Peabody Energy (BTU) 10-Q 3 Nov 17 2017 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information shares in Millions	9 Months Ended
	Sep. 30, 2017shares
Entity Information [Line Items]
Entity Registrant Name	PEABODY ENERGY CORP
Entity Central Index Key	1,064,728
Document Type	10-Q
Document Period End Date	Sep. 30, 2017
Amendment Flag	false
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding	104.5

Unaudited Condensed Consolidate

Unaudited Condensed Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2017	Apr. 01, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Successor
Revenues
Sales	$ 1,264.2			$ 2,323.8
Other revenues	213			411.7
Total revenues	1,477.2			2,735.5
Costs and expenses
Operating costs and expenses (exclusive of items shown separately below)	1,044.9			1,979.7
Depreciation, depletion and amortization	194.5			342.8
Asset retirement obligation expenses	11.3			22.3
Selling and administrative expenses	33.4			67.8
Restructuring charges	1.1			1.1
Other operating (income) loss:
Net gain on disposal of assets	(0.4)			(0.9)
Asset impairment	0			0
(Income) loss from equity affiliates	(10.5)			(26.2)
Operating profit (loss)	202.9			348.9
Interest expense	(42.4)			(83.8)
Loss on early debt extinguishment	(12.9)			(12.9)
Interest income	(2)			(3.5)
Reorganization items, net	0			0
Income (loss) from continuing operations before income taxes	149.6			255.7
Income tax provision (benefit)	(84.1)			(79.4)
Income (loss) from continuing operations, net of income taxes	233.7			335.1
Loss from discontinued operations, net of income taxes	(3.7)			(6.4)
Net income (loss)	230			328.7
Less: Series A Convertible Preferred Stock dividends	23.5			138.6
Less: Net income attributable to noncontrolling interests	5.1			8.9
Net Income (Loss) Attributable to Common Stockholders	$ 201.4			$ 181.2
Loss from continuing operations:
Basic income (loss) per share (in dollars per share)	$ 1.51			$ 1.38
Diluted income (loss) per share (in dollars per share)	1.49			1.37
Net loss attributable to common stockholders:
Basic income (loss) per share (in dollars per share)	1.48			1.33
Diluted income (loss) per share (in dollars per share)	1.47			1.32
Dividends declared per share (in dollars per share)	$ 0			$ 0
Predecessor
Revenues
Sales		$ 1,081.4	$ 1,064		$ 2,835.9
Other revenues		244.8	143.1		438.6
Total revenues		1,326.2	1,207.1		3,274.5
Costs and expenses
Operating costs and expenses (exclusive of items shown separately below)		963.7	1,064.8		2,981.2
Depreciation, depletion and amortization		119.9	117.8		345.5
Asset retirement obligation expenses		14.6	12.7		37.3
Selling and administrative expenses		37.2	32.1		114.6
Restructuring charges		0	0.3		15.5
Other operating (income) loss:
Net gain on disposal of assets		(22.8)	(1.9)		(17.4)
Asset impairment		30.5	0		17.2
(Income) loss from equity affiliates		(15)	2.9		12.6
Operating profit (loss)		198.1	(21.6)		(232)
Interest expense		(32.9)	(58.5)		(243.7)
Loss on early debt extinguishment		0	0		0
Interest income		(2.7)	(1.3)		(4)
Reorganization items, net		627.2	29.7		125.1
Income (loss) from continuing operations before income taxes		(459.3)	(108.5)		(596.8)
Income tax provision (benefit)		(263.8)	(10.8)		(108.2)
Income (loss) from continuing operations, net of income taxes		(195.5)	(97.7)		(488.6)
Loss from discontinued operations, net of income taxes		(16.2)	(38.1)		(44.5)
Net income (loss)		(211.7)	(135.8)		(533.1)
Less: Series A Convertible Preferred Stock dividends		0	0		0
Less: Net income attributable to noncontrolling interests		4.8	1.8		3.5
Net Income (Loss) Attributable to Common Stockholders		$ (216.5)	$ (137.6)		$ (536.6)
Loss from continuing operations:
Basic income (loss) per share (in dollars per share)		$ (10.93)	$ (5.44)		$ (26.91)
Diluted income (loss) per share (in dollars per share)		(10.93)	(5.44)		(26.91)
Net loss attributable to common stockholders:
Basic income (loss) per share (in dollars per share)		(11.81)	(7.53)		(29.34)
Diluted income (loss) per share (in dollars per share)		(11.81)	(7.53)		(29.34)
Dividends declared per share (in dollars per share)		$ 0	$ 0		$ 0

Unaudited Condensed Consolidat3

Unaudited Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2017	Apr. 01, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Successor
Net income (loss)	$ 230			$ 328.7
Reclassification for realized losses on cash flow hedges (net of respective net tax provision of $0.0, $17.6, $0.0, $9.1 and $69.9) included in net income (loss)	0			0
Postretirement plans and workers’ compensation obligations (net of respective net tax provision of $0.0, $2.1, $0.0, $2.5 and $6.3)				0
Foreign currency translation adjustment	1.3			1.8
Other comprehensive income, net of income taxes	1.3			1.8
Comprehensive income (loss)	231.3			330.5
Less: Series A Convertible Preferred Stock dividends	23.5			138.6
Less: Comprehensive income attributable to noncontrolling interests	5.1			8.9
Comprehensive income (loss) attributable to common stockholders	$ 202.7			$ 183
Predecessor
Net income (loss)		$ (211.7)	$ (135.8)		$ (533.1)
Reclassification for realized losses on cash flow hedges (net of respective net tax provision of $0.0, $17.6, $0.0, $9.1 and $69.9) included in net income (loss)		18.6	29.9		119
Postretirement plans and workers’ compensation obligations (net of respective net tax provision of $0.0, $2.1, $0.0, $2.5 and $6.3)		4.4	3.6		10.8
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax		(4.4)
Foreign currency translation adjustment		5.5	1.5		2.4
Other comprehensive income, net of income taxes		28.5	35		132.2
Comprehensive income (loss)		(183.2)	(100.8)		(400.9)
Less: Series A Convertible Preferred Stock dividends		0	0		0
Less: Comprehensive income attributable to noncontrolling interests		4.8	1.8		3.5
Comprehensive income (loss) attributable to common stockholders		$ (188)	$ (102.6)		$ (404.4)

Unaudited Condensed Consolidat4

Unaudited Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2017	Apr. 01, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Successor
Reclassification for realized losses on cash flow hedges included in net income (loss), tax provision	$ 0			$ 0
Postretirement plans and workers' compensation obligations, tax provision	$ 0			$ 0
Predecessor
Reclassification for realized losses on cash flow hedges included in net income (loss), tax provision		$ 9.1	$ 17.6		$ 69.9
Postretirement plans and workers' compensation obligations, tax provision		$ 2.5	$ 2.1		$ 6.3

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Current liabilities
Liabilities subject to compromise		$ 8,440.2
Successor
Current assets
Cash and cash equivalents	$ 925
Restricted cash	7.8
Accounts receivable, net of allowance for doubtful accounts of $4.6 at September 30, 2017 and $13.1 at December 31, 2016	431
Inventories	307.7
Assets from coal trading activities, net	2.5
Other current assets	268.6
Total current assets	1,942.6
Property, plant, equipment and mine development, net	5,082.6
Restricted cash collateral	530.3
Investments and other assets	517.9
Total assets	8,073.4
Current liabilities
Current portion of long-term debt	47.1
Liabilities from coal trading activities, net	1
Accounts payable and accrued expenses	1,065
Total current liabilities	1,113.1
Long-term debt, less current portion	1,612
Deferred income taxes	2.2
Asset retirement obligations	636
Accrued postretirement benefit costs	745.8
Other noncurrent liabilities	573.7
Total liabilities not subject to compromise	4,682.8
Liabilities subject to compromise	0
Total liabilities	4,682.8
Stockholders’ equity
Additional paid-in capital	2,425.9
Treasury stock, at cost — 2.5 Successor common shares as of September 30, 2017 and 0.8 Predecessor common shares as of December 31, 2016	(69.2)
Retained earnings (accumulated deficit)	296.3
Accumulated other comprehensive income (loss)	1.8
Peabody Energy Corporation stockholders’ equity	3,347.5
Noncontrolling interests	43.1
Total stockholders’ equity	3,390.6
Total liabilities and stockholders’ equity	8,073.4
Successor | Preferred Stock
Stockholders’ equity
Total stockholders’ equity	691.7
Successor | Common Stock
Stockholders’ equity
Total stockholders’ equity	1
Successor | Convertible Preferred Stock
Stockholders’ equity
Preferred stock	691.7
Successor | Preferred Stock
Stockholders’ equity
Preferred stock	0
Successor | Series Common Stock
Stockholders’ equity
Common Stock	0
Successor | Common Stock
Stockholders’ equity
Common Stock	$ 1
Predecessor
Current assets
Cash and cash equivalents		872.3
Restricted cash		54.3
Accounts receivable, net of allowance for doubtful accounts of $4.6 at September 30, 2017 and $13.1 at December 31, 2016		473
Inventories		203.7
Assets from coal trading activities, net		0.7
Other current assets		486.6
Total current assets		2,090.6
Property, plant, equipment and mine development, net		8,776.7
Restricted cash collateral		529.3
Investments and other assets		381.1
Total assets		11,777.7
Current liabilities
Current portion of long-term debt		20.2
Liabilities from coal trading activities, net		1.2
Accounts payable and accrued expenses		990.4
Total current liabilities		1,011.8
Long-term debt, less current portion		0
Deferred income taxes		173.9
Asset retirement obligations		717.8
Accrued postretirement benefit costs		756.3
Other noncurrent liabilities		496.2
Total liabilities not subject to compromise		3,156
Liabilities subject to compromise		8,440.2
Total liabilities		11,596.2
Stockholders’ equity
Additional paid-in capital		2,422
Treasury stock, at cost — 2.5 Successor common shares as of September 30, 2017 and 0.8 Predecessor common shares as of December 31, 2016		(371.8)
Retained earnings (accumulated deficit)		(1,399.5)
Accumulated other comprehensive income (loss)		(477)
Peabody Energy Corporation stockholders’ equity		173.9
Noncontrolling interests		7.6
Total stockholders’ equity		181.5
Total liabilities and stockholders’ equity		11,777.7
Predecessor | Preferred Stock
Stockholders’ equity
Total stockholders’ equity		0
Predecessor | Common Stock
Stockholders’ equity
Total stockholders’ equity		0.2
Predecessor | Preferred Stock
Stockholders’ equity
Preferred stock		0
Predecessor | Predecessor Perpetual Preferred Stock — 0.8 shares authorized, no shares issued or outstanding as of December 31, 2016
Stockholders’ equity
Preferred stock		0
Predecessor | Series Common Stock
Stockholders’ equity
Common Stock		0
Predecessor | Common Stock
Stockholders’ equity
Common Stock		$ 0.2

Condensed Consolidated Balance6

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Millions, $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Successor
Current assets
Allowance for doubtful accounts	$ 4.6
Stockholders' equity
Treasury stock, shares (in shares)	2.5
Successor | Convertible Preferred Stock
Stockholders' equity
Preferred stock, par value per share (in dollars per share)	$ 0.01
Preferred stock, shares authorized (in shares)	50
Preferred stock, shares issued (in shares)	30
Preferred stock, shares outstanding (in shares)	15.9
Successor | Preferred Stock
Stockholders' equity
Preferred stock, par value per share (in dollars per share)	$ 0.01
Preferred stock, shares authorized (in shares)	50
Preferred stock, shares issued (in shares)	0
Preferred stock, shares outstanding (in shares)	0
Successor | Series Common Stock
Stockholders' equity
Common stock, par value per share (in dollars per share)	$ 0.01
Common stock, shares authorized (in shares)	50
Common stock, shares issued (in shares)	0
Common stock, shares outstanding (in shares)	0
Successor | Common Stock
Stockholders' equity
Common stock, par value per share (in dollars per share)	$ 0.01
Common stock, shares authorized (in shares)	450
Common stock, shares issued (in shares)	106
Common stock, shares outstanding (in shares)	102.7
Predecessor
Current assets
Allowance for doubtful accounts		$ 13.1
Stockholders' equity
Treasury stock, shares (in shares)		0.8
Predecessor | Preferred Stock
Stockholders' equity
Preferred stock, par value per share (in dollars per share)		$ 0.01
Preferred stock, shares authorized (in shares)		10
Preferred stock, shares issued (in shares)		0
Preferred stock, shares outstanding (in shares)		0
Predecessor | Perpetual Preferred Stock
Stockholders' equity
Preferred stock, shares authorized (in shares)		0.8
Preferred stock, shares issued (in shares)		0
Preferred stock, shares outstanding (in shares)		0
Predecessor | Series Common Stock
Stockholders' equity
Common stock, par value per share (in dollars per share)		$ 0.01
Common stock, shares authorized (in shares)		40
Common stock, shares issued (in shares)		0
Common stock, shares outstanding (in shares)		0
Predecessor | Common Stock
Stockholders' equity
Common stock, par value per share (in dollars per share)		$ 0.01
Common stock, shares authorized (in shares)		53.3
Common stock, shares issued (in shares)		19.3
Common stock, shares outstanding (in shares)		18.5

Unaudited Condensed Consolidat7

Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended	6 Months Ended	9 Months Ended
	Apr. 01, 2017	Sep. 30, 2017	Sep. 30, 2016
Successor
Cash Flows From Operating Activities
Net income (loss)		$ 328.7
Loss from discontinued operations, net of income taxes		6.4
Income (loss) from continuing operations, net of income taxes		335.1
Adjustments to reconcile income (loss) from continuing operations, net of income taxes to net cash provided by (used in) operating activities:
Depreciation, depletion and amortization		342.8
Noncash coal inventory revaluation		67.3
Noncash interest expense including loss on early debt extinguishment		21.8
Deferred income taxes		1.6
Noncash share-based compensation		14.1
Asset impairment		0
Net gain on disposal of assets		(0.9)
(Income) loss from equity affiliates		(26.2)
Gain on voluntary employee beneficiary association settlement		0
Foreign currency option contracts		(5.1)
Reclassification from other comprehensive earnings for terminated hedge contracts		0
Settlement of hedge positions		0
Noncash reorganization items, net		0
Changes in current assets and liabilities:
Accounts receivable		(118.9)
Change in receivable from accounts receivable securitization program		0
Inventories		(54.1)
Net assets from coal trading activities		(1.6)
Other current assets		(23.4)
Accounts payable and accrued expenses		(261)
Restricted cash		99.4
Asset retirement obligations		7.6
Workers’ compensation obligations		(1.1)
Accrued postretirement benefit costs		(1.2)
Accrued pension costs		(32.7)
Take-or-pay obligation settlement		0
Other, net		(18.8)
Net cash provided by (used in) continuing operations		344.7
Net cash used in discontinued operations		(14.4)
Net cash provided by (used in) operating activities		330.3
Cash Flows From Investing Activities
Additions to property, plant, equipment and mine development		(68.6)
Changes in accrued expenses related to capital expenditures		1.8
Federal coal lease expenditures		0
Proceeds from disposal of assets		5.2
Contributions to joint ventures		(210)
Distributions from joint ventures		208
Advances to related parties		(4.1)
Repayments of loans from related parties		35.2
Other, net		(2.4)
Net cash (used in) provided by investing activities		(34.9)
Cash Flows From Financing Activities
Proceeds from long-term debt		0
Successor Notes issuance proceeds into escrow		0
Repayments of long-term debt		(332.1)
Payment of deferred financing costs		(6.1)
Common stock repurchases		(69.2)
Distributions to noncontrolling interests		(16.7)
Other, net		0
Net cash (used in) provided by financing activities		(424.1)
Net change in cash and cash equivalents		(128.7)
Cash and cash equivalents at beginning of period		1,053.7
Cash and cash equivalents at end of period	$ 1,053.7	925
Predecessor
Cash Flows From Operating Activities
Net income (loss)	(211.7)		$ (533.1)
Loss from discontinued operations, net of income taxes	16.2		44.5
Income (loss) from continuing operations, net of income taxes	(195.5)		(488.6)
Adjustments to reconcile income (loss) from continuing operations, net of income taxes to net cash provided by (used in) operating activities:
Depreciation, depletion and amortization	119.9		345.5
Noncash coal inventory revaluation	0		0
Noncash interest expense including loss on early debt extinguishment	0.5		30
Deferred income taxes	(252.2)		(39.4)
Noncash share-based compensation	1.9		8.9
Asset impairment	30.5		17.2
Net gain on disposal of assets	(22.8)		(17.4)
(Income) loss from equity affiliates	(15)		12.6
Gain on voluntary employee beneficiary association settlement	0		(68.1)
Foreign currency option contracts	0		0
Reclassification from other comprehensive earnings for terminated hedge contracts	27.6		82
Settlement of hedge positions	0		(25)
Noncash reorganization items, net	569.3		96.5
Changes in current assets and liabilities:
Accounts receivable	159.3		24.4
Change in receivable from accounts receivable securitization program	0		(168.5)
Inventories	(47.2)		47.8
Net assets from coal trading activities	(0.5)		7.5
Other current assets	0.1		(28.6)
Accounts payable and accrued expenses	(64.9)		5.2
Restricted cash	(94.1)		(94.8)
Asset retirement obligations	10.2		19
Workers’ compensation obligations	(3.1)		(8.7)
Accrued postretirement benefit costs	0.8		(0.6)
Accrued pension costs	5.4		16.4
Take-or-pay obligation settlement	(5.5)		(15.5)
Other, net	(2.5)		(15.7)
Net cash provided by (used in) continuing operations	222.2		(257.9)
Net cash used in discontinued operations	(8.2)		(18.9)
Net cash provided by (used in) operating activities	214		(276.8)
Cash Flows From Investing Activities
Additions to property, plant, equipment and mine development	(32.8)		(56.6)
Changes in accrued expenses related to capital expenditures	(1.4)		(5.5)
Federal coal lease expenditures	(0.5)		(249)
Proceeds from disposal of assets	24.3		134.7
Contributions to joint ventures	(95.4)		(241.7)
Distributions from joint ventures	90.5		236.7
Advances to related parties	(0.4)		(23.3)
Repayments of loans from related parties	31.1		13.2
Other, net	(0.3)		(8.2)
Net cash (used in) provided by investing activities	15.1		(199.7)
Cash Flows From Financing Activities
Proceeds from long-term debt	1,000		1,429.8
Successor Notes issuance proceeds into escrow	(1,000)		0
Repayments of long-term debt	(2.1)		(11.2)
Payment of deferred financing costs	(45.4)		(29.8)
Common stock repurchases	0		0
Distributions to noncontrolling interests	(0.1)		(3.9)
Other, net	(0.1)		(1.9)
Net cash (used in) provided by financing activities	(47.7)		1,383
Net change in cash and cash equivalents	181.4		906.5
Cash and cash equivalents at beginning of period	872.3	$ 1,053.7	261.3
Cash and cash equivalents at end of period	$ 1,053.7		$ 1,167.8

Unaudited Condensed Consolidat8

Unaudited Condensed Consolidated Statement of Changes in Stockholders' Equity - USD ($) $ in Millions	Total	Series A Convertible Preferred Stock	Common Stock	Additional Paid-in Capital	Treasury Stock	(Accumulated Deficit) Retained Earnings	Accumulated Other Comprehensive (Loss) Income	Noncontrolling Interests
Beginning Balance (Predecessor) at Dec. 31, 2016	$ 181.5	$ 0	$ 0.2	$ 2,422	$ (371.8)	$ (1,399.5)	$ (477)	$ 7.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) | Predecessor	(211.7)					(216.5)		4.8
Net realized losses on cash flow hedges (net of $9.1 net tax provision) | Predecessor	18.6						18.6
Postretirement plans and workers’ compensation obligations (net of $2.5 net tax provision) | Predecessor	4.4						4.4
Foreign currency translation adjustment | Predecessor	5.5						5.5
Share-based compensation for equity-classified awards | Predecessor	1.9			1.9
Repurchase of employee common stock relinquished for tax withholding | Predecessor	(0.1)				(0.1)
Distributions to noncontrolling interests | Predecessor	(0.1)							(0.1)
Elimination of Predecessor equity | Predecessor	0		(0.2)	(2,423.9)	371.9	1,616	448.5	(12.3)
Ending Balance (Predecessor) at Apr. 01, 2017	0	0	0	0	0	0	0	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Successor equity | Successor	3,131.9	1,305.4	0.7	1,774.9	0	0	0	50.9
Ending Balance (Successor) at Apr. 02, 2017	3,131.9	1,305.4	0.7	1,774.9	0	0	0	50.9
Beginning Balance (Predecessor) at Apr. 01, 2017	0	0	0	0	0	0	0	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) | Successor	328.7					319.8		8.9
Foreign currency translation adjustment | Successor	1.8						1.8
Warrant conversions | Successor	0		0.1	(0.1)
Series A Convertible Preferred Stock conversions | Successor	0	(616.7)	0.2	640		(23.5)
Series A Convertible Preferred Stock dividends | Successor	0	3		(3)
Share-based compensation for equity-classified awards | Successor	14.1			14.1
Common stock repurchases | Successor					(69.2)
Distributions to noncontrolling interests | Successor	(16.7)							(16.7)
Ending Balance (Successor) at Sep. 30, 2017	$ 3,390.6	$ 691.7	$ 1	$ 2,425.9	$ (69.2)	$ 296.3	$ 1.8	$ 43.1

Unaudited Condensed Consolidat9

Unaudited Condensed Consolidated Statement of Changes in Stockholders' Equity (Parenthetical) - Predecessor $ in Millions	3 Months Ended
	Mar. 31, 2017USD ($)
Net realized losses on cash flow hedges, tax	$ 9.1
Postretirement plans and workers' compensation obligations, tax provision	$ 2.5

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2017
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 an unincorporated joint venture. In those cases, the Company includes its proportionate share in the assets, liabilities, revenues 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, 2016 , as amended on July 10, 2017 and August 14, 2017. In the opinion of management, these financial statements reflect all normal, recurring adjustments necessary for a fair presentation and certain prior year amounts have been reclassified for consistency with the current period presentation. Balance sheet information presented herein as of December 31, 2016 has been derived from the Company’s audited consolidated balance sheet at that date. The Company’s results of operations for the three months ended September 30, 2017 and the period April 2, 2017 through September 30, 2017 are not necessarily indicative of the results that may be expected for future quarters. The Company has classified items within discontinued operations in the unaudited condensed consolidated financial statements for disposals (by sale or otherwise) that have occurred prior to January 1, 2015 when the operations and cash flows of a disposed component of the Company were eliminated from the ongoing operations of the Company as a result of the disposal and the Company no longer had any significant continuing involvement in the operation of that component. Plan of Reorganization and Emergence from Chapter 11 Cases On April 13, 2016, (the Petition Date), PEC and a majority of its wholly owned domestic subsidiaries, as well as one international subsidiary in Gibraltar (collectively with PEC, the Debtors), filed voluntary petitions (the Bankruptcy Petitions) under Chapter 11 of Title 11 of the U.S. Code (the Bankruptcy Code) in the United States Bankruptcy Court for the Eastern District of Missouri (the Bankruptcy Court). The Debtors’ Chapter 11 cases (the Chapter 11 Cases) were jointly administered under the caption In re Peabody Energy Corporation, et al. , Case No. 16-42529. For periods subsequent to filing the Bankruptcy Petitions, the Company applied the Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) 852, “Reorganizations”, in preparing its consolidated financial statements. ASC 852 requires that financial statements distinguish transactions and events that are directly associated with the reorganization from the ongoing operations of the business. Accordingly, certain revenues, expenses, realized gains and losses and provisions for losses that were realized or incurred in the bankruptcy proceedings were recorded in “Reorganization items, net” in the unaudited condensed consolidated statements of operations. In addition, the pre-petition obligations that were impacted by the bankruptcy reorganization process were classified as “Liabilities subject to compromise” in the accompanying condensed consolidated balance sheet at December 31, 2016. On January 27, 2017, the Debtors filed with the Bankruptcy Court the Second Amended Joint Plan of Reorganization of Debtors and Debtors in Possession (as further modified, the Plan) and the Second Amended Disclosure Statement with Respect to the Second Amended Joint Plan of Reorganization of Debtors and Debtors in Possession (previous versions of the Plan and Disclosure Statement were filed with the Bankruptcy Court on December 22, 2016, January 25, 2017 and January 27, 2017). Subsequently, the Debtors solicited votes on the Plan. On March 15, 2017, the Debtors filed a revised version of the Plan and on March 16, 2017, the Bankruptcy Court held a hearing to determine whether the Plan should be confirmed. On March 17, 2017, the Bankruptcy Court entered an order, Docket No. 2763 (the Confirmation Order), confirming the Plan. On April 3, 2017, (the Effective Date), the Debtors satisfied the conditions to effectiveness set forth in the Plan, the Plan became effective in accordance with its terms and the Debtors emerged from the Chapter 11 Cases. On the Effective Date, in accordance with ASC 852, the Company applied fresh start reporting which requires the Company to allocate its reorganization value to the fair value of assets and liabilities in conformity with the guidance for the acquisition method of accounting for business combinations. The Company was permitted to use fresh start reporting because (i) the holders of existing voting shares of the Predecessor (as defined below) company received less than 50% of the voting shares of the emerging entity upon reorganization and (ii) the reorganization value of the Company’s assets immediately prior to Plan confirmation was less than the total of all postpetition liabilities and allowed claims. Upon adoption of fresh start reporting, the Company became a new entity for financial reporting purposes, reflecting the Successor (as defined below) capital structure. As a result, a new accounting basis in the identifiable assets and liabilities assumed was established with no retained earnings or accumulated other comprehensive income (loss) (OCI) for financial reporting purposes. The Company selected an accounting convenience date of April 1, 2017 for purposes of applying fresh start reporting as the activity between the convenience date and the Effective Date does not result in a material difference in the results. References to “Successor” in the financial statements and accompanying footnotes are in reference to reporting dates on or after April 2, 2017; references to “Predecessor” in the financial statements and accompanying footnotes are in reference to reporting dates through April 1, 2017 which includes the impact of the Plan provisions and the application of fresh start reporting. As such, the Company’s financial statements for the Successor will not be comparable in many respects to its financial statements for periods prior to the adoption of fresh start reporting and prior to the accounting for the effects of the Plan. For further information on the Plan and fresh start reporting, see Note 3. “Emergence from the Chapter 11 Cases and Fresh Start Reporting.” In connection with fresh start reporting, the Company made certain accounting policy elections that impact the Successor periods presented herein and will impact prospective periods. The Company will classify the amortization associated with its asset retirement obligation assets within “Depreciation, depletion and amortization” in its consolidated statements of operations, rather than within “Asset retirement obligation expenses”, as in Predecessor periods. With respect to its accrued postretirement benefit and pension obligations, the Company will prospectively record amounts attributable to prior service cost and actuarial valuation changes, as applicable, currently in earnings rather than recording such amounts within accumulated other comprehensive income and amortizing to expense over applicable time periods.

Emergence from the Chapter 11 C

Emergence from the Chapter 11 Cases and Fresh Start Reporting	9 Months Ended
	Sep. 30, 2017
Reorganizations [Abstract]
Emergence from the Chapter 11 Cases and Fresh Start Reporting	Emergence from the Chapter 11 Cases and Fresh Start Reporting The following is a summary of certain provisions of the Plan, as confirmed by the Bankruptcy Court pursuant to the Confirmation Order, and is not intended to be a complete description of the Plan, which is included in its entirety as Exhibit 2.2 of the Company’s Current Report on Form 8-K filed with the Securities and Exchange Commission (SEC) on March 20, 2017. The consummation of the Plan resulted in the following capital structure on the Effective Date: • Successor Notes - $1,000.0 million first lien senior secured notes • Successor Credit Facility - a first lien credit facility of $950.0 million • Series A Convertible Preferred Stock - $750.0 million for 30.0 million shares of Series A Convertible Preferred Stock • Common Stock and Warrants - $750.0 million for common stock and warrants issued in connection with a Rights Offering (as defined below), resulting in, together with other issuances of common stock, the issuance of 70.9 million shares of a single class of common stock and warrants to purchase 6.2 million shares of common stock The new debt and equity instruments comprising the Successor Company’s capital structure are further described below. Treatment of Classified Claims and Interests The following summarizes the various classes of claimants’ recoveries under the Plan. Undefined capitalized terms used in this section, Treatment of Classified Claims and Interests , are defined in the Plan. First Lien Lender Claims (Classes 1A - 1D) Paid in full in cash. Second Lien Notes Claims (Classes 2A - 2D) A combination of (1) $450 million of cash, first lien debt and/or new second lien notes and (2)(a) new common stock, par value $0.01 per share, of the Reorganized Peabody (Common Stock) and (b) subscription rights in the Rights Offering. Other Secured Claims (Classes 3A - 3E) At the election of the Debtors, (1) reinstatement, (2) payment in full in cash, (3) receipt of the applicable collateral or (4) such other treatment consistent with section 1129(b) of the Bankruptcy Code. Other Priority Claims (Classes 4A - 4E) Paid in full in cash. General Unsecured Claims Class 5A: Against Peabody Energy: a pro rata share of $5 million in cash plus an amount of additional cash (up to $2 million) not otherwise paid to holders of Convenience Claims. Class 5B: Against the Encumbered Guarantor Debtors: (1) Common Stock and subscription rights in the Rights Offering or (2) at the election of the claim holder, cash from a pool of $75 million in cash to be paid by the Debtors and the Reorganized Debtors into a segregated account in accordance with the terms set forth in the Plan. Class 5C: Against the Gold Fields Debtors: units in the Gold Fields Liquidating Trust. Class 5D: Against Peabody Holdings (Gibraltar) Limited: no recoveries. Class 5E: Against the Unencumbered Debtors: cash in the amount of such holder’s allowed claim, less any amounts attributable to late fees, postpetition interest or penalties. Convenience Claims Class 6A: Against Peabody Energy: up to 72.5% of such claim in cash, provided that total payments to Convenience Claims may not exceed $2 million. Class 6B: Against the Encumbered Guarantor Debtors: up to 72.5% of such claim in cash, provided that total payments to Convenience Claims may not exceed $18 million. United Mine Workers of America 1974 Pension Plan Claim (Classes 7A - 7E) $75 million in cash paid over five years. See Note 5. “Discontinued Operations,” for additional details. Unsecured Subordinated Debentures Claims (Class 8A) (1) Payment of the reasonable and documented fees and expenses of the trustee under the 2066 subordinated indenture up to $350,000; and (2) because this class voted in favor of the Plan and in connection with the settlement of certain potential intercreditor disputes as part of the global settlement embodied therein, and because the trustee under the 2066 subordinated indenture did not object to, and affirmatively supported, the Plan, holders of allowed Unsecured Subordinated Debenture Claims received from specified noteholder co-proponents their pro rata share of penny warrants exercisable for 1.0% of the fully diluted Reorganized Peabody common stock from the pool of penny warrants issued to the noteholder co-proponents under the Rights Offering and/or the terms of the Backstop Commitment Agreement (as defined below). Section 510(b) Claims (Class 10A) No recovery. Peabody Energy Equity Interests (Class 11A) No recovery, as further described under Cancellation of Prior Common Stock below. Cancellation of Prior Common Stock In accordance with the Plan and as previously disclosed, each share of the Company’s common stock outstanding prior to the Effective Date, including all options and warrants to purchase such stock, were extinguished, canceled and discharged, and each such share, option or warrant has no further force or effect as of the Effective Date. Furthermore, all of the Company’s equity award agreements under prior incentive plans, and the awards granted pursuant thereto, were extinguished, canceled and discharged and have no further force or effect as of the Effective Date. Issuance of Equity Securities Section 1145 Securities On the Effective Date and simultaneous with the cancellation of the prior common stock discussed above, in connection with the Company’s emergence from the Chapter 11 Cases and in reliance on the exemption from registration requirements of the Securities Act of 1933 (the Securities Act) provided by Section 1145 of the Bankruptcy Code, the Company issued: • 11.6 million shares of Common Stock to holders of Allowed Claims (as defined in the Plan) in Classes 2A, 2B, 2C, 2D and 5B on account of such claims as provided in the Plan; and • 51.2 million shares of Common Stock and 2.9 million Warrants (the 1145 Warrants) pursuant to the completed Rights Offering to certain holders of the Company’s prepetition indebtedness for total consideration of $704.4 million . Any shares of Common Stock issued pursuant to the exercise of such 1145 Warrants were similarly issued pursuant to the exemption from registration provided by Section 1145 of the Bankruptcy Code. Section 4(a)(2) Securities In addition, on the Effective Date, in connection with the Company’s emergence from the Chapter 11 Cases and in reliance on the exemption from registration requirements of the Securities Act provided by Section 4(a)(2) of the Securities Act, the Company issued: • 30.0 million shares of Series A Convertible Preferred Stock (the Preferred Stock) to parties to the Private Placement Agreement, dated as of December 22, 2016 (as amended, the Private Placement Agreement), among the Company and the other parties thereto, for total consideration of $750.0 million ; • 3.3 million shares of Common Stock and 0.2 million Warrants (the Private Warrants, and together with the 1145 Warrants, the Warrants) to parties to the Backstop Commitment Agreement, dated as of December 22, 2016 (as amended, the Backstop Commitment Agreement), among the Company and the other parties thereto, on account of their commitments under that agreement, for total consideration of $45.6 million ; and • 4.8 million shares of Common Stock and 3.1 million additional Private Warrants to specified parties to the Private Placement Agreement and Backstop Commitment Agreement on account of commitment premiums contemplated by those agreements. Any shares of Common Stock issued pursuant to the conversion of the Preferred Stock or the exercise of such Private Warrants have been or will be issued pursuant to the exemption from registration provided by Section 3(a)(9) and/or Section 4(a)(2) of the Securities Act. The securities issued in reliance on Section 4(a)(2) of the Securities Act were subject to restrictions on transfer; however, substantially all such shares were registered with the SEC on a resale Form S-1 effective July 14, 2017. Current Equity Structure During the three months ended September 30, 2017, the Company made repurchases of approximately 2.5 million shares of its Common Stock pursuant to its share repurchase program, as described in Note 16. “Other Events”. As of September 30, 2017 , the Company would have approximately 134.8 million shares of Common Stock outstanding, assuming full conversion of the Preferred Stock (including make-whole shares issuable upon conversion of the Preferred Stock). This amount excludes approximately 3.5 million shares of Common Stock which underlie unvested equity awards granted under the 2017 Incentive Plan (as defined below). Other Forms of Equity Authorized under the Company’s Certificate of Incorporation As noted on the accompanying condensed consolidated balance sheets, the Company’s Fourth Amended and Restated Certificate of Incorporation authorizes the issuances of additional series of preferred stock, as well as series common stock. Other than the Series A Convertible Preferred Stock, no other series of preferred stock is outstanding as of September 30, 2017 . Additionally, as of September 30, 2017 , no series common stock is outstanding. A copy of the Company’s Fourth Amended and Restated Certificate of Incorporation is included as Exhibit 3.1 to the Company’s Current Report on Form 8-K filed by the Company with the SEC on April 3, 2017. Preferred Stock The Preferred Stock accrues dividends at a rate of 8.5% per year, payable in-kind semi-annually on April 30 and October 31 of each year as additional shares of Series A Convertible Preferred Stock, and may be converted into a number of shares of Common Stock as described below. The Preferred Stock will also participate on an as-converted basis (giving effect to any accrued and unpaid dividends) in any dividend, distribution or payments to holders of Common Stock. Upon the Company’s liquidation, dissolution or wind up, whether voluntarily or involuntarily, the holders of Preferred Stock are granted a liquidation preference of $25.00 per share of Preferred Stock, plus any accrued but unpaid dividends through the date of liquidation. The Preferred Stock may also participate on an as-converted basis in any payments upon liquidation payable to the holders of Common Stock. The Preferred Stock shall be convertible into Common Stock at any time, at the option of the holders at an initial conversion price of $16.25 , representing a discount of 35% to the equity value assigned to the Common Stock by the Plan (subject to customary anti-dilution adjustments, the Conversion Price). If at any time following the Effective Date, less than 7,500,000 shares of Preferred Stock remain outstanding, then the Company shall have the right, but not the obligation, to redeem all (but not less than all) of the remaining shares of Preferred Stock, following thirty days’ notice, and on no more than 60 days’ notice, at a redemption price equal to $25.00 per share of Preferred Stock, payable in cash or shares of Common Stock at the Company’s election, subject to certain adjustments; provided that the Company shall not redeem any shares of Preferred Stock for cash during any time that any obligations under the Successor Credit Agreement (as defined below) remain outstanding. At any time following the Effective Date, if holders of at least 66 2/3% of the outstanding Preferred Stock elect to convert, then all remaining outstanding Preferred Stock will automatically convert at the same time and on the same terms. In addition, beginning on the Effective Date, each outstanding share of Preferred Stock shall automatically convert into a number of shares of Common Stock at the Conversion Price (such conversion, the Mandatory Conversion) if the volume weighted average price of the Common Stock exceeds $32.50 (the Conversion Threshold) for at least 45 trading days in a 60 consecutive trading day period, including each of the last 20 days in such 60 consecutive trading day period (such period, the Mandatory Conversion Period). Finally, the Preferred Stock shall automatically convert into shares of Common Stock immediately prior to the consummation of a Fundamental Change (generally defined as significant business combinations, as fully defined in the Certificate of Designation of Series A Convertible Preferred Stock included as Exhibit 3.2 to the Company’s Current Report on Form 8-K filed with the SEC on April 3, 2017) if either (1) at consummation of the Fundamental Change, the price of the Common Stock exceeds the Conversion Threshold, or (2) the consideration payable in the Fundamental Change per share of Common Stock exceeds the Conversion Threshold and is payable in cash. Upon any optional or mandatory conversion of the Preferred Stock that occurs on or prior to the three year anniversary of its initial issuance, holders of the Preferred Stock will be deemed to have (1) received dividends through the last payment of dividends prior to the conversion, including dividends received on prior dividends, to the extent accrued and not previously paid; and (2) dividends on the shares of Preferred Stock then outstanding and any shares deemed issued pursuant to the preceding clause accruing from the last dividend date preceding the date of the conversion through, but not including, the three year anniversary of their initial issuance, and all dividends on prior dividends. In respect of an optional or mandatory conversion occurring after the three year anniversary of its initial issuance, there shall be deemed to have been issued in respect of all shares of Preferred Stock at the time outstanding (1) dividends through the date of payment of the dividend immediately preceding the date of the conversion, including dividends on such dividends, to the extent accrued and not previously paid, and (2) dividends on (a) the shares of Preferred Stock at the time outstanding and (b) any shares of Preferred Stock deemed issued pursuant to the preceding clause (1) accruing from the date of payment of the dividend immediately preceding the conversion, through, but not including, the date of conversion and all dividends on such dividends. There are no restrictions on the repurchase or redemption of the Preferred Stock while there is any arrearage in the payment of dividends. The Preferred Stock votes with the Common Stock as a single class on an as-converted basis on all matters submitted to a vote of the holders of Common Stock with the exception of certain matters, as outlined in the Certificate of Designation of Series A Convertible Preferred Stock, in which the holders of Preferred Stock are entitled to vote as a separate class with a majority vote required for approval. Such matters include any Fundamental Change requiring approval of the holders of Common Stock and authorization of cash dividends on Common Stock in excess of $100 million payable in any 12-month period. Rights Offering Pursuant to the Plan and Rights Offering, holders of Allowed Claims in Classes 2A, 2B, 2C, 2D and 5B were offered the opportunity to purchase up to 54.5 million units, each unit being comprised of (1) one share of Common Stock and (2) a fraction of a Warrant. The purchase price for the units offered in the Rights Offering was $13.75 per unit. A total of 51.2 million units were purchased in the Rights Offering. Pursuant to the Backstop Commitment Agreement, the remaining 3.3 million units that were not purchased in the Rights Offering were purchased by the parties to the Backstop Commitment Agreement at the same per-unit price. Registration Rights Agreement On the Effective Date, the Company entered into a registration rights agreement (Registration Rights Agreement) with certain parties (together with any person or entity that becomes a party to the Registration Rights Agreement, the Holders) that received shares of the Company’s Common Stock and Preferred Stock in the Company on the Effective Date, as provided in the Plan. The Registration Rights Agreement provides Holders with registration rights for the Holders’ Registrable Securities (as defined in the Registration Rights Agreement). Substantially all of the Holders’ Registrable Securities were registered with the SEC on Form S-1 effective July 14, 2017. The registration rights are subject to certain conditions and limitations, including the right of the underwriters to limit the number of shares to be included in an underwritten offering and the Company’s right to delay or withdraw a registration statement under certain circumstances. A copy of the Registration Rights Agreement is included as Exhibit 10.1 to the Current Report on Form 8-K filed by the Company with the SEC on April 3, 2017. Warrant Agreement On the Effective Date, the Company entered into a warrant agreement (the Warrant Agreement) with American Stock Transfer and Trust Company, LLC. In accordance with the Plan, the Company issued 6.2 million warrants to purchase one share of Common Stock each at an exercise price of $0.01 per share to all Noteholder Co-Proponents (as defined in the Plan) and subscribers in the Rights Offering (as defined in the Plan) and related backstop commitment. All Warrants described above under the heading Issuance of Equity Securities were issued under the Warrant Agreement. All unexercised Warrants expired, and the rights of the holders of such Warrants to purchase Common Stock terminated on July 3, 2017, with less than 0.1% of the Warrants unexercised. A copy of the Warrant Agreement is included as Exhibit 4.1 to the Current Report on Form 8-K filed by the Company with the SEC on April 3, 2017. 6.000% and 6.375% Senior Secured Notes (collectively, the Successor Notes) On February 15, 2017, one of PEC’s subsidiaries entered into an indenture with Wilmington Trust, National Association, as trustee, relating to the issuance by PEC’s subsidiary of $500.0 million aggregate principal amount of 6.000% senior secured notes due 2022 (the 2022 Notes) and $500.0 million aggregate principal amount of 6.375% senior secured notes due 2025 (together with the 2022 Notes, the Successor Notes). The Successor Notes were sold on February 15, 2017 in a private transaction exempt from the registration requirements of the Securities Act. Prior to the Effective Date, PEC’s subsidiary deposited the proceeds of the offering of the Successor Notes into an escrow account pending confirmation of the Plan and certain other conditions being satisfied. On the Effective Date, the proceeds from the Successor Notes were used to repay the predecessor first lien obligations. The Successor Notes are further described in Note 13. “Long-term Debt” and copies of the indenture documents underlying the Successor Notes are incorporated as Exhibit 4.3 to the Current Report on Form 8-K filed by the Company with the SEC on April 3, 2017. Successor Credit Agreement In connection with an exit facility commitment letter, on the Effective Date, the Company entered into a credit agreement, dated as of April 3, 2017, among the Company, as Borrower, Goldman Sachs Bank USA, as Administrative Agent, and other lenders party thereto (the Successor Credit Agreement). The Successor Credit Agreement originally provided for a $950.0 million senior secured term loan, which matures in 2022 and prior to the amendment described in Note 13. “Long-term Debt,” bore interest at LIBOR plus 4.50% per annum with a 1.00% LIBOR floor. Following the amendment the loan bears interest at LIBOR plus 3.50% per annum with a 1.00% LIBOR floor. On the Effective Date, the proceeds from the Successor Credit Agreement were used to repay the predecessor first lien obligations. The Successor Credit Agreement and the amendment are further described in Note 13. “Long-term Debt.” A copy of the Successor Credit Agreement is included as Exhibit 10.3 to the Current Report on Form 8-K filed by the Company with the SEC on April 3, 2017 and a copy of the amendment is included as Exhibit 10.1 to the Current Report on Form 8-K filed by the Company on September 18, 2017. Securitization Facility In connection with a receivables securitization program commitment letter, on the Effective Date, the Company entered into the Sixth Amended and Restated Receivables Purchase Agreement, as amended, dated as of April 3, 2017 (Receivables Purchase Agreement), among P&L Receivables Company, LLC (P&L Receivables), as the Seller, the Company, as the Servicer, the sub-servicers party thereto, the various purchasers and purchaser agents party thereto and PNC Bank, National Association (PNC), as administrator. The Receivables Purchase Agreement extends the receivables securitization facility previously in place and expands that facility to include certain receivables from the Company’s Australian operations. The Receivables Purchase Agreement is further described in Note 18. “Financial Instruments and Other Guarantees” and a copy of the Receivables Purchase Agreement is included as Exhibit 10.4 to the Current Report on Form 8-K filed by the Company with the SEC on April 3, 2017. Cancellation of Prepetition Obligations In accordance with the Plan, on the Effective Date all of the obligations of the Debtors with respect to the following debt instruments were canceled: • Indenture governing $1,000.0 million outstanding aggregate principal amount of the Company’s 10.00% Senior Secured Second Lien Notes due 2022, dated as of March 16, 2015, among the Company, U.S. Bank National Association (U.S. Bank), as trustee and collateral agent, and the guarantors named therein, as supplemented; • Indenture governing $650.0 million outstanding aggregate principal amount of the Company’s 6.50% Senior Notes due 2020, dated as of March 19, 2004, among the Company, U.S. Bank, as trustee, and the guarantors named therein, as supplemented; • Indenture governing $1,518.8 million outstanding aggregate principal amount of the Company’s 6.00% Senior Notes due 2018, dated as of November 15, 2011, among the Company, U.S. Bank, as trustee, and the guarantors named therein, as supplemented; • Indenture governing $1,339.6 million outstanding aggregate principal amount of the Company’s 6.25% Senior Notes due 2021, dated as of November 15, 2011, by and among the Company, U.S. Bank, as trustee, and the guarantors named therein, as supplemented; • Indenture governing $250.0 million outstanding aggregate principal amount of the Company’s 7.875% Senior Notes due 2026, dated as of March 19, 2004, among the Company, U.S. Bank, as trustee, and the guarantors named therein, as supplemented; • Subordinated Indenture governing $732.5 million outstanding aggregate principal amount of the Company’s Convertible Junior Subordinated Debentures due 2066, dated as of December 20, 2006, among the Company and U.S. Bank, as trustee, as supplemented; and • Amended and Restated Credit Agreement, as amended and restated as of September 24, 2013 (the 2013 Credit Facility), related to $1,170.0 million outstanding aggregate principal amount of term loans under a term loan facility (the 2013 Term Loan Facility) and $1,650.0 million under a revolving credit facility (the 2013 Revolver), which includes approximately $675.0 million of posted but undrawn letters of credit and approximately $947.0 million in outstanding borrowings, by and among the Company, Citibank, N.A., as administrative agent, swing line lender and letter of credit issuer, Citigroup Global Markets, Inc., Merrill Lynch, Pierce, Fenner & Smith Incorporated, BNP Paribas Securities Corp., Crédit Agricole Corporate and Investment Bank, HSBC Securities (USA) Inc., Morgan Stanley Senior Funding, Inc., PNC Capital Markets LLC and RBS Securities Inc., as joint lead arrangers and joint book managers, and the lender parties thereto, as amended by that certain Omnibus Amendment Agreement, dated as of February 5, 2015. 2017 Incentive Compensation Plan In accordance with the Plan, the Peabody Energy Corporation 2017 Incentive Plan (the 2017 Incentive Plan) became effective as of the Effective Date. The 2017 Incentive Plan is intended to, among other things, help attract and retain employees and directors upon whom, in large measure, the Company depends for sustained progress, growth and profitability. The 2017 Incentive Plan also permits awards to consultants. Unless otherwise determined by the Board, the compensation committee of the Board will administer the 2017 Incentive Plan. The 2017 Incentive Plan generally provides for the following types of awards: • options (including non-qualified stock options and incentive stock options); • stock appreciation rights; • restricted stock; • restricted stock units; • deferred stock; • performance units; • dividend equivalents; and • cash incentive awards. The aggregate number of shares of Common Stock reserved for issuance pursuant to the 2017 Incentive Plan is 14.1 million . The 2017 Incentive Plan will remain in effect, subject to the right of the Board to terminate the 2017 Incentive Plan at any time, subject to certain restrictions, until the earlier to occur of (a) the date all shares of Common Stock subject to the 2017 Incentive Plan are purchased or acquired and the restrictions on all restricted stock granted under the 2017 Incentive Plan have lapsed, according to the 2017 Incentive Plan’s provisions, and (b) ten years from the Effective Date. Reorganization Value Fresh start reporting provides, among other things, for a determination of the value to be assigned to the equity of the emerging company as of a date selected for financial reporting purposes. In conjunction with the bankruptcy proceedings, a third-party financial advisor provided an enterprise value of the Company of approximately $4.2 billion to $4.9 billion . The final equity value of $3,081.0 million was based upon the approximate low end of the enterprise value established by the third-party valuation and cash held by the Successor company in connection with the emergence from the Chapter 11 Cases, less the fair value of Successor debt issued on the Effective Date as described above. The final equity value equated to a per share value of $22.03 per equivalent common share issued in accordance with the Plan. The enterprise value of the Company was estimated using two primary valuation methods: a comparable public company analysis and a discounted cash flow (DCF) analysis. The comparable public company analysis is based on the enterprise value of selected publicly traded companies that have operating and financial characteristics comparable in certain respects to the Company, for example, operational requirements and risk and profitability characteristics. Selected companies were comprised of coal mining companies with primary operations in the United States. Under this methodology, certain financial multiples and ratios that measure financial performance and value were calculated for each selected company and then applied to the Company’s financials to imply an enterprise value for the Company. The DCF analysis is a forward-looking enterprise valuation methodology that estimates the value of an asset or business by calculating the present value of expected future cash flows by that asset or business. The basis of the DCF analysis was the Company’s prepared projections which included a variety of estimates and assumptions, such as pricing and demand for coal. The Company’s pricing was based on its view of the market taking into account third-party forward pricing curves adjusted for the quality of products sold by the Company. While the Company considers such estimates and assumptions reasonable, they are inherently subject to significant business, economic and competitive uncertainties, many of which are beyond the Company’s control and, therefore, may not be realized. Changes in these estimates and assumptions may have a significant effect on the determination of the Company’s enterprise value. The assumptions used in the calculations for the DCF analysis included projected revenue, cost and cash flows for the nine months ending December 31, 2017 through each respective mine life and represented the Company’s best estimates at the time the analysis was prepared. The DCF analysis was completed using discount rates ranging from 11% to 14% . The DCF analysis involves complex considerations and judgments concerning appropriate discount rates. Due to the unobservable inputs to the valuation, the fair value would be considered Level 3 in the fair value hierarchy. Grant of Emergence Awards On the Effective Date, the Company granted restricted stock units under the 2017 Incentive Plan and the terms of the relevant restricted stock unit agreement to all employees, including its executive officers (the Emergence Awards). The fair value of the Emergence Awards on the Effective Date was $80.0 million . The Emergence Awards granted to the Company’s executive officers generally will vest ratably on each of the first three anniversaries of the Effective Date, subject to, among other things, each such executive officer’s continued employment with the Company. The Emergence Awards will become fully vested upon each such executive officer’s termination of employment by the Company and its subsidiaries without Cause or by the executive for Good Reason (each, as defined in the 2017 Incentive Plan or award agreement) or due to a termination of employment with the Company and its subsidiaries by reason of death or Disability (as defined in the 2017 Incentive Plan or award agreement). In order to receive the Emergence Awards, the executive officers were required to execute restrictive covenant agreements protecting the Company’s interests. Copies of the 2017 Incentive Plan and related documents are included as Exhibits 10.7 and 10.8 to the Current Report on Form 8-K filed by the Company with the SEC on April 3, 2017. Effect of Plan and Fresh Start Reporting Adjustments The following balance sheet illustrates the impacts of the implementation of the Plan and the application of fresh start reporting, which results in the opening balance sheet of the Successor company. As of April 1, 2017 Predecessor (a) Effect of Plan (b) Fresh Start Adjustments (c) Successor (Dollars in millions) ASSETS Current assets Cash and cash equivalents $ 1,068.1 $ (14.4 ) (d) $ — $ 1,053.7 Restricted cash 80.7 (54.7 ) (d) — 26.0 Successor Notes issuance proceeds - restricted cash 1,000.0 (1,000.0 ) (d) — — Accounts receivable, net 312.1 — — 312.1 Inventories 250.8 — 70.1 (k) 320.9 Assets from coal trading activities, net 0.6 — — 0.6 Other current assets 493.9 (18.1 ) (e) (333.0 ) (l) 142.8 Total current assets 3,206.2 (1,087.2 ) (262.9 ) 1,856.1 Property, plant, equipment and mine development, net 8,653.9 — (3,461.4 ) (m) 5,192.5 Investments and other assets 976.4 3.9 (f) 238.0 (n) 1,218.3 Total assets $ 12,836.5 $ (1,083.3 ) $ (3,486.3 ) $ 8,266.9 LIABILITIES AND STOCKHOLDERS’ EQUITY Current liabilities Current portion of long-term debt $ 18.2 $ 9.5 (g) $ — $ 27.7 Liabilities from coal trading activities, net 0.7 — — 0.7 Accounts payable and accrued expenses 967.3 257.6 (h) 14.8 (o) 1,239.7 Total current liabilities 986.2 267.1 14.8 1,268.1 Long-term debt, less current portion 950.5 903.2 (g) — 1,853.7 Deferred income taxes 179.2 — (177.8 ) (p) 1.4 Asset retirement obligations 707.0 — (73.9 ) (q) 633.1 Accrued postretirement benefit costs 753.9 — (6.9 ) (r) 747.0 Other noncurrent liabilities 511.1 — 120.6 (s) 631.7 Total liabilities not subject to compromise 4,087.9 1,170.3 (123.2 ) 5,135.0 Liabilities subject to compromise 8,416.7 (8,416.7 ) (i) — — Total liabilities 12,504.6 (7,246.4 ) (123.2 ) 5,135.0 Stockholders’ equity Common Stock (Predecessor) 0.2 (0.2 ) (j) — — Common Stock (Successor) — 0.7 (b) — 0.7 Series A Preferred Stock (Successor) — 1,305.4 (b) — 1,305.4 Additional paid-in capital (Predecessor) 2,423.9 (2,423.9 ) (j) — — Additional paid-in capital (Successor) — 1,774.9 (b) — 1,774.9 Treasury stock, at cost (371.9 ) 371.9 (j) — — Accumulated deficit (1,284.1 ) 5,134.3 (j) (3,850.2 ) (t) — Accumulated other comprehensive loss (448.5 ) — 448.5 (t) — Peabody Energy Corporation stockholders’ equity 319.6 6,163.1 (3,401.7 ) 3,081.0 Noncontrolling interests 12.3 — 38.6 (u) 50.9 Total stockholders’ equity 331.9 6,163.1 (3,363.1 ) 3,131.9 Total liabilities and stockholders’ equity $ 12,836.5 $ (1,083.3 ) $ (3,486.3 ) $ 8,266.9 (a) Represents the Predecessor consolidated balance sheet at April 1, 2017. (b) Represents amounts recorded for the implementation of the Plan on the Effective Date. This includes the settlement of liabilities subject to compromise through a combination of cash payments, the issuance of new common stock and warrants and the issuance of new debt. The following is the calculation of the total pre-tax gain on the settlement

Newly Adopted Accounting Standa

Newly Adopted Accounting Standards and Accounting Standards Not Yet Implemented	9 Months Ended
	Sep. 30, 2017
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Newly Adopted Accounting Standards and Accounting Standards Not Yet Implemented	Newly Adopted Accounting Standards and Accounting Standards Not Yet Implemented Newly Adopted Accounting Standards Inventory. In July 2015, the FASB issued guidance which requires entities to measure most inventory “at the lower of cost and net realizable value”, thereby simplifying the current guidance under which an entity must measure inventory at the lower of cost or market (market in this context is defined as one of three different measures, one of which is net realizable value). The guidance does not apply to inventories that are measured by using either the last-in, first-out method or the retail inventory method. The new guidance became effective prospectively for annual periods beginning after December 15, 2016 (January 1, 2017 for the Company). There was no material impact to the Company’s results of operations, financial condition, cash flows or financial statement presentation in connection with the adoption of the guidance. Compensation - Stock Compensation. In March 2016, the FASB issued accounting guidance which identifies areas for simplification involving several aspects of accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, an option to recognize gross stock compensation expense with actual forfeitures recognized as they occur, as well as certain classifications on the statement of cash flows. The new guidance was effective prospectively for annual periods beginning after December 15, 2016 and interim periods therein, with early adoption permitted. The Company elected early adoption of this guidance effective December 31, 2016. There was no material impact to the Company’s results of operations, financial condition, cash flows or financial statement presentation in connection with the adoption of the guidance. Accounting Standards Not Yet Implemented Revenue Recognition. In May 2014, the FASB issued a comprehensive revenue recognition standard that will supersede nearly all existing revenue recognition guidance under U.S. GAAP. The new standard provides a single principles-based, five-step model to be applied to all contracts with customers, which steps are to (1) identify the contract(s) with the customer, (2) identify the performance obligations in the contract, (3) determine the transaction price, (4) allocate the transaction price to the performance obligations in the contract and (5) recognize revenue when each performance obligation is satisfied. More specifically, revenue will be recognized when promised goods or services are transferred to the customer in an amount that reflects the consideration expected in exchange for those goods or services. The standard also requires entities to disclose sufficient qualitative and quantitative information to enable financial statement users to understand the nature, amount, timing and uncertainty of revenues and cash flows arising from contracts with customers. The new standard will be effective for interim and annual periods beginning after December 15, 2017 (January 1, 2018 for the Company), with early adoption permitted. The standard allows for either a full retrospective adoption or a modified retrospective adoption. The Company’s primary source of revenue is from the sale of coal through both short-term and long-term contracts with utilities, industrial customers and steel producers whereby revenue is currently recognized when risk of loss has passed to the customer. Upon adoption of this new standard, the Company believes that the timing of revenue recognition related to its coal sales will remain consistent with its current practice. The Company has reviewed its portfolio of coal sales contracts and the various terms and clauses within each contract and believes it is unlikely that its revenue recognition policies for such contracts will be materially impacted by the standard. The Company is also evaluating other revenue streams to determine the potential impact related to the adoption of the standard, as well as potential disclosures required by the standard. The Company plans to adopt the standard under the modified retrospective approach. Lease Accounting. In February 2016, the FASB issued accounting guidance that will require a lessee to recognize on its balance sheet a liability to make lease payments and a right-of-use asset representing its right to use the underlying asset for the lease term for leases with lease terms of more than 12 months. Consistent with current U.S. GAAP, the recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee primarily will depend on its classification as a finance or operating lease. Additional qualitative disclosures along with specific quantitative disclosures will also be required. The new guidance will take effect for public companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018 (January 1, 2019 for the Company), with early adoption permitted. Upon adoption, the Company will be required to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach. The Company is in the process of evaluating the impact that the adoption of this guidance will have on its results of operations, financial condition, cash flows and financial statement presentation. Financial Instruments - Credit Losses. In June 2016, the FASB issued accounting guidance related to the measurement of credit losses on financial instruments. The pronouncement replaces the incurred loss methodology to record credit losses with a methodology that reflects the expected credit losses for financial assets not accounted for at fair value with gains and losses recognized through net income. This standard is effective for fiscal years beginning after December 15, 2019 (January 1, 2020 for the Company) and interim periods therein, with early adoption permitted for fiscal years, and interim periods therein, beginning after December 15, 2018. The Company is in the process of evaluating the impact that the adoption of this guidance will have on its results of operations, financial condition, cash flows and financial statement presentation. Classification of Certain Cash Receipts and Cash Payments. In August 2016, the FASB issued accounting guidance to amend the classification of certain cash receipts and cash payments in the statement of cash flows to reduce diversity in practice. The new guidance will be effective for fiscal years beginning after December 15, 2017 (January 1, 2018 for the Company) and interim periods therein, with early adoption permitted. The amendments in the classification should be applied retrospectively to all periods presented, unless deemed impracticable, in which case, prospective application is permitted. The Company is currently evaluating this guidance and its impact on classification of certain cash receipts and cash payments in the Company’s statements of cash flows. Restricted Cash. In November 2016, the FASB issued accounting guidance which will reduce diversity in the presentation of restricted cash and restricted cash equivalents in the statement of cash flows. The new guidance will be effective retrospectively for fiscal years beginning after December 15, 2017 (January 1, 2018 for the Company) and interim periods therein, with early adoption permitted. The Company is currently evaluating this guidance and its impact on the Company’s statements of cash flows. Compensation - Retirement Benefits. In March 2017, the FASB issued accounting guidance which requires employers that sponsor defined benefit pension and other postretirement plans to disaggregate the service cost component from other components of net periodic benefit costs and to disclose the amounts of net periodic benefit costs that are included in each income statement line item. The standard requires employers to report the service cost component in the same line item as other compensation costs and to report the other components of net periodic benefit costs (which include interest costs, expected return on plan assets, amortization of prior service cost or credits and actuarial gains and losses) separately and outside a subtotal of operating income. The new guidance will be effective retrospectively for fiscal years beginning after December 15, 2017 (January 1, 2018 for the Company) and interim periods therein, with early adoption permitted. The Company is currently evaluating the impact that the adoption of this guidance will have on its results of operations, financial condition, cash flows and financial statement presentation. Derivatives and Hedging. In August 2017, the FASB issued accounting guidance to amend the hedge accounting rules to simplify the application of hedge accounting guidance and better align the recognition and presentation of the effects of the hedging instrument and the hedged item in the financial statements. The guidance expands the ability to hedge nonfinancial and financial risk components, reduces complexity in fair value hedges of interest rate risk, eliminates the requirement to separately measure and report hedge ineffectiveness, as well as eases certain hedge effectiveness assessment requirements. The new guidance will be effective for fiscal years beginning after December 15, 2018 (January 1, 2019 for the Company) and interim periods therein, with early adoption permitted. The amendments to cash flow and net investment hedge relationships that exist on the date of adoption will be applied using a modified retrospective approach. The presentation and disclosure requirements will be applied prospectively. The Company is currently evaluating the impact that the adoption of this guidance will have on its results of operations, financial condition, cash flows and financial statement presentation.

Asset Impairment

Asset Impairment	9 Months Ended
	Sep. 30, 2017
Asset Impairment Charges [Abstract]
Asset Impairment	Asset Impairment The Company’s mining and exploration assets and mining-related investments may be adversely affected by numerous factors that may cause the Company to be unable to recover all or a portion of the carrying value of those assets. As a result of various unfavorable conditions, including but not limited to sustained trends of weakness in U.S. and international seaborne coal market pricing and certain asset-specific factors, the Company recognized aggregate impairment charges of $247.9 million during the year ended December 31, 2016 , which included $17.2 million during the first nine months of 2016 to write down certain targeted divestiture assets in Queensland, Australia. For additional information surrounding those charges, refer to Note 4. “Asset Impairment” to the consolidated financial statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 , as amended on July 10, 2017 and August 14, 2017. The Company generally does not view short-term declines subsequent to previous impairment assessments in thermal and metallurgical coal prices in the markets in which it sells its products as an indicator of impairment. However, the Company generally views a sustained trend (for example, over periods exceeding one year) of adverse coal market pricing or unfavorable changes thereto as a potential indicator of impairment. Because of the volatile and cyclical nature of U.S. and international seaborne coal markets, it is reasonably possible that prices in those market segments may decrease and/or fail to improve in the near term, which, absent sufficient mitigation such as an offsetting reduction in the Company’s operating costs, may result in the need for future adjustments to the carrying value of the Company’s long-lived mining assets and mining-related investments. During the period January 1 through April 1, 2017 , the Company recognized impairment charges of $30.5 million related to terminated coal lease contracts in the Midwestern United States.

Discontinued Operations

Discontinued Operations	9 Months Ended
	Sep. 30, 2017
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	Discontinued Operations Discontinued operations include certain former Australian Thermal Mining and Midwestern U.S. Mining segment assets that have ceased production and other previously divested legacy operations, including Patriot Coal Corporation and certain of its wholly-owned subsidiaries (Patriot). Summarized Results of Discontinued Operations Results from discontinued operations were as follows during the periods April 2 through September 30, 2017 , January 1 through April 1, 2017 , and the three and nine months ended September 30, 2016 : Successor Predecessor Successor Predecessor Three Months Ended September 30, 2017 Three Months Ended September 30, 2016 April 2 through September 30, 2017 January 1 through April 1, 2017 Nine Months Ended September 30, 2016 (Dollars in millions) Loss from discontinued operations, net of income taxes $ (3.7 ) $ (38.1 ) $ (6.4 ) $ (16.2 ) $ (44.5 ) Assets and Liabilities of Discontinued Operations Assets and liabilities classified as discontinued operations included in the Company’s condensed consolidated balance sheets were as follows: Successor Predecessor September 30, 2017 December 31, 2016 (Dollars in millions) Assets: Other current assets $ 0.2 $ 0.2 Investments and other assets — 15.9 Total assets classified as discontinued operations $ 0.2 $ 16.1 Liabilities: Accounts payable and accrued expenses $ 46.2 $ 55.9 Other noncurrent liabilities 185.5 198.5 Liabilities subject to compromise — 20.9 Total liabilities classified as discontinued operations $ 231.7 $ 275.3 Patriot-Related Matters A significant portion of the liabilities in the table above relate to a former subsidiary, Patriot Coal Corporation. In 2012, Patriot filed voluntary petitions for relief under Chapter 11 of Title 11 of the U.S. Code. In 2013, the Company entered into a definitive settlement agreement (2013 Agreement) with Patriot and the United Mine Workers of America (UMWA), 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 Chapter 11 of the Bankruptcy Code in the Eastern District of Virginia and subsequently initiated a process to sell some or 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. Black Lung Occupational Disease Liabilities. Patriot has 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 remains secondarily liable for the black lung liabilities related to Patriot’s workers employed by former subsidiaries of the Company. Whether the Company will ultimately be required to fund certain of those obligations in the future as a result of Patriot’s May 2015 bankruptcy remains uncertain. The amount of the liability, which was determined on an actuarial basis, was $125.4 million at September 30, 2017 . While the Company has recorded this liability, it intends to review each claim on a case-by-case basis and contest liability as appropriate. The amount of the Company’s recorded liability reflects only Patriot workers employed by former subsidiaries of the Company that are presently retired, disabled or otherwise not actively employed. The Company cannot reliably estimate the potential liabilities for Patriot’s workers employed by former subsidiaries of the Company that are presently active in the workforce because of the potential for such workers to continue to work for another coal operator that is a going concern. The Company’s accounting for the black lung liabilities related to Patriot is based on an interpretation of applicable statutes. Management believes that there exist inconsistencies among the applicable statutes, regulations promulgated under those statutes and the Department of Labor’s interpretative guidance. The Company may seek clarification from the Department of Labor regarding these inconsistencies and the accounting for these liabilities could be reduced in the future depending on the Department of Labor’s responses to inquiries. UMWA VEBA. In connection with the 2013 Agreement, the Company was required to provide total payments of $310.0 million , payable over four years through 2017, to partially fund the newly established voluntary employee beneficiary association (VEBA) and settle all Patriot and UMWA claims involving the Patriot bankruptcy. After making scheduled payments to Patriot and the VEBA amounting to $165 million through 2015, the parties agreed to a settlement of the Company’s remaining VEBA payment obligations for $75 million . As a result of the settlement, the Company recognized a gain of $68.1 million during the nine months ended September 30, 2016, which was classified in “Operating costs and expenses” in the unaudited condensed consolidated statement of operations and is included in the Company’s Corporate and Other segment results. The Company’s obligation has been satisfied and the matter has concluded. UMWA 1974 Pension Plan (UMWA Plan) Litigation. On July 16, 2015, a lawsuit was filed by the UMWA Plan, the UMWA 1974 Pension Trust (Trust) and the Trustees of the UMWA Plan and Trust (Trustees) in the United States District Court for the District of Columbia, against PEC, Peabody Holding Company, LLC (PHC), a subsidiary of the Company, and Arch Coal, Inc. (Arch). The plaintiffs sought, pursuant to the Employee Retirement Income Security Act of 1974 (ERISA) and the Multiemployer Pension Plan Amendments Act of 1980 (MPPAA), a declaratory judgment that the defendants were obligated to arbitrate any opposition to the Trustees’ determination that the defendants have statutory withdrawal liability as a result of the 2015 Patriot bankruptcy. After a legal and arbitration process and with the approval of the Bankruptcy Court, on January 25, 2017, the UMWA Plan and the Debtors agreed to a settlement of the claim whereby the UMWA Plan will be entitled to $75 million to be paid by the Company in increments through 2021. In connection with the settlement, the Company recorded a liability representing the present value of the installments of $54.3 million and recognized an equivalent charge to “Loss from discontinued operations, net of income taxes” during 2016. The balance of the liability was $44.3 million at September 30, 2017 .

Inventories

Inventories	9 Months Ended
	Sep. 30, 2017
Inventory Disclosure [Abstract]
Inventories	Inventories Inventories as of September 30, 2017 and December 31, 2016 consisted of the following: Successor Predecessor September 30, 2017 December 31, 2016 (Dollars in millions) Materials and supplies $ 104.0 $ 104.5 Raw coal 58.0 29.6 Saleable coal 145.7 69.6 Total $ 307.7 $ 203.7 Materials and supplies inventories presented above have been shown net of reserves of $5.6 million as of December 31, 2016 . At September 30, 2017, the amount of such reserves was immaterial due to the application of fresh start reporting at the Effective Date.

Derivatives and Fair Value Meas

Derivatives and Fair Value Measurements	9 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Derivatives and Fair Value Measurements	Derivatives and Fair Value Measurements Risk Management — Non-Coal Trading Activities The Company is exposed to several risks in the normal course of business, including (1) foreign currency exchange rate risk for non-U.S. dollar expenditures and balances, (2) price risk on coal produced by, and diesel fuel utilized in, the Company’s mining operations and (3) interest rate risk that has been partially mitigated by fixed rates on long-term debt. The Company manages a portion of its price risk related to the sale of coal (excluding coal trading activities) using long-term coal supply agreements (those with terms longer than one year), rather than using derivative instruments. Derivative financial instruments have historically been used to manage the Company’s risk exposure to foreign currency exchange rate risk, primarily on Australian dollar expenditures made in its Australian mining platform. This risk has historically been managed using forward contracts and options designated as cash flow hedges, with the objective of reducing the variability of cash flows associated with forecasted foreign currency expenditures. The Company has also used derivative instruments to manage its exposure to the variability of diesel fuel prices used in production in the U.S. and Australia with swaps and/or options, which it has also designated as cash flow hedges, with the objective of reducing the variability of cash flows associated with forecasted diesel fuel purchases. These risk management activities are collectively referred to as “Corporate Hedging” and are actively monitored for compliance with the Company’s risk management policies. As of September 30, 2017 , the Company had no diesel fuel derivatives in place. Subsequent to the Effective Date, the Company entered into a series of currency options and, as of September 30, 2017 , had currency options outstanding with aggregate notional amounts of $450.0 million and $675.0 million Australian dollars to hedge currency risk associated with anticipated Australian dollar expenditures during the remainder of 2017 and the first half of 2018, respectively. The instruments are average rate options whereby the Company is entitled to receive payment on the notional amount should the average Australian dollar-to-U.S. dollar exchange rate exceed approximately $0.78 over the fourth quarter of 2017 and $0.85 over the first half of 2018. The currency options are not expected to receive cash flow hedge accounting treatment and changes in fair value will be reflected in current earnings. At September 30, 2017 , the currency options’ fair value of $8.6 million was included in “Other current assets” in the accompanying unaudited condensed consolidated balance sheet. The tables below show the classification and amounts of pre-tax gains and losses related to the Company’s Corporate Hedging derivatives: Successor Three Months Ended September 30, 2017 Financial Instrument Income Statement Classification of (Losses) Gains Total gain recognized in income Gain realized in income on derivatives Unrealized loss recognized in income on non- designated derivatives (Dollars in millions) Foreign currency option contracts Operating costs and expenses $ 5.6 $ 7.3 $ (1.7 ) Total $ 5.6 $ 7.3 $ (1.7 ) Predecessor Three Months Ended September 30, 2016 Financial Instrument Income Statement Classification of (Losses) Gains Total loss recognized in income Loss reclassified from other comprehensive income into income (Loss) gain realized in income on derivatives Unrealized gain (loss) recognized in income on non- designated derivatives (Dollars in millions) Commodity swap contracts Operating costs and expenses $ (19.4 ) $ (19.4 ) $ — $ — Foreign currency forward contracts Operating costs and expenses (28.0 ) (28.0 ) — — Total $ (47.4 ) $ (47.4 ) $ — $ — Successor April 2 through September 30, 2017 Financial Instrument Income Statement Total gain recognized in income Gain realized in income on derivatives Unrealized gain recognized in income on non- designated derivatives (Dollars in millions) Foreign currency option contracts Operating costs and expenses $ 8.5 $ 7.0 $ 1.5 Total $ 8.5 $ 7.0 $ 1.5 Predecessor January 1 through April 1, 2017 Financial Instrument Income Statement Total loss recognized in income Loss reclassified from other comprehensive loss into income (Loss) gain realized in income on derivatives Unrealized gain (loss) recognized in income on non- designated derivatives (Dollars in millions) Commodity swap contracts Operating costs and expenses $ (11.0 ) $ (11.0 ) $ — $ — Foreign currency forward contracts Operating costs and expenses (16.6 ) (16.6 ) — — Total $ (27.6 ) $ (27.6 ) $ — $ — Predecessor Nine Months Ended September 30, 2016 Financial Instrument Income Statement Total loss recognized in income Loss reclassified from other comprehensive income into income (1) (Loss) gain realized in income on derivatives Unrealized gain (loss) recognized in income on non- designated derivatives (Dollars in millions) Commodity swap contracts Operating costs and expenses $ (78.3 ) $ (66.4 ) $ (11.9 ) $ — Commodity swap contracts Reorganization items, net (38.8 ) — (38.8 ) — Foreign currency forward contracts Operating costs and expenses (119.4 ) (122.1 ) 2.7 — Foreign currency forward contracts Reorganization items, net (36.4 ) — (36.4 ) — Total $ (272.9 ) $ (188.5 ) $ (84.4 ) $ — (1) Includes the reclassification from “Accumulated other comprehensive income (loss)” into earnings of $13.6 million and $9.0 million of previously unrecognized losses on foreign currency and fuel contracts, respectively, monetized in the first quarter of 2016. Cash Flow Presentation. The Company classifies the cash effects of its Corporate Hedging 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. Financial Instruments Measured on a Recurring Basis. The following tables set forth the hierarchy of the Company’s net financial asset positions for which fair value is measured on a recurring basis: Successor September 30, 2017 Level 1 Level 2 Level 3 Total (Dollars in millions) Foreign currency contracts $ — $ 8.6 $ — $ 8.6 Total net financial assets $ — $ 8.6 $ — $ 8.6 The Company had no transfers between fair value hierarchy levels subsequent to the Effective Date. As of December 31, 2016 , the Company did not have any outstanding financial positions. 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: • Investments in debt and equity securities: U.S. government securities and marketable equity securities are valued based on quoted prices in active markets (Level 1) and investment-grade corporate bonds and U.S. government agency securities are valued based on the various inputs listed above that may preclude the security from being measured using an identical asset in an active market (Level 2). • Commodity swap contracts — diesel fuel and explosives: valued based on 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, then the Company classifies such contracts as Level 3. • Foreign currency forward and option contracts: 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. Other Financial Instruments. The Company used the following methods and assumptions in estimating fair values for other financial instruments as of September 30, 2017 and December 31, 2016 : • Cash and cash equivalents, accounts receivable, including those within the Company’s accounts receivable securitization program, 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 with an active trading market when available (Level 2), and otherwise on estimated borrowing rates to discount the cash flows to their present value (Level 3). The estimated fair value of the Company’s current and long-term debt as of December 31, 2016 is unable to be determined given it was subject to compromise in connection with the Plan. The carrying amounts and estimated fair values of the Company’s long-term debt as of September 30, 2017 are summarized as follows: Successor September 30, 2017 Carrying Estimated (Dollars in millions) Long-term debt $ 1,659.1 $ 1,744.3

Coal Trading

Coal Trading	9 Months Ended
	Sep. 30, 2017
Coal Trading [Abstract]
Coal Trading	Coal Trading The Company engages in the direct and brokered trading of coal and freight-related contracts (coal trading). 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 includes instruments associated with coal trading transactions as a part of its trading book. Trading revenues from such transactions are recorded in “Other revenues” in the unaudited condensed consolidated statements of operations and include realized and unrealized gains and losses on derivative instruments, including those that arise from coal deliveries related to contracts accounted for on an accrual basis under the normal purchases and normal sales exception. Therefore, the Company has elected the trading exemption surrounding disclosure of its coal trading activities. Trading revenues (losses) recognized during the periods presented below were as follows: Successor Predecessor Successor Predecessor Trading Revenues (Losses) by Type of Instrument Three Months Ended September 30, 2017 Three Months Ended September 30, 2016 April 2 through September 30, 2017 January 1 through April 1, 2017 Nine Months Ended September 30, 2016 (Dollars in millions) Futures, swaps and options $ (17.1 ) $ (19.6 ) $ (24.4 ) $ (10.2 ) $ (42.7 ) Physical purchase/sale contracts 36.5 22.3 49.0 25.2 59.2 Total trading revenues $ 19.4 $ 2.7 $ 24.6 $ 15.0 $ 16.5 Offsetting and Balance Sheet Presentation The Company’s coal trading assets and liabilities include financial instruments, such as swaps, futures and options, cleared through various exchanges, which involve the daily net settlement of open positions. The Company must post cash collateral in the form of initial margin, in addition to variation margin, on exchange-cleared positions that are in a net liability position and receives variation margin when in a net asset position. The Company also transacts in coal trading financial swaps and options through over-the-counter (OTC) markets with financial institutions and other non-financial trading entities under International Swaps and Derivatives Association (ISDA) Master Agreements, which contain symmetrical default provisions. Certain of the Company’s coal trading agreements with OTC counterparties also contain credit support provisions that may periodically require the Company to post, or entitle the Company to receive, variation margin. Physical coal and freight-related purchase and sale contracts included in the Company’s coal trading assets and liabilities are executed pursuant to master purchase and sale agreements that also contain symmetrical default provisions and allow for the netting and setoff of receivables and payables that arise during the same time period. The Company offsets its coal trading asset and liability derivative positions, and variation margin related to those positions, on a counterparty-by-counterparty basis in the condensed consolidated balance sheets, with the fair values of those respective derivatives reflected in “Assets from coal trading activities, net” and “Liabilities from coal trading activities, net.” The fair value of assets and liabilities from coal trading activities presented on a gross and net basis as of September 30, 2017 and December 31, 2016 is set forth below: Affected Line Item in the Condensed Consolidated Balance Sheets Gross Amounts of Recognized Assets (Liabilities) Gross Amounts Offset in the Condensed Consolidated Balance Sheets Variation Margin Posted (1) Net Amounts of Assets (Liabilities) Presented in the Condensed Consolidated Balance Sheets (Dollars in millions) Successor Fair Value as of September 30, 2017 Assets from coal trading activities, net $ 127.1 $ (124.6 ) $ — $ 2.5 Liabilities from coal trading activities, net (157.5 ) 124.6 31.9 (1.0 ) Total, net $ (30.4 ) $ — $ 31.9 $ 1.5 Predecessor Fair Value as of December 31, 2016 Assets from coal trading activities, net $ 191.2 $ (190.5 ) $ — $ 0.7 Liabilities from coal trading activities, net (249.1 ) 190.5 57.4 (1.2 ) Total, net $ (57.9 ) $ — $ 57.4 $ (0.5 ) (1) None of the net variation margin posted at September 30, 2017 and December 31, 2016, respectively, related to cash flow hedges. See Note 7. “Derivatives and Fair Value Measurements” for information on balance sheet offsetting related to the Company’s Corporate Hedging activities. Fair Value Measurements The following tables set forth the hierarchy of the Company’s net financial asset (liability) coal trading positions for which fair value is measured on a recurring basis as of September 30, 2017 and December 31, 2016 : Successor September 30, 2017 Level 1 Level 2 Level 3 Total (Dollars in millions) Futures, swaps and options $ — $ 0.5 $ — $ 0.5 Physical purchase/sale contracts — 1.0 — 1.0 Total net financial assets $ — $ 1.5 $ — $ 1.5 Predecessor December 31, 2016 Level 1 Level 2 Level 3 Total (Dollars in millions) Futures, swaps and options $ — $ (0.1 ) $ — $ (0.1 ) Physical purchase/sale contracts — 0.7 (1.1 ) (0.4 ) Total net financial assets (liabilities) $ — $ 0.6 $ (1.1 ) $ (0.5 ) For Level 1 and 2 financial assets and liabilities, the Company utilizes both direct and indirect observable price quotes, including U.S. interest rate curves; LIBOR yield curves; Chicago Mercantile Exchange (CME) Group, Intercontinental Exchange (ICE), Baltic Exchange and Singapore Exchange (SGX) contract prices; broker quotes; published indices and other market quotes. Below is a summary of the Company’s valuation techniques for Level 1 and 2 financial assets and liabilities: • Futures, swaps and options: 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. • Physical purchase/sale contracts: purchases and sales at locations with significant market activity corroborated by market-based information (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. Physical purchase/sale contracts include a credit valuation adjustment based on credit and non-performance risk (Level 3). The credit valuation adjustment has not historically had a material impact on the valuation of the contracts resulting in Level 2 classification. However, due to the Company’s corporate credit rating downgrades in 2016, the credit valuation adjustment as of December 31, 2016 is considered to be a significant unobservable input in the valuation of the contracts resulting in Level 3 classification. During the second quarter of 2017, two of the major rating agencies upgraded the Company’s corporate credit rating upon emergence from the Chapter 11 proceedings. With the credit rating upgrade, the credit valuation adjustment as of September 30, 2017 no longer has a material impact on the valuation of contracts and is in line with the Company’s historical range. The Company’s risk management function, which is independent of the Company’s commercial trading function, is responsible for valuation policies and procedures, with oversight from executive management. Generally, the Company’s Level 3 instruments or contracts are valued using bid/ask price quotations and other market assessments obtained from multiple, independent third-party brokers or other transactional data incorporated into internally-generated DCF models. Decreases in the number of third-party brokers or market liquidity could erode the quality of market information and therefore the valuation of the Company’s market positions. The Company’s valuation techniques include basis adjustments to the foregoing price inputs for quality, such as sulfur and ash content, location differentials, expressed as port and freight costs, and credit risk. The Company’s risk management function independently validates the Company’s valuation inputs, including unobservable inputs, with third-party information and settlement prices from other sources where available. A daily process is performed to analyze market price changes and changes to the portfolio. Further periodic validation occurs at the time contracts are settled with the counterparty. These valuation techniques have been consistently applied in all periods presented, and the Company believes it has obtained the most accurate information available for the types of derivative contracts held. 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. The following table summarizes the changes in the Company’s recurring Level 3 net financial liabilities: Predecessor Successor Predecessor Three Months Ended September 30, 2016 April 2 through September 30, 2017 January 1 through April 1, 2017 Nine Months Ended September 30, 2016 (Dollars in millions) Beginning of period $ (1.1 ) $ (0.7 ) $ (1.1 ) $ (15.6 ) Transfers into Level 3 4.6 — — 5.0 Transfers out of Level 3 (11.1 ) 0.7 0.2 (0.4 ) Total gains realized/unrealized: Included in earnings 2.6 — 0.2 1.2 Sales 0.1 — — — Settlements 4.2 — — 9.1 End of period $ (0.7 ) $ — $ (0.7 ) $ (0.7 ) The Company had no transfers between Levels 1 and 2 during any of the periods presented. Transfers of liabilities into/out of Level 3 from/to Level 2 during the Successor period April 2 through September 30, 2017 , and the Predecessor periods January 1 through April 1, 2017 , and the three and nine months ended September 30, 2016 were due to the relative value of unobservable inputs to the total fair value measurement of certain derivative contracts falling below, or in the case of transfers in rising above, the 10% threshold. The Company’s policy is to value all transfers between levels using the beginning of period valuation. The following table summarizes the changes in net unrealized gains (losses) relating to Level 3 net financial assets held both as of the beginning and the end of the period: Predecessor Successor Predecessor Three Months Ended September 30, 2016 April 2 through September 30, 2017 January 1 through April 1, 2017 Nine Months Ended September 30, 2016 (Dollars in millions) Changes in unrealized gains (losses) (1) $ 0.1 $ — $ 0.3 $ (0.1 ) (1) Within the unaudited condensed consolidated statements of operations and unaudited condensed consolidated statements of comprehensive income for the periods presented, unrealized gains and losses from Level 3 items are combined with unrealized gains and losses on positions classified in Level 1 or 2, as well as other positions that have been realized during the applicable periods. As of September 30, 2017 , the timing of the estimated future realization of the value of the Company’s trading portfolio was as follows: Percentage of Year of Expiration Portfolio Total 2017 15 % 2018 82 % 2019 3 % 100 % Credit and Non-performance Risk. The fair value of the Company’s coal derivative assets and liabilities reflects adjustments for credit risk. The Company’s exposure is substantially with electric utilities, energy marketers, steel producers and nonfinancial trading houses. The Company’s policy is to independently evaluate each customer’s creditworthiness prior to entering into transactions and to regularly monitor the credit extended. If the Company engages in a transaction with a counterparty that does not meet its credit standards, the Company seeks to protect its position by requiring the counterparty to provide an appropriate credit enhancement. Also, when appropriate (as determined by its credit management function), the Company has taken steps to reduce its exposure to customers or counterparties whose credit has deteriorated and who may pose a higher risk of failure to perform under their contractual obligations. These steps include obtaining letters of credit or cash collateral (margin), requiring prepayments for shipments or the creation of customer trust accounts held for the Company’s benefit to serve as collateral in the event of a failure to pay or perform. To reduce its credit exposure related to trading and brokerage activities, the Company seeks to enter into netting agreements with counterparties that permit the Company to offset asset and liability positions with such counterparties and, to the extent required, the Company will post or receive margin amounts associated with exchange-cleared and certain OTC positions. The Company also continually monitors counterparty and contract non-performance risk, if present, on a case-by-case basis. At September 30, 2017 , 33% of the Company’s credit exposure related to coal trading activities was with investment grade counterparties, while 67% was with counterparties that are not rated. Performance Assurances and Collateral The Company is required to post variation margin on positions that are in a net liability position and is entitled to receive and hold variation margin on positions that are in a net asset position with an exchange and certain of its OTC derivative contract counterparties. At September 30, 2017 and December 31, 2016 , the Company posted a net variation margin of $31.9 million and $57.4 million , respectively. In addition to the requirements surrounding variation margin, the Company is required by the exchanges upon which it transacts to post certain additional collateral, known as initial margin, which represents an estimate of potential future adverse price movements across the Company’s portfolio under normal market conditions. The Company posted initial margin of $14.6 million as of September 30, 2017 , compared to $16.2 million as of December 31, 2016 , which is reflected in “Other current assets” in the condensed consolidated balance sheets. Certain of the Company’s derivative trading instruments require the parties to provide additional performance assurances whenever a material adverse event jeopardizes one party’s ability to perform under the instrument. If the Company was to sustain a material adverse event (using commercially reasonable standards), its counterparties could request collateralization on derivative trading instruments in net liability positions which, based on an aggregate fair value at September 30, 2017 and December 31, 2016 , would have amounted to collateral postings to counterparties of approximately $0.4 million and $2.0 million , respectively. As of September 30, 2017 , the Company was required to post no collateral to counterparties for such positions. Approximately $1.0 million collateral was required to be posted to counterparties as of December 31, 2016 . Certain of the Company’s other derivative trading instruments require the parties to provide additional performance assurances whenever a credit downgrade occurs below a certain level, as specified in each underlying contract. The terms of such derivative trading instruments typically require additional collateralization, which is commensurate with the severity of the credit downgrade. During the second quarter of 2017, two of the major rating agencies upgraded the Company’s corporate credit rating upon emergence from the Chapter 11 proceedings. The Company’s collateral requirement owed to its counterparties for these ratings based derivative trading instruments for September 30, 2017 remained at zero, consistent with December 31, 2016 . As of September 30, 2017 and December 31, 2016 , no collateral was posted to counterparties to support such derivative trading instruments.

Intangible Contract Assets and

Intangible Contract Assets and Liabilities	9 Months Ended
	Sep. 30, 2017
Revenue Recognition [Abstract]
Intangible Contract Assets and Liabilities	Intangible Contract Assets and Liabilities As described in Note 3. “Emergence from the Chapter 11 Cases and Fresh Start Reporting,” at the Effective Date, the Company recorded intangible assets of $314.9 million and liabilities of $58.7 million to reflect the inherent fair value of certain U.S. coal supply agreements as a result of favorable and unfavorable differences between contract terms and estimated market terms for the same coal products, and also recorded intangible liabilities of $116.2 million related to unutilized capacity under its port and rail take-or-pay contracts. The balances and respective balance sheet classifications of such assets and liabilities at September 30, 2017, net of accumulated amortization, are set forth in the following table: Successor September 30, 2017 (Dollars in millions) Assets Liabilities Net Total Coal supply agreements $ 231.6 $ (46.9 ) $ 184.7 Take-or-pay contracts — (108.4 ) (108.4 ) Total $ 231.6 $ (155.3 ) $ 76.3 Balance sheet classification: Investments and other assets $ 231.6 $ — $ 231.6 Accounts payable and accrued expenses — (35.7 ) (35.7 ) Other noncurrent liabilities — (119.6 ) (119.6 ) Total $ 231.6 $ (155.3 ) $ 76.3 Amortization of the intangible assets and liabilities related to coal supply agreements occurs ratably based upon coal volumes shipped per contract and is recorded as a component of “Depreciation, depletion and amortization” in the accompanying condensed consolidated statements of operations. Such amortization amounted to $41.5 million and $71.2 million during the Successor three months ended September 30, 2017 and the Successor period April 2, 2017 through September 30, 2017, respectively. The Company anticipates net amortization of sales contracts, based upon expected shipments in the next five years, to be an expense of approximately $40 million during the three months ended December 31, 2017, and for the years 2018 through 2021, expense of approximately $80 million , $40 million , $10 million , and $10 million , respectively. Future unutilized capacity and the amortization periods related to the take-or-pay contract intangible liabilities are based upon estimates of forecasted usage. Such amortization, which is classified as a reduction to “Operating costs and expenses” in the accompanying condensed consolidated statements of operations, amounted to $6.5 million and $16.4 million during the Successor three months ended September 30, 2017 and the Successor period April 2, 2017 through September 30, 2017, respectively. The Company anticipates net amortization of take-or-pay contract intangible liabilities to be approximately $6 million during the three months ended December 31, 2017, and for the years 2018 through 2021, approximately $30 million , $20 million , $10 million , and $5 million , respectively.

Equity Method Investments and F

Equity Method Investments and Financing Receivables	9 Months Ended
	Sep. 30, 2017
Financing Receivables [Abstract]
Equity Method Investments and Financing Receivables	Equity Method Investments and Financing Receivables The Company had total equity method investments and financing receivables of $75.0 million and $84.8 million reflected in “Investments and other assets” in the condensed consolidated balance sheets as of September 30, 2017 and December 31, 2016 , respectively, related to Middlemount Coal Pty Ltd (Middlemount). As noted in Note 3. “Emergence from the Chapter 11 Cases and Fresh Start Reporting,” the carrying value of the equity method investments and financing receivables was adjusted to fair value in connection with fresh start reporting based on the net present value of future cash flows associated with the Company’s 50% equity interest in Middlemount. The Company periodically makes loans to Middlemount pursuant to the related shareholders’ agreement for purposes of funding capital expenditures and working capital requirements. The Priority Loans (the amount loaned by the Company in excess of the amount loaned by the other shareholder) bear interest at a rate equal to the monthly average 30-day Australian Bank Bill Swap Reference Rate plus 3.5% . They were due to expire on June 30, 2017, but have been extended to December 31, 2018 in conjunction with a commercial agreement with the stockholders concerning the distribution of available cash against outstanding payables and the loans. The agreement requires the distribution of available cash at least twice each month. Available cash is defined as the amount in Middlemount’s bank accounts that will not be required to pay known bills within the next 35 days. The available cash is distributed to stockholders in a 50 /50 ratio, unless there is no marketing royalty payment overdue. In that situation, 100% of the available cash is distributed to the Company until its Priority Loans are repaid in full. Based on the existence of letters of support from related entities of the stockholders, the expected timing of repayment of these loans is projected to extend beyond the stated expiration date, and so the Company considers these loans to be of a long-term nature and in-substance equity. As a result, (i) the foreign currency impact related to the shareholder loans is included in foreign currency translation adjustment in the condensed consolidated balance sheets and the unaudited condensed consolidated statements of comprehensive income and (ii) interest income on the Priority Loans is recognized when cash is received. The Company received loan repayments and other cash payments from Middlemount of approximately $35.2 million during the Successor period April 2 through September 30, 2017 and approximately $31.1 million and $13.2 million during the Predecessor period January 1 through April 1, 2017 and the nine months ended September 30, 2016 , respectively. One of the Company’s Australian subsidiaries and the other shareholder of Middlemount are parties to an agreement, as amended from time to time, to provide a revolving loan (Revolving Loans) to Middlemount not to exceed $50.0 million Australian dollars (Revolving Loan Limit). The Company’s participation in the Revolving Loans will not, at any time, exceed its 50% equity interest of the Revolving Loan Limit. The Revolving Loans bear interest at 15% per annum and expire on December 31, 2018. As of September 30, 2017 and December 31, 2016, the carrying value of the Revolving Loans due to the Company’s Australian subsidiary was zero .

Property, Plant, Equipment and

Property, Plant, Equipment and Mine Development	9 Months Ended
	Sep. 30, 2017
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, 2017 and December 31, 2016 is set forth in the table below. Refer to Note 3. “Emergence from the Chapter 11 Cases and Fresh Start Reporting” for details regarding the impact of fresh start reporting on property, plant, equipment and mine development. Successor Predecessor September 30, 2017 December 31, 2016 (Dollars in millions) Land and coal interests $ 3,819.7 $ 10,330.8 Buildings and improvements 457.3 1,507.6 Machinery and equipment 1,077.4 2,130.2 Less: Accumulated depreciation, depletion and amortization (271.8 ) (5,191.9 ) Total, net $ 5,082.6 $ 8,776.7

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company’s income tax benefit of $84.1 million and $10.8 million for the three months ended September 30, 2017 and 2016 , respectively, included tax provisions of $0.9 million and $5.0 million related to the remeasurement of foreign income tax accounts. The Company’s income tax benefit of $79.4 million and $108.2 million for the Successor period of April 2 through September 30, 2017 and the nine months ended September 30, 2016 , respectively, included tax provisions of $1.0 million and $7.4 million , respectively, related to the remeasurement of foreign income tax accounts. The Company recorded an income tax benefit of $266.0 million on April 1, 2017 that was primarily comprised of benefits related to Predecessor deferred tax liabilities and accumulated comprehensive income. The Company’s income tax benefit of $263.8 million for the period of January 1 through April 1, 2017 included a tax provision of $9.4 million related to the remeasurement of foreign income tax accounts and was calculated using a discrete period method. The Company’s effective tax rate for the three month period ended September 30, 2017 and the period of April 2 through September 30, 2017 is comprised of the expected statutory tax expense offset by foreign rate differential and changes in valuation allowance, plus tax benefits for expected refunds for U.S. net operating loss carrybacks. As described in Note 3. “Emergence from the Chapter 11 Cases and Fresh Start Reporting,” the Plan provided that the Company’s pre-petition equity and certain obligations were canceled and extinguished and a significant portion of its long-term debt was discharged in exchange for new Common Stock and other consideration. Generally, absent an exception, for U.S. tax purposes a debtor recognizes cancellation of debt income (CODI) upon discharge of its outstanding indebtedness for an amount of consideration less than the adjusted issue price of such indebtedness. The Company excluded CODI with respect to the Plan from its taxable income in accordance with U.S. Internal Revenue Code (IRC) Section 108, which allows a taxpayer that is a debtor in a reorganization case to exclude CODI from taxable income if the discharge is granted by a bankruptcy court or pursuant to a plan of reorganization approved by a bankruptcy court. However, in such event, Section 108 requires a reduction in certain income tax attributes otherwise available to the taxpayer, in most cases by the amount of such CODI. Generally, the amount of CODI realized by a taxpayer is the adjusted issue price of any indebtedness discharged less the sum of (i) the amount of cash paid, (ii) the issue price of any new indebtedness issued, and (iii) the fair market value of any consideration, including equity, issued to the creditors. The actual reduction in tax attributes does not occur until the first day of the Company’s taxable year subsequent to the date of emergence, or January 1, 2018. The Company estimates that it will be able to retain approximately $3.3 billion of gross U.S. federal net operating losses (NOLs) after giving effect to such required deductions. In connection with the Company’s emergence from bankruptcy, the Company experienced an “ownership change” as defined in U.S. IRC Section 382. As a result, the Company’s ability to use pre-ownership change NOLs, general business credits, U.S. alternative minimum tax credits, foreign tax credits (FTCs) and other tax attributes to offset future taxable income or taxes owed is limited. Under U.S. IRC Section 382 and Section 383, an entity that experiences an ownership change in bankruptcy generally is subject to an annual limitation (the Annual Limitation) on its use of its pre-ownership change NOLs and other tax attributes after the ownership change equal to the equity value of the entity immediately after implementation of the plan of reorganization (reflecting the increase, if any, in value resulting from the surrender or cancellation of any claims against the Company thereunder), multiplied by the long-term tax exempt rate posted by the Internal Revenue Service, subject to certain adjustments. A significant portion of the Company’s retained NOLs (stated above) are not subject to the Annual Limitation because they are deemed attributable to the period after the ownership change. The Company also had a net unrealized built-in gain at the time of the ownership change; therefore, certain built-in gains recognized within five years after the ownership change will increase the Annual Limitation for the five-year recognition period beginning April 3, 2017 through April 2, 2022. There is significant uncertainty surrounding which assets with built-in gains will be realized within this period which otherwise would allow the Company to realize the incremental NOLs and other attributes in excess of the Annual Limitation. The estimated Annual Limitation will not prevent the usage of NOLs, provided there is sufficient income in the carryforward period. The Company maintains a full valuation allowance against its U.S. net deferred tax assets. The Company has reduced the deferred tax assets and corresponding valuation allowance related to general business credits and FTCs as a result of the Annual Limitation.

Long-term Debt

Long-term Debt	9 Months Ended
	Sep. 30, 2017
Debt Disclosure [Abstract]
Long-term Debt	Long-term Debt The Company’s total indebtedness as of September 30, 2017 and December 31, 2016 is set forth in the table below. As of December 31, 2016, substantially all of the Company’s long-term debt, with the exception of capital lease obligations, was recorded in “Liabilities subject to compromise” in the consolidated balance sheets. Refer to Note 3. “Emergence from the Chapter 11 Cases and Fresh Start Reporting” for additional information. Successor Predecessor September 30, 2017 December 31, 2016 (Dollars in millions) 6.00% Senior Secured Notes due March 2022 $ 500.0 $ — 6.375% Senior Secured Notes due March 2025 500.0 — Senior Secured Term Loan due 2022 645.0 — 2013 Revolver — 1,558.1 2013 Term Loan Facility due September 2020 — 1,162.3 6.00% Senior Notes due November 2018 — 1,518.8 6.50% Senior Notes due September 2020 — 650.0 6.25% Senior Notes due November 2021 — 1,339.6 10.00% Senior Secured Second Lien Notes due March 2022 — 979.4 7.875% Senior Notes due November 2026 — 247.8 Convertible Junior Subordinated Debentures due December 2066 — 386.1 Capital lease and other obligations 84.0 20.1 Less: Debt issuance costs (69.9 ) (70.8 ) 1,659.1 7,791.4 Less: Current portion of long-term debt 47.1 20.2 Less: Liabilities subject to compromise — 7,771.2 Long-term debt $ 1,612.0 $ — As more fully described in Note 3. “Emergence from the Chapter 11 Cases and Fresh Start Reporting”, on the Effective Date, all of the debt instruments associated with the Predecessor indebtedness included in the above table, with the exception of “Capital lease and other obligations”, were canceled and the debt obligations discharged. In accordance with the Plan, the Company was concurrently recapitalized with new debt and equity instruments, including the 6.000% Senior Notes due March 2022, the 6.375% Senior Notes due March 2025, and the Senior Secured Term Loan due 2022, included with the Successor obligations in the above table. In connection with the Chapter 11 Cases, the Company was required to pay monthly adequate protection payments to certain first lien creditors in accordance with the rates defined in its existing prepetition credit facility which included the 2013 Revolver and the 2013 Term Loan Facility due September 2020. The adequate protection payments were recorded as “Interest expense” in the consolidated statement of operations, which totaled $29.8 million during the Predecessor period January 1, 2017 through April 1, 2017. For the remaining non-first lien Predecessor indebtedness included in the table above, with the exception of capital lease and other obligations, the Company did not record interest expense subsequent to the filing of the Bankruptcy Petitions. The amount of contractual interest for such obligations which was automatically stayed in accordance with Section 502(b)(2) of the Bankruptcy Code was $92.9 million for the period January 1, 2017 through the Effective Date. 6.00% and 6.375% Senior Secured Notes (collectively, the Successor Notes) The Successor Notes were issued at par value. The Company paid aggregate debt issuance costs of $49.5 million related to the offering, which will be amortized over the respective terms of the Successor Notes. Interest payments on the Successor Notes are scheduled to occur each year on March 31st and September 30th until maturity. During the Successor three months ended September 30, 2017 and the Successor period April 2, 2017 through September 30, 2017, the Company recorded interest expense of $15.5 million and $30.6 million related to the Successor Notes, respectively. The Company may redeem the 6.00% Senior Secured Notes due March 2022, in whole or in part, beginning in 2019 at 103.0% of par, in 2020 at 101.5% of par, and in 2021 and thereafter at par. The 6.375% Senior Secured Notes due March 2025 may be redeemed, in whole or in part, beginning in 2020 at 104.8% of par, in 2021 at 103.2% of par, in 2022 at 101.6% of par, and in 2023 and thereafter at par. The indenture underlying the Successor Notes (Indenture) contains customary conditions of default and imposes certain restrictions on the Company’s activities, including its ability to incur liens, incur debt, make investments, engage in fundamental changes such as mergers and dissolutions, dispose of assets, enter into transactions with affiliates, and make certain restricted payments, such as cash dividends and share repurchases. The Successor Notes rank senior in right of payment to any subordinated indebtedness and equally in right of payment with any senior indebtedness to the extent of the collateral securing that indebtedness. The Successor Notes are jointly and severally and fully and unconditionally guaranteed on a senior secured basis by substantially all of the Company’s material domestic subsidiaries and secured by first priority liens over (1) substantially all of the assets of the Company and the guarantors, except for certain excluded assets, (2) 100% of the capital stock of each domestic restricted subsidiary of the Company, (3) 100% of the non-voting capital stock of each first tier foreign subsidiary of the Company or a foreign subsidiary holding company and no more than 65% of the voting capital stock of each first tier foreign subsidiary of the Company or a foreign subsidiary holding company, (4) a legal charge of 65% of the voting capital stock and 100% of the non-voting capital stock of Peabody Investments (Gibraltar) Limited and (5) all intercompany debt owed to the Company or any guarantor, in each case, subject to certain exceptions. The obligations under the Successor Notes are secured on a pari passu basis by the same collateral securing the Successor Credit Agreement, subject to certain exceptions. Successor Credit Agreement Following the amendment described below, the Successor Credit Agreement provides for a $650.0 million first lien senior secured term loan (the Senior Secured Term Loan), which bears interest at LIBOR plus 3.50% per annum with a 1.00% LIBOR floor. During the Successor three months ended September 30, 2017 and the Successor period April 2, 2017 through September 30, 2017, the Company recorded interest expense of $13.8 million and $26.9 million related to the Senior Secured Term Loan, respectively. Proceeds from the Senior Secured Term Loan were received net of an original issue discount and deferred financing costs of $37.3 million that will be amortized over its five -year term. The loan principal is payable in quarterly installments of $1.6 million plus accrued interest through December 2021 with the remaining balance due in March 2022. The loan principal is voluntarily prepayable at 101% of the principal amount repaid if voluntarily prepaid prior to March 18, 2018 (subject to certain exceptions, including prepayments made with internally generated cash) and is voluntarily prepayable at any time thereafter without premium or penalty. The Senior Secured Term Loan may require mandatory principal prepayments of 75% of Excess Cash Flow (as defined in the Successor Credit Agreement) for any fiscal year (commencing with the fiscal year ended December 31, 2018). The mandatory principal prepayment requirement changes to (i) 50% of Excess Cash Flow if the Company’s Total Leverage Ratio (as defined in the Successor Credit Agreement and calculated as of December 31) is less than or equal to 2.00 :1.00 and greater than 1.50 :1.00, (ii) 25% of Excess Cash Flow if the Company’s Total Leverage Ratio is less than or equal to 1.50 :1.00 and greater than 1.00 :1.00, or (iii) zero if the Company’s Total Leverage Ratio is less than or equal to 1.00 :1.00. If required, mandatory prepayments resulting from Excess Cash Flows are payable within 100 days after the end of each fiscal year. In certain circumstances, the Senior Secured Term Loan also requires that Excess Proceeds (as defined in the Successor Credit Agreement) of $10.0 million or greater from sales of Company assets be applied against the loan principal, unless such proceeds are reinvested within one year. Under the Successor Credit Agreement, the Company’s annual capital expenditures are limited to $220.0 million , $220.0 million , $250.0 million , $250.0 million , and $300.0 million from 2017 through 2021, respectively, subject to certain adjustments. The agreement contains customary conditions of default and imposes certain restrictions on the Company’s activities, including its ability to incur liens, incur debt, make investments, engage in fundamental changes such as mergers and dissolutions, dispose of assets, enter into transactions with affiliates, and make certain restricted payments, such as cash dividends and share repurchases. Obligations under the Successor Credit Agreement are secured on a pari passu basis by the same collateral securing the Successor Notes. The Company voluntarily prepaid $300.0 million of the original $950.0 loan principal amount on the Senior Secured Term Loan in $150.0 million installments on July 31, 2017 and September 11, 2017. On September 18, 2017, the Company entered into an amendment to the Successor Credit Agreement (the Amendment) which lowered the interest rate from LIBOR plus 4.50% per annum with a 1.00% LIBOR floor to LIBOR plus 3.50% with a 1.00% LIBOR floor. The Amendment permits the Company to add an incremental revolving credit facility in addition to the Company’s ability to add one or more incremental term loan facilities under the Successor Credit Agreement. The incremental revolving credit facility and/or incremental term loan facilities, which remain unutilized, can be in an aggregate principal amount of up to $300.0 million plus additional amounts so long as the Company is below Total Leverage Ratio requirements as set forth in the Successor Credit Agreement. The Amendment also made available an additional restricted payment basket that permits additional repurchases, dividends or other distributions with respect to the Company’s Common and Preferred Stock in an aggregate amount up to $450.0 million so long as the Company’s Fixed Charge Coverage Ratio (as defined in the Successor Credit Agreement) would not exceed 2.00:1.00 on a pro forma basis. The voluntary prepayments of $300.0 million made prior to the Amendment were accounted for as a partial debt extinguishment and accordingly, a pro rata portion of debt issuance costs and original issue discount of $11.0 million was charged to loss on early debt extinguishment in the accompanying condensed consolidated statements of operations during the Successor three months ended September 30, 2017. The Amendment was accounted for partially as a debt modification and partially as an extinguishment, the latter of which relating to certain lenders no longer participating in the Senior Secured Term Loan syndicate subsequent to the Amendment. As a result, the Company charged an additional pro rata portion of debt issuance costs and original issue discount of $1.9 million to “Loss on early debt extinguishment” in the accompanying condensed consolidated statements of operations during the Successor three months ended September 30, 2017 and the Successor period of April 2 through September 30, 2017. The Company also recorded $6.1 million of deferred financing costs paid to the remaining lenders and expensed $2.0 million of other fees associated with the Amendment to “Interest expense” in the accompanying condensed consolidated statements of operations during the Successor three months ended September 30, 2017 and the Successor period of April 2 through September 30, 2017. Restricted Payments Under the Successor Notes and Successor Credit Agreement In addition to the $450.0 million restricted payment basket provided for under the Amendment, the Indenture and the Successor Credit Agreement allow for $50.0 million of otherwise restricted payments. Additive to this general limit are certain “builder basket” provisions that may increase the amount of allowable restricted payments, as calculated periodically based upon the Company’s operating performance. Beginning on January 1, 2018, the payment of dividends and purchases of the Company’s Common Stock are permitted under additional provisions in the Indenture and the Successor Credit Agreement in an aggregate amount in any calendar year not to exceed $25.0 million , so long as the Company’s Total Leverage Ratio would not exceed 1.25 :1.00 on a pro forma basis. During the three months ended September 30, 2017, the Company made repurchases of its Common Stock, as described in Note 16. “Other Events”. Capital Lease Obligations The Company leases equipment and facilities under various noncancelable lease agreements and historically, the majority of the Company's leases have been accounted for as operating leases. Certain lease agreements were subject to the restrictive covenants of the 2013 Credit Facility which was canceled upon emergence from the Chapter 11 Cases and included cross-acceleration provisions, under which the lessor could require certain remedies including, but not limited to, immediate recovery of the present value of any remaining lease payments. During the Chapter 11 Cases, the Debtors amended and assumed certain leases and made lump sum payments to terminate certain other leases. In relation to the Company's non-Debtor subsidiaries, the Company successfully negotiated standstill agreements during the Chapter 11 Cases and successfully amended the leases, with those amendments becoming effective upon emergence from the Chapter 11 Cases. Certain of these amendments resulted in new lease agreements which are being accounted for as capital leases with an initial aggregate obligation of approximately $79.9 million .

Pension and Postretirement Bene

Pension and Postretirement Benefit Costs	9 Months Ended
	Sep. 30, 2017
Retirement Benefits [Abstract]
Pension and Postretirement Benefit Costs	Pension and Postretirement Benefit Costs Net periodic pension (income) cost included the following components: Successor Predecessor Successor Predecessor Three Months Ended September 30, 2017 Three Months Ended September 30, 2016 April 2 through September 30, 2017 January 1 through April 1, 2017 Nine Months Ended September 30, 2016 (Dollars in millions) Service cost for benefits earned $ 0.5 $ 0.7 $ 1.1 $ 0.6 $ 2.0 Interest cost on projected benefit obligation 9.4 10.3 18.7 9.7 31.0 Expected return on plan assets (11.2 ) (11.3 ) (22.4 ) (11.0 ) (33.9 ) Amortization of prior service cost and net actuarial loss — 6.3 — 6.4 18.8 Net periodic pension (income) cost $ (1.3 ) $ 6.0 $ (2.6 ) $ 5.7 $ 17.9 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, 2017 , the Company’s qualified plans were expected to be at or above the Pension Protection Act thresholds. Prior to emergence from the Chapter 11 Cases, the Company incurred pension costs for two non-qualified pension plans which it no longer sponsors. Minimum funding standards are legislated by ERISA and are modified by pension funding stabilization provisions included in the Moving Ahead for Progress in the 21st Century Act of 2012, the Highway and Transportation Funding Act of 2014 and the Bipartisan Budget Act of 2015. During the Successor period April 2 through September 30, 2017 , the Company contributed $30.1 million to its qualified pension plans including a discretionary contribution of $25.0 million . Net periodic postretirement benefit cost included the following components: Successor Predecessor Successor Predecessor Three Months Ended September 30, 2017 Three Months Ended September 30, 2016 April 2 through September 30, 2017 January 1 through April 1, 2017 Nine Months Ended September 30, 2016 (Dollars in millions) Service cost for benefits earned $ 2.3 $ 2.6 $ 4.6 $ 2.3 $ 7.8 Interest cost on accumulated postretirement benefit obligation 8.2 8.8 16.5 8.4 26.4 Amortization of prior service cost and net actuarial loss — 2.4 — 3.2 7.1 Net periodic postretirement benefit cost $ 10.5 $ 13.8 $ 21.1 $ 13.9 $ 41.3

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) The following table sets forth the after-tax components of accumulated other comprehensive income (loss) and changes thereto recorded during the Predecessor period January 1 through April 1, 2017 and the Successor period April 2 through September 30, 2017 : Foreign Currency Translation Adjustment Net Actuarial Loss Associated with Postretirement Plans and Workers’ Compensation Obligations Prior Service Cost Associated with Postretirement Plans Cash Flow Hedges Total Accumulated Other Comprehensive Income (Loss) (Dollars in millions) Predecessor Company December 31, 2016 $ (148.2 ) $ (256.3 ) $ 21.7 $ (94.2 ) $ (477.0 ) Reclassification from other comprehensive income to earnings — 5.8 (1.4 ) 18.6 23.0 Current period change 5.5 — — — 5.5 Fresh start reporting adjustment 142.7 250.5 (20.3 ) 75.6 448.5 April 1, 2017 $ — $ — $ — $ — $ — Successor Company Current period change 1.8 — — — 1.8 September 30, 2017 $ 1.8 $ — $ — $ — $ 1.8 The components of accumulated other comprehensive income (loss) related to postretirement plans and workers’ compensation obligations and cash flow hedges related to Predecessor periods were eliminated in accordance with fresh start reporting as described in Note 3. “Emergence from the Chapter 11 Cases and Fresh Start Reporting.” The following table provides additional information regarding items reclassified out of “Accumulated other comprehensive income (loss)” into earnings during the Predecessor periods January 1 through April 1, 2017 and the three and nine months ended September 30, 2016 : Amount reclassified from accumulated other comprehensive income (loss) (1) Predecessor Details about accumulated other comprehensive income (loss) components Three Months Ended September 30, 2016 January 1 through April 1, 2017 Nine Months Ended September 30, 2016 Affected line item in the unaudited condensed consolidated statement of operations (Dollars in millions) Net actuarial loss associated with postretirement plans and workers’ compensation obligations: Postretirement health care and life insurance benefits $ (5.2 ) $ (5.5 ) $ (15.4 ) Operating costs and expenses Defined benefit pension plans (5.1 ) (5.3 ) (15.3 ) Operating costs and expenses Defined benefit pension plans (1.1 ) (1.0 ) (3.2 ) Selling and administrative expenses Insignificant items 3.0 2.7 8.8 (8.4 ) (9.1 ) (25.1 ) Total before income taxes 3.1 3.3 9.3 Income tax benefit $ (5.3 ) $ (5.8 ) $ (15.8 ) Total after income taxes Prior service credit associated with postretirement plans: Postretirement health care and life insurance benefits $ 2.8 $ 2.3 $ 8.3 Operating costs and expenses Defined benefit pension plans (0.1 ) (0.1 ) (0.3 ) Operating costs and expenses 2.7 2.2 8.0 Total before income taxes (1.0 ) (0.8 ) (3.0 ) Income tax provision $ 1.7 $ 1.4 $ 5.0 Total after income taxes Cash flow hedges: Foreign currency cash flow hedge contracts $ (28.0 ) $ (16.6 ) $ (122.1 ) Operating costs and expenses Fuel and explosives commodity swaps (19.4 ) (11.0 ) (66.4 ) Operating costs and expenses Insignificant items (0.1 ) (0.1 ) (0.4 ) (47.5 ) (27.7 ) (188.9 ) Total before income taxes 17.6 9.1 69.9 Income tax benefit $ (29.9 ) $ (18.6 ) $ (119.0 ) Total after income taxes (1) Presented as gains (losses) in the unaudited condensed consolidated statements of operations.

Other Events

Other Events	9 Months Ended
	Sep. 30, 2017
Other Events [Abstract]
Other Events	Other Events Divestitures On September 5, 2017, the Company entered into an agreement to sell the majority of its Burton Mine and related infrastructure to the Lenton Joint Venture for approximately $11.0 million . The transaction is conditional on a number of regulatory and other requirements and completion is expected to take place by March 31, 2018. The Lenton Joint Venture will assume the reclamation obligations associated with the assets being acquired by the Lenton Joint Venture. If completed, the transaction is expected to reduce the Company’s asset retirement obligation by approximately $53.0 million and reduce the amount of restricted cash held in support of such obligations by approximately $30.0 million . The Burton Mine, located in Queensland's Bowen Basin, entered a care, maintenance and rehabilitation phase in December 2016. At September 30, 2017, the Company’s assets associated with the pending transaction had no carrying value. On August 29, 2017, the Company entered into an agreement to sell its 50% interest in the Red Mountain Joint Venture (RMJV) with BHP Billiton Mitsui Coal Pty Ltd (BMC) for $20.0 million . RMJV operates the coal handling and preparation plant utilized by the Company’s Millennium Mine. The transaction is conditional on a number of regulatory and other requirements and completion is expected to take place in the fourth quarter of 2017. BMC will assume the reclamation obligations and other commitments associated with the assets of RMJV. The agreement contains provisions allowing the Millennium Mine continued usage of the coal handling and preparation plant and the associated rail loading facility until the end of 2019. The Company had a 37.5% interest in Dominion Terminal Associates, a partnership that operates a coal export terminal in Newport News, Virginia that exports both metallurgical and thermal coal primarily to Europe and Brazil. On March 31, 2017, the Company completed a sale of its interest in Dominion Terminal Associates to Contura Terminal, LLC and Ashland Terminal, Inc., both of which are partners of the Dominion Terminal Associates. The Company collected $20.5 million in proceeds and recorded $19.7 million of gain on the sale, which was classified in “Net gain on disposal of assets” in the accompanying unaudited condensed consolidated statement of operations during the Predecessor period January 1, 2017 through April 1, 2017. In November 2016, the Company entered into a definitive share sale and purchase agreement (SPA) for the sale of all of the equity interests in Metropolitan Collieries Pty Ltd, the entity that owns Metropolitan Mine in New South Wales, Australia, and the associated interest in the Port Kembla Coal Terminal, to South32 Limited (South32). The SPA provided for a cash purchase price of $200.0 million and certain contingent consideration, subject to a customary working capital adjustment. South32 terminated the agreement in April 2017 after it was unable to obtain necessary approvals from the Australian Competition and Consumer Commission within the timeframe required under the SPA. As a result of the termination, the Company retained an earnest deposit posted by South32 which was recorded in “Other revenues” in the accompanying unaudited condensed consolidated statements of operations during the Successor period April 2, 2017 through September 30, 2017. In November 2015, the Company entered into a definitive agreement to sell its New Mexico and Colorado assets to Bowie Resource Partners, LLC (Bowie) in exchange for cash proceeds of $358.0 million and the assumption of certain liabilities. Bowie agreed to pay the Company a termination fee of $20.0 million (Termination Fee) in the event the Company terminated the agreement because Bowie failed to obtain financing and close the transaction. On April 12, 2016, Peabody terminated the agreement and demanded payment of the Termination Fee. Following a favorable judgment by the Bankruptcy Court, the Company collected the Termination Fee from Bowie. The Termination Fee is included in “Other revenues” in the accompanying unaudited condensed consolidated statements of operations during the Successor period April 2, 2017 through September 30, 2017. In May 2016, the Company completed the sale of its 5.06% participation interest in the Prairie State Energy Campus to the Wabash Valley Power Association for $57.1 million . The Company recognized a gain on sale of $6.2 million related to the transaction, which was classified in “Net gain on disposal of assets” in the unaudited condensed consolidated statement of operations for the Predecessor nine months ended September 30, 2016. In April 2016, the Company entered into sale and purchase agreements with Australia-based Pembroke Resources to sell its interest in undeveloped metallurgical reserve tenements in Queensland's Bowen Basin. The transaction included Olive Downs South, Olive Downs South Extended and Willunga tenements, which were sold for $64.1 million in cash plus a royalty stream. The Company recognized a gain on sale of $2.8 million related to those tenements, which was classified in “Net gain on disposal of assets” in the unaudited condensed consolidated statement of operations for the Predecessor nine months ended September 30, 2016. The sale and purchase agreement for the remaining tenements, namely the Olive Downs North tenements, terminated in October 2017 as certain closing conditions were not satisfied within the prescribed time period. Share Repurchase Program On August 1, 2017, the Board authorized a $500.0 million share repurchase program. Repurchases may be made from time to time at the Company’s discretion. The specific timing, price and size of purchases will depend on the share price, general market and economic conditions and other considerations, including compliance with various debt agreements as they may be amended from time to time. No expiration date has been set for the repurchase program, and the program may be suspended or discontinued at any time. On August 23, 2017, the Company repurchased approximately 1.5 million shares of its Common Stock for $40.0 million in connection with an underwritten secondary offering. During September 2017, the Company made additional open-market purchases of approximately 1.0 million shares of its Common Stock for $29.2 million . Subsequent to September 30, 2017 and through October 30, 2017, the Company purchased an additional approximately 1.3 million shares of Common Stock for $37.7 million .

Earnings per Share (EPS)

Earnings per Share (EPS)	9 Months Ended
	Sep. 30, 2017
Earnings Per Share [Abstract]
Earnings per Share (EPS)	Earnings per Share (EPS) Basic and diluted EPS are computed using the two-class method, which is an earnings allocation that determines EPS for each class of common stock and participating securities according to dividends declared and participation rights in undistributed earnings. The Company’s convertible preferred stock is considered a participating security because holders are entitled to receive dividends on an if-converted basis. The Predecessor Company’s restricted stock awards were considered participating securities because holders were entitled to receive non-forfeitable dividends during the vesting term. Diluted EPS includes securities that could potentially dilute basic EPS during a reporting period and assumes that participating securities are not executed or converted. As such, the Company includes the share-based compensation awards in its potentially dilutive securities. Diluted EPS for the Predecessor Company also included the Debentures. 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 the Predecessor Company’s performance units, which are further described in Note 20. “Share-Based Compensation” in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016, as amended on July 10, 2017 and August 14, 2017, 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 the Predecessor Company’s performance units, their contingent features resulted 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 Debentures could have resulted, up to the time of the cancellation, in payment for any conversion value in excess of the principal amount of the Debentures in the Predecessor Company’s common stock. For diluted EPS purposes, potential common stock was calculated based on whether the market price of the Predecessor Company’s common stock at the end of each reporting period was in excess of the conversion price of the Debentures. The effect of the Debentures was excluded from the calculation of diluted EPS for all periods presented herein because to do so would have been anti-dilutive for those periods. The computation of diluted EPS for the Successor Company excluded aggregate share-based compensation awards of less than 0.1 million for three months ended September 30, 2017 and the period of April 2 through September 30, 2017 , respectively. The computation of diluted EPS for the Predecessor Company excluded aggregate share-based compensation awards of approximately 0.2 million for the period January 1 through April 1, 2017 and 0.4 million for the three and nine months ended September 30, 2016 , respectively, 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. The following illustrates the earnings allocation method utilized in the calculation of basic and diluted EPS. Successor Predecessor Successor Predecessor Three Months Ended September 30, 2017 Three Months Ended September 30, 2016 April 2 through September 30, 2017 January 1 through April 1, 2017 Nine Months Ended September 30, 2016 (In millions, except per share data) EPS numerator: Income (loss) from continuing operations, net of income taxes $ 233.7 $ (97.7 ) $ 335.1 $ (195.5 ) $ (488.6 ) Less: Series A Convertible Preferred Stock dividends 23.5 — 138.6 — — Less: Net income attributable to noncontrolling interests 5.1 1.8 8.9 4.8 3.5 Income (loss) from continuing operations attributable to common stockholders, before allocation of earnings to participating securities 205.1 (99.5 ) 187.6 (200.3 ) (492.1 ) Less: Earnings allocated to participating securities 51.6 — 50.6 — — Income (loss) from continuing operations attributable to common stockholders, after allocation of earnings to participating securities (1) 153.5 (99.5 ) 137.0 (200.3 ) (492.1 ) Loss from discontinued operations, net of income taxes (3.7 ) (38.1 ) (6.4 ) (16.2 ) (44.5 ) Less: Loss from discontinued operations allocated to participating securities (0.9 ) — (1.7 ) — — Loss from discontinued operations attributable to common stockholders, after allocation of earnings to participating securities (2.8 ) (38.1 ) (4.7 ) (16.2 ) (44.5 ) Net income (loss) attributable to common stockholders, after allocation of earnings to participating securities (1) $ 150.7 $ (137.6 ) $ 132.3 $ (216.5 ) $ (536.6 ) EPS denominator: Weighted average shares outstanding — basic 101.6 18.3 99.2 18.3 18.3 Impact of dilutive securities 1.5 — 1.0 — — Weighted average shares outstanding — diluted (2) 103.1 18.3 100.2 18.3 18.3 Basic EPS attributable to common stockholders: Income (loss) from continuing operations $ 1.51 $ (5.44 ) $ 1.38 $ (10.93 ) $ (26.91 ) Loss from discontinued operations (0.03 ) (2.09 ) (0.05 ) (0.88 ) (2.43 ) Net income (loss) attributable to common stockholders $ 1.48 $ (7.53 ) $ 1.33 $ (11.81 ) $ (29.34 ) Diluted EPS attributable to common stockholders: Income (loss) from continuing operations $ 1.49 $ (5.44 ) $ 1.37 $ (10.93 ) $ (26.91 ) Loss from discontinued operations (0.02 ) (2.09 ) (0.05 ) (0.88 ) (2.43 ) Net income (loss) attributable to common stockholders $ 1.47 $ (7.53 ) $ 1.32 $ (11.81 ) $ (29.34 ) (1) The reallocation adjustment for participating securities to arrive at the numerator to calculate diluted EPS was $0.6 million for the Successor three months ended September 30, 2017 and $0.4 million for the Successor period April 2 through September 30, 2017. (2) The two-class method assumes that participating securities are not exercised or converted. As such, weighted average diluted shares outstanding excluded 34.2 million shares and 36.7 million shares related to the participating securities for the Successor three months ended September 30, 2017 and the Successor period April 2 through September 30, 2017, respectively. In accordance with the Plan, each share of the Predecessor Company’s common stock outstanding prior to the Effective Date, including all options and warrants to purchase such stock, were extinguished, canceled and discharged, and each such share, option or warrant has no further force or effect after the Effective Date. Furthermore, all of the Predecessor Company’s equity award agreements under prior incentive plans, and the equity awards granted pursuant thereto, were extinguished, canceled and discharged and have no further force or effect after the Effective Date. As of September 30, 2017 , approximately 14.2 million shares of Preferred Stock had been converted and no Warrants remained unexercised, which together resulted in the issuance of an additional 34.2 million shares of Common Stock. As discussed in Note 13. “Long-term Debt” and Note 16. “Other Events,” approximately 2.5 million shares of Common Stock had been repurchased as of September 30, 2017.

Financial Instruments and Other

Financial Instruments and Other Guarantees	9 Months Ended
	Sep. 30, 2017
Financial Instruments And Guarantees With Off Balance Sheet Risk Disclosure [Abstract]
Financial Instruments and Other Guarantees	Financial Instruments and Other Guarantees In the normal course of business, the Company is a party to guarantees and financial instruments, some of which carry off-balance-sheet risk and are not reflected in the accompanying unaudited condensed consolidated balance sheets. Such financial instruments are valued based on the amount of exposure under the instrument and the likelihood of required performance. Reclamation Bonding The Company is required to provide various forms of financial assurance in support of its mining reclamation obligations in the jurisdictions in which it operates. Such requirements are typically established by statute or under mining permits. Historically, such assurances have taken the form of third-party instruments such as surety bonds, bank guarantees, letters of credit, cash collateral held in restricted accounts, and self-bonding arrangements in the U.S. In connection with its emergence from the Chapter 11 Cases, the Company elected to utilize primarily a portfolio of surety bonds to support its U.S. obligations. At September 30, 2017 , the Company’s asset retirement obligations for its U.S. operations were $377.0 million and had total corresponding reclamation bonding requirements of $1,147.7 million , which were predominately supported by surety bonds. In limited cases, the Company has also issued of letters of credit in favor of the related surety providers. At September 30, 2017 , the Company’s asset retirement obligations for its Australia operations of $259.0 million were supported by a combination of bank guarantees and cash collateral. The financial instruments in support of the Company’s asset retirement obligations may also be backed by varying levels of restricted cash collateral from time to time, as further described below. Accounts Receivable Securitization As described in Note 3. “Emergence from the Chapter 11 Cases and Fresh Start Reporting,” the Company entered into the Receivables Purchase Agreement to extend the receivables securitization facility previously in place and expand that facility to include certain receivables from the Company’s Australian operations. The term of the receivables securitization program (Securitization Program) ends on April 3, 2020, subject to certain liquidity requirements and other customary events of default set forth in the Receivables Purchase Agreement. The Securitization Program provides for up to $250.0 million in funding accounted for as a secured borrowing, limited to the availability of eligible receivables, and may be secured by a combination of cash collateral and the trade receivables underlying the program, from time to time. Funding capacity under the Securitization Program may also be drawn upon for letters of credit in support of other obligations. On June 30, 2017, the Company entered into an amendment to the Securitization Program to include the receivables of additional Australian operations and reduce the associated fees payable. Under the terms of the Securitization Program, the Company contributes the trade receivables of its participating subsidiaries on a revolving basis to P&L Receivables, its wholly-owned, bankruptcy-remote subsidiary, which then sells the receivables to unaffiliated asset-backed commercial paper conduits and banks. P&L Receivables retains the ability to repurchase the receivables in certain circumstances. The assets and liabilities of P&L Receivables are consolidated with Peabody, and the Securitization Program is treated as a secured borrowing for accounting purposes, but the assets of P&L Receivables will be used first to satisfy the creditors of P&L Receivables, not Peabody’s creditors. The borrowings under the Securitization Program remain outstanding throughout the term of the agreement, subject to the Company maintaining sufficient eligible receivables, by continuing to contribute trade receivables to P&L Receivables, unless an event of default occurs. At September 30, 2017 , the Company had no outstanding borrowings and $179.5 million of letters of credit drawn under the Securitization Program. The letters of credit were primarily in support of portions of the Company’s obligations for reclamation, workers’ compensation and postretirement benefits. The Company had no cash collateral requirement under the Securitization Program at September 30, 2017 and $40.5 million required under its former receivables securitization facility in place prior to the Effective Date at December 31, 2016. The Company incurred fees associated with the Securitization Program of $3.9 million during the Successor period April 2, 2017 through September 30, 2017 , which have been recorded as interest expense in the accompanying unaudited statements of operations. As it relates to the former receivables securitization facility in place prior to the Effective Date, the Company incurred interest expense of $2.0 million during the Predecessor period January 1, 2017 through April 1, 2017, $2.4 million during the three months ended September 30, 2016 and $5.6 million during the nine months ended September 30, 2016 . Restricted Cash Collateral The Company has restricted cash held as collateral for financial assurances associated with a variety of long-term obligations and commitments surrounding the mining, reclamation and shipping of its production. At September 30, 2017 and December 31, 2016 , the Company had $530.3 million and $529.3 million , respectively, related to such obligations. The Company also had $7.8 million and $13.8 million of restricted cash at September 30, 2017 and December 31, 2016 , respectively, related to various short-term obligations. Other The Company is the lessee under numerous equipment and property leases. It is common in such commercial lease transactions for the Company, as the lessee, to agree to indemnify the lessor for the value of the property or equipment leased, should the property be damaged or lost during the course of the Company’s operations. The Company expects that losses with respect to leased property, if any, would be covered by insurance (subject to deductibles). The Company and certain of its subsidiaries have guaranteed other subsidiaries’ performance under various lease obligations. Aside from indemnification of the lessor for the value of the property leased, the Company’s maximum potential obligations under its leases are equal to the respective future minimum lease payments, and the Company assumes that no amounts could be recovered from third parties. The Company has provided financial guarantees under certain long-term debt agreements entered into by its subsidiaries and substantially all of the Company’s U.S. subsidiaries provide financial guarantees under long-term debt agreements entered into by the Company. The maximum amounts payable under the Company’s debt agreements are equal to the respective principal and interest payments

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Commitments Unconditional Purchase Obligations As of September 30, 2017 , purchase commitments for capital expenditures were $56.3 million , all of which is obligated within the next 12 months. There were no other material changes to the Company’s commitments from the information provided in Note 26 to the consolidated financial statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 , as amended on July 10, 2017 and August 14, 2017. 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 results of operations for the periods presented. Effect of Automatic Stay. The Debtors filed voluntary petitions for relief under the Bankruptcy Code on the Petition Date in the Bankruptcy Court. During the pendency of the Chapter 11 Cases, each of the Debtors continued to operate its business and manage its property as a debtor-in-possession pursuant to Sections 1107 and 1108 of the Bankruptcy Code. Subject to certain exceptions under the Bankruptcy Code, the filing of the Debtors’ Chapter 11 Cases, pursuant to Section 362(a) of the Bankruptcy Code, automatically enjoined, or stayed, among other things, the continuation of most judicial or administrative proceedings or the filing of other actions against or on behalf of the Debtors or their property to recover on, collect or secure a claim arising prior to the Petition Date or to exercise control over property of the Debtors’ bankruptcy estates. The automatic stay was lifted when the Plan became effective on April 3, 2017 and was replaced by the injunction provisions under the Debtors’ confirmed Plan. The Plan’s injunction provisions provide that all holders of prepetition claims or interests are enjoined, or stayed, from, among other things, (a) commencing, conducting or continuing any suit, action or other proceeding against the Debtors, their estates or the reorganized Debtors, (b) enforcing, levying, attaching, collecting or otherwise recovering an award against the Debtors, their property or the assets or property of the reorganized Debtors, (c) creating, perfecting or otherwise enforcing a lien against the Debtors, their estates or the reorganized Debtors, and (d) asserting any setoff, right of subrogation or recoupment against any obligation due a Debtor or a reorganized Debtor. The Chapter 11 Cases impacted the liabilities of the Debtors described below and in Note 5. “Discontinued Operations,” as well as certain other contingent liabilities the Debtors may have. For example, if a contingent litigation liability of the Debtors is ultimately allowed as a prepetition claim under the Bankruptcy Code, that claim will be subject to the applicable treatment set forth in the Plan and be discharged pursuant to the terms of the Plan. Litigation Relating to Continuing Operations Peabody Monto Coal Pty Ltd, Monto Coal 2 Pty Ltd and Peabody Energy Australia PCI Pty Ltd (PEA-PCI). In October 2007, a statement of claim was delivered to Peabody Monto Coal Pty Ltd, a wholly-owned subsidiary of PEA-PCI, that was then known as Macarthur Coal Limited, and Monto Coal 2 Pty Ltd, an equity accounted investee, from the minority interest holders in the Monto Coal Joint Venture, alleging that Monto Coal 2 Pty Ltd breached the Monto Coal Joint Venture Agreement and Peabody Monto Coal Pty Ltd breached the Monto Coal Management Agreement. Peabody Monto Coal Pty Ltd is the manager of the Monto Coal Joint Venture pursuant to the Management Agreement. Monto Coal 2 Pty Ltd holds a 51% interest in the Monto Coal Joint Venture. The plaintiffs are Sanrus Pty Ltd, Edge Developments Pty Ltd and H&J Enterprises (Qld) Pty Ltd. An additional statement of claim was delivered to PEA-PCI in November 2010 from the same minority interest holders in the Monto Coal Joint Venture, alleging that PEA-PCI induced Monto Coal 2 Pty Ltd and Peabody Monto Coal Pty Ltd to breach the Monto Coal Joint Venture Agreement and the Monto Coal Management Agreement, respectively. The plaintiffs later amended their claim to allege damages for lost opportunities to sell their joint venture interest. These actions, which are pending before the Supreme Court of Queensland, Australia, seek damages from the three defendants collectively of amounts ranging from $15.6 million Australian dollars to $1.8 billion Australian dollars, plus interest and costs. The defendants dispute the claims and are vigorously defending their positions. Orders have been made by the court relating to trial preparation steps, with the steps expected to be completed by the end of February 2018. A trial date is expected in the second half of 2018 (at the earliest) or in 2019. Based on the Company’s evaluation of the issues and their potential impact, the amount of any future loss currently cannot be reasonably estimated. Lori J. Lynn Class Action. On June 11, 2015, a former Peabody Investments Corp. (PIC) employee filed a putative class action lawsuit in the United States District Court, Eastern District of Missouri on behalf of three of the Company’s or its subsidiaries’ 401(k) retirement plans and certain participants and beneficiaries of the plans. The lawsuit, which was brought against Peabody Energy Corporation (PEC), PHC, PIC and a number of the Company’s and PIC’s current and former executives and employees, alleges breach of fiduciary duties and seeks monetary damages under ERISA relating to the offering of the Peabody Energy Stock Fund as an investment option in the 401(k) retirement plans. On September 8, 2015, the plaintiffs filed an amended complaint which, among other things, named a new plaintiff and named all of the then current members and two former members of the relevant boards of directors as defendants. The class period (December 2012 to present) remains unchanged. On November 9, 2015, the defendants filed a motion seeking dismissal of all claims. Plaintiffs filed a second amended complaint on March 11, 2016 that included new allegations against the Company related to the Company’s disclosure to investors of risks associated with climate change and related legislation and regulations. The second amended complaint also added the three committees responsible for administering the three 401(k) retirement plans at issue and dropped several individual defendants, including the then current directors of PEC’s board of directors. As a result of filing the Chapter 11 Cases, the plaintiffs voluntarily dismissed the three Debtor defendants (PEC, PIC and PHC) and elected to proceed against the individual defendants and the three named committees with the second amended complaint. On November 17, 2016, the parties presented arguments on the defendants’ motion to dismiss. On March 30, 2017, the United States District Court granted the motion to dismiss. On May 1, 2017, the plaintiffs filed a notice of appeal regarding the March 30th order granting the motion to dismiss. On July 7, 2017 the Bankruptcy Court entered an order on the agreed stipulation of the Debtors and plaintiffs such that the claim of the plaintiffs was estimated to have no value for purposes of any distribution under the Plan, except that plaintiffs are not precluded from pursuing recovery from applicable insurance, and that plaintiffs will limit their recovery solely to applicable insurance. On September 28 2017, plaintiffs unilaterally filed a notice of dismissal of the appeal with the Eighth Circuit Court of Appeals. On September 29, 2017, the Eighth Circuit Court of Appeals granted the motion to dismiss the appeal. The March 30, 2017 United States District Court’s order granting the motion to dismiss is now a final judgment. Berenergy Corporation. The Company has been in a legal dispute with Berenergy Corporation (Berenergy) regarding Berenergy’s access to certain of its underground oil deposits beneath the Company’s North Antelope Rochelle Mine and contiguous undisturbed areas. The Company believes that any claims related to this matter constitute prepetition claims. On October 13, 2016, the Sixth Judicial Court in the state of Wyoming (Wyoming Court) entered an order (Wyoming Court Decision) allowing the Company the right to mine through certain wells owned by Berenergy but required the Company to compensate Berenergy for damages of $0.9 million , which the Company recognized during 2016. Further, the Wyoming Court ruled that should Berenergy obtain approval from the Wyoming Oil and Gas Conservation Commission (the Commission) to recover certain secondary deposits beneath the mine’s contiguous undisturbed areas, the Company would be liable to Berenergy for the cost of certain special procedures and equipment required to access the secondary deposits remotely from outside the Company’s mine area, which has been estimated as $13.1 million by Berenergy. Berenergy so far has not applied to the Commission for approval and the Company believes it is not probable that the Commission would approve access to the secondary deposits if Berenergy applied based on the Company’s view of a lack of economic feasibility and certain restrictions on Berenergy’s legal claim to the deposits. Based upon these factors, the Company has not accrued a liability related to the secondary deposits as of September 30, 2017. On December 21, 2016, Berenergy filed a Notice of Appeal with the Wyoming Supreme Court of the Wyoming Court Decision. On January 5, 2017, Peabody filed a Notice of Cross-Appeal with the Wyoming Supreme Court of the Wyoming Court Decision. Both parties filed appellate briefs on April 17, 2017. The matter before the Wyoming Supreme Court has been fully briefed by the parties and oral arguments were held on August 16, 2017. On June 22, 2017, the Bankruptcy Court entered an order disallowing Berenergy’s proof of claim for the amounts awarded in the Wyoming Court Decision, which the Company believes discharged its obligation to pay these amounts. County of San Mateo, County of Marin, City of Imperial Beach. The Company was named as a defendant, along with numerous other companies, in three nearly identical lawsuits. The lawsuits seek to hold a wide variety of companies that produce fossil fuels liable for the alleged impacts of the greenhouse gas emissions attributable to those fuels. The lawsuits primarily assert that the companies’ products have caused a sea level rise that is damaging the plaintiffs. The complaints specifically alleged that the defendants’ activities from 1965 to 2015 caused such damage. The Company filed a motion to enforce the Confirmation Order in the Bankruptcy Court because the Confirmation Order enjoins claims that arose before the effective date of the Plan. The motion to enforce was heard on October 5, 2017 and granted on October 24, 2017. The Bankruptcy Court ordered the plaintiffs to dismiss their lawsuits against the Company. 10th Circuit U.S. Bureau of Land Management (BLM) Appeal. On September 15, 2017, the Tenth Circuit Court of Appeals reversed the District Court of Wyoming’s decision upholding BLM’s approval of four coal leases in the Powder River Basin. Two of the four leases relate to the Company’s North Antelope Rochelle Mine in Wyoming. There is no immediate impact on the Company’s leases as the Court of Appeals did not vacate the leases as part of its ruling. Rather, the Court of Appeals remanded the case back to the District Court with directions to order BLM to revise its environmental analysis. The Company’s operations will continue in the normal course during this period since the decision has no impact on mining at this time. The Company currently believes that its operations are unlikely to be materially impacted by this case, but the timing and magnitude of any impact on the Company’s future operations is not certain. Wilpinjong Extension Project (WEP). Wollar Progress Association has applied to the Land & Environment Court for a judicial review of the New South Wales Planning Assessment Commission’s (PAC) decision to approve the WEP. In the interim, the Company’s Wilpinjong Mine can continue to mine in accordance with its approvals. The Company intends to fully defend the validity of the PAC’s decision. Claims, Litigation and Settlements Relating to Indemnities or Historical Operations Environmental Claims and Litigation Arising From Historical, Non-Coal Producing Operations. Gold Fields Mining, LLC (Gold Fields) is a non-coal producing entity that was previously managed and owned by Hanson plc, the Company’s predecessor owner. In a February 1997 spin-off, Hanson plc transferred ownership of Gold Fields to PEC despite the fact that Gold Fields and many of its subsidiaries had no ongoing operations and PEC had no prior involvement in the past operations of Gold Fields and its subsidiaries. Prior to the Effective Date, Gold Fields was one of PEC’s subsidiaries. As part of separate transactions, both PEC and Gold Fields agreed to indemnify Blue Tee with respect to certain claims relating to the historical operations of a predecessor of Blue Tee, which is a former affiliate of Gold Fields. Neither PEC nor Gold Fields had any involvement with the past operations of the Blue Tee predecessor. Pursuant to the indemnity, Blue Tee tendered its environmental claims for remediation, past and future costs, and/or natural resource damages (Blue Tee Liabilities) to Gold Fields. Although Gold Fields has paid remediation costs as a result of the indemnification obligations, Blue Tee has been identified as a potentially responsible party (PRP) at various designated national priority list (NPL) sites under the Comprehensive Environmental Response, Compensation and Liability Act (CERCLA) and similar statutes. Of these sites where Blue Tee has been identified as a PRP, neither Gold Fields nor PEC is a party to any cleanup orders relating to the operations of Blue Tee’s predecessor. In addition to the NPL sites, Blue Tee has been named a PRP at multiple other sites, where Gold Fields has either paid remediation costs or settled the environmental claims on behalf of Blue Tee. As a result of filing the Chapter 11 Cases, Gold Fields stopped paying these remediation costs. Environmental assessments for remediation, past and future costs, and/or natural resource damages were also asserted by the United States Environmental Protection Agency (EPA) and natural resources trustees against Gold Fields related to historical activities of Gold Fields’ predecessor. Gold Fields has been identified as a PRP at four NPL sites and has been conducting response actions or working with the EPA to resolve past cost recovery claims at these sites pursuant to cleanup orders or other negotiations. As a result of filing the Chapter 11 Cases, Gold Fields ceased its response actions and other engagements with the EPA at these sites. Undiscounted liabilities for environmental cleanup-related costs relating to (i) the contractual indemnification obligations owed to Blue Tee and (ii) for the sites noted above for which Gold Fields has been identified as a PRP as a result of the operations of its predecessor, were collectively estimated to be $62.8 million as of December 31, 2016 in the condensed consolidated balance sheets. The majority of these estimated costs related to Blue Tee site liabilities. Prior to the August 19, 2016 bar date for filing claims in the Chapter 11 Cases, Blue Tee filed an unliquidated, general unsecured claim in the amount of $65.6 million against Gold Fields regarding the Blue Tee Liabilities, additional unliquidated claims in an unknown amount in excess of $150 million at known sites, and further contingent claims at known and unknown sites, including natural resources damages (NRDs) claims alleged, without explanation, to be in the range of $500 million . On November 17, 2016 Blue Tee amended it claim to increase the amount of the claim to $1.2 billion . Prior to the October 11, 2016 government bar date for filing claims in the Chapter 11 Cases, several governmental entities including the EPA, the Department of the Interior and several states filed unliquidated, secured and general unsecured claims against PEC and Gold Fields. These claims totaled in excess of $2.7 billion and alleged damages for past and future remediation costs as well as for alleged NRDs at several sites. As noted in the claims, many of the claims were duplicative as they overlapped with each other as well as with claims made by Blue Tee. On January 27, 2017, PEC filed objections to claims filed by the U.S. Department of Interior, the U.S. Department of Justice and the EPA (collectively the PEC Objections). The PEC Objections dispute that PEC has liability to the claimant under applicable federal environmental statutes for the Blue Tee sites listed in the claims based on the fact that PEC never owned any of the sites or disposed or arranged for the disposal of hazardous substances at any of the sites. On February 2, 2017, Gold Fields filed objections to claims filed by the State of Oklahoma, the State of Missouri, the U.S. Department of Interior, the EPA, the Kansas Department of Health and Environment, the Illinois Department of Natural Resources and the Missouri Department of Natural Resources (collectively the Gold Fields Objections). The Gold Fields Objections dispute that Gold Fields has liability to the claimant under applicable federal and state environmental statutes for the Blue Tee sites listed in the claims based on the fact that Gold Fields never owned any of the sites or disposed or arranged for the disposal of hazardous substances at any of the sites. On March 16, 2017, the Debtors agreed to settle the objections to the Plan filed by Blue Tee and several government entities in the Chapter 11 Cases. Under the settlements, the Debtors will (1) not seek to recover federal tax refunds owed to Debtors in the amount of approximately $11 million ; (2) transfer $12 million of insurance settlement proceeds from Century and Pacific Employers Insurance Company relating to environmental liabilities to the Gold Fields Liquidating Trust (as described in the Plan); and (3) pay $20 million to the Gold Fields Liquidating Trust. On March 16 and 17, 2017, the Bankruptcy Court entered orders approving these settlements. On July 13, 2017, the Debtors and government entities entered into a settlement agreement to reflect the above settlement. Notice of the settlement agreement was given in the Federal Register on July 20, 2017. On September 5, 2017, the Bankruptcy Court gave final approval of the settlement agreement after the notice and comment period expired. As of the Effective Date, all Gold Fields assets and liabilities have been transferred to the Gold Fields Liquidating Trust and Reorganized Debtors have no further obligations with respect to Gold Fields. 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 financial condition, results of operations or cash flows.

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2017
Segment Reporting [Abstract]
Segment Information	Segment Information The Company reports its results of operations through the following reportable segments: “Powder River Basin Mining,” “Midwestern U.S. Mining,” “Western U.S. Mining,” “Australian Metallurgical Mining,” “Australian Thermal Mining,” “Trading and Brokerage” and “Corporate and Other.” The Company’s chief operating decision maker (CODM) uses Adjusted EBITDA as the primary metric to measure each of the segment’s operating performance. Adjusted EBITDA is a non-U.S. GAAP measure defined as income (loss) from continuing operations before deducting net interest expense, income taxes, asset retirement obligation expenses, depreciation, depletion and amortization and reorganization items, net. Adjusted EBITDA is also adjusted for the discrete items that management excluded in analyzing each of the segment’s operating performance, as displayed in the reconciliation below. Management believes non-U.S. GAAP performance measures are used by investors to measure the Company’s operating performance and lenders to measure the Company’s ability to incur and service debt. 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: Successor Predecessor Successor Predecessor Three Months Ended September 30, 2017 Three Months Ended September 30, 2016 April 2 through September 30, 2017 January 1 through April 1, 2017 Nine Months Ended September 30, 2016 Revenues: Powder River Basin Mining $ 420.9 $ 419.6 $ 786.3 $ 394.3 $ 1,062.2 Midwestern U.S. Mining 207.7 211.0 402.6 193.2 599.6 Western U.S. Mining 155.7 162.4 281.1 149.7 387.0 Australian Metallurgical Mining 415.9 232.5 703.7 328.9 682.8 Australian Thermal Mining 265.8 197.9 505.0 224.8 561.4 Trading and Brokerage 19.4 2.7 24.6 15.0 16.5 Corporate and Other (8.2 ) (19.0 ) 32.2 20.3 (35.0 ) Total $ 1,477.2 $ 1,207.1 $ 2,735.5 $ 1,326.2 $ 3,274.5 Adjusted EBITDA: Powder River Basin Mining $ 112.7 $ 123.9 $ 197.5 $ 91.7 $ 278.3 Midwestern U.S. Mining 49.5 59.1 96.0 50.0 172.4 Western U.S. Mining 34.5 34.3 79.4 50.0 83.2 Australian Metallurgical Mining 143.1 (34.5 ) 215.0 109.6 (121.0 ) Australian Thermal Mining 97.8 48.9 203.7 75.6 137.2 Trading and Brokerage 2.7 (9.4 ) (2.4 ) 8.8 (41.3 ) Corporate and Other (1) (29.0 ) (92.1 ) (60.1 ) (44.4 ) (270.8 ) Total $ 411.3 $ 130.2 $ 729.1 $ 341.3 $ 238.0 (1) Includes a gain of $19.7 million related to the sale of Dominion Terminal Associates during the predecessor period January 1 through April 1, 2017 and a gain of $68.1 million related to the 2016 Settlement Agreement described in Note 5. “Discontinued Operations” during the predecessor nine months ended September 30, 2016. A reconciliation of consolidated income (loss) from continuing operations, net of income taxes to Adjusted EBITDA follows: Successor Predecessor Successor Predecessor Three Months Ended September 30, 2017 Three Months Ended September 30, 2016 April 2 through September 30, 2017 January 1 through April 1, 2017 Nine Months Ended September 30, 2016 (Dollars in millions) Income (loss) from continuing operations, net of income taxes $ 233.7 $ (97.7 ) $ 335.1 $ (195.5 ) $ (488.6 ) Depreciation, depletion and amortization 194.5 117.8 342.8 119.9 345.5 Asset retirement obligation expenses 11.3 12.7 22.3 14.6 37.3 Selling and administrative expenses related to debt restructuring — — — — 21.5 Asset impairment — — — 30.5 17.2 Change in deferred tax asset valuation allowance related to equity affiliates (3.4 ) (0.6 ) (7.7 ) (5.2 ) (0.6 ) Interest expense 42.4 58.5 83.8 32.9 243.7 Loss on early debt extinguishment 12.9 — 12.9 — — Interest income (2.0 ) (1.3 ) (3.5 ) (2.7 ) (4.0 ) Break fees related to terminated asset sales — — (28.0 ) — — Unrealized losses (gains) on non-coal trading derivative contracts 1.7 — (1.5 ) — — Unrealized losses (gains) on economic hedges 10.8 21.9 1.4 (16.6 ) 49.1 Coal inventory revaluation — — 67.3 — — Take-or-pay contract-based intangible recognition (6.5 ) — (16.4 ) — — Reorganization items, net — 29.7 — 627.2 125.1 Income tax benefit (84.1 ) (10.8 ) (79.4 ) (263.8 ) (108.2 ) Total Adjusted EBITDA $ 411.3 $ 130.2 $ 729.1 $ 341.3 $ 238.0

Coal Trading (Policies)

Coal Trading (Policies)	9 Months Ended
	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Fair Value Transfers	The Company’s policy is to value all transfers between levels using the beginning of period valuation.
Credit and Non-performance Risk	Credit and Non-performance Risk. The fair value of the Company’s coal derivative assets and liabilities reflects adjustments for credit risk. The Company’s exposure is substantially with electric utilities, energy marketers, steel producers and nonfinancial trading houses. The Company’s policy is to independently evaluate each customer’s creditworthiness prior to entering into transactions and to regularly monitor the credit extended. If the Company engages in a transaction with a counterparty that does not meet its credit standards, the Company seeks to protect its position by requiring the counterparty to provide an appropriate credit enhancement. Also, when appropriate (as determined by its credit management function), the Company has taken steps to reduce its exposure to customers or counterparties whose credit has deteriorated and who may pose a higher risk of failure to perform under their contractual obligations. These steps include obtaining letters of credit or cash collateral (margin), requiring prepayments for shipments or the creation of customer trust accounts held for the Company’s benefit to serve as collateral in the event of a failure to pay or perform. To reduce its credit exposure related to trading and brokerage activities, the Company seeks to enter into netting agreements with counterparties that permit the Company to offset asset and liability positions with such counterparties and, to the extent required, the Company will post or receive margin amounts associated with exchange-cleared and certain OTC positions. The Company also continually monitors counterparty and contract non-performance risk, if present, on a case-by-case basis.

Emergence from the Chapter 1131

Emergence from the Chapter 11 Cases and Fresh Start Reporting (Tables)	9 Months Ended
	Sep. 30, 2017
Reorganizations [Abstract]
Treatment of classified claims and interests [Table Text Block]	The following summarizes the various classes of claimants’ recoveries under the Plan. Undefined capitalized terms used in this section, Treatment of Classified Claims and Interests , are defined in the Plan. First Lien Lender Claims (Classes 1A - 1D) Paid in full in cash. Second Lien Notes Claims (Classes 2A - 2D) A combination of (1) $450 million of cash, first lien debt and/or new second lien notes and (2)(a) new common stock, par value $0.01 per share, of the Reorganized Peabody (Common Stock) and (b) subscription rights in the Rights Offering. Other Secured Claims (Classes 3A - 3E) At the election of the Debtors, (1) reinstatement, (2) payment in full in cash, (3) receipt of the applicable collateral or (4) such other treatment consistent with section 1129(b) of the Bankruptcy Code. Other Priority Claims (Classes 4A - 4E) Paid in full in cash. General Unsecured Claims Class 5A: Against Peabody Energy: a pro rata share of $5 million in cash plus an amount of additional cash (up to $2 million) not otherwise paid to holders of Convenience Claims. Class 5B: Against the Encumbered Guarantor Debtors: (1) Common Stock and subscription rights in the Rights Offering or (2) at the election of the claim holder, cash from a pool of $75 million in cash to be paid by the Debtors and the Reorganized Debtors into a segregated account in accordance with the terms set forth in the Plan. Class 5C: Against the Gold Fields Debtors: units in the Gold Fields Liquidating Trust. Class 5D: Against Peabody Holdings (Gibraltar) Limited: no recoveries. Class 5E: Against the Unencumbered Debtors: cash in the amount of such holder’s allowed claim, less any amounts attributable to late fees, postpetition interest or penalties. Convenience Claims Class 6A: Against Peabody Energy: up to 72.5% of such claim in cash, provided that total payments to Convenience Claims may not exceed $2 million. Class 6B: Against the Encumbered Guarantor Debtors: up to 72.5% of such claim in cash, provided that total payments to Convenience Claims may not exceed $18 million. United Mine Workers of America 1974 Pension Plan Claim (Classes 7A - 7E) $75 million in cash paid over five years. See Note 5. “Discontinued Operations,” for additional details. Unsecured Subordinated Debentures Claims (Class 8A) (1) Payment of the reasonable and documented fees and expenses of the trustee under the 2066 subordinated indenture up to $350,000; and (2) because this class voted in favor of the Plan and in connection with the settlement of certain potential intercreditor disputes as part of the global settlement embodied therein, and because the trustee under the 2066 subordinated indenture did not object to, and affirmatively supported, the Plan, holders of allowed Unsecured Subordinated Debenture Claims received from specified noteholder co-proponents their pro rata share of penny warrants exercisable for 1.0% of the fully diluted Reorganized Peabody common stock from the pool of penny warrants issued to the noteholder co-proponents under the Rights Offering and/or the terms of the Backstop Commitment Agreement (as defined below). Section 510(b) Claims (Class 10A) No recovery. Peabody Energy Equity Interests (Class 11A) No recovery, as further described under Cancellation of Prior Common Stock below.
Schedule of impacts of the implementation of the Plan and the application of fresh start reporting	The following balance sheet illustrates the impacts of the implementation of the Plan and the application of fresh start reporting, which results in the opening balance sheet of the Successor company. As of April 1, 2017 Predecessor (a) Effect of Plan (b) Fresh Start Adjustments (c) Successor (Dollars in millions) ASSETS Current assets Cash and cash equivalents $ 1,068.1 $ (14.4 ) (d) $ — $ 1,053.7 Restricted cash 80.7 (54.7 ) (d) — 26.0 Successor Notes issuance proceeds - restricted cash 1,000.0 (1,000.0 ) (d) — — Accounts receivable, net 312.1 — — 312.1 Inventories 250.8 — 70.1 (k) 320.9 Assets from coal trading activities, net 0.6 — — 0.6 Other current assets 493.9 (18.1 ) (e) (333.0 ) (l) 142.8 Total current assets 3,206.2 (1,087.2 ) (262.9 ) 1,856.1 Property, plant, equipment and mine development, net 8,653.9 — (3,461.4 ) (m) 5,192.5 Investments and other assets 976.4 3.9 (f) 238.0 (n) 1,218.3 Total assets $ 12,836.5 $ (1,083.3 ) $ (3,486.3 ) $ 8,266.9 LIABILITIES AND STOCKHOLDERS’ EQUITY Current liabilities Current portion of long-term debt $ 18.2 $ 9.5 (g) $ — $ 27.7 Liabilities from coal trading activities, net 0.7 — — 0.7 Accounts payable and accrued expenses 967.3 257.6 (h) 14.8 (o) 1,239.7 Total current liabilities 986.2 267.1 14.8 1,268.1 Long-term debt, less current portion 950.5 903.2 (g) — 1,853.7 Deferred income taxes 179.2 — (177.8 ) (p) 1.4 Asset retirement obligations 707.0 — (73.9 ) (q) 633.1 Accrued postretirement benefit costs 753.9 — (6.9 ) (r) 747.0 Other noncurrent liabilities 511.1 — 120.6 (s) 631.7 Total liabilities not subject to compromise 4,087.9 1,170.3 (123.2 ) 5,135.0 Liabilities subject to compromise 8,416.7 (8,416.7 ) (i) — — Total liabilities 12,504.6 (7,246.4 ) (123.2 ) 5,135.0 Stockholders’ equity Common Stock (Predecessor) 0.2 (0.2 ) (j) — — Common Stock (Successor) — 0.7 (b) — 0.7 Series A Preferred Stock (Successor) — 1,305.4 (b) — 1,305.4 Additional paid-in capital (Predecessor) 2,423.9 (2,423.9 ) (j) — — Additional paid-in capital (Successor) — 1,774.9 (b) — 1,774.9 Treasury stock, at cost (371.9 ) 371.9 (j) — — Accumulated deficit (1,284.1 ) 5,134.3 (j) (3,850.2 ) (t) — Accumulated other comprehensive loss (448.5 ) — 448.5 (t) — Peabody Energy Corporation stockholders’ equity 319.6 6,163.1 (3,401.7 ) 3,081.0 Noncontrolling interests 12.3 — 38.6 (u) 50.9 Total stockholders’ equity 331.9 6,163.1 (3,363.1 ) 3,131.9 Total liabilities and stockholders’ equity $ 12,836.5 $ (1,083.3 ) $ (3,486.3 ) $ 8,266.9 (a) Represents the Predecessor consolidated balance sheet at April 1, 2017. (b) Represents amounts recorded for the implementation of the Plan on the Effective Date. This includes the settlement of liabilities subject to compromise through a combination of cash payments, the issuance of new common stock and warrants and the issuance of new debt. The following is the calculation of the total pre-tax gain on the settlement of the liabilities subject to compromise. (Dollars in millions) Liabilities subject to compromise $ 8,416.7 Less amounts issued to settle claims: Successor Common Stock (at par) (0.7 ) Successor Series A Convertible Preferred Stock (1,305.4 ) Successor Additional paid-in capital (1,774.9 ) Issuance of Successor Notes (1,000.0 ) Issuance of Successor Term Loan (950.0 ) Cash payments and accruals for claims and professional fees (336.4 ) Other: Write-off of Predecessor debt issuance costs, see also (e) below (18.1 ) Total pre-tax gain on plan effects, see also (j) below $ 3,031.2 At the Effective Date, 70.9 million shares of Common Stock were issued and outstanding at a par value of $0.01 per share. Preferred Stock was recorded at fair value and is based upon the $750.0 million cash raised upon emergence from bankruptcy through the Private Placement Agreement, plus a premium to account for the fair value of the Preferred Stocks’ conversion and dividend features. Each share of Preferred Stock is convertible, at the holder’s election or upon the occurrence of certain triggering events, into shares of Common Stock at a 35% discount relative to the initial per share purchase price of $25.00 and provides for three years of guaranteed paid-in-kind dividends, payable semiannually, at a rate of 8.5% per annum. The 46.2 million shares of Common Stock issuable upon conversion of the Preferred Stock issued under the Plan and an additional 13.1 million shares of Common Stock attributable to such Preferred Stocks’ guaranteed paid-in-kind dividend feature constitute approximately 42% ownership of the Plan Equity Value (as defined in the Plan) of $3,105.0 million in the reorganized Company, and thus have a fair value of $1,305.4 million . Successor Additional paid-in capital was recorded at the Plan Equity Value less the amounts recorded for par value of the Common Stock, the fair value of the Preferred Stock, and certain fees incurred associated with the Registration Rights Agreement. (c) Represents the fresh start reporting adjustments required to record the assets and liabilities of the Company at fair value. (d) The following table reflects the sources and uses of cash and restricted cash at emergence: (Dollars in millions) Sources: Private placement and rights offering $ 1,500.0 Net proceeds from Senior Secured Term Loan 912.7 Escrowed interest from Successor Notes offering 8.0 Net impact on collateral requirements 11.6 Uses: Payments to secured lenders (3,489.2 ) Professional fees (8.3 ) Securitization facility deferred financing costs (3.9 ) Total cash outflow at emergence $ (1,069.1 ) (e) Primarily represents the write off of deferred financing costs associated with the cancellation and discharge of Predecessor revolving debt obligations. (f) Represents the payment of deferred financing costs associated with the Receivables Purchase Agreement. (g) Represents a new $950 million Senior Secured Term Loan, net of an original issue discount and deferred financing costs of $37.3 million , as contemplated by the Plan. Under the Plan, the Company also issued $1.0 billion of Successor Notes, net of $49.5 million of deferred financing costs. The Successor Notes and the related proceeds held in escrow were included on the Company’s unaudited condensed consolidated balance sheet at March 31, 2017. The new debt instruments issued in accordance with the Plan are further described in Note 13. “Long-term Debt.” (h) Represents an accrual to account for amounts paid subsequent to the Effective Date for professional fees and certain unsecured claims and settlements set forth in the Plan. (i) Liabilities subject to compromise include secured and unsecured liabilities incurred prior to the Petition Date. These liabilities represent the amounts expected to be allowed on known or potential claims to be resolved through the Chapter 11 Cases and remain subject to future adjustments based on negotiated settlements with claimants, actions of the Bankruptcy Court, rejection of executory contracts, proofs of claims or other events. Additionally, liabilities subject to compromise also include certain items that were assumed under the Plan, and as such, were subsequently reclassified to liabilities not subject to compromise. Generally, actions to enforce or otherwise effect payment of prepetition liabilities are subject to the injunction provisions set forth in the Plan, as discussed in Note 19. “Commitments and Contingencies”. Liabilities subject to compromise consisted of the following immediately prior to emergence and at December 31, 2016: Predecessor April 1, 2017 December 31, 2016 (Dollars in millions) Debt (1) $ 8,077.4 $ 8,080.3 Interest payable 172.6 172.6 Environmental liabilities 61.9 61.9 Trade payables 55.2 58.4 Postretirement benefit obligations (2) 23.0 34.6 Other accrued liabilities 26.6 32.4 Liabilities subject to compromise $ 8,416.7 $ 8,440.2 (1) Includes $7,768.3 million and $7,771.2 million of first lien, second lien and unsecured debt at April 1, 2017 and December 31, 2016, respectively, and $257.3 million of derivative contract terminations, and $51.8 million of liabilities secured by prepetition letters of credit at April 1, 2017 and December 31, 2016. (2) Includes liabilities for unfunded non-qualified pension plans, all the participants of which are former employees. (j) Reflects the impacts of the reorganization adjustments: (Dollars in millions) Total pre-tax gain on plan effects, see also (b) above $ 3,031.2 Cancellation of Predecessor Common Stock 0.2 Cancellation of Predecessor Additional paid-in capital 2,423.9 Cancellation of Predecessor Treasury stock (371.9 ) Successor debt issuance costs and other items, see also (f) and (g) above 50.9 Net impact on accumulated deficit $ 5,134.3 (k) Represents adjustment to increase the book value of coal inventories to their estimated fair value, less costs to sell the inventories. (l) Represents adjustments comprising $228.5 million related to assets classified as held-for-sale at March 31, 2017 which were reclassified as held-for-use and considered in connection with the valuations described in (m) below, $89.5 million to write off certain existing short-term mine development costs, and $15.0 million of various prepaid assets deemed to have no future utility subsequent to the Effective Date. (m) Represents a $3,461.4 million reduction in property, plant and equipment to estimated fair value as discussed below: Predecessor Fresh Start Adjustments Successor (Dollars in millions) Land and coal interests $ 10,297.7 $ (6,511.8 ) $ 3,785.9 Buildings and improvements 1,479.3 (1,013.2 ) 466.1 Machinery and equipment 2,143.8 (1,203.3 ) 940.5 Less: Accumulated depreciation, depletion and amortization (5,266.9 ) 5,266.9 — Net impact on accumulated deficit $ 8,653.9 $ (3,461.4 ) $ 5,192.5 The fair value of land and coal interests, excluding the asset related to the Company’s asset retirement obligations described below, was established at $3,504.7 million utilizing a DCF model and the market approach. The market approach was used to provide a starting value of the coal mineral reserves without consideration for economic obsolescence. The DCF model was based on assumptions market participants would use in the pricing of these assets as well as projections of revenues and expenditures that would be incurred to mine or maintain these coal reserves through the life of mine. The basis of the DCF analysis was the Company’s prepared projections which included a variety of estimates and assumptions, such as pricing and demand for coal. The Company’s pricing was based on its view of the market taking into account third-party forward pricing curves adjusted for the quality of products sold by the Company. The fair value of land and coal interests also includes $281.2 million corresponding to the asset retirement obligation discussed in item (q) below. The fair value of buildings and improvements and machinery and equipment were set at $466.1 million and $940.5 million , respectively, utilizing both market and cost approaches. The market approach was used to estimate the value of assets where detailed information for the asset was available and an active market was identified with a sufficient number of sales of comparable property that could be independently verified through reliable sources. The cost approach was utilized where there were limitations in the secondary equipment market to derive values from. The first step in the cost approach is the estimation of the cost required to replace the asset via construction or purchasing a new asset with similar utility adjusting for depreciation due to physical deterioration, functional obsolescence due to technology changes and economic obsolescence due to external factors such as regulatory changes. Useful lives were assigned to all assets based on remaining future economic benefit of each asset. (n) Primarily to recognize fair value of $314.9 million inherent in certain U.S. coal supply agreements as a result of favorable differences between contract terms and estimated market terms for the same coal products, partially offset by a reduction in the fair value of certain equity method investments. The intangible asset related to coal supply agreements will be amortized on a per ton shipped basis through 2025, predominately over the next three years. See also Note 9. “Intangible Contract Assets and Liabilities.” (o) Represents $32.6 million to account for the short-term portion of the value of certain contract-based intangibles primarily consisting of unutilized capacity of certain port and rail take-or-pay contracts, partially offset by $15.7 million related to liabilities classified as held-for-sale at March 31, 2017 which were reclassified as held-for-use and considered in connection with the valuations described in (m) above, and various other fair value adjustments. The intangible liabilities related to port and rail take-or-pay contracts will be amortized ratably over the terms of each contact, which vary in duration through 2043. (p) Represents the tax impact of fresh start reporting. See also Note 12. “Income Taxes.” (q) Represents the fair value adjustment related to the Company’s asset retirement obligations which was calculated using DCF models based on current mine plans. The credit-adjusted, risk-free interest rates utilized to estimate the Company’s asset retirement obligations were 9.36% for its U.S. reclamation obligations and 4.36% for its Australia reclamation obligations. (r) Represents the remeasurement of liabilities associated with the Company’s postretirement benefits obligations as of the Effective Date as the reorganization of the Company pursuant to the Plan represented a remeasurement event under ASC 715 “Compensation - Retirement Benefits.” The relevant discount rate was adjusted to 4.1% from 4.15% used in the Company’s most recent year-end remeasurement process. (s) Represents $83.6 million to account for the long-term portion of the value of contract-based intangibles related to unutilized capacity of port and rail take-or-pay contracts as described in (o) above and $58.7 million to account for the fair value inherent in certain U.S. coal supply agreements as a result of unfavorable differences between contract terms and estimated market terms for the same coal products as described in (n) above, partially offset by a remeasurement reduction of $9.2 million of the Company’s pension liabilities in accordance with ASC 715 as described in (r) above, as the relevant discount rate was adjusted to 4.1% from 4.15% used in the Company’s most recent year-end remeasurement process, and certain other valuation adjustments. (t) Represents the elimination of remaining equity balances in accordance with fresh start reporting requirements. (u) Represents adjustment to increase the book value of noncontrolling interests to fair value based on an estimate of the rights of the noncontrolling interests.
Pre-tax gain on the settlement of the liabilities subject to compromise	The following is the calculation of the total pre-tax gain on the settlement of the liabilities subject to compromise. (Dollars in millions) Liabilities subject to compromise $ 8,416.7 Less amounts issued to settle claims: Successor Common Stock (at par) (0.7 ) Successor Series A Convertible Preferred Stock (1,305.4 ) Successor Additional paid-in capital (1,774.9 ) Issuance of Successor Notes (1,000.0 ) Issuance of Successor Term Loan (950.0 ) Cash payments and accruals for claims and professional fees (336.4 ) Other: Write-off of Predecessor debt issuance costs, see also (e) below (18.1 ) Total pre-tax gain on plan effects, see also (j) below $ 3,031.2 Liabilities subject to compromise consisted of the following immediately prior to emergence and at December 31, 2016: Predecessor April 1, 2017 December 31, 2016 (Dollars in millions) Debt (1) $ 8,077.4 $ 8,080.3 Interest payable 172.6 172.6 Environmental liabilities 61.9 61.9 Trade payables 55.2 58.4 Postretirement benefit obligations (2) 23.0 34.6 Other accrued liabilities 26.6 32.4 Liabilities subject to compromise $ 8,416.7 $ 8,440.2 (1) Includes $7,768.3 million and $7,771.2 million of first lien, second lien and unsecured debt at April 1, 2017 and December 31, 2016, respectively, and $257.3 million of derivative contract terminations, and $51.8 million of liabilities secured by prepetition letters of credit at April 1, 2017 and December 31, 2016. (2) Includes liabilities for unfunded non-qualified pension plans, all the participants of which are former employees.
Schedule of sources and uses of cash and restricted cash at emergence	The following table reflects the sources and uses of cash and restricted cash at emergence: (Dollars in millions) Sources: Private placement and rights offering $ 1,500.0 Net proceeds from Senior Secured Term Loan 912.7 Escrowed interest from Successor Notes offering 8.0 Net impact on collateral requirements 11.6 Uses: Payments to secured lenders (3,489.2 ) Professional fees (8.3 ) Securitization facility deferred financing costs (3.9 ) Total cash outflow at emergence $ (1,069.1 )
Impact of the reorganization adjustments	Reflects the impacts of the reorganization adjustments: (Dollars in millions) Total pre-tax gain on plan effects, see also (b) above $ 3,031.2 Cancellation of Predecessor Common Stock 0.2 Cancellation of Predecessor Additional paid-in capital 2,423.9 Cancellation of Predecessor Treasury stock (371.9 ) Successor debt issuance costs and other items, see also (f) and (g) above 50.9 Net impact on accumulated deficit $ 5,134.3
Adjustments to property, plant and equipment	Represents a $3,461.4 million reduction in property, plant and equipment to estimated fair value as discussed below: Predecessor Fresh Start Adjustments Successor (Dollars in millions) Land and coal interests $ 10,297.7 $ (6,511.8 ) $ 3,785.9 Buildings and improvements 1,479.3 (1,013.2 ) 466.1 Machinery and equipment 2,143.8 (1,203.3 ) 940.5 Less: Accumulated depreciation, depletion and amortization (5,266.9 ) 5,266.9 — Net impact on accumulated deficit $ 8,653.9 $ (3,461.4 ) $ 5,192.5
Schedule of reorganization items, net	The Company’s reorganization items for the period January 1 through April 1, 2017, and the three and nine months ended September 30, 2016 consisted of the following: Predecessor Three Months Ended September 30, 2016 January 1 through April 1, 2017 Nine Months Ended September 30, 2016 (Dollars in millions) Gain on settlement of claims (per above) $ — $ (3,031.2 ) $ — Fresh start adjustments, net (per above) — 3,363.1 — Fresh start income tax adjustments, net — 253.9 — Loss on termination of derivative contracts — — 75.2 Professional fees 31.1 42.5 52.7 Accounts payable settlement gains (0.5 ) (0.7 ) (0.7 ) Interest income (0.9 ) (0.4 ) (1.1 ) Other — — (1.0 ) Reorganization items, net $ 29.7 $ 627.2 $ 125.1 Cash paid for “Reorganization items, net” $ 30.7 $ 45.8 $ 30.7

Discontinued Operations (Tables

Discontinued Operations (Tables)	9 Months Ended
	Sep. 30, 2017
Discontinued Operations and Disposal Groups [Abstract]
Summarized results of discontinued operations	Results from discontinued operations were as follows during the periods April 2 through September 30, 2017 , January 1 through April 1, 2017 , and the three and nine months ended September 30, 2016 : Successor Predecessor Successor Predecessor Three Months Ended September 30, 2017 Three Months Ended September 30, 2016 April 2 through September 30, 2017 January 1 through April 1, 2017 Nine Months Ended September 30, 2016 (Dollars in millions) Loss from discontinued operations, net of income taxes $ (3.7 ) $ (38.1 ) $ (6.4 ) $ (16.2 ) $ (44.5 ) Assets and Liabilities of Discontinued Operations Assets and liabilities classified as discontinued operations included in the Company’s condensed consolidated balance sheets were as follows: Successor Predecessor September 30, 2017 December 31, 2016 (Dollars in millions) Assets: Other current assets $ 0.2 $ 0.2 Investments and other assets — 15.9 Total assets classified as discontinued operations $ 0.2 $ 16.1 Liabilities: Accounts payable and accrued expenses $ 46.2 $ 55.9 Other noncurrent liabilities 185.5 198.5 Liabilities subject to compromise — 20.9 Total liabilities classified as discontinued operations $ 231.7 $ 275.3

Inventories (Tables)

Inventories (Tables)	9 Months Ended
	Sep. 30, 2017
Inventory Disclosure [Abstract]
Inventories	Inventories as of September 30, 2017 and December 31, 2016 consisted of the following: Successor Predecessor September 30, 2017 December 31, 2016 (Dollars in millions) Materials and supplies $ 104.0 $ 104.5 Raw coal 58.0 29.6 Saleable coal 145.7 69.6 Total $ 307.7 $ 203.7

Derivatives and Fair Value Me34

Derivatives and Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Classification and amounts of pre-tax gains and losses related to the Company's non coal-trading hedges	The tables below show the classification and amounts of pre-tax gains and losses related to the Company’s Corporate Hedging derivatives: Successor Three Months Ended September 30, 2017 Financial Instrument Income Statement Classification of (Losses) Gains Total gain recognized in income Gain realized in income on derivatives Unrealized loss recognized in income on non- designated derivatives (Dollars in millions) Foreign currency option contracts Operating costs and expenses $ 5.6 $ 7.3 $ (1.7 ) Total $ 5.6 $ 7.3 $ (1.7 ) Predecessor Three Months Ended September 30, 2016 Financial Instrument Income Statement Classification of (Losses) Gains Total loss recognized in income Loss reclassified from other comprehensive income into income (Loss) gain realized in income on derivatives Unrealized gain (loss) recognized in income on non- designated derivatives (Dollars in millions) Commodity swap contracts Operating costs and expenses $ (19.4 ) $ (19.4 ) $ — $ — Foreign currency forward contracts Operating costs and expenses (28.0 ) (28.0 ) — — Total $ (47.4 ) $ (47.4 ) $ — $ — Successor April 2 through September 30, 2017 Financial Instrument Income Statement Total gain recognized in income Gain realized in income on derivatives Unrealized gain recognized in income on non- designated derivatives (Dollars in millions) Foreign currency option contracts Operating costs and expenses $ 8.5 $ 7.0 $ 1.5 Total $ 8.5 $ 7.0 $ 1.5 Predecessor January 1 through April 1, 2017 Financial Instrument Income Statement Total loss recognized in income Loss reclassified from other comprehensive loss into income (Loss) gain realized in income on derivatives Unrealized gain (loss) recognized in income on non- designated derivatives (Dollars in millions) Commodity swap contracts Operating costs and expenses $ (11.0 ) $ (11.0 ) $ — $ — Foreign currency forward contracts Operating costs and expenses (16.6 ) (16.6 ) — — Total $ (27.6 ) $ (27.6 ) $ — $ — Predecessor Nine Months Ended September 30, 2016 Financial Instrument Income Statement Total loss recognized in income Loss reclassified from other comprehensive income into income (1) (Loss) gain realized in income on derivatives Unrealized gain (loss) recognized in income on non- designated derivatives (Dollars in millions) Commodity swap contracts Operating costs and expenses $ (78.3 ) $ (66.4 ) $ (11.9 ) $ — Commodity swap contracts Reorganization items, net (38.8 ) — (38.8 ) — Foreign currency forward contracts Operating costs and expenses (119.4 ) (122.1 ) 2.7 — Foreign currency forward contracts Reorganization items, net (36.4 ) — (36.4 ) — Total $ (272.9 ) $ (188.5 ) $ (84.4 ) $ — (1) Includes the reclassification from “Accumulated other comprehensive income (loss)” into earnings of $13.6 million and $9.0 million of previously unrecognized losses on foreign currency and fuel contracts, respectively, monetized in the first quarter of 2016.
Fair Value, Assets Measured on Recurring Basis [Table Text Block]	The following tables set forth the hierarchy of the Company’s net financial asset positions for which fair value is measured on a recurring basis: Successor September 30, 2017 Level 1 Level 2 Level 3 Total (Dollars in millions) Foreign currency contracts $ — $ 8.6 $ — $ 8.6 Total net financial assets $ — $ 8.6 $ — $ 8.6
Carrying amounts and estimated fair values of the Company's debt	The carrying amounts and estimated fair values of the Company’s long-term debt as of September 30, 2017 are summarized as follows: Successor September 30, 2017 Carrying Estimated (Dollars in millions) Long-term debt $ 1,659.1 $ 1,744.3

Coal Trading (Tables)

Coal Trading (Tables)	9 Months Ended
	Sep. 30, 2017
Coal Trading [Abstract]
Trading revenues by type of instrument	Trading revenues (losses) recognized during the periods presented below were as follows: Successor Predecessor Successor Predecessor Trading Revenues (Losses) by Type of Instrument Three Months Ended September 30, 2017 Three Months Ended September 30, 2016 April 2 through September 30, 2017 January 1 through April 1, 2017 Nine Months Ended September 30, 2016 (Dollars in millions) Futures, swaps and options $ (17.1 ) $ (19.6 ) $ (24.4 ) $ (10.2 ) $ (42.7 ) Physical purchase/sale contracts 36.5 22.3 49.0 25.2 59.2 Total trading revenues $ 19.4 $ 2.7 $ 24.6 $ 15.0 $ 16.5
Fair value of assets and liabilities from coal trading activities and related balance sheet offsetting disclosures	The fair value of assets and liabilities from coal trading activities presented on a gross and net basis as of September 30, 2017 and December 31, 2016 is set forth below: Affected Line Item in the Condensed Consolidated Balance Sheets Gross Amounts of Recognized Assets (Liabilities) Gross Amounts Offset in the Condensed Consolidated Balance Sheets Variation Margin Posted (1) Net Amounts of Assets (Liabilities) Presented in the Condensed Consolidated Balance Sheets (Dollars in millions) Successor Fair Value as of September 30, 2017 Assets from coal trading activities, net $ 127.1 $ (124.6 ) $ — $ 2.5 Liabilities from coal trading activities, net (157.5 ) 124.6 31.9 (1.0 ) Total, net $ (30.4 ) $ — $ 31.9 $ 1.5 Predecessor Fair Value as of December 31, 2016 Assets from coal trading activities, net $ 191.2 $ (190.5 ) $ — $ 0.7 Liabilities from coal trading activities, net (249.1 ) 190.5 57.4 (1.2 ) Total, net $ (57.9 ) $ — $ 57.4 $ (0.5 ) (1) None of the net variation margin posted at September 30, 2017 and December 31, 2016, respectively, related to cash flow hedges.
Fair value coal trading net assets (liabilities) measured on recurring basis	The following tables set forth the hierarchy of the Company’s net financial asset (liability) coal trading positions for which fair value is measured on a recurring basis as of September 30, 2017 and December 31, 2016 : Successor September 30, 2017 Level 1 Level 2 Level 3 Total (Dollars in millions) Futures, swaps and options $ — $ 0.5 $ — $ 0.5 Physical purchase/sale contracts — 1.0 — 1.0 Total net financial assets $ — $ 1.5 $ — $ 1.5 Predecessor December 31, 2016 Level 1 Level 2 Level 3 Total (Dollars in millions) Futures, swaps and options $ — $ (0.1 ) $ — $ (0.1 ) Physical purchase/sale contracts — 0.7 (1.1 ) (0.4 ) Total net financial assets (liabilities) $ — $ 0.6 $ (1.1 ) $ (0.5 )
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation	The following table summarizes the changes in the Company’s recurring Level 3 net financial liabilities: Predecessor Successor Predecessor Three Months Ended September 30, 2016 April 2 through September 30, 2017 January 1 through April 1, 2017 Nine Months Ended September 30, 2016 (Dollars in millions) Beginning of period $ (1.1 ) $ (0.7 ) $ (1.1 ) $ (15.6 ) Transfers into Level 3 4.6 — — 5.0 Transfers out of Level 3 (11.1 ) 0.7 0.2 (0.4 ) Total gains realized/unrealized: Included in earnings 2.6 — 0.2 1.2 Sales 0.1 — — — Settlements 4.2 — — 9.1 End of period $ (0.7 ) $ — $ (0.7 ) $ (0.7 )
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings	The following table summarizes the changes in net unrealized gains (losses) relating to Level 3 net financial assets held both as of the beginning and the end of the period: Predecessor Successor Predecessor Three Months Ended September 30, 2016 April 2 through September 30, 2017 January 1 through April 1, 2017 Nine Months Ended September 30, 2016 (Dollars in millions) Changes in unrealized gains (losses) (1) $ 0.1 $ — $ 0.3 $ (0.1 ) (1) Within the unaudited condensed consolidated statements of operations and unaudited condensed consolidated statements of comprehensive income for the periods presented, unrealized gains and losses from Level 3 items are combined with unrealized gains and losses on positions classified in Level 1 or 2, as well as other positions that have been realized during the applicable periods.
Schedule of Trading Securities and Other Trading Assets [Line Items]
Schedule Of Future Realization Of Trading Portfolio [Table Text Block]	As of September 30, 2017 , the timing of the estimated future realization of the value of the Company’s trading portfolio was as follows: Percentage of Year of Expiration Portfolio Total 2017 15 % 2018 82 % 2019 3 % 100 %

Intangible Contract Assets an36

Intangible Contract Assets and Liabilities (Tables)	9 Months Ended
	Sep. 30, 2017
Revenue Recognition [Abstract]
Schedule Of Intangible Assets And Liabilities	The balances and respective balance sheet classifications of such assets and liabilities at September 30, 2017, net of accumulated amortization, are set forth in the following table: Successor September 30, 2017 (Dollars in millions) Assets Liabilities Net Total Coal supply agreements $ 231.6 $ (46.9 ) $ 184.7 Take-or-pay contracts — (108.4 ) (108.4 ) Total $ 231.6 $ (155.3 ) $ 76.3 Balance sheet classification: Investments and other assets $ 231.6 $ — $ 231.6 Accounts payable and accrued expenses — (35.7 ) (35.7 ) Other noncurrent liabilities — (119.6 ) (119.6 ) Total $ 231.6 $ (155.3 ) $ 76.3

Property, Plant, Equipment an37

Property, Plant, Equipment and Mine Development (Tables)	9 Months Ended
	Sep. 30, 2017
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	The composition of property, plant, equipment and mine development, net, as of September 30, 2017 and December 31, 2016 is set forth in the table below. Refer to Note 3. “Emergence from the Chapter 11 Cases and Fresh Start Reporting” for details regarding the impact of fresh start reporting on property, plant, equipment and mine development. Successor Predecessor September 30, 2017 December 31, 2016 (Dollars in millions) Land and coal interests $ 3,819.7 $ 10,330.8 Buildings and improvements 457.3 1,507.6 Machinery and equipment 1,077.4 2,130.2 Less: Accumulated depreciation, depletion and amortization (271.8 ) (5,191.9 ) Total, net $ 5,082.6 $ 8,776.7

Long-term Debt (Tables)

Long-term Debt (Tables)	9 Months Ended
	Sep. 30, 2017
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	The Company’s total indebtedness as of September 30, 2017 and December 31, 2016 is set forth in the table below. As of December 31, 2016, substantially all of the Company’s long-term debt, with the exception of capital lease obligations, was recorded in “Liabilities subject to compromise” in the consolidated balance sheets. Refer to Note 3. “Emergence from the Chapter 11 Cases and Fresh Start Reporting” for additional information. Successor Predecessor September 30, 2017 December 31, 2016 (Dollars in millions) 6.00% Senior Secured Notes due March 2022 $ 500.0 $ — 6.375% Senior Secured Notes due March 2025 500.0 — Senior Secured Term Loan due 2022 645.0 — 2013 Revolver — 1,558.1 2013 Term Loan Facility due September 2020 — 1,162.3 6.00% Senior Notes due November 2018 — 1,518.8 6.50% Senior Notes due September 2020 — 650.0 6.25% Senior Notes due November 2021 — 1,339.6 10.00% Senior Secured Second Lien Notes due March 2022 — 979.4 7.875% Senior Notes due November 2026 — 247.8 Convertible Junior Subordinated Debentures due December 2066 — 386.1 Capital lease and other obligations 84.0 20.1 Less: Debt issuance costs (69.9 ) (70.8 ) 1,659.1 7,791.4 Less: Current portion of long-term debt 47.1 20.2 Less: Liabilities subject to compromise — 7,771.2 Long-term debt $ 1,612.0 $ —

Pension and Postretirement Be39

Pension and Postretirement Benefit Costs (Tables)	9 Months Ended
	Sep. 30, 2017
Defined benefit pension plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Schedule of Net Benefit Costs	Net periodic pension (income) cost included the following components: Successor Predecessor Successor Predecessor Three Months Ended September 30, 2017 Three Months Ended September 30, 2016 April 2 through September 30, 2017 January 1 through April 1, 2017 Nine Months Ended September 30, 2016 (Dollars in millions) Service cost for benefits earned $ 0.5 $ 0.7 $ 1.1 $ 0.6 $ 2.0 Interest cost on projected benefit obligation 9.4 10.3 18.7 9.7 31.0 Expected return on plan assets (11.2 ) (11.3 ) (22.4 ) (11.0 ) (33.9 ) Amortization of prior service cost and net actuarial loss — 6.3 — 6.4 18.8 Net periodic pension (income) cost $ (1.3 ) $ 6.0 $ (2.6 ) $ 5.7 $ 17.9
Postretirement benefit plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Schedule of Net Benefit Costs	Net periodic postretirement benefit cost included the following components: Successor Predecessor Successor Predecessor Three Months Ended September 30, 2017 Three Months Ended September 30, 2016 April 2 through September 30, 2017 January 1 through April 1, 2017 Nine Months Ended September 30, 2016 (Dollars in millions) Service cost for benefits earned $ 2.3 $ 2.6 $ 4.6 $ 2.3 $ 7.8 Interest cost on accumulated postretirement benefit obligation 8.2 8.8 16.5 8.4 26.4 Amortization of prior service cost and net actuarial loss — 2.4 — 3.2 7.1 Net periodic postretirement benefit cost $ 10.5 $ 13.8 $ 21.1 $ 13.9 $ 41.3

Accumulated Other Comprehensi40

Accumulated Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 2017
Equity [Abstract]
After-tax components of comprehensive income (loss)	The following table sets forth the after-tax components of accumulated other comprehensive income (loss) and changes thereto recorded during the Predecessor period January 1 through April 1, 2017 and the Successor period April 2 through September 30, 2017 : Foreign Currency Translation Adjustment Net Actuarial Loss Associated with Postretirement Plans and Workers’ Compensation Obligations Prior Service Cost Associated with Postretirement Plans Cash Flow Hedges Total Accumulated Other Comprehensive Income (Loss) (Dollars in millions) Predecessor Company December 31, 2016 $ (148.2 ) $ (256.3 ) $ 21.7 $ (94.2 ) $ (477.0 ) Reclassification from other comprehensive income to earnings — 5.8 (1.4 ) 18.6 23.0 Current period change 5.5 — — — 5.5 Fresh start reporting adjustment 142.7 250.5 (20.3 ) 75.6 448.5 April 1, 2017 $ — $ — $ — $ — $ — Successor Company Current period change 1.8 — — — 1.8 September 30, 2017 $ 1.8 $ — $ — $ — $ 1.8
Reclassification out of accumulated other comprehensive income (loss)	The following table provides additional information regarding items reclassified out of “Accumulated other comprehensive income (loss)” into earnings during the Predecessor periods January 1 through April 1, 2017 and the three and nine months ended September 30, 2016 : Amount reclassified from accumulated other comprehensive income (loss) (1) Predecessor Details about accumulated other comprehensive income (loss) components Three Months Ended September 30, 2016 January 1 through April 1, 2017 Nine Months Ended September 30, 2016 Affected line item in the unaudited condensed consolidated statement of operations (Dollars in millions) Net actuarial loss associated with postretirement plans and workers’ compensation obligations: Postretirement health care and life insurance benefits $ (5.2 ) $ (5.5 ) $ (15.4 ) Operating costs and expenses Defined benefit pension plans (5.1 ) (5.3 ) (15.3 ) Operating costs and expenses Defined benefit pension plans (1.1 ) (1.0 ) (3.2 ) Selling and administrative expenses Insignificant items 3.0 2.7 8.8 (8.4 ) (9.1 ) (25.1 ) Total before income taxes 3.1 3.3 9.3 Income tax benefit $ (5.3 ) $ (5.8 ) $ (15.8 ) Total after income taxes Prior service credit associated with postretirement plans: Postretirement health care and life insurance benefits $ 2.8 $ 2.3 $ 8.3 Operating costs and expenses Defined benefit pension plans (0.1 ) (0.1 ) (0.3 ) Operating costs and expenses 2.7 2.2 8.0 Total before income taxes (1.0 ) (0.8 ) (3.0 ) Income tax provision $ 1.7 $ 1.4 $ 5.0 Total after income taxes Cash flow hedges: Foreign currency cash flow hedge contracts $ (28.0 ) $ (16.6 ) $ (122.1 ) Operating costs and expenses Fuel and explosives commodity swaps (19.4 ) (11.0 ) (66.4 ) Operating costs and expenses Insignificant items (0.1 ) (0.1 ) (0.4 ) (47.5 ) (27.7 ) (188.9 ) Total before income taxes 17.6 9.1 69.9 Income tax benefit $ (29.9 ) $ (18.6 ) $ (119.0 ) Total after income taxes (1) Presented as gains (losses) in the unaudited condensed consolidated statements of operations.

Earnings per Share (EPS) (Table

Earnings per Share (EPS) (Tables)	9 Months Ended
	Sep. 30, 2017
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. Successor Predecessor Successor Predecessor Three Months Ended September 30, 2017 Three Months Ended September 30, 2016 April 2 through September 30, 2017 January 1 through April 1, 2017 Nine Months Ended September 30, 2016 (In millions, except per share data) EPS numerator: Income (loss) from continuing operations, net of income taxes $ 233.7 $ (97.7 ) $ 335.1 $ (195.5 ) $ (488.6 ) Less: Series A Convertible Preferred Stock dividends 23.5 — 138.6 — — Less: Net income attributable to noncontrolling interests 5.1 1.8 8.9 4.8 3.5 Income (loss) from continuing operations attributable to common stockholders, before allocation of earnings to participating securities 205.1 (99.5 ) 187.6 (200.3 ) (492.1 ) Less: Earnings allocated to participating securities 51.6 — 50.6 — — Income (loss) from continuing operations attributable to common stockholders, after allocation of earnings to participating securities (1) 153.5 (99.5 ) 137.0 (200.3 ) (492.1 ) Loss from discontinued operations, net of income taxes (3.7 ) (38.1 ) (6.4 ) (16.2 ) (44.5 ) Less: Loss from discontinued operations allocated to participating securities (0.9 ) — (1.7 ) — — Loss from discontinued operations attributable to common stockholders, after allocation of earnings to participating securities (2.8 ) (38.1 ) (4.7 ) (16.2 ) (44.5 ) Net income (loss) attributable to common stockholders, after allocation of earnings to participating securities (1) $ 150.7 $ (137.6 ) $ 132.3 $ (216.5 ) $ (536.6 ) EPS denominator: Weighted average shares outstanding — basic 101.6 18.3 99.2 18.3 18.3 Impact of dilutive securities 1.5 — 1.0 — — Weighted average shares outstanding — diluted (2) 103.1 18.3 100.2 18.3 18.3 Basic EPS attributable to common stockholders: Income (loss) from continuing operations $ 1.51 $ (5.44 ) $ 1.38 $ (10.93 ) $ (26.91 ) Loss from discontinued operations (0.03 ) (2.09 ) (0.05 ) (0.88 ) (2.43 ) Net income (loss) attributable to common stockholders $ 1.48 $ (7.53 ) $ 1.33 $ (11.81 ) $ (29.34 ) Diluted EPS attributable to common stockholders: Income (loss) from continuing operations $ 1.49 $ (5.44 ) $ 1.37 $ (10.93 ) $ (26.91 ) Loss from discontinued operations (0.02 ) (2.09 ) (0.05 ) (0.88 ) (2.43 ) Net income (loss) attributable to common stockholders $ 1.47 $ (7.53 ) $ 1.32 $ (11.81 ) $ (29.34 ) (1) The reallocation adjustment for participating securities to arrive at the numerator to calculate diluted EPS was $0.6 million for the Successor three months ended September 30, 2017 and $0.4 million for the Successor period April 2 through September 30, 2017. (2) The two-class method assumes that participating securities are not exercised or converted. As such, weighted average diluted shares outstanding excluded 34.2 million shares and 36.7 million shares related to the participating securities for the Successor three months ended September 30, 2017 and the Successor period April 2 through September 30, 2017, respectively.

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2017
Segment Reporting [Abstract]
Reportable segment results	Reportable segment results were as follows: Successor Predecessor Successor Predecessor Three Months Ended September 30, 2017 Three Months Ended September 30, 2016 April 2 through September 30, 2017 January 1 through April 1, 2017 Nine Months Ended September 30, 2016 Revenues: Powder River Basin Mining $ 420.9 $ 419.6 $ 786.3 $ 394.3 $ 1,062.2 Midwestern U.S. Mining 207.7 211.0 402.6 193.2 599.6 Western U.S. Mining 155.7 162.4 281.1 149.7 387.0 Australian Metallurgical Mining 415.9 232.5 703.7 328.9 682.8 Australian Thermal Mining 265.8 197.9 505.0 224.8 561.4 Trading and Brokerage 19.4 2.7 24.6 15.0 16.5 Corporate and Other (8.2 ) (19.0 ) 32.2 20.3 (35.0 ) Total $ 1,477.2 $ 1,207.1 $ 2,735.5 $ 1,326.2 $ 3,274.5 Adjusted EBITDA: Powder River Basin Mining $ 112.7 $ 123.9 $ 197.5 $ 91.7 $ 278.3 Midwestern U.S. Mining 49.5 59.1 96.0 50.0 172.4 Western U.S. Mining 34.5 34.3 79.4 50.0 83.2 Australian Metallurgical Mining 143.1 (34.5 ) 215.0 109.6 (121.0 ) Australian Thermal Mining 97.8 48.9 203.7 75.6 137.2 Trading and Brokerage 2.7 (9.4 ) (2.4 ) 8.8 (41.3 ) Corporate and Other (1) (29.0 ) (92.1 ) (60.1 ) (44.4 ) (270.8 ) Total $ 411.3 $ 130.2 $ 729.1 $ 341.3 $ 238.0 (1) Includes a gain of $19.7 million related to the sale of Dominion Terminal Associates during the predecessor period January 1 through April 1, 2017 and a gain of $68.1 million related to the 2016 Settlement Agreement described in Note 5. “Discontinued Operations” during the predecessor nine months ended September 30, 2016
Reconciliation of Adjusted EBITDA to consolidated loss from continuing operations, net of income taxes	A reconciliation of consolidated income (loss) from continuing operations, net of income taxes to Adjusted EBITDA follows: Successor Predecessor Successor Predecessor Three Months Ended September 30, 2017 Three Months Ended September 30, 2016 April 2 through September 30, 2017 January 1 through April 1, 2017 Nine Months Ended September 30, 2016 (Dollars in millions) Income (loss) from continuing operations, net of income taxes $ 233.7 $ (97.7 ) $ 335.1 $ (195.5 ) $ (488.6 ) Depreciation, depletion and amortization 194.5 117.8 342.8 119.9 345.5 Asset retirement obligation expenses 11.3 12.7 22.3 14.6 37.3 Selling and administrative expenses related to debt restructuring — — — — 21.5 Asset impairment — — — 30.5 17.2 Change in deferred tax asset valuation allowance related to equity affiliates (3.4 ) (0.6 ) (7.7 ) (5.2 ) (0.6 ) Interest expense 42.4 58.5 83.8 32.9 243.7 Loss on early debt extinguishment 12.9 — 12.9 — — Interest income (2.0 ) (1.3 ) (3.5 ) (2.7 ) (4.0 ) Break fees related to terminated asset sales — — (28.0 ) — — Unrealized losses (gains) on non-coal trading derivative contracts 1.7 — (1.5 ) — — Unrealized losses (gains) on economic hedges 10.8 21.9 1.4 (16.6 ) 49.1 Coal inventory revaluation — — 67.3 — — Take-or-pay contract-based intangible recognition (6.5 ) — (16.4 ) — — Reorganization items, net — 29.7 — 627.2 125.1 Income tax benefit (84.1 ) (10.8 ) (79.4 ) (263.8 ) (108.2 ) Total Adjusted EBITDA $ 411.3 $ 130.2 $ 729.1 $ 341.3 $ 238.0

Basis of Presentation - Fresh S

Basis of Presentation - Fresh Start (Details)	Apr. 03, 2017
Predecessor
Fresh-Start Adjustment [Line Items]
Voting shares received upon reorganization (less than 50%)	50.00%

Emergence from the Chapter 1144

Emergence from the Chapter 11 Cases and Fresh Start Reporting - Summary of Provisions (Details) - Successor - Effect of Plan	Apr. 01, 2017USD ($)shares
Fresh-Start Adjustment [Line Items]
Stock and warrants issued, value	$ 750,000,000
Warrants issued (in shares)	6,200,000
First Lien Senior Secured Notes | Senior Notes
Fresh-Start Adjustment [Line Items]
Principal amount	1,000,000,000
First LIen Credit Facility | Line of Credit
Fresh-Start Adjustment [Line Items]
Principal amount	950,000,000
Series A Preferred Stock
Fresh-Start Adjustment [Line Items]
Preferred stock	$ 750,000,000
Preferred stock, shares issued (in shares) | shares	30,000,000
Common Stock
Fresh-Start Adjustment [Line Items]
Stock issued (in shares)	$ 70,900,000

Emergence from the Chapter 1145

Emergence from the Chapter 11 Cases and Fresh Start Reporting - Treatment of Classified Claims and Interest (Details) - Effect of Plan	Apr. 01, 2017USD ($)$ / shares
Second Lien Notes Claims (Classes 2A - 2D)
Fresh-Start Adjustment [Line Items]
Cash claims, amount to be recovered	$ 450,000,000
Common stock, par value per share (in dollars per share) | $ / shares	$ 0.01
United Mine Workers of America 1974 Pension Plan Claim (Classes 7A - 7E)
Fresh-Start Adjustment [Line Items]
Cash claims, amount to be recovered	$ 75
Cash claims, payment period	5 years
Unsecured Subordinated Debentures Claims (Class 8A)
Fresh-Start Adjustment [Line Items]
Fees and expenses of trustee	$ 350,000
Ceiling of penny warrants exercisable, as percent of common stock	1.00%
Peabody Energy | General Unsecured Claims
Fresh-Start Adjustment [Line Items]
Cash amount from which claimants receive pro rata share	$ 5,000,000
Cash claims, maximum additional amount to be recovered by claimants under plan	$ 2,000,000
Peabody Energy | Convenience Claims, Class 6A
Fresh-Start Adjustment [Line Items]
Cash claims, threshold percent	72.50%
Encumbered Guarantor Debtors | General Unsecured Claims
Fresh-Start Adjustment [Line Items]
Cash claims, amount to be recovered	$ 75,000,000
Encumbered Guarantor Debtors | Convenience Claims, Class 6B
Fresh-Start Adjustment [Line Items]
Cash claims, threshold percent	72.50%
Maximum | Peabody Energy | Convenience Claims, Class 6A
Fresh-Start Adjustment [Line Items]
Cash claims, amount to be recovered	$ 2,000,000
Maximum | Encumbered Guarantor Debtors | Convenience Claims, Class 6B
Fresh-Start Adjustment [Line Items]
Cash claims, amount to be recovered	$ 0

Emergence from the Chapter 1146

Emergence from the Chapter 11 Cases and Fresh Start Reporting - Issuance of Equity Securities (Details) $ / shares in Units, $ in Millions	Apr. 01, 2017USD ($)days$ / sharesshares	Oct. 30, 2017shares	Sep. 30, 2017shares	Jul. 03, 2017
Effect of Plan
Fresh-Start Adjustment [Line Items]
Common stock, shares issued (in shares)			134,800,000
Warrant
Fresh-Start Adjustment [Line Items]
Warrants unexercised, percent			0.00%
Warrant | Effect of Plan
Fresh-Start Adjustment [Line Items]
Number of securities called by each right	1
Exercise price | $ / shares	$ 0.01
Warrants issued (in shares)	6,200,000
Warrants unexercised, percent				0.10%
Series A Preferred Stock | Preferred Stock | Effect of Plan
Fresh-Start Adjustment [Line Items]
Preferred stock, dividend rate	8.50%
Preferred stock, liquidation preference per share | $ / shares	$ 25
Preferred stock, conversion price (in dollars per share) | $ / shares	$ 16.25
Discount percent of common stock value	35.00%
Minimum number of shares outstanding before redemption of all shares	7,500,000
Redemption price per share (in dollars per share) | $ / shares	$ 25
Holders of stock, conversion threshold, percent	66.66%
Threshold price of common stock | $ / shares	$ 32.50
Threshold trading days | days	45
Threshold consecutive trading days | days	60
Threshold last trading days in consecutive trading period | days	20
Conversion period threshold after initial issuance	3 years
Dividend threshold payable an any 12 month period for fundamental change | $	$ 100
Section 1145 Securities | Effect of Plan
Fresh-Start Adjustment [Line Items]
Stock issued (in shares) | $	$ 704.4
Section 1145 Securities | Common Stock | Effect of Plan
Fresh-Start Adjustment [Line Items]
New shares issued (in shares)	51,200,000
Section 1145 Securities | Warrant | Effect of Plan
Fresh-Start Adjustment [Line Items]
New shares issued (in shares)	2,900,000
Parties to Private Placement and Backstop Commitment Agreement | Section 4(a)(2) Securities | Common Stock | Effect of Plan
Fresh-Start Adjustment [Line Items]
New shares issued (in shares)	4,800,000
Parties to Private Placement and Backstop Commitment Agreement | Section 4(a)(2) Securities | Warrant | Effect of Plan
Fresh-Start Adjustment [Line Items]
New shares issued (in shares)	3,100,000
Parties to Private Placement Agreement | Section 4(a)(2) Securities | Preferred Stock | Effect of Plan
Fresh-Start Adjustment [Line Items]
Stock issued (in shares) | $	$ 750
Parties to Private Placement Agreement | Section 4(a)(2) Securities | Series A Preferred Stock | Preferred Stock | Effect of Plan
Fresh-Start Adjustment [Line Items]
New shares issued (in shares)	30,000,000
Parties to Backstop Commitment Agreement | Section 4(a)(2) Securities | Effect of Plan
Fresh-Start Adjustment [Line Items]
Stock issued (in shares) | $	$ 45.6
Parties to Backstop Commitment Agreement | Section 4(a)(2) Securities | Common Stock | Effect of Plan
Fresh-Start Adjustment [Line Items]
New shares issued (in shares)	3,300,000
Parties to Backstop Commitment Agreement | Section 4(a)(2) Securities | Warrant | Effect of Plan
Fresh-Start Adjustment [Line Items]
New shares issued (in shares)	200,000
2017 Incentive Plan
Fresh-Start Adjustment [Line Items]
Treasury Stock, Shares, Acquired			2,500,000
2017 Incentive Plan | Effect of Plan
Fresh-Start Adjustment [Line Items]
Common stock, shares issued (in shares)			3,500,000
Minimum | Series A Preferred Stock | Preferred Stock | Effect of Plan
Fresh-Start Adjustment [Line Items]
Redemption notice period	30 days
Maximum | Series A Preferred Stock | Preferred Stock | Effect of Plan
Fresh-Start Adjustment [Line Items]
Redemption notice period	60 days
Allowed Claims In Classes 2A, 2B, 2C, 2D And 5B | Rights Offering | Effect of Plan
Fresh-Start Adjustment [Line Items]
Units authorized	54,500,000
Number of securities called by each right	1
Exercise price | $ / shares	$ 13.75
Rights offering, units purchased	51,200,000
Allowed Claims In Classes 2A, 2B, 2C, 2D And 5B | Section 1145 Securities | Common Stock | Effect of Plan
Fresh-Start Adjustment [Line Items]
New shares issued (in shares)	11,600,000
Allowed Claims In Classes 2A, 2B, 2C, 2D And 5B | Parties to Backstop Commitment Agreement | Rights Offering | Effect of Plan
Fresh-Start Adjustment [Line Items]
Rights offering, units purchased	3,300,000
Subsequent Event
Fresh-Start Adjustment [Line Items]
Treasury Stock, Shares, Acquired		1,300,000

Emergence from the Chapter 1147

Emergence from the Chapter 11 Cases and Fresh Start Reporting - Debt Securities (Details) - USD ($)	Sep. 18, 2017	Apr. 03, 2017	Apr. 01, 2017	Feb. 15, 2017
Fresh-Start Adjustment [Line Items]
Debt canceled			$ (950,000,000)
Effect of Plan
Fresh-Start Adjustment [Line Items]
Debt canceled			$ (903,200,000)
6.00% Senior Secured Notes due March 2022 | Senior Notes | Effect of Plan
Fresh-Start Adjustment [Line Items]
Principal amount				$ 500,000,000
Stated interest rate				6.00%
6.00% Senior Secured Notes due March 2022 | Senior Notes | Effect of Plan
Fresh-Start Adjustment [Line Items]
Principal amount				$ 500,000,000
Stated interest rate				6.375%
Successor Credit Agreement | Term Loan | Effect of Plan
Fresh-Start Adjustment [Line Items]
Principal amount		$ 950,000,000
10.00% Senior Secured Second Lien Notes due March 2022 | Senior Notes | Effect of Plan
Fresh-Start Adjustment [Line Items]
Stated interest rate			10.00%
Debt canceled			$ 1,000,000,000
6.50% Senior Notes due September 2020 | Senior Notes | Effect of Plan
Fresh-Start Adjustment [Line Items]
Stated interest rate			6.50%
Debt canceled			$ 650,000,000
6.00% Senior Notes due November 2018 | Senior Notes | Effect of Plan
Fresh-Start Adjustment [Line Items]
Stated interest rate			6.00%
Debt canceled			$ 1,518,800,000
6.25% Senior Notes due November 2021 | Senior Notes | Effect of Plan
Fresh-Start Adjustment [Line Items]
Stated interest rate			6.25%
Debt canceled			$ 1,339,600,000
7.875% Senior Notes due November 2026 | Senior Notes | Effect of Plan
Fresh-Start Adjustment [Line Items]
Stated interest rate			7.875%
Debt canceled			$ 250,000,000
Convertible Junior Subordinated Debentures due December 2066 | Subordinated Debt | Effect of Plan
Fresh-Start Adjustment [Line Items]
Debt canceled			732,500,000
2013 Term Loan Facility | Term Loan | Effect of Plan
Fresh-Start Adjustment [Line Items]
Credit facility canceled			1,170,000,000
2013 Revolver | Effect of Plan
Fresh-Start Adjustment [Line Items]
Credit facility canceled			947,000,000
2013 Revolver | Revolving Credit Facility | Effect of Plan
Fresh-Start Adjustment [Line Items]
Credit facility canceled			1,650,000,000
2013 Revolver | Letter of Credit | Effect of Plan
Fresh-Start Adjustment [Line Items]
Credit facility canceled			$ 675,000,000
London Interbank Offered Rate (LIBOR) | Successor Credit Agreement | Term Loan | Effect of Plan
Fresh-Start Adjustment [Line Items]
Basis spread on variable rate	3.50%	4.50%
Floor interest rate	1.00%	1.00%

Emergence from the Chapter 1148

Emergence from the Chapter 11 Cases and Fresh Start Reporting - Additional Information (Details) - USD ($) $ / shares in Units, shares in Millions	Apr. 01, 2017	Sep. 30, 2017	Jun. 30, 2017	Apr. 03, 2017	Mar. 31, 2017	Feb. 15, 2017	Dec. 31, 2016
Effect of Plan
Fresh-Start Adjustment [Line Items]
Common stock, shares issued (in shares)		134.8
Assets held-for-sale					$ 228,500,000
Write off of mine development costs	$ 89,500,000
Write off of prepaid assets	15,000,000
Successor
Fresh-Start Adjustment [Line Items]
Postconfirmation, preferred stock	1,305,400,000
Postconfirmation, total stockholders' equity	3,131,900,000
Postconfirmation, long-term debt	1,853,700,000
Debt issuance cost		$ 69,900,000
Successor | Effect of Plan
Fresh-Start Adjustment [Line Items]
Final equity value	$ 3,081,000,000
Postconfirmation, common stock, share price (in dollars per share)	$ 22.03
Common stock, shares issued (in shares)	70.9
Common stock, shares outstanding (in shares)	70.9
Common stock, par value per share (in dollars per share)	$ 0.01
Postconfirmation, preferred stock	$ 750,000,000
Discount percent of common stock value	35.00%
Postconfirmation, Common Stock, Initial Share Price Estimate	$ 25
Dividends, common stock, paid in kind, guaranteed period	3 years
Dividends, common stock, paid in kind, annual stated rate	8.50%
Convertible preferred stock, shares issued upon conversion	46.2
Equity ownership percent	42.00%
Postconfirmation, total stockholders' equity	$ 3,105,000,000
Convertible preferred stock, converted shares, fair value	$ 1,305,400,000
Discount rate	4.10%						4.15%
Remeasurement reduction in pension liabilities	$ 9,200,000
2017 Incentive Plan | Effect of Plan
Fresh-Start Adjustment [Line Items]
Common stock reserved for future issuance	14.1
Incentive plan expiration period	10 years
Common stock, shares issued (in shares)		3.5
Minimum | Effect of Plan
Fresh-Start Adjustment [Line Items]
Final equity value	$ 4,200,000,000
Discounted cash flow, estimated weighed average cost of capital, percent	11.00%
Maximum | Effect of Plan
Fresh-Start Adjustment [Line Items]
Final equity value	$ 4,900,000,000
Discounted cash flow, estimated weighed average cost of capital, percent	14.00%
Restricted Stock | 2017 Incentive Plan | Effect of Plan
Fresh-Start Adjustment [Line Items]
Fair value of stock granted	$ 80,000,000
Paid In Kind | Successor | Effect of Plan
Fresh-Start Adjustment [Line Items]
Convertible preferred stock, shares issued upon conversion	13.1
Successor Credit Agreement | Term Loan | Effect of Plan
Fresh-Start Adjustment [Line Items]
Principal amount				$ 950,000,000
Successor Credit Agreement | Term Loan | Successor
Fresh-Start Adjustment [Line Items]
Principal amount			$ 650,000,000
6.00% Senior Secured Notes due March 2022 | Senior Notes | Effect of Plan
Fresh-Start Adjustment [Line Items]
Principal amount						$ 500,000,000
6.00% Senior Secured Notes due March 2022 | Senior Notes | Effect of Plan
Fresh-Start Adjustment [Line Items]
Principal amount						$ 500,000,000
Senior Secured Term Loan | Term Loan | Effect of Plan
Fresh-Start Adjustment [Line Items]
Postconfirmation, long-term debt	$ 950,000,000
Debt issuance cost	37,300,000
Successor Notes | Senior Notes | Effect of Plan
Fresh-Start Adjustment [Line Items]
Debt issuance cost	49,500,000
Principal amount	1,000,000,000
Coal supply agreements | Successor | Effect of Plan
Fresh-Start Adjustment [Line Items]
Finite-lived intangible assets, fair value	$ 314,900,000
Useful life	3 years
Finite-lived intangible assets, fair value, noncurrent	$ 58,700,000
Port And Rail Take Or Pay Contracts | Successor | Effect of Plan
Fresh-Start Adjustment [Line Items]
Finite-lived intangible assets, fair value	32,600,000
Liabilities, held-for-sale					$ 15,700,000
Finite-lived intangible assets, fair value, noncurrent	$ 83,600,000
UNITED STATES | Asset Retirement Obligation | Successor | Effect of Plan
Fresh-Start Adjustment [Line Items]
Risk free interest rate	9.36%
AUSTRALIA | Asset Retirement Obligation | Successor | Effect of Plan
Fresh-Start Adjustment [Line Items]
Risk free interest rate	4.36%

Emergence from the Chapter 1149

Emergence from the Chapter 11 Cases and Fresh Start Reporting - Effect of Reorganization Plan and Fresh Start Adjustments on Balance Sheet (Details)	Apr. 01, 2017USD ($)
Fresh-Start Adjustment, Increase (Decrease), Assets [Abstract]
Fresh-start adjustment, increase (decrease), restricted cash	$ 1,000,000,000
Fresh-Start Adjustment, Increase (Decrease), Liabilities [Abstract]
Fresh-start adjustment, increase (decrease), long-term debt, less current portion	950,000,000
Fresh-Start Adjustment, Increase (Decrease), Stockholders' Equity [Abstract]
Fresh-start adjustment, increase (decrease), Series A preferred stock	1,305,400,000
Net impact on accumulated deficit	5,134,300,000
Effect of Plan
Fresh-Start Adjustment, Increase (Decrease), Assets [Abstract]
Fresh-start adjustment, increase (decrease), cash and cash equivalents	(14,400,000)
Fresh-start adjustment, increase (decrease), accounts receivable, net	0
Fresh-start adjustment, increase (decrease), inventories	0
Fresh-start adjustment, increase (decrease), assets from coal trading activities, net	0
Fresh-start adjustment, increase (decrease), other current assets	(18,100,000)
Fresh-start adjustment, increase (decrease), total current assets	(1,087,200,000)
Fresh-start adjustment, increase (decrease), property, plant, equipment and mine development, net	0
Fresh-start adjustment, increase (decrease), Investments	3,900,000
Fresh-start adjustment, increase (decrease), total assets	(1,083,300,000)
Fresh-Start Adjustment, Increase (Decrease), Liabilities [Abstract]
Fresh-start adjustment, increase (decrease), current portion of long-term debt	9,500,000
Fresh-start adjustment, increase (decrease), liabilities from coal trading activities, net	0
Fresh-start adjustment, increase (decrease), accounts payable and accrued expenses	257,600,000
Fresh-start adjustment, increase (decrease), total current liabilities	267,100,000
Fresh-start adjustment, increase (decrease), long-term debt, less current portion	903,200,000
Fresh-start adjustment, increase (decrease), deferred income taxes	0
Fresh-start adjustment, increase (decrease), asset retirement obligations	0
Fresh-start adjustment, increase (decrease), accrued postretirement benefit costs	0
Fresh-start adjustment, increase (decrease), other noncurrent liabilities	0
Fresh-start adjustment, increase (decrease), total liabilities not subject to compromise	1,170,300,000
Fresh-start adjustment, increase (decrease), liabilities subject to compromise	(8,416,700,000)
Fresh-start adjustment, increase (decrease), total liabilities	(7,246,400,000)
Fresh-Start Adjustment, Increase (Decrease), Stockholders' Equity [Abstract]
Cancellation of Predecessor Treasury stock	371,900,000
Net impact on accumulated deficit	5,134,300,000
Fresh-start adjustment, increase (decrease), Peabody Energy Corporation stockholders' equity	6,163,100,000
Fresh-start adjustment, increase (decrease), noncontrolling interests	0
Fresh-start adjustment, increase (decrease), total stockholders' equity	6,163,100,000
Fresh-start adjustment, increase (decrease), liabilities and stockholders' equity	(1,083,300,000)
Fresh Start Adjustments
Fresh-Start Adjustment, Increase (Decrease), Assets [Abstract]
Fresh-start adjustment, increase (decrease), cash and cash equivalents	0
Fresh-start adjustment, increase (decrease), accounts receivable, net	0
Fresh-start adjustment, increase (decrease), inventories	70,100,000
Fresh-start adjustment, increase (decrease), assets from coal trading activities, net	0
Fresh-start adjustment, increase (decrease), other current assets	(333,000,000)
Fresh-start adjustment, increase (decrease), total current assets	(262,900,000)
Fresh-start adjustment, increase (decrease), property, plant, equipment and mine development, net	(3,461,400,000)
Fresh-start adjustment, increase (decrease), Investments	238,000,000
Fresh-start adjustment, increase (decrease), total assets	(3,486,300,000)
Fresh-Start Adjustment, Increase (Decrease), Liabilities [Abstract]
Fresh-start adjustment, increase (decrease), current portion of long-term debt	0
Fresh-start adjustment, increase (decrease), liabilities from coal trading activities, net	0
Fresh-start adjustment, increase (decrease), accounts payable and accrued expenses	14,800,000
Fresh-start adjustment, increase (decrease), total current liabilities	14,800,000
Fresh-start adjustment, increase (decrease), long-term debt, less current portion	0
Fresh-start adjustment, increase (decrease), deferred income taxes	(177,800,000)
Fresh-start adjustment, increase (decrease), asset retirement obligations	(73,900,000)
Fresh-start adjustment, increase (decrease), accrued postretirement benefit costs	(6,900,000)
Fresh-start adjustment, increase (decrease), other noncurrent liabilities	120,600,000
Fresh-start adjustment, increase (decrease), total liabilities not subject to compromise	(123,200,000)
Fresh-start adjustment, increase (decrease), liabilities subject to compromise	0
Fresh-start adjustment, increase (decrease), total liabilities	(123,200,000)
Fresh-Start Adjustment, Increase (Decrease), Stockholders' Equity [Abstract]
Net impact on accumulated deficit	(3,850,200,000)
Fresh-start adjustment, increase (decrease), accumulated other comprehensive loss	448,500,000
Fresh-start adjustment, increase (decrease), Peabody Energy Corporation stockholders' equity	(3,401,700,000)
Fresh-start adjustment, increase (decrease), noncontrolling interests	38,600,000
Fresh-start adjustment, increase (decrease), total stockholders' equity	(3,363,100,000)
Fresh-start adjustment, increase (decrease), liabilities and stockholders' equity	(3,486,300,000)
Predecessor
Preconfirmation, Current Assets [Abstract]
Preconfirmation, cash and cash equivalents	1,068,100,000
Preconfirmation, accounts receivable, net	312,100,000
Preconfirmation, inventories	250,800,000
Preconfirmation, assets from coal trading activities, net	600,000
Preconfirmation, other current assets	493,900,000
Preconfirmation, total current assets	3,206,200,000
Preconfirmation, property, plant, equipment and mine development, net	8,653,900,000
Preconfirmation, investments and orher assets	976,400,000
Preconfirmation, total assets	12,836,500,000
Preconfirmation, Current Liabilities [Abstract]
Preconfirmation, current portion of long-term debt	18,200,000
Preconfirmation, liabilities from coal trading activities, net	700,000
Preconfirmation, accounts payable and accrued expenses	967,300,000
Preconfirmation, total current liabilities	986,200,000
Preconfirmation, long-term debt, less current portion	950,500,000
Preconfirmation, deferred income taxes	179,200,000
Preconfirmation, asset retirement obligations	707,000,000
Preconfirmation, accrued postretirement benefit costs	753,900,000
Preconfirmation, other noncurrent liabilities	511,100,000
Preconfirmation, total liabilities not subject to compromise	4,087,900,000
Preconfirmation, liabilities subject to compromise	8,416,700,000
Preconfirmation, total liabilities	12,504,600,000
Preconfirmation, Stockholders' Equity [Abstract]
Preconfirmation, common stock	200,000
Preconfirmation, additional paid-in capital	2,423,900,000
Preconfirmation, treasury stock, at cost	(371,900,000)
Preconfirmation, accumulated deficit	(1,284,100,000)
Preconfirmation, accumulated other comprehensive loss	(448,500,000)
Preconfirmation, Peabody Energy Corporation stockholders' equity	319,600,000
Preconfirmation, noncontrolling interests	12,300,000
Preconfirmation, total stockholders' equity	331,900,000
Preconfirmation, total liabilities and stockholders' equity	12,836,500,000
Fresh-Start Adjustment, Increase (Decrease), Stockholders' Equity [Abstract]
Successor Common Stock	200,000
Successor Additional paid-in capital	2,423,900,000
Cancellation of Predecessor Treasury stock	(371,900,000)
Predecessor | Effect of Plan
Fresh-Start Adjustment, Increase (Decrease), Stockholders' Equity [Abstract]
Successor Common Stock	(200,000)
Successor Additional paid-in capital	(2,423,900,000)
Successor
Fresh-Start Adjustment, Increase (Decrease), Stockholders' Equity [Abstract]
Successor Common Stock	700,000
Successor Additional paid-in capital	1,774,900,000
Postconfirmation, Current Assets [Abstract]
Postconfirmation, cash and cash equivalents	1,053,700,000
Postconfirmation, accounts receivable, net	312,100,000
Postconfirmation, inventories	320,900,000
Postconfirmation, assets from coal trading activities	600,000
Postconfirmation, other current assets	142,800,000
Postconfirmation, total current assets	1,856,100,000
Postconfirmation, property, plant, equipment and mine development, net	5,192,500,000
Postconfirmation, investments and orher assets	1,218,300,000
Postconfirmation, total assets	8,266,900,000
Postconfirmation, current portion of long-term debt	27,700,000
Postconfirmation, liabilities from coal trading activities, net	700,000
Postconfirmation, accounts payable and accrued expenses	1,239,700,000
Postconfirmation, total current liabilities	1,268,100,000
Postconfirmation, long-term debt, less current portion	1,853,700,000
Postconfirmation, deferred income taxes	1,400,000
Postconfirmation, asset retirement obligations	633,100,000
Postconfirmation, accrued postretirement benefit costs	747,000,000
Postconfirmation, other noncurrent liabilities	631,700,000
Postconfirmation, total liabilities not subject to compromise	5,135,000,000
Postconfirmation, liabilities subject to compromise	0
Postconfirmation, total liabilities	5,135,000,000
Postconfirmation, common stock	700,000
Postconfirmation, Series A preferred stock	1,305,400,000
Postconfirmation, additional paid-in capital	1,774,900,000
Postconfirmation, treasury stock, at cost	0
Postconfirmation, accumulated deficit	0
Postconfirmation, accumulated other comprehensive loss	0
Postconfirmation, noncontrolling interests	50,900,000
Postconfirmation, total stockholders' equity	3,131,900,000
Postconfirmation, total liabilities and stockholders' equity	8,266,900,000
Successor | Effect of Plan
Fresh-Start Adjustment, Increase (Decrease), Stockholders' Equity [Abstract]
Successor Common Stock	700,000
Fresh-start adjustment, increase (decrease), Series A preferred stock	1,305,400,000
Successor Additional paid-in capital	1,774,900,000
Postconfirmation, Current Assets [Abstract]
Postconfirmation, Series A preferred stock	750,000,000
Postconfirmation, Peabody Energy Corporation stockholders' equity	3,081,000,000
Postconfirmation, total stockholders' equity	3,105,000,000
Successor | Fresh Start Adjustments
Fresh-Start Adjustment, Increase (Decrease), Stockholders' Equity [Abstract]
Successor Common Stock	0
Fresh-start adjustment, increase (decrease), Series A preferred stock	0
Successor Additional paid-in capital	0
Cancellation of Predecessor Treasury stock	0
Restricted Cash Other Than Proceeds from Successor Notes | Effect of Plan
Fresh-Start Adjustment, Increase (Decrease), Assets [Abstract]
Fresh-start adjustment, increase (decrease), restricted cash	(54,700,000)
Restricted Cash Other Than Proceeds from Successor Notes | Fresh Start Adjustments
Fresh-Start Adjustment, Increase (Decrease), Assets [Abstract]
Fresh-start adjustment, increase (decrease), restricted cash	0
Restricted Cash Other Than Proceeds from Successor Notes | Predecessor
Preconfirmation, Current Assets [Abstract]
Preconfirmation, restricted cash	80,700,000
Restricted Cash Other Than Proceeds from Successor Notes | Successor
Postconfirmation, Current Assets [Abstract]
Postconfirmation, restricted cash	26,000,000
Proceeds from Successor Notes | Effect of Plan
Fresh-Start Adjustment, Increase (Decrease), Assets [Abstract]
Fresh-start adjustment, increase (decrease), restricted cash	(1,000,000,000)
Proceeds from Successor Notes | Fresh Start Adjustments
Fresh-Start Adjustment, Increase (Decrease), Assets [Abstract]
Fresh-start adjustment, increase (decrease), restricted cash	0
Proceeds from Successor Notes | Predecessor
Preconfirmation, Current Assets [Abstract]
Preconfirmation, restricted cash	1,000,000,000
Proceeds from Successor Notes | Successor
Postconfirmation, Current Assets [Abstract]
Postconfirmation, restricted cash	0
Senior Notes | 7.875% Senior Notes due November 2026 | Effect of Plan
Fresh-Start Adjustment, Increase (Decrease), Liabilities [Abstract]
Fresh-start adjustment, increase (decrease), long-term debt, less current portion	(250,000,000)
Senior Notes | 10.00% Senior Secured Second Lien Notes due March 2022 | Effect of Plan
Fresh-Start Adjustment, Increase (Decrease), Liabilities [Abstract]
Fresh-start adjustment, increase (decrease), long-term debt, less current portion	(1,000,000,000)
Senior Notes | 6.50% Senior Notes due September 2020 | Effect of Plan
Fresh-Start Adjustment, Increase (Decrease), Liabilities [Abstract]
Fresh-start adjustment, increase (decrease), long-term debt, less current portion	(650,000,000)
Subordinated Debt | Convertible Junior Subordinated Debentures due December 2066 | Effect of Plan
Fresh-Start Adjustment, Increase (Decrease), Liabilities [Abstract]
Fresh-start adjustment, increase (decrease), long-term debt, less current portion	$ (732,500,000)

Emergence from the Chapter 1150

Emergence from the Chapter 11 Cases and Fresh Start Reporting - Gain on Settlement of Liabilities Subject to Compromise (Details) - USD ($) $ in Millions	Apr. 01, 2017	Sep. 30, 2017	Dec. 31, 2016
Fresh-Start Adjustment [Line Items]
Liabilities subject to compromise	$ 8,416.7		$ 8,440.2
Less amounts issued to settle claims:
Successor Series A Convertible Preferred Stock	(1,305.4)
Issuance of Successor Notes	(1,000)
Issuance of Successor Term Loan	(950)
Cash payments and accruals for claims and professional fees	(336.4)
Other:
Write-off of Predecessor debt issuance costs, see also (e) below	(18.1)
Total pre-tax gain on plan effects, see also (j) below	3,031.2
Successor
Fresh-Start Adjustment [Line Items]
Liabilities subject to compromise		$ 0
Less amounts issued to settle claims:
Successor Common Stock (at par)	(0.7)
Successor Additional paid-in capital	$ (1,774.9)

Emergence from the Chapter 1151

Emergence from the Chapter 11 Cases and Fresh Start Reporting - Sources and Uses of Cash Upon Emergence (Details) - USD ($) $ in Millions	Apr. 01, 2017	Sep. 30, 2017
Sources:
Private placement and rights offering	$ 1,500
Net proceeds from Senior Secured Term Loan	912.7
Escrowed interest from Successor Notes offering	8
Net impact on collateral requirements	11.6
Uses:
Payments to secured lenders	(3,489.2)
Professional fees	(8.3)	$ (250)
Securitization facility deferred financing costs	(3.9)
Total cash outflow at emergence	$ (1,069.1)

Emergence from the Chapter 1152

Emergence from the Chapter 11 Cases and Fresh Start Reporting - Liabilities Subject to Compromise (Details) - USD ($) $ in Millions		Apr. 01, 2017	Dec. 31, 2016
Fresh-Start Adjustment [Line Items]
Debt	[1]	$ 8,077.4	$ 8,080.3
Interest payable		172.6	172.6
Environmental liabilities		61.9	61.9
Trade payables		55.2	58.4
Postretirement benefit obligations	[2]	23	34.6
Other accrued liabilities		26.6	32.4
Liabilities subject to compromise		8,416.7	8,440.2
First Lien, Second Lien And Unsecured Debt
Fresh-Start Adjustment [Line Items]
Debt		7,768.3	7,771.2
Prepetition Letters Of Credit | Derivative Contract Termination
Fresh-Start Adjustment [Line Items]
Debt		$ 257.3
Prepetition Letters Of Credit | Secured Debt
Fresh-Start Adjustment [Line Items]
Debt			$ 51.8
[1]	Includes $7,768.3 million and $7,771.2 million of first lien, second lien and unsecured debt at April 1, 2017 and December 31, 2016, respectively, and $257.3 million of derivative contract terminations, and $51.8 million of liabilities secured by prepetition letters of credit at April 1, 2017 and December 31, 2016.
[2]	Includes liabilities for unfunded non-qualified pension plans, all the participants of which are former employees.

Emergence from the Chapter 1153

Emergence from the Chapter 11 Cases and Fresh Start Reporting - Impact of Reorganization Adjustments (Details) - USD ($) $ in Millions	Apr. 01, 2017	Apr. 01, 2017	Sep. 30, 2016	Sep. 30, 2016
Fresh-Start Adjustment [Line Items]
Total pre-tax gain on plan effects, see also (j) below	$ 3,031.2
Successor debt issuance costs and other items, see also (f) and (g) above	50.9	$ 50.9
Net impact on accumulated deficit	5,134.3	5,134.3
Predecessor
Fresh-Start Adjustment [Line Items]
Total pre-tax gain on plan effects, see also (j) below		3,031.2	$ 0	$ 0
Cancellation of Predecessor Common Stock	0.2	0.2
Cancellation of Predecessor Additional paid-in capital	2,423.9	2,423.9
Cancellation of Predecessor Treasury stock	$ (371.9)	$ (371.9)

Emergence from the Chapter 1154

Emergence from the Chapter 11 Cases and Fresh Start Reporting - Adjustments to PP&E (Details) - USD ($) $ in Millions	Sep. 30, 2017	Apr. 01, 2017	Dec. 31, 2016
Revaluation of Assets
Fresh-Start Adjustment [Line Items]
Fresh-start adjustment, increase (decrease), property, plant, equipment and mine development, net		$ (3,461.4)
Fresh-start adjustment, increase (decrease), accumulated depreciation, depletion and amortization		5,266.9
Predecessor
Fresh-Start Adjustment [Line Items]
Preconfirmation, property, plant, equipment and mine development, net		8,653.9
Preconfirmation, accumulated depreciation, depletion and amortization		(5,266.9)
Asset retirement obligations			$ 717.8
Successor
Fresh-Start Adjustment [Line Items]
Postconfirmation, property, plant, equipment and mine development, net		5,192.5
Postconfirmation, accumulated depreciation, depletion and amortization		0
Asset retirement obligations	$ 636
Land and coal interests | Revaluation of Assets
Fresh-Start Adjustment [Line Items]
Fresh-start adjustment, increase (decrease), property, plant, equipment and mine development, net		(6,511.8)
Land and coal interests | Predecessor
Fresh-Start Adjustment [Line Items]
Preconfirmation, property, plant, equipment and mine development, net		10,297.7
Land and coal interests | Successor
Fresh-Start Adjustment [Line Items]
Postconfirmation, property, plant, equipment and mine development, net		3,785.9
PP&E, fair value		3,504.7
Asset retirement obligations		281.2
Buildings and improvements | Revaluation of Assets
Fresh-Start Adjustment [Line Items]
Fresh-start adjustment, increase (decrease), property, plant, equipment and mine development, net		(1,013.2)
Buildings and improvements | Predecessor
Fresh-Start Adjustment [Line Items]
Preconfirmation, property, plant, equipment and mine development, net		1,479.3
Buildings and improvements | Successor
Fresh-Start Adjustment [Line Items]
Postconfirmation, property, plant, equipment and mine development, net		466.1
Machinery and equipment | Revaluation of Assets
Fresh-Start Adjustment [Line Items]
Fresh-start adjustment, increase (decrease), property, plant, equipment and mine development, net		(1,203.3)
Machinery and equipment | Predecessor
Fresh-Start Adjustment [Line Items]
Preconfirmation, property, plant, equipment and mine development, net		2,143.8
Machinery and equipment | Successor
Fresh-Start Adjustment [Line Items]
Postconfirmation, property, plant, equipment and mine development, net		$ 940.5

Emergence from the Chapter 1155

Emergence from the Chapter 11 Cases and Fresh Start Reporting - Reorganization Items, Net (Details) - USD ($) $ in Millions	Apr. 01, 2017	Apr. 01, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Fresh-Start Adjustment [Line Items]
Gain on settlement of claims (per above)	$ (3,031.2)
Professional fees	336.4
Payments of Reorganization Professional Fees	8.3			$ 250
Income Tax Effect Related to Predecessor Deferred Tax Liabilities
Fresh-Start Adjustment [Line Items]
Fresh start income tax adjustments, net	(177.8)
Income Tax Effect Related to AOCI
Fresh-Start Adjustment [Line Items]
Fresh start income tax adjustments, net	(81.5)
Income Tax Effect Related to Unrecognized Tax Benefits
Fresh-Start Adjustment [Line Items]
Fresh start income tax adjustments, net	(6.7)
Income Tax Effect Related to Predecessor Deferred Tax Assets of Discontinued Operations
Fresh-Start Adjustment [Line Items]
Fresh start income tax adjustments, net	$ 12.1
Predecessor
Fresh-Start Adjustment [Line Items]
Gain on settlement of claims (per above)		$ (3,031.2)	$ 0		$ 0
Fresh start adjustments, net (per above)		3,363.1	0		0
Fresh start income tax adjustments, net		(253.9)	0		0
Loss on termination of derivative contracts		0	0		75.2
Professional fees		42.5	31.1		52.7
Accounts payable settlement gains		(0.7)	(0.5)		(0.7)
Interest income		(0.4)	(0.9)		(1.1)
Other		0	0		(1)
Reorganization items, net		627.2	29.7		125.1
Cash paid for “Reorganization items, net”		$ 45.8	$ 30.7		$ 30.7

Asset Impairment (Details)

Asset Impairment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended	12 Months Ended
	Apr. 01, 2017	Sep. 30, 2016	Jun. 30, 2016	Sep. 30, 2016	Dec. 31, 2016
Asset Impairment
Asset impairment					$ 247.9
Predecessor
Asset Impairment
Asset impairment	$ 30.5	$ 0		$ 17.2
Terminated Coal Lease Contracts | Predecessor
Asset Impairment
Asset impairment	$ 30.5
Queensland, Australia | Predecessor
Asset Impairment
Write down of certain targeted divestiture assets			$ 17.2

Discontinued Operations - Asset

Discontinued Operations - Assets and Liabilities of Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2017	Apr. 01, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Liabilities:
Liabilities subject to compromise		$ 8,416.7				$ 8,440.2
Successor
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss from discontinued operations, net of income taxes	$ (3.7)			$ (6.4)
Liabilities:
Liabilities subject to compromise	0			0
Predecessor
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss from discontinued operations, net of income taxes		$ (16.2)	$ (38.1)		$ (44.5)
Liabilities:
Liabilities subject to compromise						8,440.2
Discontinued Operations, Held-for-sale or Disposed of by Sale | Successor
Assets:
Other current assets	0.2			0.2
Investments and other assets	0			0
Total assets classified as discontinued operations	0.2			0.2
Liabilities:
Accounts payable and accrued expenses	46.2			46.2
Other noncurrent liabilities	185.5			185.5
Liabilities subject to compromise	0			0
Total liabilities classified as discontinued operations	$ 231.7			$ 231.7
Discontinued Operations, Held-for-sale or Disposed of by Sale | Predecessor
Assets:
Other current assets						0.2
Investments and other assets						15.9
Total assets classified as discontinued operations						16.1
Liabilities:
Accounts payable and accrued expenses						55.9
Other noncurrent liabilities						198.5
Liabilities subject to compromise						20.9
Total liabilities classified as discontinued operations						$ 275.3

Discontinued Operations - Patri

Discontinued Operations - Patriot Related Matters (Details) - Spinoff - Patriot - USD ($) $ in Millions	Jan. 25, 2017	Sep. 30, 2016	Dec. 31, 2013	Dec. 31, 2015	Sep. 30, 2017	Dec. 31, 2007
Black Lung Occupational Disease Liability
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Potential exposure from Patriot bankruptcy						$ 150
Potential exposure from Patriot bankruptcy					$ 125.4
UMWA 1974 Pension Plan (UMWA Plan) Litigation
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Settlement of claim, amount awarded to other party	$ 75
Litigation settlement, liability	$ 54.3				$ 44.3
Funding of VEBA Pursuant to Settlement with UMWA and Patriot Coal Corporation
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Funding of the newly established VEBA			$ 310
Number of years of payments to fund VEBA			4 years
Payments made to fund VEBA				$ 165
Settlement agreement, amount		$ 75
Gain on VEBA settlement		$ 68.1

Inventories - Schedule of Inven

Inventories - Schedule of Inventory (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Successor
Inventories [Line Items]
Materials and supplies	$ 104
Raw coal	58
Saleable coal	145.7
Total	$ 307.7
Predecessor
Inventories [Line Items]
Materials and supplies		$ 104.5
Raw coal		29.6
Saleable coal		69.6
Total		$ 203.7

Inventories - Narrative (Detail

Inventories - Narrative (Details) $ in Millions	Dec. 31, 2016USD ($)
Reserve for materials and supplies
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation Allowances and Reserves, Balance	$ 5.6

Derivatives and Fair Value Me61

Derivatives and Fair Value Measurements - Narrative (Details) - Foreign currency forward contract AUD in Millions	Jun. 30, 2018AUDAUD / $	Dec. 31, 2017AUD / $	Sep. 30, 2017AUD
Successor
Derivatives, Fair Value [Line Items]
Derivative, notional amount			AUD 450
Scenario, Forecast
Derivatives, Fair Value [Line Items]
Derivative, notional amount	AUD 675
Derivative, Exchange Rate Cap | AUD / $	0.85	0.78

Derivatives and Fair Value Me62

Derivatives and Fair Value Measurements - Gains and Losses on Hedging Derivatives (Details) - Designated as Hedging Instrument - USD ($) $ in Millions		3 Months Ended				6 Months Ended	9 Months Ended
		Sep. 30, 2017	Apr. 01, 2017	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2017	Sep. 30, 2016
Predecessor
Derivative Instruments, Gain (Loss) [Line Items]
Total loss recognized in income			$ (27.6)	$ (47.4)			$ (272.9)
Loss reclassified from other comprehensive loss into income			(27.6)	(47.4)			(188.5)	[1]
(Loss) gain realized in income on derivatives			0	0			(84.4)
Unrealized gain (loss) recognized in income on non- designated derivatives			0	0			0
Predecessor | Fuel contracts
Derivative Instruments, Gain (Loss) [Line Items]
Loss reclassified from other comprehensive loss into income					$ 9
Predecessor | Commodity swap contracts | Operating costs and expenses
Derivative Instruments, Gain (Loss) [Line Items]
Total loss recognized in income			(11)	(19.4)			(78.3)
Loss reclassified from other comprehensive loss into income			(11)	(19.4)			(66.4)	[1]
(Loss) gain realized in income on derivatives			0	0			(11.9)
Unrealized gain (loss) recognized in income on non- designated derivatives			0	0			0
Predecessor | Commodity swap contracts | Reorganization items, net
Derivative Instruments, Gain (Loss) [Line Items]
Total loss recognized in income							(38.8)
Loss reclassified from other comprehensive loss into income	[1]						0
(Loss) gain realized in income on derivatives							(38.8)
Unrealized gain (loss) recognized in income on non- designated derivatives							0
Predecessor | Foreign currency cash flow hedge contracts
Derivative Instruments, Gain (Loss) [Line Items]
Loss reclassified from other comprehensive loss into income					$ 13.6
Predecessor | Foreign currency cash flow hedge contracts | Operating costs and expenses
Derivative Instruments, Gain (Loss) [Line Items]
Total loss recognized in income			(16.6)	(28)			(119.4)
Loss reclassified from other comprehensive loss into income			(16.6)	(28)			(122.1)	[1]
(Loss) gain realized in income on derivatives			0	0			2.7
Unrealized gain (loss) recognized in income on non- designated derivatives			$ 0	$ 0			0
Predecessor | Foreign currency cash flow hedge contracts | Reorganization items, net
Derivative Instruments, Gain (Loss) [Line Items]
Total loss recognized in income							(36.4)
Loss reclassified from other comprehensive loss into income	[1]						0
(Loss) gain realized in income on derivatives							(36.4)
Unrealized gain (loss) recognized in income on non- designated derivatives							$ 0
Successor
Derivative Instruments, Gain (Loss) [Line Items]
Total loss recognized in income		$ 5.6				$ 8.5
(Loss) gain realized in income on derivatives		7.3				7
Unrealized gain (loss) recognized in income on non- designated derivatives		(1.7)				1.5
Successor | Commodity swap contracts | Reorganization items, net
Derivative Instruments, Gain (Loss) [Line Items]
Total loss recognized in income		5.6
(Loss) gain realized in income on derivatives		7.3
Unrealized gain (loss) recognized in income on non- designated derivatives		$ (1.7)
Successor | Foreign currency cash flow hedge contracts | Operating costs and expenses
Derivative Instruments, Gain (Loss) [Line Items]
Total loss recognized in income						8.5
(Loss) gain realized in income on derivatives						7
Unrealized gain (loss) recognized in income on non- designated derivatives						$ 1.5
[1]	Includes the reclassification from “Accumulated other comprehensive income (loss)” into earnings of $13.6 million and $9.0 million of previously unrecognized losses on foreign currency and fuel contracts, respectively, monetized in the first quarter of 2016.

Derivatives and Fair Value Me63

Derivatives and Fair Value Measurements - Financial Instruments Measured on Recurring Basis (Details) - Successor - Fair Value, Measurements, Recurring $ in Millions	Sep. 30, 2017USD ($)
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	$ 8.6
Foreign currency cash flow hedge contracts
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	8.6
Level 1
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	0
Level 1 | Foreign currency cash flow hedge contracts
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	0
Level 2
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	8.6
Level 2 | Foreign currency cash flow hedge contracts
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	8.6
Level 3
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	0
Level 3 | Foreign currency cash flow hedge contracts
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	$ 0

Derivatives and Fair Value Me64

Derivatives and Fair Value Measurements - Long-term debt (Details) - Successor $ in Millions	Sep. 30, 2017USD ($)
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 1,659.1
Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 1,744.3

Coal Trading - Trading Revenues

Coal Trading - Trading Revenues and Offsetting (Details) - Coal Trading - USD ($)		3 Months Ended			6 Months Ended	9 Months Ended
		Sep. 30, 2017	Apr. 01, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Coal trading derivative instruments and balance sheet offsetting disclosures:
Net variation margin (held) posted		$ 31,900,000			$ 31,900,000		$ 57,400,000
Cash Flow Hedging
Coal trading derivative instruments and balance sheet offsetting disclosures:
Net variation margin (held) posted		0			0		0
Successor
Trading Revenues by Type of Instrument [Line Items]
Trading Gain (Loss)		19,400,000			24,600,000
Coal trading derivative instruments and balance sheet offsetting disclosures:
Assets from coal trading activities, gross amounts of recognized assets		127,100,000			127,100,000
Liabilities from coal trading activities, gross amounts of recognized liabilities		(157,500,000)			(157,500,000)
Assets and (liabilities) from coal trading activities, net amounts recognized before the application of variation margin		(30,400,000)			(30,400,000)
Gross amounts of coal trading liabilities offset against associated coal trading assets		(124,600,000)			(124,600,000)
Gross amounts of coal trading assets offset against associated coal trading liabilities		124,600,000			124,600,000
Net coal trading (liabilities) assets offset against associated assets (liabilities)		0			0
Variation margin held offset against assets from coal trading activities	[1]	0			0
Variation margin posted offset against liabilities from coal trading activities	[1]	31,900,000			31,900,000
Net variation margin (held) posted	[1]	31,900,000			31,900,000
Assets from coal trading activities, net		2,500,000			2,500,000
Liabilities from coal trading activities, net		(1,000,000)			(1,000,000)
Net assets (liabilities) from coal trading activities		1,500,000			1,500,000
Predecessor
Trading Revenues by Type of Instrument [Line Items]
Trading Gain (Loss)			$ 15,000,000	$ 2,700,000		$ 16,500,000
Coal trading derivative instruments and balance sheet offsetting disclosures:
Assets from coal trading activities, gross amounts of recognized assets							191,200,000
Liabilities from coal trading activities, gross amounts of recognized liabilities							(249,100,000)
Assets and (liabilities) from coal trading activities, net amounts recognized before the application of variation margin							(57,900,000)
Gross amounts of coal trading liabilities offset against associated coal trading assets							(190,500,000)
Gross amounts of coal trading assets offset against associated coal trading liabilities							190,500,000
Net coal trading (liabilities) assets offset against associated assets (liabilities)							0
Variation margin held offset against assets from coal trading activities	[1]						0
Variation margin posted offset against liabilities from coal trading activities	[1]						57,400,000
Net variation margin (held) posted	[1]						57,400,000
Assets from coal trading activities, net							700,000
Liabilities from coal trading activities, net							(1,200,000)
Net assets (liabilities) from coal trading activities							$ (500,000)
Futures, swaps and options | Successor
Trading Revenues by Type of Instrument [Line Items]
Trading Gain (Loss)		(17,100,000)			(24,400,000)
Futures, swaps and options | Predecessor
Trading Revenues by Type of Instrument [Line Items]
Trading Gain (Loss)			(10,200,000)	(19,600,000)		(42,700,000)
Physical purchase/sale contracts | Successor
Trading Revenues by Type of Instrument [Line Items]
Trading Gain (Loss)		$ 36,500,000			$ 49,000,000
Physical purchase/sale contracts | Predecessor
Trading Revenues by Type of Instrument [Line Items]
Trading Gain (Loss)			$ 25,200,000	$ 22,300,000		$ 59,200,000
[1]	None of the net variation margin posted at September 30, 2017 and December 31, 2016, respectively, related to cash flow hedges.

Coal Trading - Fair Value (Deta

Coal Trading - Fair Value (Details) - Coal Trading - USD ($) number in Millions, $ in Millions		3 Months Ended			6 Months Ended	9 Months Ended
		Sep. 30, 2017	Apr. 01, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2015
Coal Trading (Textuals) [Abstract]
Fair value hierarchy transfers from Level 1 to Level 2										$ 0		$ 0
Fair value hierarchy transfers from Level 2 to Level 1										$ 0		$ 0
Successor
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Gain (Loss)		$ 19.4			$ 24.6
Successor | Fair Value, Measurements, Recurring
Fair value coal trading net assets (liabilities) measured on recurring basis:
Futures, swaps and options		0.5			0.5
Physical purchase/sale contracts		1			1
Total net financial assets (liabilities)		1.5			1.5
Successor | Level 1 | Fair Value, Measurements, Recurring
Fair value coal trading net assets (liabilities) measured on recurring basis:
Futures, swaps and options		0			0
Physical purchase/sale contracts		0			0
Total net financial assets (liabilities)		0			0
Successor | Level 2 | Fair Value, Measurements, Recurring
Fair value coal trading net assets (liabilities) measured on recurring basis:
Futures, swaps and options		0.5			0.5
Physical purchase/sale contracts		1			1
Total net financial assets (liabilities)		1.5			1.5
Successor | Level 3
Changes in the Company's recurring Level 3 net financial assets
Beginning of period					(0.7)
Transfers into Level 3					0
Transfers out of Level 3					0.7
Included in earnings					0
Sales					0
End of period		0	$ (0.7)		0
Changes in unrealized gains (losses)	[1]				0
Successor | Level 3 | Fair Value, Measurements, Recurring
Fair value coal trading net assets (liabilities) measured on recurring basis:
Futures, swaps and options		0			0
Physical purchase/sale contracts		0			0
Total net financial assets (liabilities)		$ 0			0
Predecessor
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Gain (Loss)			15	$ 2.7		$ 16.5
Predecessor | Fair Value, Measurements, Recurring
Fair value coal trading net assets (liabilities) measured on recurring basis:
Futures, swaps and options											$ (0.1)
Physical purchase/sale contracts											(0.4)
Total net financial assets (liabilities)											(0.5)
Predecessor | Level 1 | Fair Value, Measurements, Recurring
Fair value coal trading net assets (liabilities) measured on recurring basis:
Futures, swaps and options											0
Physical purchase/sale contracts											0
Total net financial assets (liabilities)											0
Predecessor | Level 2 | Fair Value, Measurements, Recurring
Fair value coal trading net assets (liabilities) measured on recurring basis:
Futures, swaps and options											(0.1)
Physical purchase/sale contracts											0.7
Total net financial assets (liabilities)											0.6
Predecessor | Level 3
Changes in the Company's recurring Level 3 net financial assets
Beginning of period			(1.1)	(1.1)	$ (0.7)	(15.6)
Transfers into Level 3			0	4.6		5
Transfers out of Level 3			0.2	(11)		(0.4)
Included in earnings			0.2	2.6		1.2
Sales			0	0.1		0
Settlements			0	4.2		9.1
End of period			(0.7)	(0.7)		(0.7)
Changes in unrealized gains (losses)	[1]		$ 0.3	$ 0.1		$ (0.1)
Predecessor | Level 3 | Fair Value, Measurements, Recurring
Fair value coal trading net assets (liabilities) measured on recurring basis:
Futures, swaps and options											0
Physical purchase/sale contracts											(1.1)
Total net financial assets (liabilities)											$ (1.1)
Scenario, Forecast | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Future Realization of Trading Portfolio							0.00%	0.00%	0.00%
[1]	Within the unaudited condensed consolidated statements of operations and unaudited condensed consolidated statements of comprehensive income for the periods presented, unrealized gains and losses from Level 3 items are combined with unrealized gains and losses on positions classified in Level 1 or 2, as well as other positions that have been realized during the applicable periods.

Coal Trading - Narrative (Detai

Coal Trading - Narrative (Details)	3 Months Ended	9 Months Ended
	Jun. 30, 2017agency	Sep. 30, 2017USD ($)	Dec. 31, 2016USD ($)
Concentration Risk [Line Items]
Number of major credit rating agencies that adjusted corporate credit rating | agency	2
Coal Trading
Concentration Risk [Line Items]
Total asset (liabilities) from coal trading activities, net		$ 31,900,000	$ 57,400,000
Initial margin posted		14,600,000	16,200,000
Potential collateralization that may be requested by counterparties related to material adverse event		0	2,000,000
Collateral required to be posted to counterparties			1,000,000
Collateral posted to counterparties		$ 0	0
External Credit Rating, Investment Grade [Member] | Credit Concentration Risk [Member] | Coal Trading Positions [Member] | Coal Trading
Concentration Risk [Line Items]
Concentration Risk, Percentage		33.00%
Non Rated [Member] | Credit Concentration Risk [Member] | Coal Trading Positions [Member] | Coal Trading
Concentration Risk [Line Items]
Concentration Risk, Percentage		67.00%
Cash Flow Hedging | Coal Trading
Concentration Risk [Line Items]
Total asset (liabilities) from coal trading activities, net		$ 0	$ 0

Intangible Contract Assets an68

Intangible Contract Assets and Liabilities - Narrative (Details) - Fresh Start Reporting - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Apr. 03, 2017
Sales Contracts
Fresh-Start Adjustment [Line Items]
Intangible assets								$ 314.9
Liabilities								58.7
Intangible liabilities								$ 116.2
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Amortization of intangible assets and liabilities	$ 41.5	$ 71.2
Take-Or-Pay Contracts
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Amortization of intangible liabilities	$ 6.5	$ 16.4
Scenario, Forecast | Sales Contracts
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Amortization, remainder of 2017							$ 40
Amortization, 2018						$ 80
Amortization, 2019					$ 40
Amortization, 2020				$ 10
Amortization, 2021			$ 10
Scenario, Forecast | Take-Or-Pay Contracts
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Amortization of intangible liabilities, remainder of 2017							$ 6
Amortization of intangible liabilities, 2018						$ 30
Amortization of intangible liabilities, 2019					$ 20
Amortization of intangible liabilities, 2020				$ 10
Amortization of intangible liabilities, 2021			$ 5

Intangible Contract Assets an69

Intangible Contract Assets and Liabilities - Balances and Balance Sheet Classifications (Details) - Successor - Fresh Start Reporting $ in Millions	Sep. 30, 2017USD ($)
Fresh-Start Adjustment [Line Items]
Assets	$ 231.6
Liabilities	(155.3)
Net Total	76.3
Take-Or-Pay Contracts
Fresh-Start Adjustment [Line Items]
Assets	0
Coal supply agreements
Fresh-Start Adjustment [Line Items]
Assets	231.6
Net Total	184.7
Take-Or-Pay Contracts
Fresh-Start Adjustment [Line Items]
Liabilities	(108.4)
Coal supply agreements
Fresh-Start Adjustment [Line Items]
Liabilities	46.9
Investments and other assets
Fresh-Start Adjustment [Line Items]
Assets	231.6
Liabilities	0
Net Total	231.6
Accounts payable and accrued expenses
Fresh-Start Adjustment [Line Items]
Assets	0
Liabilities	(35.7)
Other noncurrent liabilities
Fresh-Start Adjustment [Line Items]
Assets	0
Liabilities	$ (119.6)

Equity Method Investments and70

Equity Method Investments and Financing Receivables (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2017	Apr. 01, 2017	Sep. 30, 2017	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Equity method investments and financing receivables	$ 75		$ 75	$ 75		$ 84.8
Middlemount Mine
Accounts, Notes, Loans and Financing Receivable [Line Items]
Equity method investment, ownership percentage	50.00%		50.00%	50.00%
Interest rate terms				15.00%
Financing Receivable | Middlemount Mine
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of days available cash not required to pay known bills				35 days
Available cash distribution to stockholders ratio				50.00%
Available cash distribution to company if no marketing royalty payment overdue	100.00%
Financing receivable, cash received from equity Interest		$ 31.1	$ 35.2		$ 13.2
Intercompany loans						$ 50
Intercompany Loans, Outstanding	$ 0		$ 0	$ 0
Australian Bank Bill Swap Reference Rate | Middlemount Mine
Accounts, Notes, Loans and Financing Receivable [Line Items]
Basis spread over Australian Bank Bill Swap Reference Rate	3.50%

Property, Plant, Equipment an71

Property, Plant, Equipment and Mine Development (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Successor
Property, Plant, Equipment and Mine Development, Net [Line Items]
Land and Coal Interests	$ 3,819.7
Buildings and Improvements, Gross	457.3
Property, plant, equipment and mine development, gross	1,077.4
Less: Accumulated depreciation, depletion and amortization	(271.8)
Total, net	$ 5,082.6
Predecessor
Property, Plant, Equipment and Mine Development, Net [Line Items]
Land and Coal Interests		$ 10,330.8
Buildings and Improvements, Gross		1,507.6
Property, plant, equipment and mine development, gross		2,130.2
Less: Accumulated depreciation, depletion and amortization		(5,191.9)
Total, net		$ 8,776.7

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	Apr. 01, 2017	Sep. 30, 2017	Apr. 01, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jan. 01, 2018
Successor
Income Taxes
Income tax provision (benefit)		$ (84.1)			$ (79.4)
Successor | Foreign Tax Authority
Income Taxes
Income tax provision (benefit)		$ 0.9			$ 1
Scenario, Forecast
Income Taxes
Gross net operating losses, retain estimate							$ 3,300
Predecessor
Income Taxes
Income tax provision (benefit)	$ (266)		$ (263.8)	$ (10.8)		$ (108.2)
Predecessor | Foreign Tax Authority
Income Taxes
Income tax provision (benefit)			$ 9.4	$ 5		$ 7.4

Long-term Debt - Schedule of De

Long-term Debt - Schedule of Debt (Details) - USD ($) $ in Millions		Sep. 30, 2017	Jun. 30, 2017	Apr. 01, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Capital lease and other obligations			$ 79.9
Less: Liabilities subject to compromise	[1]			$ 8,077.4	$ 8,080.3
Successor
Debt Instrument [Line Items]
Capital lease and other obligations		$ 84
Less: Debt issuance costs		(69.9)
Total debt		1,659.1
Less: Current portion of long-term debt		47.1
Less: Liabilities subject to compromise		0
Long-term debt		1,612
Successor | Senior Notes | 6.00% Senior Secured Notes due March 2022
Debt Instrument [Line Items]
Long-term debt		$ 500
Stated interest rate		6.00%	6.00%
Successor | Senior Notes | 6.00% Senior Secured Notes due March 2022
Debt Instrument [Line Items]
Long-term debt		$ 500
Stated interest rate		6.375%	6.375%
Successor | Senior Notes | 6.00% Senior Notes due November 2018
Debt Instrument [Line Items]
Long-term debt		$ 0
Stated interest rate			6.00%
Successor | Senior Notes | 6.50% Senior Notes due September 2020
Debt Instrument [Line Items]
Long-term debt		0
Stated interest rate			6.50%
Successor | Senior Notes | 6.25% Senior Notes due November 2021
Debt Instrument [Line Items]
Long-term debt		0
Stated interest rate			6.25%
Successor | Senior Notes | 10.00% Senior Secured Second Lien Notes due March 2022
Debt Instrument [Line Items]
Long-term debt		0
Stated interest rate			10.00%
Successor | Senior Notes | 7.875% Senior Notes due November 2026
Debt Instrument [Line Items]
Long-term debt		0
Stated interest rate			7.875%
Successor | Term Loan | Senior Secured Term Loan due 2022
Debt Instrument [Line Items]
Long-term debt		645
Successor | Term Loan | 2013 Term Loan Facility due September 2020
Debt Instrument [Line Items]
Long-term debt		0
Successor | Line of Credit | Revolving Credit Facility | 2013 Revolver
Debt Instrument [Line Items]
Long-term debt		0
Successor | Subordinated Debt | Convertible Junior Subordinated Debentures due December 2066
Debt Instrument [Line Items]
Long-term debt		$ 0
Predecessor
Debt Instrument [Line Items]
Capital lease and other obligations					20.1
Less: Debt issuance costs					(70.8)
Total debt					7,791.4
Less: Current portion of long-term debt					20.2
Less: Liabilities subject to compromise					7,771.2
Long-term debt					0
Predecessor | Senior Notes | 6.00% Senior Secured Notes due March 2022
Debt Instrument [Line Items]
Long-term debt					$ 0
Stated interest rate					6.00%
Predecessor | Senior Notes | 6.00% Senior Secured Notes due March 2022
Debt Instrument [Line Items]
Long-term debt					$ 0
Stated interest rate					6.375%
Predecessor | Senior Notes | 6.00% Senior Notes due November 2018
Debt Instrument [Line Items]
Long-term debt					$ 1,518.8
Stated interest rate					6.00%
Predecessor | Senior Notes | 6.50% Senior Notes due September 2020
Debt Instrument [Line Items]
Long-term debt					$ 650
Stated interest rate					6.50%
Predecessor | Senior Notes | 6.25% Senior Notes due November 2021
Debt Instrument [Line Items]
Long-term debt					$ 1,339.6
Stated interest rate					6.25%
Predecessor | Senior Notes | 10.00% Senior Secured Second Lien Notes due March 2022
Debt Instrument [Line Items]
Long-term debt					$ 979.4
Stated interest rate					10.00%
Predecessor | Senior Notes | 7.875% Senior Notes due November 2026
Debt Instrument [Line Items]
Long-term debt					$ 247.8
Stated interest rate					7.875%
Predecessor | Term Loan | Senior Secured Term Loan due 2022
Debt Instrument [Line Items]
Long-term debt					$ 0
Predecessor | Term Loan | 2013 Term Loan Facility due September 2020
Debt Instrument [Line Items]
Long-term debt					1,162.3
Predecessor | Line of Credit | Revolving Credit Facility | 2013 Revolver
Debt Instrument [Line Items]
Long-term debt					1,558.1
Predecessor | Subordinated Debt | Convertible Junior Subordinated Debentures due December 2066
Debt Instrument [Line Items]
Long-term debt					$ 386.1
[1]	Includes $7,768.3 million and $7,771.2 million of first lien, second lien and unsecured debt at April 1, 2017 and December 31, 2016, respectively, and $257.3 million of derivative contract terminations, and $51.8 million of liabilities secured by prepetition letters of credit at April 1, 2017 and December 31, 2016.

Long-term Debt - Narrative (Det

Long-term Debt - Narrative (Details) - USD ($)	Sep. 18, 2017	Sep. 15, 2017	Jul. 31, 2017	Sep. 30, 2017	Apr. 01, 2017	Sep. 30, 2017	Sep. 30, 2017	Jun. 30, 2017
Debt Instrument [Line Items]
Interest expense, adequate protection payments					$ 29,800,000
Contractual interest expense					$ 92,900,000
Capital lease obligations								$ 79,900,000
Term Loan | Successor Credit Agreement
Debt Instrument [Line Items]
Loss on early debt extinguishment				$ 11,000,000
Restricted payments threshold	$ 450,000,000			50,000,000		$ 50,000,000	$ 50,000,000	$ 450,000,000
Successor
Debt Instrument [Line Items]
Debt issuance cost				69,900,000		69,900,000	69,900,000
Interest expense				42,400,000		83,800,000
Loss on early debt extinguishment				(12,900,000)		(12,900,000)
Capital lease obligations				$ 84,000,000		$ 84,000,000	$ 84,000,000
Successor | Senior Notes | 6.00% Senior Secured Notes due March 2022
Debt Instrument [Line Items]
Stated interest rate				6.00%		6.00%	6.00%	6.00%
Long-term debt				$ 500,000,000		$ 500,000,000	$ 500,000,000
Successor | Senior Notes | 6.00% Senior Secured Notes due March 2022
Debt Instrument [Line Items]
Stated interest rate				6.375%		6.375%	6.375%	6.375%
Long-term debt				$ 500,000,000		$ 500,000,000	$ 500,000,000
Successor | Senior Notes | 6.00% And 6.375% Senior Secured Notes, Successor Notes
Debt Instrument [Line Items]
Debt issuance cost								$ 49,500,000
Interest expense				15,500,000		30,600,000
Successor | Term Loan | Successor Credit Agreement
Debt Instrument [Line Items]
Interest expense				13,800,000		26,900,000
Principal amount								650,000,000
Original issue discount and deferred finance costs		$ 1,900,000		6,100,000		6,100,000	6,100,000	37,300,000
Debt Instrument, Fee Amount				2,000,000		$ 2,000,000	$ 2,000,000
Debt instrument, term							5 years
Periodic payment				$ 1,600,000
Mandatory principal prepayment, percent of excess cash flow				75.00%		75.00%	75.00%
Mandatory principal prepayment, if required, period payable, threshold							100 days
Excess proceeds from sales of assets, threshold ($10 million or greater)				$ 10,000,000		$ 10,000,000	$ 10,000,000
Capital expenditure threshold 2017								220,000,000
Capital expenditure threshold 2018								220,000,000
Capital expenditure threshold 2019								250,000,000
Capital expenditure threshold 2020								250,000,000
Capital expenditure threshold 2021								$ 300,000,000
Payment for debt extinguishment or debt prepayment cost		$ 300,000,000	$ 150,000,000
Successor | Term Loan | Senior Secured Term Loan due 2022
Debt Instrument [Line Items]
Long-term debt				645,000,000		645,000,000	645,000,000
Secured Debt				$ 950		$ 950	$ 950
Debt Instrument, Redemption, Period One | Successor | Senior Notes | 6.00% Senior Secured Notes due March 2022
Debt Instrument [Line Items]
Redemption price, percentage							103.00%
Debt Instrument, Redemption, Period One | Successor | Senior Notes | 6.00% Senior Secured Notes due March 2022
Debt Instrument [Line Items]
Redemption price, percentage							104.80%
Debt Instrument, Redemption, Period Two | Successor | Senior Notes | 6.00% Senior Secured Notes due March 2022
Debt Instrument [Line Items]
Redemption price, percentage							101.50%
Debt Instrument, Redemption, Period Two | Successor | Senior Notes | 6.00% Senior Secured Notes due March 2022
Debt Instrument [Line Items]
Redemption price, percentage							103.20%
Debt Instrument, Redemption, Period Three | Successor | Senior Notes | 6.00% Senior Secured Notes due March 2022
Debt Instrument [Line Items]
Redemption price, percentage							101.60%
Geographic Distribution, Domestic | Successor | Senior Notes | 6.00% And 6.375% Senior Secured Notes, Successor Notes
Debt Instrument [Line Items]
Collateral, capital stock, percent				100.00%		100.00%	100.00%
Geographic Distribution, Foreign | Successor | Senior Notes | 6.00% And 6.375% Senior Secured Notes, Successor Notes
Debt Instrument [Line Items]
Collateral, non-voting capital stock, percent				100.00%		100.00%	100.00%
Collateral, voting capital stock, percent				65.00%		65.00%	65.00%
Peabody Investments (Gibraltar) Limited | Successor | Senior Notes | 6.00% And 6.375% Senior Secured Notes, Successor Notes
Debt Instrument [Line Items]
Collateral, non-voting capital stock, percent				100.00%		100.00%	100.00%
Collateral, voting capital stock, percent				65.00%		65.00%	65.00%
London Interbank Offered Rate (LIBOR) | Successor | Term Loan | Successor Credit Agreement
Debt Instrument [Line Items]
Basis spread on variable rate	3.50%			4.50%		3.50%
Floor interest rate				1.00%		1.00%	1.00%
Total Leverage Ratio Less or Equal to 2.00 to 1.00 Greater Than 1.50 to 1.00 | Successor | Term Loan | Successor Credit Agreement
Debt Instrument [Line Items]
Mandatory principal prepayment, percent of excess cash flow				50.00%		50.00%	50.00%
Total Leverage Ratio Less or Equal to 2.00 to 1.00 Greater Than 1.50 to 1.00 | Successor | Maximum | Term Loan | Successor Credit Agreement
Debt Instrument [Line Items]
Total Leverage Ratio				2		2	2
Total Leverage Ratio Less or Equal to 2.00 to 1.00 Greater Than 1.50 to 1.00 | Successor | Minimum | Term Loan | Successor Credit Agreement
Debt Instrument [Line Items]
Total Leverage Ratio				1.50		1.50	1.50
Total Leverage Ratio Less or Equal to 1.50 to 1.00 Greater Than 1.00 to 1.00 | Successor | Term Loan | Successor Credit Agreement
Debt Instrument [Line Items]
Mandatory principal prepayment, percent of excess cash flow				25.00%		25.00%	25.00%
Total Leverage Ratio Less or Equal to 1.50 to 1.00 Greater Than 1.00 to 1.00 | Successor | Maximum | Term Loan | Successor Credit Agreement
Debt Instrument [Line Items]
Total Leverage Ratio				1.50		1.50	1.50
Total Leverage Ratio Less or Equal to 1.50 to 1.00 Greater Than 1.00 to 1.00 | Successor | Minimum | Term Loan | Successor Credit Agreement
Debt Instrument [Line Items]
Total Leverage Ratio				1		1	1
Total Leverage Ratio Less or Equal to 1.00 to 1.00 | Successor | Term Loan | Successor Credit Agreement
Debt Instrument [Line Items]
Mandatory principal prepayment, percent of excess cash flow				0.00%		0.00%	0.00%
Total Leverage Ratio				1		1	1
Total Leverage Ratio Less or Equal 1.25 to 1.00 | Term Loan | Successor Credit Agreement
Debt Instrument [Line Items]
Total Leverage Ratio				1.25		1.25	1.25
Dividend payment and stock purchase payment threshold				$ 25,000,000		$ 25,000,000	$ 25,000,000
Revolving Credit Facility | Successor | Line of Credit | 2017 Revolver [Member]
Debt Instrument [Line Items]
Long-term debt				$ 300,000,000		$ 300,000,000	$ 300,000,000

Pension and Postretirement Be75

Pension and Postretirement Benefit Costs (Details) $ in Millions	3 Months Ended				6 Months Ended	9 Months Ended
	Sep. 30, 2017USD ($)	Apr. 01, 2017USD ($)	Sep. 30, 2016USD ($)	Jun. 30, 2016USD ($)	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)	Apr. 02, 2017plan
Defined benefit pension plans
Components of net periodic benefit cost
Funding threshold	80.00%				80.00%
Number of non-qualified pension plans prior to reorganization | plan							2
Contributions by employer					$ 30.1
Defined Contribution Plan, Employer Discretionary Contribution Amount					25
Successor | Defined benefit pension plans
Components of net periodic benefit cost
Service cost for benefits earned	$ 0.5				1.1
Interest cost on projected or accumulated postretirement benefit obligation	9.4				18.7
Expected return on plan assets	(11.2)				(22.4)
Amortization of prior service cost and net actuarial loss	0				0
Net periodic pension or postretirement benefit (income) cost	(1.3)				(2.6)
Successor | Postretirement benefit plans
Components of net periodic benefit cost
Service cost for benefits earned	2.3				4.6
Interest cost on projected or accumulated postretirement benefit obligation	8.2				16.5
Amortization of prior service cost and net actuarial loss	0				0
Net periodic pension or postretirement benefit (income) cost	$ 10.5				$ 21.1
Predecessor | Defined benefit pension plans
Components of net periodic benefit cost
Service cost for benefits earned		$ 0.6	$ 0.7			$ 2
Interest cost on projected or accumulated postretirement benefit obligation		9.7	10.3			31
Expected return on plan assets		(11)	(11.3)			(33.9)
Amortization of prior service cost and net actuarial loss		6.4	6.3			18.8
Net periodic pension or postretirement benefit (income) cost		5.7	$ 6			17.9
Predecessor | Postretirement benefit plans
Components of net periodic benefit cost
Service cost for benefits earned		2.3		$ 2.6		7.8
Interest cost on projected or accumulated postretirement benefit obligation		8.4		8.8		26.4
Amortization of prior service cost and net actuarial loss		3.2		2.4		7.1
Net periodic pension or postretirement benefit (income) cost		$ 13.9		$ 13.8		$ 41.3

Accumulated Other Comprehensi76

Accumulated Other Comprehensive Income (Loss) - AOCI (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2017	Apr. 01, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Predecessor
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax		$ (18.6)	$ (29.9)		$ (119)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance		181.5		$ 0
Reclassification from other comprehensive income to earnings		23
Current period change		5.5
Fresh start reporting adjustment		448.5
Ending Balance		0
Predecessor | Foreign Currency Translation Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance		(148.2)		0
Reclassification from other comprehensive income to earnings		0
Current period change		5.5
Fresh start reporting adjustment		142.7
Ending Balance		0
Predecessor | Net Actuarial Loss Associated with Postretirement Plans and Workers’ Compensation Obligations
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance		(256.3)		0
Reclassification from other comprehensive income to earnings		5.8
Current period change		0
Fresh start reporting adjustment		250.5
Ending Balance		0
Predecessor | Prior Service Cost Associated with Postretirement Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance		21.7		0
Reclassification from other comprehensive income to earnings		(1.4)
Current period change		0
Fresh start reporting adjustment		(20.3)
Ending Balance		0
Predecessor | Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance		(94.2)		0
Reclassification from other comprehensive income to earnings		18.6
Current period change		0
Fresh start reporting adjustment		75.6
Ending Balance		0
Predecessor | Total Accumulated Other Comprehensive Income (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance		(477)		0
Ending Balance		$ 0
Successor
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	$ 0			0
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Current period change				1.8
Ending Balance	3,390.6			3,390.6
Successor | Foreign Currency Translation Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Current period change				1.8
Ending Balance	1.8			1.8
Successor | Net Actuarial Loss Associated with Postretirement Plans and Workers’ Compensation Obligations
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Current period change				0
Ending Balance	0			0
Successor | Prior Service Cost Associated with Postretirement Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Current period change				0
Ending Balance	0			0
Successor | Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Current period change				0
Ending Balance	0			0
Successor | Total Accumulated Other Comprehensive Income (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Ending Balance	$ 1.8			$ 1.8

Accumulated Other Comprehensi77

Accumulated Other Comprehensive Income (Loss) - Reclassification from AOCI (Details) - USD ($) $ in Millions		Apr. 01, 2017	Sep. 30, 2017	Apr. 01, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Predecessor
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Operating costs and expenses				$ (963.7)	$ (1,064.8)		$ (2,981.2)
Selling and administrative expenses				(37.2)	(32.1)		(114.6)
Income tax benefit (provision)		$ 266		263.8	10.8		108.2
Total after income taxes				(195.5)	(97.7)		(488.6)
Successor
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Operating costs and expenses			$ (1,044.9)			$ (1,979.7)
Selling and administrative expenses			(33.4)			(67.8)
Income tax benefit (provision)			84.1			79.4
Total after income taxes			$ 233.7			$ 335.1
Reclassification out of Accumulated Other Comprehensive Income | Predecessor | Net actuarial loss associated with postretirement plans and workers' compensation obligations
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Insignificant items	[1]			2.7	3		8.8
Total before income taxes	[1]			(9.1)	(8.4)		(25.1)
Income tax benefit (provision)	[1]			3.3	3.1		9.3
Total after income taxes	[1]			(5.8)	(5.3)		(15.8)
Reclassification out of Accumulated Other Comprehensive Income | Predecessor | Prior service credit associated with postretirement plans
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Total before income taxes	[1]			2.2	2.7		8
Income tax benefit (provision)	[1]			(0.8)	(1)		(3)
Total after income taxes	[1]			1.4	1.7		5
Reclassification out of Accumulated Other Comprehensive Income | Predecessor | Cash flow hedges
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Total before income taxes	[1]			(27.7)	(47.5)		(188.9)
Income tax benefit (provision)	[1]			9.1	17.6		69.9
Total after income taxes	[1]			(18.6)	(29.9)		(119)
Reclassification out of Accumulated Other Comprehensive Income | Foreign currency cash flow hedge contracts | Predecessor | Cash flow hedges
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Operating costs and expenses	[1]			(16.6)	(28)		(122.1)
Reclassification out of Accumulated Other Comprehensive Income | Fuel and explosives commodity swaps | Predecessor | Cash flow hedges
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Operating costs and expenses	[1]			(11)	(19.4)		(66.4)
Reclassification out of Accumulated Other Comprehensive Income | Insignificant items | Predecessor | Cash flow hedges
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Insignificant items	[1]			(0.1)	(0.1)		(0.4)
Postretirement health care and life insurance benefits | Reclassification out of Accumulated Other Comprehensive Income | Predecessor | Net actuarial loss associated with postretirement plans and workers' compensation obligations
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Operating costs and expenses	[1]			(5.5)	(5.2)		(15.4)
Postretirement health care and life insurance benefits | Reclassification out of Accumulated Other Comprehensive Income | Predecessor | Prior service credit associated with postretirement plans
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Operating costs and expenses	[1]			2.3	2.8		8.3
Defined benefit pension plans | Reclassification out of Accumulated Other Comprehensive Income | Predecessor | Net actuarial loss associated with postretirement plans and workers' compensation obligations
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Operating costs and expenses	[1]			(5.3)	(5.1)		(15.3)
Selling and administrative expenses	[1]			(1)	(1.1)		(3.2)
Defined benefit pension plans | Reclassification out of Accumulated Other Comprehensive Income | Predecessor | Prior service credit associated with postretirement plans
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Operating costs and expenses	[1]			$ (0.1)	$ (0.1)		$ (0.3)
[1]	Presented as gains (losses) in the unaudited condensed consolidated statements of operations.

Other Events (Details)

Other Events (Details) - USD ($) shares in Millions, $ in Millions

Aug. 23, 2017

Oct. 30, 2017

Sep. 30, 2017

Sep. 30, 2017

Apr. 01, 2017

Mar. 31, 2017

Sep. 30, 2017

Sep. 30, 2016

Sep. 05, 2017

Aug. 29, 2017

Aug. 01, 2017

Dec. 31, 2016

Nov. 30, 2016

Jun. 30, 2016

Other Commercial Events [Line Items]

Amount available for repurchase of shares under share repurchase program

$ 500

DTA and PBGC

Other Commercial Events [Line Items]

Equity method investment, ownership percentage

37.50%

Proceeds from disposal of assets, net of notes receivable

$ 20.5

Net gain on disposal of assets

$ 19.7

Metropolitan Collieries Pty Ltd

Other Commercial Events [Line Items]

Planned divestiture, agreed upon proceeds from divestiture

$ 200

Lenton Joint Venture [Member] | Burton Mine [Member]

Other Commercial Events [Line Items]

Planned divestiture, agreed upon proceeds from divestiture

$ 11

Increase (Decrease) in Asset Retirement Obligations

$ 53

Increase (Decrease) in Restricted Cash

30

BHP Billiton Mitsui Coal Pty Ltd [Member] | Red Mountain Joint Venture [Member]

Other Commercial Events [Line Items]

Planned divestiture, agreed upon proceeds from divestiture

$ 20

Ownership Percentage In Subsidiaries

50.00%

Bowie Resource Partners, LLC | New Mexico and Colorado Assets

Other Commercial Events [Line Items]

Planned divestiture, agreed upon proceeds from divestiture

$ 358

Termination fee

$ 20

Wabash Valley Power Association [Member] | Prarie State Energy Campus [Member]

Other Commercial Events [Line Items]

Proceeds from disposal of assets, net of notes receivable

$ 57.1

Net gain on disposal of assets

6.2

Undivided Interest Percent Of New Electricity Generation Project

5.10%

Pembroke Resources [Member] | NonstrategicAustralianminingtenement [Member]

Other Commercial Events [Line Items]

Proceeds from disposal of assets, net of notes receivable

64.1

Net gain on disposal of assets

$ 2.8

Subsequent Event

Other Commercial Events [Line Items]

Treasury Stock, Shares, Acquired

1.3

Common stock repurchases

$ 37.7

Successor

Other Commercial Events [Line Items]

Proceeds from disposal of assets, net of notes receivable

5.2

Net gain on disposal of assets

$ 0.4

0.9

Increase (Decrease) in Asset Retirement Obligations

$ 7.6

Treasury Stock, Shares, Acquired

1.5

1

2.5

Common stock repurchases

$ 40

$ 29.2

Earnings per Share (EPS) (Detai

Earnings per Share (EPS) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		Aug. 23, 2017	Sep. 30, 2017	Sep. 30, 2017	Apr. 01, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Line Items]
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share					$ (0.88)
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted				$ 0.6			$ 0.4
Basic EPS attributable to common stockholders:
Weighted Average Number of Shares Outstanding, Diluted				34.2			36.7
Successor
Earnings Per Share [Line Items]
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share				$ (0.02)			$ (0.05)
Participating Securities, Distributed and Undistributed Earnings (Loss), Basic				$ 51.6			$ 50.6
Antidilutive shares excluded from EPS calculation (less than 0.1 million for the period April 2 through June 30, 2017)				0.1			0.1
Weighted Average Number Diluted Shares Outstanding Adjustment				1.5			1
EPS numerator:
Income (loss) from continuing operations, net of income taxes				$ 233.7			$ 335.1
Less: Series A Convertible Preferred Stock dividends				23.5			138.6
Less: Net income attributable to noncontrolling interests				5.1			8.9
Participating Securities, Distributed and Undistributed Earnings (Loss), Basic				51.6			50.6
Income (loss) from continuing operations attributable to common stockholders, after allocation of earnings to participating securities (1)	[1]			153.5			137
Loss from discontinued operations attributable to common stockholders, after allocation of earnings to participating securities				(3.7)			(6.4)
Loss from discontinued operations allocated to participating securities				(0.9)			(1.7)
Net Income (Loss) from Discontinued Operations Available to Common Shareholders, Basic				(2.8)			(4.7)
Income (Loss) from Continuing Operations Attributable to Common Stockholders, Before Allocation of Earnings to Participating Securities				$ 205.1			$ 187.6
Earnings Per Share, Diluted				$ 1.47			$ 1.32
Weighted average shares outstanding — basic				101.6			99.2
Net income (loss) attributable to common stockholders, after allocation of earnings to participating securities (1)	[1]			$ 150.7			$ 132.3
EPS denominator:
Weighted average shares outstanding — basic and diluted (in shares)	[2]			103.1			100.2
Basic EPS attributable to common stockholders:
Loss from continuing operations (in dollars per share)				$ 1.51			$ 1.38
Loss from discontinued operations (in dollars per share)				(0.03)			(0.05)
Net loss attributable to common stockholders (in dollars per share)				1.48			1.33
Diluted income (loss) per share (in dollars per share)				$ 1.49			$ 1.37
Income (Loss) from Continuing Operations Attributable to Common Stockholders, Before Allocation of Earnings to Participating Securities				$ 205.1			$ 187.6
Treasury Stock, Shares, Acquired		1.5	1				2.5
Predecessor
Earnings Per Share [Line Items]
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share						$ (2.09)		$ (2.43)
Participating Securities, Distributed and Undistributed Earnings (Loss), Basic					$ 0	$ 0		$ 0
Antidilutive shares excluded from EPS calculation (less than 0.1 million for the period April 2 through June 30, 2017)					0.2	0.4
Weighted Average Number Diluted Shares Outstanding Adjustment					0	0		0
EPS numerator:
Income (loss) from continuing operations, net of income taxes					$ (195.5)	$ (97.7)		$ (488.6)
Less: Series A Convertible Preferred Stock dividends					0	0		0
Less: Net income attributable to noncontrolling interests					4.8	1.8		3.5
Participating Securities, Distributed and Undistributed Earnings (Loss), Basic					0	0		0
Income (loss) from continuing operations attributable to common stockholders, after allocation of earnings to participating securities (1)	[1]				(200.3)	(99.5)		(492.1)
Loss from discontinued operations attributable to common stockholders, after allocation of earnings to participating securities					(16.2)	(38.1)		(44.5)
Loss from discontinued operations allocated to participating securities					0	0		0
Net Income (Loss) from Discontinued Operations Available to Common Shareholders, Basic					(16.2)	(38.1)		(44.5)
Income (Loss) from Continuing Operations Attributable to Common Stockholders, Before Allocation of Earnings to Participating Securities					$ (200.3)	$ (99.5)		$ (492.1)
Earnings Per Share, Diluted					$ (11.81)	$ (7.53)		$ (29.34)
Weighted average shares outstanding — basic					18.3	18.3		18.3
Net income (loss) attributable to common stockholders, after allocation of earnings to participating securities (1)	[1]				$ (216.5)	$ (137.6)		$ (536.6)
EPS denominator:
Weighted average shares outstanding — basic and diluted (in shares)	[2]				18.3	18.3		18.3
Basic EPS attributable to common stockholders:
Loss from continuing operations (in dollars per share)					$ (10.93)	$ (5.44)		$ (26.91)
Loss from discontinued operations (in dollars per share)					(0.88)	(2.09)		(2.43)
Net loss attributable to common stockholders (in dollars per share)					(11.81)	(7.53)		(29.34)
Diluted income (loss) per share (in dollars per share)					$ (10.93)	$ (5.44)		$ (26.91)
Income (Loss) from Continuing Operations Attributable to Common Stockholders, Before Allocation of Earnings to Participating Securities					$ (200.3)	$ (99.5)		$ (492.1)
Preferred Stock
Basic EPS attributable to common stockholders:
Conversion of stock, shares converted							14.2
Warrant
Basic EPS attributable to common stockholders:
Warrants unexercised, percent (less than 0.1%)			0.00%	0.00%			0.00%
Common Stock
Basic EPS attributable to common stockholders:
Conversion of stock, shares issued							34.2
[1]	The reallocation adjustment for participating securities to arrive at the numerator to calculate diluted EPS was $0.6 million for the Successor three months ended September 30, 2017 and $0.4 million for the Successor period April 2 through September 30, 2017.
[2]	The two-class method assumes that participating securities are not exercised or converted. As such, weighted average diluted shares outstanding excluded 34.2 million shares and 36.7 million shares related to the participating securities for the Successor three months ended September 30, 2017 and the Successor period April 2 through September 30, 2017, respectively.

Financial Instruments and Oth80

Financial Instruments and Other Guarantees (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended
	Apr. 01, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Apr. 03, 2017	Dec. 31, 2016
Obligations [Member]
Guarantee Obligations [Line Items]
Restricted cash			$ 530.3			$ 529.3
U.S Mining
Guarantee Obligations [Line Items]
Asset retirement obligations			377
Australian Mining
Guarantee Obligations [Line Items]
Asset retirement obligations			259
Reclamation Bonding Surety Bond | U.S Mining | Surety Bond
Guarantee Obligations [Line Items]
Long-term debt			1,147.7
Secured Debt | Accounts Receivable Securitization Program, April 3, 2020
Guarantee Obligations [Line Items]
Long-term debt			0
Maximum borrowing capacity					$ 250
Letters of credit outstanding, amount			179.5
Cash collateral required			0
Interest expense	$ 2	$ 2.4	3.9	$ 5.6
Secured Debt | Former Securitization Facility
Guarantee Obligations [Line Items]
Cash collateral required						40.5
Obligations [Member]
Guarantee Obligations [Line Items]
Restricted cash			$ 7.8			$ 13.8

Commitments and Contingencies -

Commitments and Contingencies - Commitments (Details) $ in Millions	Sep. 30, 2017USD ($)
Capital Addition Purchase Commitments
Long-term Purchase Commitment [Line Items]
Purchase commitments for capital expenditures	$ 56.3

Commitments and Contingencies82

Commitments and Contingencies - Contingencies (Details) AUD in Millions, $ in Millions	Nov. 17, 2016USD ($)	Oct. 13, 2016USD ($)	Oct. 11, 2016USD ($)	Aug. 19, 2016USD ($)	Sep. 30, 2017AUDdefendantsite	Sep. 30, 2017USD ($)	Mar. 16, 2017USD ($)	Dec. 31, 2016USD ($)
Monto Coal Pty Limited
Loss Contingency [Abstract]
Ownership Percentage In Subsidiaries						51.00%
Number of defendants | defendant					3
Gold Fields
Loss Contingency [Abstract]
Number of national priority list sites based on the Superfund Amendments and Reauthorization Act of 1986 at which Gold Fields or the former affiliate, has been named a potentially responsible party (PRP) | site					4
Undiscounted environmental clean-up liabilities, total								$ 62.8
Minimum | Monto Coal Pty Limited
Loss Contingency [Abstract]
Damages sought, value | AUD					AUD 15.6
Maximum | Monto Coal Pty Limited
Loss Contingency [Abstract]
Damages sought, value | AUD					AUD 1,800
Berenergy Corporation vs. the Company | Berenergy
Loss Contingency [Abstract]
Litigation settlement damages awarded to plaintiff		$ 0.9
Loss contingency accrual						$ 13.1
Bankruptcy unliquidated, general unsecured claim | Blue Tee
Loss Contingency [Abstract]
Bankruptcy claims, amount of claims filed				$ 65.6
Bankruptcy additional unliquidated, in an unknown amount | Blue Tee
Loss Contingency [Abstract]
Bankruptcy claims, amount of claims filed				150
Bankruptcy further contingent claims, at known and unknown sites | Blue Tee
Loss Contingency [Abstract]
Bankruptcy claims, amount of claims filed				$ 500
Bankruptcy unliquidated, secured and general unsecured | Gold Fields
Loss Contingency [Abstract]
Bankruptcy claims, amount of claims filed	$ 1,200		$ 2,700
Debtors vs. Blue Tee
Loss Contingency [Abstract]
Bankruptcy claims, amount of federal tax refunds to be foregone to settle claims							$ 11
Bankruptcy claims, amount of insurance settlement proceeds to be transferred to settle claims							12
Bankruptcy claims, amount to be paid directly to settle claims							$ 20

Segment Information (Details)

Segment Information (Details) - USD ($) $ in Millions		Apr. 01, 2017	Sep. 30, 2017	Apr. 01, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations, Net of Income Taxes [Abstract]
Asset impairment								$ 247.9
DTA and PBGC
Reportable segment results
Net gain on disposal of assets				$ 19.7
Successor
Reportable segment results
Revenues			$ 1,477.2			$ 2,735.5
Total Adjusted EBITDA			411.3			729.1
Gain on VEBA settlement						0
Net gain on disposal of assets			0.4			0.9
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations, Net of Income Taxes [Abstract]
Income (loss) from continuing operations, net of income taxes			233.7			335.1
Depreciation, depletion and amortization			194.5			342.8
Asset retirement obligation expenses			11.3			22.3
Selling and administrative expenses related to debt restructuring			0			0
Asset impairment			0			0
Change in deferred tax asset valuation allowance related to equity affiliates			(3.4)			(7.7)
Interest expense			42.4			83.8
Loss on Extinguishment of Debt			12.9			12.9
Interest income			(2)			(3.5)
Break fees related to terminated asset sales			0			(28)
Unrealized losses (gains) on non-coal trading derivative contracts			1.7			(1.5)
Unrealized losses (gains) on economic hedges			10.8			1.4
Coal inventory revaluation			0			67.3
Take-or-pay contract-based intangible recognition			(6.5)			(16.4)
Reorganization items, net			0			0
Income tax provision (benefit)			(84.1)			(79.4)
Total Adjusted EBITDA			411.3			729.1
Predecessor
Reportable segment results
Revenues				1,326.2	$ 1,207.1		$ 3,274.5
Total Adjusted EBITDA				341.3	130.2		238
Gain on VEBA settlement				0			68.1
Net gain on disposal of assets				22.8	1.9		17.4
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations, Net of Income Taxes [Abstract]
Income (loss) from continuing operations, net of income taxes				(195.5)	(97.7)		(488.6)
Depreciation, depletion and amortization				119.9	117.8		345.5
Asset retirement obligation expenses				14.6	12.7		37.3
Selling and administrative expenses related to debt restructuring				0	0		21.5
Asset impairment				30.5	0		17.2
Change in deferred tax asset valuation allowance related to equity affiliates				(5.2)	(0.6)		(0.6)
Interest expense				32.9	58.5		243.7
Loss on Extinguishment of Debt				0	0		0
Interest income				(2.7)	(1.3)		(4)
Break fees related to terminated asset sales				0	0		0
Unrealized losses (gains) on non-coal trading derivative contracts				0	0		0
Unrealized losses (gains) on economic hedges				(16.6)	21.9		49.1
Coal inventory revaluation				0	0		0
Take-or-pay contract-based intangible recognition				0	0		0
Reorganization items, net				627.2	29.7		125.1
Income tax provision (benefit)		$ (266)		(263.8)	(10.8)		(108.2)
Total Adjusted EBITDA				341.3	130.2		238
Operating Segments | Successor | Powder River Basin Mining
Reportable segment results
Revenues			420.9			786.3
Total Adjusted EBITDA			112.7			197.5
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations, Net of Income Taxes [Abstract]
Total Adjusted EBITDA			112.7			197.5
Operating Segments | Successor | Midwestern U.S. Mining
Reportable segment results
Revenues			207.7			402.6
Total Adjusted EBITDA			49.5			96
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations, Net of Income Taxes [Abstract]
Total Adjusted EBITDA			49.5			96
Operating Segments | Successor | Western U.S. Mining
Reportable segment results
Revenues			155.7			281.1
Total Adjusted EBITDA			34.5			79.4
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations, Net of Income Taxes [Abstract]
Total Adjusted EBITDA			34.5			79.4
Operating Segments | Successor | Australian Metallurgical Mining
Reportable segment results
Revenues			415.9			703.7
Total Adjusted EBITDA			143.1			215
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations, Net of Income Taxes [Abstract]
Total Adjusted EBITDA			143.1			215
Operating Segments | Successor | Australian Thermal Mining
Reportable segment results
Revenues			265.8			505
Total Adjusted EBITDA			97.8			203.7
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations, Net of Income Taxes [Abstract]
Total Adjusted EBITDA			97.8			203.7
Operating Segments | Predecessor | Powder River Basin Mining
Reportable segment results
Revenues				394.3	419.6		1,062.2
Total Adjusted EBITDA				91.7	123.9		278.3
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations, Net of Income Taxes [Abstract]
Total Adjusted EBITDA				91.7	123.9		278.3
Operating Segments | Predecessor | Midwestern U.S. Mining
Reportable segment results
Revenues				193.2	211		599.6
Total Adjusted EBITDA				50	59.1		172.4
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations, Net of Income Taxes [Abstract]
Total Adjusted EBITDA				50	59.1		172.4
Operating Segments | Predecessor | Western U.S. Mining
Reportable segment results
Revenues				149.7	162.4		387
Total Adjusted EBITDA				50	34.3		83.2
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations, Net of Income Taxes [Abstract]
Total Adjusted EBITDA				50	34.3		83.2
Operating Segments | Predecessor | Australian Metallurgical Mining
Reportable segment results
Revenues				328.9	232.5		682.8
Total Adjusted EBITDA				109.6	(34.5)		(121)
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations, Net of Income Taxes [Abstract]
Total Adjusted EBITDA				109.6	(34.5)		(121)
Operating Segments | Predecessor | Australian Thermal Mining
Reportable segment results
Revenues				224.8	197.9		561.4
Total Adjusted EBITDA				75.6	48.9		137.2
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations, Net of Income Taxes [Abstract]
Total Adjusted EBITDA				75.6	48.9		137.2
Corporate, Non-Segment | Successor | Trading and Brokerage
Reportable segment results
Revenues			19.4			24.6
Total Adjusted EBITDA			2.7			(2.4)
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations, Net of Income Taxes [Abstract]
Total Adjusted EBITDA			2.7			(2.4)
Corporate, Non-Segment | Successor | Corporate and Other
Reportable segment results
Revenues			(8.2)			32.2
Total Adjusted EBITDA	[1]		(29)			(60.1)
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations, Net of Income Taxes [Abstract]
Total Adjusted EBITDA	[1]		$ (29)			$ (60.1)
Corporate, Non-Segment | Predecessor | Trading and Brokerage
Reportable segment results
Revenues				15	2.7		16.5
Total Adjusted EBITDA				8.8	(9.4)		(41.3)
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations, Net of Income Taxes [Abstract]
Total Adjusted EBITDA				8.8	(9.4)		(41.3)
Corporate, Non-Segment | Predecessor | Corporate and Other
Reportable segment results
Revenues				20.3	(19)		(35)
Total Adjusted EBITDA	[1]			(44.4)	(92.1)		(270.8)
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations, Net of Income Taxes [Abstract]
Total Adjusted EBITDA	[1]			$ (44.4)	$ (92.1)		(270.8)
Funding of VEBA Pursuant to Settlement with UMWA and Patriot Coal Corporation | Spinoff | Patriot
Reportable segment results
Gain on VEBA settlement							$ 68.1
[1]	Includes a gain of $19.7 million related to the sale of Dominion Terminal Associates during the predecessor period January 1 through April 1, 2017 and a gain of $68.1 million related to the 2016 Settlement Agreement described in Note 5. “Discontinued Operations” during the predecessor nine months ended September 30, 2016.

Segment Information - Assets by

Segment Information - Assets by Segment (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2017	Apr. 01, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Successor
Segment Reporting Information [Line Items]
Loss on early debt extinguishment	$ (12.9)			$ (12.9)
Assets	8,073.4			8,073.4
Property, plant, equipment and mine development, net	$ 5,082.6			$ 5,082.6
Predecessor
Segment Reporting Information [Line Items]
Loss on early debt extinguishment		$ 0	$ 0		$ 0
Assets						$ 11,777.7
Property, plant, equipment and mine development, net						$ 8,776.7