension payout to certain active and deferred participants of the Peabody Plan which would fully settle the Peabody Plan’s obligation to them. The program provided participants with a limited-time opportunity to elect to receive a lump-sum settlement of their pension benefit or begin to receive their benefit in the form of a monthly annuity in May 2023. On July 31, 2023, as part of the completion of the standard Employee Retirement Income Security Act plan termination process for the Peabody Plan, the GAC with Prudential was converted from a buy-in group annuity contract to a buy-out group annuity contract, irrevocably transferring the remaining benefit obligation and administration to Prudential. The Peabody Plan no longer administers or pays the retirement benefits of Peabody Plan participants. No cash contributions are expected to be required to complete the termination process for the Peabody Plan. During the nine months ended September 30, 2023, the Company settled $442.0 million of its pension obligations for active and deferred participants in the Peabody Plan with an equal amount paid from plan assets. Any settlement gain or loss related to the termination process will be recorded during the fourth quarter, but the Company does not expect a material impact to its results. Net periodic postretirement benefit credit included the following components: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (Dollars in millions) Service cost for benefits earned $ 0.1 $ 0.2 $ 0.4 $ 0.6 Interest cost on accumulated postretirement benefit obligation 2.6 1.7 7.6 5.2 Expected return on plan assets (0.1) (0.2) (0.4) (0.6) Amortization of prior service credit (13.5) (13.4) (40.3) (40.3) Net periodic postretirement benefit credit $ (10.9) $ (11.7) $ (32.7) $ (35.1) 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 2023 and plans to utilize a portion of VEBA assets to make certain benefit payments.

Earnings per Share (EPS)

Earnings per Share (EPS)	9 Months Ended
	Sep. 30, 2023
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 and nine months ended September 30, 2023 and 2022 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 September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (In millions, except per share data) Basic EPS numerator: Income from continuing operations, net of income taxes $ 128.8 $ 384.4 $ 617.0 $ 675.9 Less: Net income attributable to noncontrolling interests 11.4 8.5 49.3 8.5 Income from continuing operations attributable to common stockholders 117.4 375.9 567.7 667.4 Income (loss) from discontinued operations, net of income taxes 2.5 (0.8) (0.1) (2.3) Net income attributable to common stockholders $ 119.9 $ 375.1 $ 567.6 $ 665.1 Diluted EPS numerator: Income from continuing operations, net of income taxes $ 128.8 $ 384.4 $ 617.0 $ 675.9 Add: Tax adjusted interest expense related to 2028 Convertible Notes 3.0 2.6 9.1 6.1 Less: Net income attributable to noncontrolling interests 11.4 8.5 49.3 8.5 Income from continuing operations attributable to common stockholders 120.4 378.5 576.8 673.5 Income (loss) from discontinued operations, net of income taxes 2.5 (0.8) (0.1) (2.3) Net income attributable to common stockholders $ 122.9 $ 377.7 $ 576.7 $ 671.2 EPS denominator: Weighted average shares outstanding — basic 133.2 144.1 140.0 141.4 Dilutive impact of share-based compensation awards 0.6 1.7 0.6 1.6 Dilutive impact of 2028 Convertible Notes 16.1 16.1 16.1 12.6 Weighted average shares outstanding — diluted 149.9 161.9 156.7 155.6 Basic EPS attributable to common stockholders: Income from continuing operations $ 0.88 $ 2.61 $ 4.06 $ 4.72 Income (loss) from discontinued operations 0.02 (0.01) (0.01) (0.02) Net income attributable to common stockholders $ 0.90 $ 2.60 $ 4.05 $ 4.70 Diluted EPS attributable to common stockholders: Income from continuing operations $ 0.80 $ 2.34 $ 3.68 $ 4.33 Income (loss) from discontinued operations 0.02 (0.01) — (0.02) Net income attributable to common stockholders $ 0.82 $ 2.33 $ 3.68 $ 4.31

Financial Instruments and Other

Financial Instruments and Other Guarantees	9 Months Ended
	Sep. 30, 2023
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. September 30, 2023 December 31, 2022 Reclamation Support Other Support (1) Total Reclamation Support Other Support (1) Total (Dollars in millions) Surety bonds $ 1,070.0 $ 127.9 $ 1,197.9 $ 1,250.1 $ 126.7 $ 1,376.8 Letters of credit (2) 6.0 101.4 107.4 437.8 131.8 569.6 1,076.0 229.3 1,305.3 1,687.9 258.5 1,946.4 Less: Letters of credit in support of surety bonds (3) (6.0) (11.5) (17.5) (431.7) (37.2) (468.9) Obligations supported, net $ 1,070.0 $ 217.8 $ 1,287.8 $ 1,256.2 $ 221.3 $ 1,477.5 (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 agreement, the Company was required to post collateral on a periodic basis through December 31, 2025. Prior to the April 2023 amendment, the Company had posted cumulative collateral of $557.8 million, primarily in the form of letters of credit. 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 represented a negotiated increase from the uncapped cumulative collateral amount prior to the amendment and will vary prospectively as bonding levels increase or decrease. The amendment also removed restrictions on the payment of dividends and share repurchases, and extended the agreement through December 31, 2026. In order to maintain the new maximum collateral standstill, 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 $586.1 million at September 30, 2023. 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, which commenced for the second quarter of 2023. The Company granted second liens on $200.0 million of mining equipment under the original agreement, which remain in force under the April 2023 amendment. 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 credit agreement which, as amended, provided for $237.2 million of capacity for irrevocable standby letters of credit (LC Facility). All letters of credit that were outstanding under the LC Facility were cancelled upon its termination and, in certain cases, replaced by cash-collateralized letters of credit or letters of credit issued under the Company’s accounts receivable securitization program. 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 $8.8 million during the nine months ended September 30, 2023 as a result of the February 2023 amendment and subsequent termination. 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 secured overnight financing rate (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 September 30, 2023, the Com pany had no outstanding borrowings and $107.4 million o f letters of credit outstanding under the Securitization Program, primarily in support of reclamation obligations. Availability under the Securitizatio n Program, which is adjusted for certain ineligible receivables, was $79.8 million at September 30, 2023. The Company was not required to post cash collateral under the Securitization Program at September 30, 2023. The Company incurred interest and fees associated with the Securitization Program of $0.9 million and $1.2 million during the three months ended September 30, 2023 and 2022, respectively, and $2.8 million and $3.4 million during the nine months ended September 30, 2023 and 2022, respectively, which have been recorded as “Interest expense” in the accompanying unaudited condensed consolidated statements of operations. Collateralized Letter of Credit Agreement 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 September 30, 2023, letters of credit of $167.0 million were outstanding under the agreement, which were collateralized by cash of $172.0 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 collateral generally includes deposits held by regulatory authorities or financial institutions over which the Company has no control or ability to access. September 30, 2023 December 31, 2022 (Dollars in millions) Restricted cash (1) Surety trust accounts (2) $ 471.1 $ — Collateralized letters of credit funding (2) 172.0 110.3 643.1 110.3 Other collateral (1) Deposits with regulatory authorities for reclamation and other obligations 223.0 33.6 LC Facility (3) — 28.5 Deposit held on behalf of surety — 15.0 223.0 77.1 Restricted cash and collateral $ 866.1 $ 187.4 (1) Restricted cash balances are combined with unrestricted cash and cash equivalents in the accompanying unaudited condensed consolidated statements of cash flows; changes in restricted cash balances are thus not reflected in the operating, investing or financing activities therein. Changes in other collateral balances are reflected as operating activities therein. (2) Surety trust accounts and the funding for collateralized letters of credit 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	9 Months Ended
	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Commitments Unconditional Purchase Obligations As of September 30, 2023, purchase commitments for capital expenditures were $91.1 million, all of which is obligated within the next two years, with $84.7 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, 2022. 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. Over the past few years, there has been significantly high rainfall in New South Wales, including unprecedented rain totals at the Metropolitan Mine site. While stormwater collected at the mine site is managed through two sedimentation dams, at times the heavy rainfall presented challenges with managing the significant volumes of stormwater, as the surface water management infrastructure has not had sufficient capacity. As a result, on multiple occasions throughout 2021 and 2022 stormwater was discharged from the mine site. Metropolitan Collieries Pty Ltd (MCPL), a wholly-owned subsidiary of PEC, removed accumulated material from the sedimentation dams to restore full site stormwater capacity by December 31, 2022 and identified and is implementing additional controls for the management of sediment moving forward. Despite the measures undertaken by MCPL to manage and improve the situation, the Environment Protection Authority commenced a prosecution for five breaches of the Protection of the Environment Operations Act 1997 on September 6, 2023. 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. Claims, Litigation and Settlements Relating to Indemnities or Historical Operations Patriot-Related Matters. Included in the Company’s discontinued operations are the previously divested legacy operations of Patriot Coal Corporation and certain of its wholly-owned subsidiaries (Patriot). In 2012, Patriot filed voluntary petitions for relief under Chapter 11 of Title 11 of the U.S. Code (the Bankruptcy Code). In 2013, the Company entered into a definitive settlement agreement (2013 Agreement) with Patriot and the United Mine Workers of America, on behalf of itself, its represented Patriot employees and its represented Patriot retirees, to resolve all then-disputed issues related to Patriot’s bankruptcy. In May 2015, Patriot again filed voluntary petitions for relief under the Bankruptcy Code and subsequently initiated a process to sell substantially all of its assets to qualified bidders. On October 9, 2015, Patriot’s bankruptcy court entered an order confirming Patriot’s plan of reorganization, which provided, among other things, for the sale of substantially all of Patriot’s assets to two different buyers. Patriot had federal and state black lung occupational disease liabilities related to workers employed in periods prior to Patriot’s spin-off from the Company in 2007. Upon spin-off, Patriot indemnified the Company against any claim relating to these liabilities, which amounted to approximately $150 million at that time. The indemnification included any claim made by the U.S. Department of Labor (DOL) against the Company with respect to these obligations as a potentially liable operator under the Federal Coal Mine Health and Safety Act of 1969. The 2013 Agreement included Patriot’s affirmance of indemnities provided in the spin-off agreements, including the indemnity relating to such black lung liabilities; however, Patriot rejected this indemnity in its May 2015 bankruptcy. By statute, the Company had secondary liability for the black lung liabilities related to Patriot’s workers employed by former subsidiaries of the Company (the Patriot Federal Black Lung Claims). The Company’s accounting for the black lung liabilities related to Patriot was based on an interpretation of applicable statutes. Management believed that inconsistencies existed among the applicable statutes, regulations promulgated under those statutes and the DOL’s interpretative guidance. The Company sought clarification from the DOL regarding these inconsistencies and challenged the DOL’s position in individual black lung claims. The amount of the liability, which was determined on an actuarial basis based on the best information available to the Company, was $82.3 million at December 31, 2022. The liability, which was classified as discontinued operations, was included in the Company’s condensed consolidated balance sheet within “Accounts payable and accrued expenses” and “Other noncurrent liabilities.”

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2023
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 chief operating decision maker, 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 September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (Dollars in millions) Revenue: Seaborne Thermal $ 297.4 $ 353.2 $ 1,043.4 $ 959.3 Seaborne Metallurgical 247.0 310.7 907.9 1,165.8 Powder River Basin 313.0 290.5 878.0 771.4 Other U.S. Thermal 228.2 261.4 677.5 689.4 Corporate and Other (6.7) 126.7 204.9 (230.1) Total $ 1,078.9 $ 1,342.5 $ 3,711.7 $ 3,355.8 Adjusted EBITDA: Seaborne Thermal $ 115.5 $ 171.2 $ 477.0 $ 438.5 Seaborne Metallurgical 78.6 113.2 271.9 593.9 Powder River Basin 54.1 37.9 116.1 43.5 Other U.S. Thermal 49.1 72.7 165.2 184.6 Corporate and Other (27.3) 43.9 (11.4) 83.7 Total $ 270.0 $ 438.9 $ 1,018.8 $ 1,344.2 A reconciliation of consolidated income from continuing operations, net of income taxes to Adjusted EBITDA follows: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (Dollars in millions) Income from continuing operations, net of income taxes $ 128.8 $ 384.4 $ 617.0 $ 675.9 Depreciation, depletion and amortization 82.3 80.7 239.2 227.4 Asset retirement obligation expenses 15.4 13.1 46.3 40.8 Restructuring charges 0.9 1.0 3.0 2.8 Asset impairment — 1.7 2.0 1.7 Provision for NARM and Shoal Creek loss 3.3 — 37.0 — Changes in amortization of basis difference related to equity affiliates (0.5) (0.5) (1.2) (1.7) Interest expense 13.8 33.8 45.5 110.8 Net loss on early debt extinguishment — 8.7 8.8 34.5 Interest income (20.3) (4.9) (56.5) (6.3) Unrealized (gains) losses on derivative contracts related to forecasted sales — (90.4) (159.0) 235.1 Unrealized losses (gains) on foreign currency option contracts 0.5 1.4 (0.1) 4.4 Take-or-pay contract-based intangible recognition (0.7) (0.8) (1.9) (2.2) Income tax provision 46.5 10.7 238.7 21.0 Adjusted EBITDA $ 270.0 $ 438.9 $ 1,018.8 $ 1,344.2

Other Events

Other Events	9 Months Ended
	Sep. 30, 2023
Other Events [Abstract]
Other Events	Other Events Coal Deposit Acquisition The Company entered into a definitive agreement dated October 26, 2023, with Stanmore SMC Pty Ltd (Stanmore) to acquire the southern part of Stanmore’s Wards Well tenements (Wards Well area) which are adjacent to the Company’s North Goonyella Mine in Queensland, Australia. The acquisition terms include cash consideration of $136 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. Completion of the transaction is subject to the satisfaction of certain conditions, including regulatory approvals. Share Repurchases During the three and nine months ended September 30, 2023, the Company repurchased approximately 3.7 million shares and 12.6 million shares, respectively, of its common stock for $82.4 million and $266.6 million, respectively, including commission fees. Of this amount, $2.6 million related to repurchases which settled subsequent to September 30, 2023. As of September 30, 2023, the Company had accrued excise taxes of $2.5 million related to the repurchases, which were unpaid at September 30, 2023. The Company includes commission fees and excise taxes, as incurred, with the cost of treasury stock. At September 30, 2023, $733.6 million remained available under its share repurchase program. From October 1, 2023 through October 27, 2023, the Company repurchased an additional 1.1 million shares for $27.3 million. 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 and nine months ended September 30, 2023, the Company recorded a provision for loss of $3.3 million and $8.3 million, respectively, related to the tornado damage. The combined provision includes $4.0 million for materials and supplies inventories, $1.0 million for buildings and equipment and $3.3 million for incremental repair costs. The Company anticipates that incremental repair costs will continue to be recorded in future periods. 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. Development coal production has been resumed in a new area of the mine. During the nine months ended September 30, 2023, the Company recorded a provision for loss of $28.7 million related to the fire. The provision includes $17.8 million related to longwall development and other costs and $10.9 million for equipment deemed inoperable within the affected area of the mine. In October, 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 nine months ended September 30, 2023, the Company entered into an agreement to assign the right to its excess port and rail capacity related to its North Goonyella Mine to an unrelated party in exchange for $30.0 million Australian dollars. Half of such amount was received by the Company upon entry into the agreement, and half is payable in June 2024, subject to certain conditions. In connection with the transaction, the Company recorded revenue of $19.2 million during the nine months ended September 30, 2023 and had a discounted receivable of $9.4 million included in “Accounts receivable, net” as of September 30, 2023.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pay vs Performance Disclosure
Net Income (Loss)	$ 119.9	$ 375.1	$ 567.6	$ 665.1

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Sep. 30, 2023
Trading Arrangements, by Individual
Material Terms of Trading Arrangement	Securities Trading Plans of Directors and Executive Officers During the three months ended September 30, 2023, none of Peabody’s directors or officers adopted or terminated a “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement,” as those terms are defined in Item 408 of Regulation S-K.
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities (Policies)	9 Months Ended
	Sep. 30, 2023
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, (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, (3) price risk and the variability of cash flows related to forecasted diesel fuel purchased for use in its operations and (4) interest rate risk on long-term debt. 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. The Company had no diesel fuel or interest rate derivatives in place as of September 30, 2023.

Revenue Recognition (Tables)

Revenue Recognition (Tables)	9 Months Ended
	Sep. 30, 2023
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 September 30, 2023 Seaborne Thermal Seaborne Metallurgical Powder River Basin Other U.S. Thermal Corporate and Other (1) Consolidated (Dollars in millions) Thermal coal Domestic $ 31.3 $ — $ 313.3 $ 227.1 $ — $ 571.7 Export 265.9 — — — — 265.9 Total thermal 297.2 — 313.3 227.1 — 837.6 Metallurgical coal Export — 246.0 — — — 246.0 Total metallurgical — 246.0 — — — 246.0 Other (2) 0.2 1.0 (0.3) 1.1 (6.7) (4.7) Revenue $ 297.4 $ 247.0 $ 313.0 $ 228.2 $ (6.7) $ 1,078.9 Three Months Ended September 30, 2022 Seaborne Thermal Seaborne Metallurgical Powder River Basin Other U.S. Thermal Corporate and Other (1) Consolidated (Dollars in millions) Thermal coal Domestic $ 44.8 $ — $ 290.2 $ 259.8 $ — $ 594.8 Export 308.3 — — — — 308.3 Total thermal 353.1 — 290.2 259.8 — 903.1 Metallurgical coal Export — 309.9 — — — 309.9 Total metallurgical — 309.9 — — — 309.9 Other (2) 0.1 0.8 0.3 1.6 126.7 129.5 Revenue $ 353.2 $ 310.7 $ 290.5 $ 261.4 $ 126.7 $ 1,342.5 Nine Months Ended September 30, 2023 Seaborne Thermal Seaborne Metallurgical Powder River Basin Other U.S. Thermal Corporate and Other (1) Consolidated (Dollars in millions) Thermal coal Domestic $ 100.7 $ — $ 878.1 $ 673.2 $ — $ 1,652.0 Export 942.2 — — — — 942.2 Total thermal 1,042.9 — 878.1 673.2 — 2,594.2 Metallurgical coal Export — 904.8 — — — 904.8 Total metallurgical — 904.8 — — — 904.8 Other (2) 0.5 3.1 (0.1) 4.3 204.9 212.7 Revenue $ 1,043.4 $ 907.9 $ 878.0 $ 677.5 $ 204.9 $ 3,711.7 Nine Months Ended September 30, 2022 Seaborne Thermal Seaborne Metallurgical Powder River Basin Other U.S. Thermal Corporate and Other (1) Consolidated (Dollars in millions) Thermal coal Domestic $ 125.0 $ — $ 771.6 $ 682.5 $ — $ 1,579.1 Export 833.7 — — 1.0 — 834.7 Total thermal 958.7 — 771.6 683.5 — 2,413.8 Metallurgical coal Export — 1,161.2 — — — 1,161.2 Total metallurgical — 1,161.2 — — — 1,161.2 Other (2) 0.6 4.6 (0.2) 5.9 (230.1) (219.2) Revenue $ 959.3 $ 1,165.8 $ 771.4 $ 689.4 $ (230.1) $ 3,355.8 (1) Corporate and Other includes the following: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (Dollars in millions) Unrealized gains (losses) on derivative contracts related to forecasted sales $ — $ 90.4 $ 159.0 $ (235.1) Realized losses on derivative contracts related to forecasted sales — (117.4) (80.9) (308.0) Revenue from physical sale of coal (3) (10.4) 150.7 97.4 294.0 Trading revenue (0.1) 0.3 — 10.7 Other (2) 3.8 2.7 29.4 8.3 Total Corporate and Other $ (6.7) $ 126.7 $ 204.9 $ (230.1) (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 September 30, 2023 and December 31, 2022 consisted of the following: September 30, 2023 December 31, 2022 (Dollars in millions) Trade receivables, net $ 294.1 $ 416.3 Miscellaneous receivables, net 54.3 49.2 Accounts receivable, net $ 348.4 $ 465.5

Inventories (Tables)

Inventories (Tables)	9 Months Ended
	Sep. 30, 2023
Inventory Disclosure [Abstract]
Schedule of Inventories	“Inventories, net” as of September 30, 2023 and December 31, 2022 consisted of the following: September 30, 2023 December 31, 2022 (Dollars in millions) Materials and supplies, net $ 155.7 $ 130.8 Raw coal 105.8 98.3 Saleable coal 90.5 67.0 Inventories, net $ 352.0 $ 296.1

Receivables, Loans, Notes Recei

Receivables, Loans, Notes Receivable, and Others (Tables)	9 Months Ended
	Sep. 30, 2023
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 “Income from equity affiliates”: (Income) Loss from Equity Affiliates Book Value at Three Months Ended September 30, Nine Months Ended September 30, September 30, 2023 December 31, 2022 2023 2022 2023 2022 (Dollars in millions) Equity method investment related to Middlemount $ 40.2 $ 27.1 $ (8.2) $ (28.4) $ (14.9) $ (123.6) Equity method investment related to R3 7.3 7.0 2.6 0.9 5.2 2.7 Total equity method investments $ 47.5 $ 34.1 $ (5.6) $ (27.5) $ (9.7) $ (120.9)

Derivatives and Fair Value Me_2

Derivatives and Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2023
Fair Value Disclosures [Abstract]
Fair Value, by Balance Sheet Grouping	The fair value of derivatives reflected in the accompanying condensed consolidated balance sheets are set forth in the table below. September 30, 2023 December 31, 2022 Asset Derivative Liability Derivative Asset Derivative Liability Derivative (Dollars in millions) Foreign currency option contracts $ 0.1 $ — $ 3.0 $ — Derivative contracts related to forecasted sales — — 100.6 (310.3) Financial trading contracts — — 11.7 — Total derivatives 0.1 — 115.3 (310.3) Effect of counterparty netting — — (100.6) 100.6 Variation margin (received) posted — — (11.7) 209.7 Net derivatives and variation margin as classified in the balance sheets $ 0.1 $ — $ 3.0 $ —
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 September 30, 2023 Total loss recognized in income Loss 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 $ (2.7) $ (2.2) $ (0.5) Financial trading contracts Revenue (0.1) (19.7) 19.6 Total $ (2.8) $ (21.9) $ 19.1 Three Months Ended September 30, 2022 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 $ (3.0) $ (1.6) $ (1.4) Derivative contracts related to forecasted sales Revenue (27.0) (117.4) 90.4 Financial trading contracts Revenue 0.3 0.5 (0.2) Total $ (29.7) $ (118.5) $ 88.8 Nine Months Ended September 30, 2023 Total (loss) gain recognized in income (Loss) gain realized in income on derivatives Unrealized gain (loss) recognized in income on derivatives Derivative Instrument Classification (Dollars in millions) Foreign currency option contracts Operating costs and expenses $ (7.8) $ (7.9) $ 0.1 Derivative contracts related to forecasted sales Revenue 78.1 (80.9) 159.0 Financial trading contracts Revenue — 11.5 (11.5) Total $ 70.3 $ (77.3) $ 147.6 Nine Months Ended September 30, 2022 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 $ (8.2) $ (3.8) $ (4.4) Derivative contracts related to forecasted sales Revenue (543.1) (308.0) (235.1) Financial trading contracts Revenue 10.7 0.6 10.1 Total $ (540.6) $ (311.2) $ (229.4)
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following tables set forth the hierarchy of the Company’s net asset (liability) positions for which fair value is measured on a recurring basis. Variation margin cash associated with the derivative balances is excluded from this table. September 30, 2023 Level 1 Level 2 Level 3 Total (Dollars in millions) Foreign currency option contracts $ — $ 0.1 $ — $ 0.1 Derivative contracts related to forecasted sales — — — — Financial trading contracts — — — — Equity securities 0.2 — — 0.2 Total net assets $ 0.2 $ 0.1 $ — $ 0.3 December 31, 2022 Level 1 Level 2 Level 3 Total (Dollars in millions) Foreign currency option contracts $ — $ 3.0 $ — $ 3.0 Derivative contracts related to forecasted sales — (209.7) — (209.7) Financial trading contracts — 11.7 — 11.7 Equity securities — — 2.5 2.5 Total net (liabilities) assets $ — $ (195.0) $ 2.5 $ (192.5)
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. September 30, 2023 December 31, 2022 (Dollars in millions) Total debt at par value $ 342.1 $ 343.6 Less: Unamortized debt issuance costs (8.5) (9.8) Net carrying amount $ 333.6 $ 333.8 Estimated fair value $ 506.2 $ 560.0

Property, Plant, Equipment an_2

Property, Plant, Equipment and Mine Development (Tables)	9 Months Ended
	Sep. 30, 2023
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 September 30, 2023 and December 31, 2022 is set forth in the table below: September 30, 2023 December 31, 2022 (Dollars in millions) Land and coal interests $ 2,511.9 $ 2,514.7 Buildings and improvements 633.5 594.2 Machinery and equipment 1,671.0 1,543.1 Less: Accumulated depreciation, depletion and amortization (2,010.9) (1,787.0) Property, plant, equipment and mine development, net $ 2,805.5 $ 2,865.0

Long-term Debt (Tables)

Long-term Debt (Tables)	9 Months Ended
	Sep. 30, 2023
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	The Company’s total indebtedness as of September 30, 2023 and December 31, 2022 consisted of the following: Debt Instrument (defined below, as applicable) September 30, 2023 December 31, 2022 (Dollars in millions) 3.250% Convertible Senior Notes due March 2028 (2028 Convertible Notes) $ 320.0 $ 320.0 Finance lease obligations 22.1 23.6 Less: Debt issuance costs (8.5) (9.8) 333.6 333.8 Less: Current portion of long-term debt 12.7 13.2 Long-term debt $ 320.9 $ 320.6
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 September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (Dollars in millions) Indebtedness $ 4.9 $ 20.8 $ 16.6 $ 70.7 Financial assurance instruments 8.9 13.0 28.9 40.1 Interest expense $ 13.8 $ 33.8 $ 45.5 $ 110.8 Cash paid for interest $ 14.8 $ 26.4 $ 56.7 $ 104.2 Non-cash interest expense $ 0.7 $ 4.6 $ 4.0 $ 13.6

Pension and Postretirement Be_2

Pension and Postretirement Benefit Costs (Tables)	9 Months Ended
	Sep. 30, 2023
Retirement Benefits [Abstract]
Schedule of Net Benefit Costs	Net periodic pension cost (credit) included the following components: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (Dollars in millions) Service cost for benefits earned $ 0.1 $ 0.1 $ 0.1 $ 0.1 Interest cost on projected benefit obligation 3.6 5.3 18.4 16.0 Expected return on plan assets (3.1) (6.0) (16.3) (17.9) Net periodic pension cost (credit) $ 0.6 $ (0.6) $ 2.2 $ (1.8) Net periodic postretirement benefit credit included the following components: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (Dollars in millions) Service cost for benefits earned $ 0.1 $ 0.2 $ 0.4 $ 0.6 Interest cost on accumulated postretirement benefit obligation 2.6 1.7 7.6 5.2 Expected return on plan assets (0.1) (0.2) (0.4) (0.6) Amortization of prior service credit (13.5) (13.4) (40.3) (40.3) Net periodic postretirement benefit credit $ (10.9) $ (11.7) $ (32.7) $ (35.1)

Earnings per Share (EPS) (Table

Earnings per Share (EPS) (Tables)	9 Months Ended
	Sep. 30, 2023
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 September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (In millions, except per share data) Basic EPS numerator: Income from continuing operations, net of income taxes $ 128.8 $ 384.4 $ 617.0 $ 675.9 Less: Net income attributable to noncontrolling interests 11.4 8.5 49.3 8.5 Income from continuing operations attributable to common stockholders 117.4 375.9 567.7 667.4 Income (loss) from discontinued operations, net of income taxes 2.5 (0.8) (0.1) (2.3) Net income attributable to common stockholders $ 119.9 $ 375.1 $ 567.6 $ 665.1 Diluted EPS numerator: Income from continuing operations, net of income taxes $ 128.8 $ 384.4 $ 617.0 $ 675.9 Add: Tax adjusted interest expense related to 2028 Convertible Notes 3.0 2.6 9.1 6.1 Less: Net income attributable to noncontrolling interests 11.4 8.5 49.3 8.5 Income from continuing operations attributable to common stockholders 120.4 378.5 576.8 673.5 Income (loss) from discontinued operations, net of income taxes 2.5 (0.8) (0.1) (2.3) Net income attributable to common stockholders $ 122.9 $ 377.7 $ 576.7 $ 671.2 EPS denominator: Weighted average shares outstanding — basic 133.2 144.1 140.0 141.4 Dilutive impact of share-based compensation awards 0.6 1.7 0.6 1.6 Dilutive impact of 2028 Convertible Notes 16.1 16.1 16.1 12.6 Weighted average shares outstanding — diluted 149.9 161.9 156.7 155.6 Basic EPS attributable to common stockholders: Income from continuing operations $ 0.88 $ 2.61 $ 4.06 $ 4.72 Income (loss) from discontinued operations 0.02 (0.01) (0.01) (0.02) Net income attributable to common stockholders $ 0.90 $ 2.60 $ 4.05 $ 4.70 Diluted EPS attributable to common stockholders: Income from continuing operations $ 0.80 $ 2.34 $ 3.68 $ 4.33 Income (loss) from discontinued operations 0.02 (0.01) — (0.02) Net income attributable to common stockholders $ 0.82 $ 2.33 $ 3.68 $ 4.31

Guarantees (Tables)

Guarantees (Tables)	3 Months Ended
	Sep. 30, 2023
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. September 30, 2023 December 31, 2022 Reclamation Support Other Support (1) Total Reclamation Support Other Support (1) Total (Dollars in millions) Surety bonds $ 1,070.0 $ 127.9 $ 1,197.9 $ 1,250.1 $ 126.7 $ 1,376.8 Letters of credit (2) 6.0 101.4 107.4 437.8 131.8 569.6 1,076.0 229.3 1,305.3 1,687.9 258.5 1,946.4 Less: Letters of credit in support of surety bonds (3) (6.0) (11.5) (17.5) (431.7) (37.2) (468.9) Obligations supported, net $ 1,070.0 $ 217.8 $ 1,287.8 $ 1,256.2 $ 221.3 $ 1,477.5 (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 collateral generally includes deposits held by regulatory authorities or financial institutions over which the Company has no control or ability to access. September 30, 2023 December 31, 2022 (Dollars in millions) Restricted cash (1) Surety trust accounts (2) $ 471.1 $ — Collateralized letters of credit funding (2) 172.0 110.3 643.1 110.3 Other collateral (1) Deposits with regulatory authorities for reclamation and other obligations 223.0 33.6 LC Facility (3) — 28.5 Deposit held on behalf of surety — 15.0 223.0 77.1 Restricted cash and collateral $ 866.1 $ 187.4 (1) Restricted cash balances are combined with unrestricted cash and cash equivalents in the accompanying unaudited condensed consolidated statements of cash flows; changes in restricted cash balances are thus not reflected in the operating, investing or financing activities therein. Changes in other collateral balances are reflected as operating activities therein. (2) Surety trust accounts and the funding for collateralized letters of credit 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)	9 Months Ended
	Sep. 30, 2023
Segment Reporting [Abstract]
Reportable Segment Results	Reportable segment results were as follows: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (Dollars in millions) Revenue: Seaborne Thermal $ 297.4 $ 353.2 $ 1,043.4 $ 959.3 Seaborne Metallurgical 247.0 310.7 907.9 1,165.8 Powder River Basin 313.0 290.5 878.0 771.4 Other U.S. Thermal 228.2 261.4 677.5 689.4 Corporate and Other (6.7) 126.7 204.9 (230.1) Total $ 1,078.9 $ 1,342.5 $ 3,711.7 $ 3,355.8 Adjusted EBITDA: Seaborne Thermal $ 115.5 $ 171.2 $ 477.0 $ 438.5 Seaborne Metallurgical 78.6 113.2 271.9 593.9 Powder River Basin 54.1 37.9 116.1 43.5 Other U.S. Thermal 49.1 72.7 165.2 184.6 Corporate and Other (27.3) 43.9 (11.4) 83.7 Total $ 270.0 $ 438.9 $ 1,018.8 $ 1,344.2
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 September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (Dollars in millions) Income from continuing operations, net of income taxes $ 128.8 $ 384.4 $ 617.0 $ 675.9 Depreciation, depletion and amortization 82.3 80.7 239.2 227.4 Asset retirement obligation expenses 15.4 13.1 46.3 40.8 Restructuring charges 0.9 1.0 3.0 2.8 Asset impairment — 1.7 2.0 1.7 Provision for NARM and Shoal Creek loss 3.3 — 37.0 — Changes in amortization of basis difference related to equity affiliates (0.5) (0.5) (1.2) (1.7) Interest expense 13.8 33.8 45.5 110.8 Net loss on early debt extinguishment — 8.7 8.8 34.5 Interest income (20.3) (4.9) (56.5) (6.3) Unrealized (gains) losses on derivative contracts related to forecasted sales — (90.4) (159.0) 235.1 Unrealized losses (gains) on foreign currency option contracts 0.5 1.4 (0.1) 4.4 Take-or-pay contract-based intangible recognition (0.7) (0.8) (1.9) (2.2) Income tax provision 46.5 10.7 238.7 21.0 Adjusted EBITDA $ 270.0 $ 438.9 $ 1,018.8 $ 1,344.2

Revenue Recognition - Revenue b

Revenue Recognition - Revenue by Product Type and Market (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Revenues	$ 1,078.9	$ 1,342.5	$ 3,711.7	$ 3,355.8
Other Income	3.8	2.7	29.4	8.3
Designated as Hedging Instrument
Disaggregation of Revenue [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	19.1	88.8	147.6	(229.4)
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(21.9)	(118.5)	(77.3)	(311.2)
Derivative, Gain (Loss) on Derivative, Net	(2.8)	(29.7)	70.3	(540.6)
Derivative contracts related to forecasted sales | Designated as Hedging Instrument
Disaggregation of Revenue [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	0	90.4	159	(235.1)
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	0	(117.4)	(80.9)	(308)
Derivative, Gain (Loss) on Derivative, Net		(27)	78.1	(543.1)
Financial trading contracts | Designated as Hedging Instrument
Disaggregation of Revenue [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	19.6	(0.2)	(11.5)	10.1
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(19.7)	0.5	11.5	0.6
Derivative, Gain (Loss) on Derivative, Net	(0.1)	0.3	0	10.7
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	90.4	159	(235.1)
Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	837.6	903.1	2,594.2	2,413.8
Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	246	309.9	904.8	1,161.2
Other (2)
Disaggregation of Revenue [Line Items]
Revenues	(4.7)	129.5	212.7	(219.2)
Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	571.7	594.8	1,652	1,579.1
Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	265.9	308.3	942.2	834.7
Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	246	309.9	904.8	1,161.2
Seaborne Thermal
Disaggregation of Revenue [Line Items]
Revenues	297.4	353.2	1,043.4	959.3
Seaborne Thermal | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	297.2	353.1	1,042.9	958.7
Seaborne Thermal | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Seaborne Thermal | Other (2)
Disaggregation of Revenue [Line Items]
Revenues	0.2	0.1	0.5	0.6
Seaborne Thermal | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	31.3	44.8	100.7	125
Seaborne Thermal | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	265.9	308.3	942.2	833.7
Seaborne Thermal | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Seaborne Metallurgical
Disaggregation of Revenue [Line Items]
Revenues	247	310.7	907.9	1,165.8
Seaborne Metallurgical | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Seaborne Metallurgical | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	246	309.9	904.8	1,161.2
Seaborne Metallurgical | Other (2)
Disaggregation of Revenue [Line Items]
Revenues	1	0.8	3.1	4.6
Seaborne Metallurgical | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Seaborne Metallurgical | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Seaborne Metallurgical | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	246	309.9	904.8	1,161.2
Powder River Basin
Disaggregation of Revenue [Line Items]
Revenues	313	290.5	878	771.4
Powder River Basin | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	313.3	290.2	878.1	771.6
Powder River Basin | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Powder River Basin | Other (2)
Disaggregation of Revenue [Line Items]
Revenues	(0.3)	0.3	(0.1)	(0.2)
Powder River Basin | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	313.3	290.2	878.1	771.6
Powder River Basin | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Powder River Basin | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Other U.S. Thermal
Disaggregation of Revenue [Line Items]
Revenues	228.2	261.4	677.5	689.4
Other U.S. Thermal | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	227.1	259.8	673.2	683.5
Other U.S. Thermal | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Other U.S. Thermal | Other (2)
Disaggregation of Revenue [Line Items]
Revenues	1.1	1.6	4.3	5.9
Other U.S. Thermal | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	227.1	259.8	673.2	682.5
Other U.S. Thermal | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	1
Other U.S. Thermal | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Corporate and Other (1)
Disaggregation of Revenue [Line Items]
Revenues	(6.7)	126.7	204.9	(230.1)
Corporate and Other (1) | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Corporate and Other (1) | Trading and Brokerage Coal Deliveries
Disaggregation of Revenue [Line Items]
Revenues	(10.4)	150.7	97.4	294
Corporate and Other (1) | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Corporate and Other (1) | Other (2)
Disaggregation of Revenue [Line Items]
Revenues	(6.7)	126.7	204.9	(230.1)
Corporate and Other (1) | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Corporate and Other (1) | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Corporate and Other (1) | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	$ 0	$ 0	$ 0	$ 0

Revenue Recognition - Accounts

Revenue Recognition - Accounts Receivable (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Revenue Recognition [Abstract]
Trade receivables, net	$ 294.1	$ 416.3
Miscellaneous receivables, net	54.3	49.2
Accounts receivable, net	$ 348.4	$ 465.5

Revenue Recognition - Narrative

Revenue Recognition - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Revenue Recognition [Abstract]
Accounts receivable, allowance for credit loss	$ 0		$ 0		$ 0
Accounts receivable, credit loss expense (reversal)	$ 0	$ 0	$ 0	$ 0

Inventories (Details)

Inventories (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Inventory [Line Items]
Materials and supplies, net	$ 155.7	$ 130.8
Raw coal	105.8	98.3
Saleable coal	90.5	67
Inventories, net	$ 352	$ 296.1

Inventories Narrative (Details)

Inventories Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Material and supplies
Inventory [Line Items]
inventory reserves	$ 7.8	$ 9.5

Equity Method Investments (Deta

Equity Method Investments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 47.5		$ 47.5		$ 34.1
Income (Loss) from Equity Method Investments	(5.6)	$ (27.5)	(9.7)	$ (120.9)
Middlemount Mine
Schedule of Equity Method Investments [Line Items]
Equity method investments	40.2		40.2		27.1
Income (Loss) from Equity Method Investments	8.2	28.4	14.9	123.6
R3 Renewables
Schedule of Equity Method Investments [Line Items]
Equity method investments	7.3		7.3		$ 7
Income (Loss) from Equity Method Investments	$ (2.6)	$ (0.9)	$ (5.2)	$ (2.7)

Equity Method Investments Narra

Equity Method Investments Narrative (Details) $ in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 AUD ($)	Dec. 31, 2022 USD ($)
Schedule of Equity Method Investments [Line Items]
Revolving Loans	$ 0			$ 0
R3 Renewables
Schedule of Equity Method Investments [Line Items]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	$ 5.5	$ 10.9
Middlemount Mine
Schedule of Equity Method Investments [Line Items]
Financing receivable, stated interest rate (in percent)	10%
Revolving loan limit			$ 50
Equity interest percentage of revolving loans limit	50%		50%
Cash receipts from Middlemount Coal Pty Ltd and other related parties	$ 0	$ 151.5

Derivatives and Fair Value Me_3

Derivatives and Fair Value Measurements - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($) $ / $	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) $ / $	Sep. 30, 2022 USD ($)	Sep. 30, 2023 AUD ($) $ / $	Dec. 31, 2022 USD ($)
Derivatives, Fair Value [Line Items]
Unobservable Measurement Input, Uncertainty, Description			10
Asset impairment	$ 0	$ 1.7	$ 2	$ 1.7
Fair Value, Inputs, Level 1, 2 and 3
Derivatives, Fair Value [Line Items]
Derivative assets (liabilities), at fair value	0	0	0	0
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Variation margin (received) posted	0		0			$ (209.7)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	19.1	88.8	147.6	(229.4)
Foreign currency option contracts
Derivatives, Fair Value [Line Items]
Notional amount	$ 339		$ 339		$ 615,000,000
Derivative, Floor Price					0.60
Derivative, Cap Price					0.75
Foreign currency option contracts | Minimum
Derivatives, Fair Value [Line Items]
Derivative, exchange rate cap (in dollars per share) | $ / $	0.70		0.70		0.70
Foreign currency option contracts | Maximum
Derivatives, Fair Value [Line Items]
Derivative, exchange rate cap (in dollars per share) | $ / $	0.72		0.72		0.72
Foreign currency option contracts | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	$ (0.5)	(1.4)	$ 0.1	(4.4)
Financial trading contracts | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	19.6	(0.2)	(11.5)	10.1
Diesel Fuel Hedge Contracts
Derivatives, Fair Value [Line Items]
Notional amount					$ 0
Coal Contract and Physical commodity purchase / sale contracts | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	0	90.4	159	(235.1)
Gain (Loss) on Derivative Instruments | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax		49		257
Forward Contracts | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax		41	0	22
Derivative contracts related to forecasted sales | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	0	$ 90.4	159	$ (235.1)
Coal derivative contracts related to forecasted sales
Derivatives, Fair Value [Line Items]
Notional amount					$ 0
Variation Margin Cash | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Variation margin (received) posted						198
Total Margin Posted
Derivatives, Fair Value [Line Items]
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset	$ 0		$ 0			255.5
Initial Margin Posted
Derivatives, Fair Value [Line Items]
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset						$ 57.5

Derivatives and Fair Value Me_4

Derivatives and Fair Value Measurements - Derivatives by Balance Sheet Classification (Details) - Designated as Hedging Instrument - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Asset Derivative
Derivative Asset, Fair Value, Gross Asset	$ 0.1	$ 115.3
Effect of counterparty netting	0	(100.6)
Variation margin (received) posted	0	(11.7)
Net derivatives and variation margin as classified in the balance sheets	0.1	3
Liability Derivative
Liability Derivative	0	(310.3)
Effect of counterparty netting	0	100.6
Variation margin (received) posted	0	209.7
Net derivatives and variation margin as classified in the balance sheets	0	0
Foreign currency option contracts
Asset Derivative
Derivative Asset, Fair Value, Gross Asset	0.1	3
Liability Derivative
Liability Derivative	0	0
Derivative contracts related to forecasted sales
Asset Derivative
Derivative Asset, Fair Value, Gross Asset	0	100.6
Liability Derivative
Liability Derivative	0	(310.3)
Financial trading contracts
Asset Derivative
Derivative Asset, Fair Value, Gross Asset	0	11.7
Liability Derivative
Liability Derivative	$ 0	$ 0

Derivatives and Fair Value Me_5

Derivatives and Fair Value Measurements - Gains and Losses on Hedging Derivatives (Details) - Designated as Hedging Instrument - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ (2.8)	$ (29.7)	$ 70.3	$ (540.6)
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(21.9)	(118.5)	(77.3)	(311.2)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	19.1	88.8	147.6	(229.4)
Variation margin (received) posted	0		0		$ 209.7
Foreign currency option contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(2.7)	(3)	(7.8)	(8.2)
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(2.2)	(1.6)	(7.9)	(3.8)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	(0.5)	(1.4)	0.1	(4.4)
Derivative contracts related to forecasted sales
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net		(27)	78.1	(543.1)
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	0	(117.4)	(80.9)	(308)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	0	90.4	159	(235.1)
Financial trading contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(0.1)	0.3	0	10.7
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(19.7)	0.5	11.5	0.6
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	$ 19.6	$ (0.2)	$ (11.5)	$ 10.1

Derivatives and Fair Value Me_6

Derivatives and Fair Value Measurements - Financial Instruments Measured on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Derivative assets (liabilities), at fair value	$ 0.3	$ (192.5)
Equity securities	0.2	2.5
Level 1
Derivative [Line Items]
Derivative assets (liabilities), at fair value	0.2	0
Equity securities	0.2	0
Level 2
Derivative [Line Items]
Derivative assets (liabilities), at fair value	0.1	(195)
Equity securities	0	0
Level 3
Derivative [Line Items]
Derivative assets (liabilities), at fair value	0	2.5
Equity securities	0	2.5
Foreign currency option contracts
Derivative [Line Items]
Derivative assets (liabilities), at fair value	0.1	3
Foreign currency option contracts | Level 1
Derivative [Line Items]
Derivative assets (liabilities), at fair value	0	0
Foreign currency option contracts | Level 2
Derivative [Line Items]
Derivative assets (liabilities), at fair value	0.1	3
Foreign currency option contracts | Level 3
Derivative [Line Items]
Derivative assets (liabilities), at fair value	0	0
Derivative contracts related to forecasted sales
Derivative [Line Items]
Derivative assets (liabilities), at fair value	0	(209.7)
Derivative contracts related to forecasted sales | Level 1
Derivative [Line Items]
Derivative assets (liabilities), at fair value	0	0
Derivative contracts related to forecasted sales | Level 2
Derivative [Line Items]
Derivative assets (liabilities), at fair value	0	(209.7)
Derivative contracts related to forecasted sales | Level 3
Derivative [Line Items]
Derivative assets (liabilities), at fair value	0	0
Financial trading contracts
Derivative [Line Items]
Derivative assets (liabilities), at fair value	0	11.7
Financial trading contracts | Level 1
Derivative [Line Items]
Derivative assets (liabilities), at fair value	0	0
Financial trading contracts | Level 2
Derivative [Line Items]
Derivative assets (liabilities), at fair value	0	11.7
Financial trading contracts | Level 3
Derivative [Line Items]
Derivative assets (liabilities), at fair value	$ 0	$ 0

Derivatives and Fair Value Me_7

Derivatives and Fair Value Measurements - Long-term debt (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Carrying amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt at par value	$ 342.1	$ 343.6
Net carrying amount	333.6	333.8
Estimated fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value	506.2	560
Less: Unamortized debt issuance costs	(8.5)	(9.8)
Net carrying amount	$ 333.6	$ 333.8

Derivatives and Fair Value Me_8

Derivatives and Fair Value Measurements - Pre-Tax Gains and Losses on Hedging Derivatives (Details) - Designated as Hedging Instrument - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ (2.8)	$ (29.7)	$ 70.3	$ (540.6)
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(21.9)	(118.5)	(77.3)	(311.2)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	19.1	88.8	147.6	(229.4)
Foreign currency option contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(2.7)	(3)	(7.8)	(8.2)
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(2.2)	(1.6)	(7.9)	(3.8)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	(0.5)	(1.4)	0.1	(4.4)
Derivative contracts related to forecasted sales
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net		(27)	78.1	(543.1)
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	0	(117.4)	(80.9)	(308)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	0	90.4	159	(235.1)
Financial trading contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(0.1)	0.3	0	10.7
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(19.7)	0.5	11.5	0.6
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	$ 19.6	$ (0.2)	$ (11.5)	$ 10.1

Property, Plant, Equipment an_3

Property, Plant, Equipment and Mine Development (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Less: Accumulated depreciation, depletion and amortization	$ (2,010.9)	$ (1,787)
Property, plant, equipment and mine development, net	2,805.5	2,865
Land and coal interests
Property, Plant and Equipment [Line Items]
Property, Plant, Equipment, and mine development, gross	2,511.9	2,514.7
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, Plant, Equipment, and mine development, gross	633.5	594.2
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, Plant, Equipment, and mine development, gross	$ 1,671	$ 1,543.1

Property, Plant, Equipment an_4

Property, Plant, Equipment and Mine Development - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Impaired Long-Lived Assets Held and Used [Line Items]
At-risk assets	$ 388		$ 388
Asset impairment	$ 0	$ 1.7	$ 2	$ 1.7

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Taxes
Income tax provision (benefit)	$ 46.5	$ 10.7	$ 238.7	$ 21
Foreign Tax Authority
Income Taxes
Remeasurement of income tax	$ (3.3)	$ (1.6)	$ (2.6)	$ (3.5)

Long-term Debt - Schedule of De

Long-term Debt - Schedule of Debt (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Debt Instrument [Line Items]
Finance lease obligations	$ 22.1		$ 22.1		$ 23.6
Less: Unamortized debt issuance costs	(8.5)		(8.5)		(9.8)
Total debt	333.6		333.6		333.8
Less: Current portion of long-term debt	12.7		12.7		13.2
Long-term debt	320.9		320.9		320.6
Interest expense	13.8	$ 33.8	45.5	$ 110.8
Interest Paid, Capitalized, Investing Activities	14.8	26.4	56.7	104.2
Other Noncash Income (Expense)	0.7	4.6
Noncash interest expense, net			4	13.6
Financial assurance instruments
Debt Instrument [Line Items]
Interest expense	8.9	13	28.9	40.1
Indebtedness
Debt Instrument [Line Items]
Interest expense	4.9	$ 20.8	16.6	$ 70.7
Senior Notes | 3.250% Convertible Senior Notes due March 2028 (2028 Convertible Notes)
Debt Instrument [Line Items]
Long-term debt	$ 320		$ 320		$ 320
Stated interest rate	3.25%		3.25%

Long-term Debt - Narrative (Det

Long-term Debt - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Mar. 01, 2022
Debt Instrument [Line Items]
Debt issuance cost	$ 8.5			$ 8.5		$ 9.8
Interest expense	13.8	$ 33.8		45.5	$ 110.8
Net loss on early debt extinguishment	0	8.7		8.8	34.5
Finance lease obligations	22.1			22.1		23.6
Interest Paid, Capitalized, Investing Activities	$ 14.8	$ 26.4		$ 56.7	$ 104.2
Dividends Payable, Amount Per Share	$ 0.150			$ 0.150
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				$ 99
8.500% Senior Secured Notes due December 20242 and 6.375% Senior Secured Notes due March 2025 [Domain]
Debt Instrument [Line Items]
Net loss on early debt extinguishment			$ 23
Senior Notes | 3.250% Convertible Senior Notes due March 2028 (2028 Convertible Notes)
Debt Instrument [Line Items]
Stated interest rate	3.25%			3.25%
Long-term debt	$ 320			$ 320		$ 320
Principal amount							$ 320
Debt Issuance Costs, Gross			11.2
Debt Conversion, Converted Instrument, Rate	1%
Debt Instrument, Convertible, Conversion Ratio	50.3816
Debt Instrument, Convertible, Conversion Ratio, Revised	50.7205
Senior Notes | 6.375% Senior Secured Notes due March 2025 (2025 Notes)
Debt Instrument [Line Items]
Debt repurchase, amount			257.4
Senior Notes | 8.500% Senior Secured Notes due December 2024 (2024 Peabody Notes)
Debt Instrument [Line Items]
Debt repurchase, amount			$ 62.6

Pension and Postretirement Be_3

Pension and Postretirement Benefit Costs - Schedule of Net Periodic Benefit (Benefit) Cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]
Net periodic pension cost (credit)	$ (10)	$ (12.2)	$ (29.4)	$ (36.7)
Defined benefit pension plans
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	0.1	0.1	0.1	0.1
Interest cost on projected benefit obligation	3.6	5.3	18.4	16
Expected return on plan assets	(3.1)	(6)	(16.3)	(17.9)
Net periodic pension cost (credit)	0.6	(0.6)	2.2	(1.8)
Postretirement benefit plans
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	0.1	0.2	0.4	0.6
Interest cost on projected benefit obligation	2.6	1.7	7.6	5.2
Expected return on plan assets	(0.1)	(0.2)	(0.4)	(0.6)
Amortization of prior service credit	(13.5)	(13.4)	(40.3)	(40.3)
Net periodic pension cost (credit)	$ (10.9)	$ (11.7)	$ (32.7)	$ (35.1)

Pension and Postretirement Be_4

Pension and Postretirement Benefit Costs - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Mar. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Liability for Future Policy Benefits, Individual and Group Annuities and Supplementary Contracts		$ 500
Defined benefit pension plans
Defined Benefit Plan Disclosure [Line Items]
Funding threshold	80%
Defined Benefit Plan, Benefit Obligation, Payment for Settlement	$ 442

Earnings per Share (EPS) - Narr

Earnings per Share (EPS) - Narrative (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Antidilutive shares excluded from EPS calculation (in shares)	100,000	100,000	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		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Basic EPS numerator:
Weighted average shares outstanding — basic	133,200,000	144,100,000	140,000,000	141,400,000
Dilutive impact of share-based compensation awards	600,000	1,700,000	600,000	1,600,000
Dilutive impact of 2028 Convertible Notes	16,100,000	16,100,000	16,100,000	12,600,000
Basic income per share	$ 0.88	$ 2.61	$ 4.06	$ 4.72
Income (loss) from discontinued operations	0.02	(0.01)	(0.01)	(0.02)
Basic income per share	$ 0.90	$ 2.60	$ 4.05	$ 4.70
Income from continuing operations, net of income taxes	$ 128.8	$ 384.4	$ 617	$ 675.9
Add: Tax adjusted interest expense related to 2028 Convertible Notes	3	2.6	9.1	6.1
Income (loss) from discontinued operations, net of income taxes	2.5	(0.8)	(0.1)	(2.3)
Less: Net income attributable to noncontrolling interests	11.4	8.5	49.3	8.5
Income from continuing operations attributable to common stockholders	117.4	375.9	567.7	667.4
Income from continuing operations attributable to common stockholders	120.4	378.5	576.8	673.5
Net income attributable to common stockholders	$ 122.9	$ 377.7	$ 576.7	$ 671.2
Weighted average shares outstanding — diluted	149,900,000	161,900,000	156,700,000	155,600,000
Less: Net income attributable to noncontrolling interests	$ 11.4	$ 8.5	$ 49.3	$ 8.5
Income from continuing operations attributable to common stockholders	120.4	378.5	576.8	673.5
Income (loss) from discontinued operations, net of income taxes	2.5	(0.8)	(0.1)	(2.3)
Net income attributable to common stockholders	$ 119.9	$ 375.1	$ 567.6	$ 665.1
Diluted EPS attributable to common stockholders:
Income from continuing operations	$ 0.80	$ 2.34	$ 3.68	$ 4.33
Income (loss) from discontinued operations	0.02	(0.01)	0	(0.02)
Net income attributable to common stockholders	$ 0.82	$ 2.33	$ 3.68	$ 4.31
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive impact of 2028 Convertible Notes	16,100,000	16,100,000	16,100,000	12,600,000
Impact of dilutive securities (in shares)	16,100,000	16,100,000	16,100,000	12,600,000

Financial Instruments and Oth_2

Financial Instruments and Other Guarantees (Details) - USD ($) $ in Millions	Sep. 30, 2023	Apr. 14, 2023	Mar. 31, 2023	Dec. 31, 2022
Guarantee Obligations [Line Items]
Restricted Cash	$ 643.1			$ 110.3
Deposits Assets	223			77.1
Restricted cash and collateral	866.1			187.4
LC Facility
Guarantee Obligations [Line Items]
Deposits Assets	0			28.5
Surety Trust Account
Guarantee Obligations [Line Items]
Restricted Cash	471.1		$ 566.3	0
Collateralized letters of credit funding
Guarantee Obligations [Line Items]
Restricted Cash	172			110.3
Deposits with Regulatory Authorities
Guarantee Obligations [Line Items]
Deposits Assets	223			33.6
Deposits Held on Behalf of Surety
Guarantee Obligations [Line Items]
Deposits Assets	0			15
Asset Retirement Obligations
Guarantee Obligations [Line Items]
Letters of credit outstanding, amount	6			437.8
Surety Bonds and Letters of Credit Outstanding for Reclamation Support	1,076			1,687.9
Letters of Credit in Support of Surety Bonds	(6)			(431.7)
Total Obligations Supported, Net	1,070			1,256.2
Surety bonds amount	1,070			1,250.1
Asset Retirement and Other Obligations
Guarantee Obligations [Line Items]
Letters of credit outstanding, amount	107.4			569.6
Total Surety Bonds and Letters of Credit Outstanding	1,305.3			1,946.4
Total Letters of Credit in Support of Surety Bonds	(17.5)			(468.9)
Total Obligations Supported, Net	1,287.8			1,477.5
Surety bonds amount	1,197.9			1,376.8
Other Obligations
Guarantee Obligations [Line Items]
Letters of credit outstanding, amount	101.4			131.8
Surety Bonds and Letters of Credit Outstanding for Other Support	229.3			258.5
Letters of Credit in Support of Surety Bonds	(11.5)			(37.2)
Total Obligations Supported, Net	217.8			221.3
Surety bonds amount	$ 127.9			$ 126.7
LC Facility
Guarantee Obligations [Line Items]
Mandatory Repurchase, Percentage of Accreted Value	95%
Debt instrument, repurchase amount	$ 30	$ 30
Secured debt | Accounts Receivable Securitization Program
Guarantee Obligations [Line Items]
Letters of credit outstanding, amount	107.4
Collateralized Letter of Credit Agreement
Guarantee Obligations [Line Items]
Letters of credit outstanding, amount	$ 167

Financial Instruments and Oth_3

Financial Instruments and Other Guarantees - Narratives (Details) - USD ($) $ in Millions		3 Months Ended			9 Months Ended
	Feb. 03, 2023	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Apr. 14, 2023	Mar. 31, 2023	Feb. 13, 2023	Dec. 31, 2022
Guarantee Obligations [Line Items]
Line of Credit Facility, Current Borrowing Capacity							$ 237.2
Cumulative Collateral			$ 557.8
Net loss on early debt extinguishment		$ 0		$ 8.7	$ 8.8	$ 34.5
Interest expense		13.8		33.8	45.5	110.8
Restricted Cash		643.1			643.1					$ 110.3
Difference between penal sum of all surety bonds and amount of collateral posted in favor of surety providers		586.1			586.1
Letter of Credit
Guarantee Obligations [Line Items]
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%
Collateralized Letter of Credit Agreement
Guarantee Obligations [Line Items]
Letters of credit outstanding, amount		167			167
Line of credit facility, maximum borrowing capacity		$ 250			$ 250
Cash Collateral, Percentage of the aggregate amount of letters of credit outstanding		103%			103%
Cash-collateralized Letters of Credit		$ 172			$ 172
Stated interest rate		0.75%			0.75%
Surety Trust Account
Guarantee Obligations [Line Items]
Restricted Cash		$ 471.1			$ 471.1			$ 566.3		$ 0
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		107.4			$ 107.4
Basis spread on variable rate					2.10%
Maximum
Guarantee Obligations [Line Items]
Debt Instrument, Collateral Amount							$ 721.8
Maximum | Collateralized Letter of Credit Agreement
Guarantee Obligations [Line Items]
Transaction support agreements, additional collateral demands		5			$ 5
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			400
Debt instrument, transaction support agreements, fair value of second liens on mining equipment		$ 200			$ 200
Surety Bond | Maximum
Guarantee Obligations [Line Items]
Net Leverage Ratio		1.5			1.5
Surety Bond | Minimum
Guarantee Obligations [Line Items]
Net Leverage Ratio		1			1
Senior Notes | 3.250% Convertible Senior Notes due March 2028 (2028 Convertible Notes)
Guarantee Obligations [Line Items]
Debt Instrument, Funded, Percent		50%			50%
Stated interest rate		3.25%			3.25%
Secured debt | Accounts Receivable Securitization Program
Guarantee Obligations [Line Items]
Outstanding borrowings		$ 0			$ 0
Accounts Receivable from Securitization		79.8			79.8
Interest expense		$ 0.9		$ 1.2	$ 2.8	$ 3.4

Commitments and Contingencies (

Commitments and Contingencies (Details) $ in Millions	Sep. 30, 2023 USD ($)	Aug. 08, 2023 USD ($)	Dec. 31, 2022 USD ($)	Oct. 09, 2015 buyer	Dec. 31, 2007 USD ($)
Long-term Purchase Commitment [Line Items]
Patriot Black Lung, Payment for Settlement		$ 72
Patriot Federal Black Lung, Gain (Loss) Due to Settlement		3.9
Patriot Federal Black Lung, Settlement Fees		$ 4.2
Patriot
Long-term Purchase Commitment [Line Items]
Number of buyers | buyer				2
Black Lung Occupational Disease Liability | Patriot | Spinoff
Long-term Purchase Commitment [Line Items]
Initially determined potential exposure from patriot bankruptcy					$ 150
Black Lung Occupational Disease Liability | Patriot | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations
Long-term Purchase Commitment [Line Items]
Initially determined potential exposure from patriot bankruptcy			$ 82.3
Capital Addition Purchase Commitments
Long-term Purchase Commitment [Line Items]
Unrecorded unconditional purchase obligation (within next five years)	$ 91.1
Unrecorded unconditional purchase obligation (within next 12 months)	$ 84.7

Segment Information - Segment R

Segment Information - Segment Results (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Reportable segment results
Revenues	$ 1,078.9	$ 1,342.5	$ 3,711.7	$ 3,355.8
Adjusted EBITDA	270	438.9	1,018.8	1,344.2
Seaborne Thermal
Reportable segment results
Revenues	297.4	353.2	1,043.4	959.3
Adjusted EBITDA	115.5	171.2	477	438.5
Seaborne Metallurgical
Reportable segment results
Revenues	247	310.7	907.9	1,165.8
Adjusted EBITDA	78.6	113.2	271.9	593.9
Powder River Basin
Reportable segment results
Revenues	313	290.5	878	771.4
Adjusted EBITDA	54.1	37.9	116.1	43.5
Other U.S. Thermal
Reportable segment results
Revenues	228.2	261.4	677.5	689.4
Adjusted EBITDA	49.1	72.7	165.2	184.6
Corporate and Other (1)
Reportable segment results
Revenues	(6.7)	126.7	204.9	(230.1)
Adjusted EBITDA	$ (27.3)	$ 43.9	$ (11.4)	$ 83.7

Segment Information - Reconcili

Segment Information - Reconciliation to Adjusted EBITDA (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Income from continuing operations, net of income taxes	$ 128.8	$ 384.4	$ 617	$ 675.9
Depreciation, depletion and amortization	82.3	80.7	239.2	227.4
Asset retirement obligation expenses	15.4	13.1	46.3	40.8
Restructuring charges	0.9	1	3	2.8
Asset impairment	0	1.7	2	1.7
Provision for NARM and Shoal Creek loss	3.3	0	37	0
Changes in amortization of basis difference related to equity affiliates	(0.5)	(0.5)	(1.2)	(1.7)
Interest expense	13.8	33.8	45.5	110.8
Net loss on early debt extinguishment	0	8.7	8.8	34.5
Interest income	(20.3)	(4.9)	(56.5)	(6.3)
Unrealized (gains) losses on derivative contracts related to forecasted sales	0	(90.4)	(159)	235.1
Unrealized losses (gains) on foreign currency option contracts	0.5	1.4	(0.1)	4.4
Take-or-pay contract-based intangible recognition	(0.7)	(0.8)	(1.9)	(2.2)
Income tax provision	46.5	10.7	238.7	21
Adjusted EBITDA	$ 270	$ 438.9	$ 1,018.8	$ 1,344.2

Other Events Narrative (Details

Other Events Narrative (Details) $ in Millions			1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 25, 2023 USD ($)	Oct. 02, 2023 USD ($)	Oct. 27, 2023 USD ($) shares	Sep. 30, 2023 USD ($) shares	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) shares	Sep. 30, 2022 USD ($)	Sep. 30, 2022 AUD ($)
Other Commercial Events [Line Items]
Revenues				$ 1,078,900,000	$ 1,342,500,000	$ 3,711,700,000	$ 3,355,800,000
Other Noncash Income						9,400,000	0
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				82,400,000		266,600,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount				$ 733,600,000		$ 733,600,000
Stock Repurchased During Period, Shares | shares				3,700,000		12,600,000
Subsequent Event
Other Commercial Events [Line Items]
Common stock repurchase amount including commission fees			$ 27,300,000
Stock Repurchased During Period, Shares | shares			1,100,000
Unsettled common stock repurchases		$ 2,600,000
Subsequent Event | Wards Well coal deposit
Other Commercial Events [Line Items]
Asset Acquisition, Price of Acquisition, Expected	$ 136,000,000
Contingent royalty	$ 200,000,000
Treasury Stock, Common
Other Commercial Events [Line Items]
Sales and Excise Tax Payable				$ 900,000	0	$ 2,500,000	0
Unsettled common stock repurchases				(8,600,000)	$ 0	2,600,000	$ 0
North Antelope Rochelle Mine
Other Commercial Events [Line Items]
Storm Damage Provision				$ 3,300,000		8,300,000
North Antelope Rochelle Mine | Materials and supplies inventories
Other Commercial Events [Line Items]
Storm Damage Provision						4,000,000
North Antelope Rochelle Mine | Buildings and equipment
Other Commercial Events [Line Items]
Storm damage provision for buildings and equipment						1,000,000
North Antelope Rochelle Mine | Incremental repair costs
Other Commercial Events [Line Items]
Storm Damage Provision						3,300,000
Shoal Creek Mine
Other Commercial Events [Line Items]
Business interruption and property loss limits on insurance claim, amount						125,000,000
Provision for loss related to fire						28,700,000
Deductible amount						50,000,000
Shoal Creek Mine | Longwall and development and other costs
Other Commercial Events [Line Items]
Provision for loss related to fire						17,800,000
Shoal Creek Mine | Equipment deemed inoperable
Other Commercial Events [Line Items]
Provision for loss related to fire						$ 10,900,000