Peabody Energy (BTU) 10-Q 3 Nov 16 2016 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information Document	9 Months Ended
	Sep. 30, 2016shares
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, 2016
Amendment Flag	false
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding	18,500,000

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues
Sales	$ 1,076.8	$ 1,277.4	$ 2,861.9	$ 3,922.9
Other revenues	130.3	141.5	412.6	373.2
Total revenues	1,207.1	1,418.9	3,274.5	4,296.1
Costs and expenses
Operating costs and expenses (exclusive of items shown separately below)	1,064.8	1,254	2,981.2	3,774.4
Depreciation, depletion and amortization	117.8	136	345.5	430.6
Asset retirement obligation expenses	12.7	12.3	37.3	40.4
Selling and administrative expenses	32.1	37.8	114.6	128.8
Restructuring charges	0.3	1.8	15.5	23
Other operating (income) loss:
Net gain on disposal of assets	(1.9)	(7.9)	(17.4)	(20.2)
Asset impairment	0	0	17.2	900.8
Loss from equity affiliates	2.9	5.3	12.6	12.3
Operating loss	(21.6)	(20.4)	(232)	(994)
Interest expense	58.5	118.5	243.7	344
Loss on early debt extinguishment	0	0	0	67.8
Interest income	(1.3)	(1.4)	(4)	(6.6)
Reorganization Items, net	29.7	0	125.1	0
Loss from continuing operations before income taxes	(108.5)	(137.5)	(596.8)	(1,399.2)
Income tax (benefit) provision	(12.9)	6.9	(108.7)	(83.2)
Loss from continuing operations, net of income taxes	(95.6)	(144.4)	(488.1)	(1,316)
Loss from discontinued operations, net of income taxes	38.1	157.5	44.5	202.7
Net loss	(133.7)	(301.9)	(532.6)	(1,518.7)
Less: Net income attributable to noncontrolling interests	1.8	2.8	3.5	7.9
Net loss attributable to common stockholders	$ (135.5)	$ (304.7)	$ (536.1)	$ (1,526.6)
Loss from continuing operations:
Basic loss per share	$ (5.32)	$ (8.08)	$ (26.88)	$ (73.05)
Diluted loss per share	(5.32)	(8.08)	(26.88)	(73.05)
Net loss attributable to common stockholders:
Basic loss per share	(7.41)	(16.73)	(29.31)	(84.23)
Diluted loss per share	(7.41)	(16.73)	(29.31)	(84.23)
Dividends declared per share	$ 0	$ 0	$ 0	$ 0.0750

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents	$ 1,167.8	$ 261.3
Restricted Cash and Investments, Current	24.2	0
Accounts receivable, net of allowance for doubtful accounts of $14.2 at September 30, 2016 and $6.6 at December 31, 2015	351.9	228.8
Inventories	259.6	307.8
Assets from coal trading activities, net	19.9	23.5
Deferred income taxes	53.5	53.5
Other current assets	368.9	447.6
Total current assets	2,245.8	1,322.5
Property, Plant and Equipment, Net	9,215.5	9,258.5
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	2.3	2.2
Investments and other assets	771.6	363.7
Total assets	12,235.2	10,946.9
Current liabilities
Current portion of long-term debt	493.1	5,874.9
Liabilities from coal trading activities, net	19.5	15.6
Accounts payable and accrued expenses	835.9	1,446.3
Total current liabilities	1,348.5	7,336.8
Long-term debt, less current portion	0	366.3
Deferred income taxes	107.6	69.1
Asset retirement obligations	703.4	686.6
Accrued postretirement benefit costs	715.4	722.9
Other noncurrent liabilities	504.8	846.7
Total liabilities not subject to compromise	3,379.7	10,028.4
Liabilities subject to compromise	8,331.6	0
Total liabilities	11,711.3	10,028.4
Stockholders' equity
Additional paid-in capital	2,418.5	2,410.7
Treasury stock, at cost — 0.8 shares as of September 30, 2016 and December 31, 2015	(371.8)	(371.7)
Accumulated deficit	(1,039.5)	(503.4)
Accumulated other comprehensive loss	(486.7)	(618.9)
Peabody Energy Corporation stockholders' equity	520.7	916.9
Noncontrolling interests	3.2	1.6
Total stockholders' equity	523.9	918.5
Total liabilities and stockholders' equity	12,235.2	10,946.9
Preferred Stock [Member]
Stockholders' equity
Preferred Stock	0	0
Perpetual Preferred Stock [Member]
Stockholders' equity
Preferred Stock	0	0
Series Common Stock [Member]
Stockholders' equity
Common Stock	0	0
Common Stock [Member]
Stockholders' equity
Common Stock	$ 0.2	$ 0.2

Condensed Consolidated Balance4

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Millions, $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Current assets
Allowance for doubtful accounts	$ 14.2	$ 6.6
Stockholders' equity
Treasury Stock, shares	0.8	0.8
Preferred Stock [Member]
Stockholders' equity
Preferred Stock, par value per share	$ 0.01	$ 0.01
Preferred Stock, shares authorized	10	10
Preferred Stock, shares issued	0	0
Preferred Stock, shares outstanding	0	0
Perpetual Preferred Stock [Member]
Stockholders' equity
Preferred Stock, shares authorized	0.8	0.8
Preferred Stock, shares issued	0	0
Preferred Stock, shares outstanding	0	0
Series Common Stock [Member]
Stockholders' equity
Common Stock, par value per share	$ 0.01	$ 0.01
Common Stock, shares authorized	40	40
Common Stock, shares issued	0	0
Common Stock, shares outstanding	0	0
Common Stock [Member]
Stockholders' equity
Common Stock, par value per share	$ 0.01	$ 0.01
Common Stock, shares authorized	53.3	53.3
Common Stock, shares issued	19.3	19.3
Common Stock, shares outstanding	18.5	18.5

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash Flows From Operating Activities
Net loss	$ (532.6)	$ (1,518.7)
Loss from discontinued operations, net of income taxes	44.5	202.7
Loss from continuing operations, net of income taxes	(488.1)	(1,316)
Adjustments to reconcile loss from continuing operations, net of income taxes to net cash used in operating activities:
Depreciation, depletion and amortization	345.5	430.6
Noncash interest expense	30	22.9
Deferred income taxes	(38.9)	(53.7)
Noncash share-based compensation	8.9	20
Asset impairment	17.2	900.8
Net gain on disposal of assets	(17.4)	(20.2)
Loss from equity affiliates	12.6	12.3
Gain on VEBA settlement	(68.1)	0
Settlement of hedge positions	(25)	0
Reclassification from OCI for terminated hedge contracts	82	(14.9)
Noncash reorganization items, net	96.5	0
Changes in current assets and liabilities:
Accounts receivable	24.4	190
Change in receivable from accounts receivable securitization program	(168.5)	(5)
Inventories	47.8	55.2
Net assets from coal trading activities	7.5	(17.4)
Other current assets	(28.6)	7.6
Accounts payable and accrued expenses	5.2	(322)
Restricted cash	(94.8)	0
Asset retirement obligations	19	28.1
Accrued postretirement benefit costs	(0.6)	14.2
Accrued pension costs	16.4	21.1
Take-or-pay obligation settlement	(15.5)	0
Other, net	(25.4)	(15.6)
Net Cash (Used in) Provided by Operating Activities, Continuing Operations	(257.9)	(62)
Net cash used in discontinued operations	(18.9)	(28.6)
Net Cash (Used in) Provided by Operating Activities	(276.8)	(90.6)
Cash Flows From Investing Activities
Additions to property, plant, equipment and mine development	(56.6)	(76.9)
Changes in accrued expenses related to capital expenditures	(5.5)	(14.5)
Increase (Decrease) in Due from Related Parties	13.2	0
Federal coal lease expenditures	(249)	(89.8)
Proceeds from disposal of assets, net of notes receivable	134.7	39.6
Purchases of debt and equity securities	0	(22.6)
Proceeds from sales and maturities of debt and equity securities	0	33.6
Contributions to joint ventures	(241.7)	(349.8)
Distributions from joint ventures	236.7	339.8
Increase (Decrease) in Due to Related Parties	(23.3)	(3.6)
Other, net	(8.2)	(2.1)
Net cash (used in) provided by investing activities	(199.7)	(146.3)
Cash Flows From Financing Activities
Proceeds from long-term debt	1,429.8	975.7
Repayments of long-term debt	(11.2)	(666)
Payment of deferred financing costs	(29.8)	(28.7)
Dividends paid	0	(1.4)
Distributions to noncontrolling interests	(3.9)	(2.1)
Other, net	(1.9)	(4.3)
Net cash provided by financing activities	1,383	273.2
Net change in cash and cash equivalents	906.5	36.3
Cash and cash equivalents at beginning of period	261.3	298
Cash and cash equivalents at end of period	$ 1,167.8	$ 334.3

Consolidated Statement of Chang

Consolidated Statement of Changes in Stockholders' Equity (Unaudited) - 9 months ended Sep. 30, 2016 - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Accumulated Deficit	Accumulated Other Comprehensive Loss	Noncontrolling Interests
Beginning Balance at Dec. 31, 2015	$ 918.5	$ 0.2	$ 2,410.7	$ (371.7)	$ (503.4)	$ (618.9)	$ 1.6
Net Income (Loss) Attributable to Parent	(536.1)	0	0	0	(536.1)	0	3.5
Net loss	(532.6)
Net realized losses on cash flow hedges (net of $69.9 net tax provision)	119	0	0	0	0	119	0
Postretirement plans and workers’ compensation obligations (net of $6.3 net tax provision)	10.8	0	0	0	0	10.8	0
Foreign currency translation adjustment	2.4	0	0	0	0	2.4	0
Share-based compensation for equity-classified awards	7.8	0	7.8	0	0	0	0
Repurchase of employee common stock relinquished for tax withholding	(0.1)	0	0	(0.1)	0	0	0
Distributions to noncontrolling interests	(1.9)	0	0	0	0	0	(1.9)
Ending Balance at Sep. 30, 2016	$ 523.9	$ 0.2	$ 2,418.5	$ (371.8)	$ (1,039.5)	$ (486.7)	$ 3.2

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Other Comprehensive Income (Loss), Reclassification and Amortization, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) and Net Prior Service Cost Recognized, Net of Tax		$ 3.6	$ 10.8	$ 10.8	$ 26.8
Net loss		(133.7)	(301.9)	(532.6)	(1,518.7)
Other comprehensive income, net of income taxes
Net change in unrealized gains on available-for-sale securities (net of respective net tax provision (benefit) of $0.0, $0.0, $0.0 and ($0.1))		0	0.2	0	0.2
Net unrealized gains on cash flow hedges (net of respective net tax provision of $23.1, $81.0, $52.3 and $79.8)
Decrease in fair value of cash flow hedges		0	(115.6)	0	(100.4)
Reclassification for realized losses included in net loss	[1]	29.9	68.9	119	183.9
Net unrealized gains (losses) on cash flow hedges		29.9	(46.7)	119	83.5
Foreign currency translation adjustment		1.5	(15.3)	2.4	(41.5)
Other comprehensive income (loss), net of income taxes		35	(51)	132.2	69
Comprehensive loss		(98.7)	(352.9)	(400.4)	(1,449.7)
Less: Comprehensive income attributable to noncontrolling interests		1.8	2.8	3.5	7.9
Comprehensive loss attributable to common stockholders		$ (100.5)	$ (355.7)	$ (403.9)	$ (1,457.6)
[1]	Presented as gains (losses) in the unaudited condensed consolidated statements of operations.

Consolidated Statement of Chan8

Consolidated Statement of Changes in Stockholders' Equity (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net change in unrealized gains on available-for-sale securities, net tax benefit	$ 0	$ 0	$ 0	$ (0.1)
Net unrealized gains on cash flow hedges, net tax provision	17.6	(30.1)	69.9	49.8
Postretirement plans and workers' compensation obligations, net tax provision	$ 2.1	$ 1.8	$ 6.3	$ 11.2

Unaudited Condensed Consolidate

Unaudited Condensed Consolidated Statements of Comprehensive Income (Parentheticals) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net change in unrealized gains on available-for-sale securities, net tax provision (benefit)	$ 0	$ 0	$ 0	$ (0.1)
Net unrealized gains on cash flow hedges, net tax provision	17.6	(30.1)	69.9	49.8
Postretirement plans and workers' compensation obligations, net tax provision	$ 2.1	$ 1.8	$ 6.3	$ 11.2

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2016
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 and its affiliates (the Company or Peabody). Interests in subsidiaries controlled by the Company are consolidated with any outside shareholder 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. As discussed below in Note 2. "Newly Adopted Accounting Standards and Accounting Standards Not Yet Implemented," prior year amounts of deferred financing costs have been reclassified to conform with the new standard. 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, 2015 . In the opinion of management, these financial statements reflect all normal, recurring adjustments necessary for a fair presentation. Balance sheet information presented herein as of December 31, 2015 has been derived from the Company’s audited consolidated balance sheet at that date. The Company's results of operations for the three and nine months ended September 30, 2016 are not necessarily indicative of the results that may be expected for future quarters or for the year ending December 31, 2016 . Pursuant to the authorization provided at a special meeting of the Company's stockholders held on September 16, 2015, the Company completed a 1-for-15 reverse stock split of the shares of the Company’s common stock on September 30, 2015 (the Reverse Stock Split). As a result of the Reverse Stock Split, every 15 shares of issued and outstanding common stock were combined into one issued and outstanding share of Common Stock, without any change in the par value per share. No fractional shares were issued as a result of the Reverse Stock Split and any fractional shares that would otherwise have resulted from the Reverse Stock Split were paid in cash. The Reverse Stock Split reduced the number of shares of common stock outstanding from approximately 278 million shares to approximately 19 million shares. The number of authorized shares of common stock was also decreased from 800 million shares to 53.3 million shares. The Company's common stock began trading on a reverse stock split-adjusted basis on the New York Stock Exchange (NYSE) on October 1, 2015. All share and per share data included in this report has been retroactively restated to reflect the Reverse Stock Split. Since the par value of the common stock remained at $0.01 per share, the value for "Common stock" recorded to the Company's condensed consolidated balance sheets has been retroactively reduced to reflect the par value of restated outstanding shares, with a corresponding increase to "Additional paid-in capital." 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. Filing Under Chapter 11 of the United States Bankruptcy Code On April 13, 2016 (the Petition Date), Peabody and a majority of its wholly owned domestic subsidiaries as well as one international subsidiary in Gibraltar (the Filing Subsidiaries, and together with Peabody, the Debtors) filed voluntary petitions for reorganization (the petitions collectively, 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 Company’s Australian operations and other international subsidiaries are not included in the filings. The Debtors' Chapter 11 cases (collectively, the Chapter 11 Cases) are being jointly administered under the caption In re Peabody Energy Corporation, et al. , Case No. 16-42529 (Bankr. E.D. Mo.). The Debtors continue to operate their businesses as “debtors-in-possession” under the jurisdiction of the Bankruptcy Court and in accordance with the applicable provisions of the Bankruptcy Code and orders of the Bankruptcy Court. The filings of the Bankruptcy Petitions constituted an event of default under the Company’s prepretition credit agreement as well as the indentures governing certain of the Company’s debt instruments, as further described in Note 13. "Current and Long-term Debt" to the condensed consolidated financial statements, and all unpaid principal and accrued and unpaid interest due thereunder became immediately due and payable. Any efforts to enforce such payment obligations are automatically stayed as a result of the Bankruptcy Petitions and the creditors' rights of enforcement are subject to the applicable provisions of the Bankruptcy Code. Additionally, on the Petition Date, the NYSE determined that Peabody’s common stock was no longer suitable for listing pursuant to Section 8.02.01D of the NYSE’s Listed Company Manual, and trading in the Company’s common stock was suspended. The Company's common stock began trading on the OTC Pink Sheets marketplace under the symbol BTUUQ on April 14, 2016. Following the Petition Date, the NYSE formally de-listed the Company's common stock. On April 14, 2016, the Bankruptcy Court approved several motions (First Day Motions), including motions (i) authorizing the Debtors to pay prepetition wages and benefits for its workforce (Employee Motion), in part, (ii) prohibiting utilities from discontinuing service and authorizing the Debtors to provide adequate assurance deposits, (iii) authorizing the Debtors to pay prepetition obligations to certain critical vendors on an interim basis (Critical Vendor Motion), (iv) authorizing the Debtors to maintain their existing cash management system on an interim basis (Cash Management Motion), (v) authorizing certain Debtors to continue selling and contributing receivables and related rights pursuant to a securitization facility on an interim basis (Securitization Motion) and (vi) authorizing the Debtors to enter into an $800 million debtor-in-possession financing facility (DIP Credit Agreement) on an interim basis (DIP Motion). Pursuant to Section 362 of the Bankruptcy Code, the filing of the Bankruptcy Petitions automatically stayed most actions against the Debtors, including actions to collect indebtedness incurred prior to the Petition Date or to exercise control over the Debtors’ property. Subject to certain exceptions under the Bankruptcy Code, the filing of the Debtors’ Chapter 11 Cases also automatically stayed the continuation of most legal proceedings, including certain of the third party litigation matters described in Note 19. "Commitments and Contingencies" and Note 20. "Matters Related to the Bankruptcy of Patriot Coal Corporation" of this report 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, unless and until the Bankruptcy Court modifies or lifts the automatic stay as to any such claim. Notwithstanding the general application of the automatic stay described above, governmental authorities may determine to continue actions brought under their police and regulatory powers. The U.S. Trustee for the Eastern District of Missouri filed a notice appointing an official committee of unsecured creditors (the Creditors' Committee) on April 29, 2016. The Creditors’ Committee represents all unsecured creditors of the Debtors and has a right to be heard on all matters that come before the Bankruptcy Court. On May 17, 2016, the Bankruptcy Court approved various of the First Day Motions on a final basis, including the Employee Motion, Critical Vendor Motion, Cash Management Motion, Securitization Motion and DIP Motion. At the May 17 hearing, the Bankruptcy Court also approved various motions (i) authorizing the Debtors’ retention of various professionals, (ii) establishing procedures for the retention of ordinary course professionals, (iii) establishing procedures for the sale of de minimis assets and (iv) authorizing the Debtors to consummate the sale of the Debtors’ equity interests in Lively Grove Energy Partners, LLC, a Debtor, and dismissing Lively Grove Energy Partners, LLC’s current chapter 11 case. On May 20, 2016, the Debtors filed a complaint and request for declaratory judgment, as required by the terms of the DIP Credit Agreement, against Citibank, N.A. (in its capacity as Administrative Agent under the Debtors' prepetition secured credit agreement), among others, regarding the extent of certain collateral and secured claims of certain prepetition creditors (the CNTA Adversary Proceeding). On June 13, 2016, Citibank, N.A. filed an answer and counter-claim for declaratory judgment. On June 14, 2016, two motions to intervene were filed, one from the Creditors' Committee and another from a group of creditors holding $1.65 billion in face value of the Company's Senior Notes (as indicated in their motion). The intervention motions were granted on July 7, 2016. On June 15, 2016, the Bankruptcy Court approved several motions, including motions that (i) established deadlines for the filing of certain proofs of claim, approved the form and manner of notice thereof, and (ii) established a key employee retention program. At this hearing, the Bankruptcy Court also approved the Debtors' retention of various professionals, and the Creditors’ Committee's retention of various professionals. On July 5, 2016, the Debtors filed an answer to certain counterclaims in the CNTA Adversary Proceeding. On July 7, 2016, the Bankruptcy Court entered a stipulated order authorizing the Official Committee of Unsecured Creditors and certain noteholders to intervene in the CNTA Adversary Proceeding. On July 12, 2016, the Bankruptcy Court entered an order appointing the Honorable James L. Garrity, Jr. as mediator in the CNTA Adversary Proceeding. Defendant Citibank, N.A. moved for leave to amend its answer and counterclaim on August 18, 2016. On July 7, 2016, the defendants in the adversary proceeding captioned Peabody Coalsales, LLC v. Arizona Public Service Company and PacifiCorp (the " APS Adversary Proceeding ") filed a motion for dismissal of part of the Debtors' complaint. The Bankruptcy Court entered an order denying that motion the next day - on July 8, 2016. On July 22 and 29, 2016, the defendants in the APS Adversary Proceeding filed their answers to the Debtors' complaint. On August 3, 2016, a notice was filed indicating that the parties had agreed on a mediator in the APS Adversary Proceeding. In September 2016, the parties engaged in a court-ordered mediation. On November 2, 2016, the Bankruptcy Court entered an order scheduling the matter for trial beginning on February 13, 2017. On July 20, 2016, the Bankruptcy Court approved several motions, including motions that (i) granted certain entities limited relief from the automatic stay; (ii) established procedures governing the Creditors' Committee's obligation to provide information to unsecured creditors; (iii) authorized the retention of the Debtors' tax advisors; (iv) extended certain time periods, including the time period in which the Debtors' have the exclusive right to file a plan of reorganization; (v) authorized the rejection of certain executory contracts; and (vi) authorized the payment of certain secured and priority prepetition property taxes. On July 26, 2016, the Debtors filed motions to approve settlement agreements that the Debtors have reached with regulators in Wyoming, New Mexico and Indiana concerning the Debtors' reclamation bonding in those states (the Self-Bonding Stipulations). On August 3, 2016, the Debtors filed additional motions, including (i) a motion for approval of (a) a key employee incentive plan, (b) an executive leadership team short-term incentive plan and (c) modifications to the current director compensation program (collectively, the KEIP Motion); and (ii) a motion to extend (a) the period during which the Debtors have the exclusive right to file a plan of reorganization through and including November 9, 2016 and (b) the period during which the Debtors have the exclusive right to solicit acceptances thereof through and including January 9, 2017 (collectively, the Exclusivity Motion). On August 10, 2016, the Creditors' Committee filed a statement in support of the KEIP Motion. On July 29, 2016, the defendant in the adversary proceeding captioned Four Star Holdings, LLC v. Bowie Resource Holdings, LLC (Bowie) (the Four Star Adversary Proceeding) filed (i) a motion to dismiss part of the Debtors' complaint and (ii) its answer (with counterclaims) to the Debtors' complaint. On August 19, 2016, in the Four Star Adversary Proceeding the Debtors filed their reply and affirmative defenses to Defendant Bowie's counterclaims. On August 23, 2016, the Bankruptcy Court entered an order denying Bowie's previously-filed motion to dismiss a portion of the Debtors' complaint. On October 5, 2016, Bowie filed an amended answer to the Debtors' complaint, which included amended affirmative defenses and counterclaims. On October 19, 2016, the Debtors filed their reply and affirmative defenses to Defendant Bowie's amended counterclaims. On August 11, 2016, the Bankruptcy Court entered a stipulation and agreed order providing limited relief from the automatic stay to certain litigation claimants. Also on August 11, 2016, the Debtors filed their notice of reconciliation of reclamation claims. On August 18, 2016, the Bankruptcy Court entered orders in connection with several motions, including the Self-Bonding Stipulations, the KEIP Motion and the Exclusivity Motion. On August 19, 2016, certain of the Debtors filed amended schedules of assets and liabilities and schedules of financial affairs with the Bankruptcy Court. On August 18, 2016, in the CNTA Adversary Proceeding, Citibank, N.A. moved for leave to amend its answer and counterclaim. Additionally, on August 24, 2016, (i) the Debtors filed their motion for summary judgment and the Creditors' Committee and the ad hoc group of senior noteholders filed joinders thereto and (ii) Citibank, N.A. filed its motion for summary judgment. On September 12, 2016, the Bankruptcy Court heard oral argument on the Debtors' and Citibank, N.A.'s summary judgment motions in the CNTA Adversary Proceeding. On September 13, 2016, (i) the Bankruptcy Court entered an order granting Citibank, N.A.'s previously-filed motion to amend its answer and counterclaim, (ii) Citibank, N.A. filed its answer and amended counterclaim for declaratory relief and (iii) the Bankruptcy Court entered an order vacating the trial dates that had been previously scheduled in the CNTA Adversary Proceeding. On October 4, 2016, the Debtors filed their answer to Citibank, N.A.'s answer and amended counterclaim for declaratory relief. On October 7, 2016, two members of a group of creditors (the two members holding approximately $287.4 million in face value of the Company’s Senior Secured Second Lien Notes (as indicated in their motion)) moved to intervene in the CNTA Adversary Proceeding. On August 22, 2016, the Debtors filed a motion regarding a settlement agreement that the Debtors reached with regulators in Illinois concerning the Debtors' reclamation bonding in that state (the Illinois Self-Bonding Stipulation). On September 1, 2016, (i) the Debtors filed a motion to establish claims objection procedures (the Claims Objection Procedures Motion) and (ii) the Bankruptcy Court entered (a) a stipulation and consent order by and between the Debtors and certain environmental groups concerning pending litigation brought by the environmental groups and (b) an order confirming the Debtors' authority to share confidential agreements with their restructuring advisors. On September 15, 2016, the Bankruptcy Court granted several motions, including the Claims Objections Procedures Motion and the Illinois Self-Bonding Stipulation. The Bankruptcy Court entered orders approving these motions on September 15, 2016 and September 16, 2016, respectively. On September 16, 2016, the Debtors filed two omnibus objections to certain proofs of claim. On September 8, 2016, the Debtors filed an objection to a claim asserted by the United Mine Workers of America 1974 Pension Plan and Trust (UMWA Plan). On September 26, 2016, the UMWA Plan filed a motion for relief from the automatic stay, seeking to allow arbitration between the Debtors and the UMWA Plan to resume outside of the Bankruptcy Court's jurisdiction. On October 7, 2016, the UMWA Plan filed a motion to continue the hearing on the Debtors' objection to the UMWA Plan's proof of claim until January 2017. On September 30, 2016, numerous professionals retained by the Debtors and the Creditors’ Committee filed their first interim fee applications. On October 4, 2016, the Debtors filed several motions, including: (i) an application to retain additional professionals, (ii) a motion to reject certain contracts, (iii) a motion seeking authority for the Debtors to implement procedures by which the Debtors may, from time to time, amend and assume, or settle and buy-out, certain leases of personal property and equipment without need for further Bankruptcy Court approval (Equipment Lease Procedures Motion), and (iv) two motions related to the Debtors' insurance programs. On October 11, 2016, the Bankruptcy Court approved a stipulation and agreed order filed by the Debtors seeking the authority to enter into that certain Amendment No. 4 and Consent Under Superpriority Secured Debtor-in-Possession Credit Agreement (the DIP Amendment). The DIP Amendment modifies certain of the milestones under the DIP Credit Agreement, including (i) a modification to the deadline by which the Bankruptcy Court shall enter an order determining the issues being adjudicated in the CNTA Adversary Proceeding (the CNTA Order) to provide that the Bankruptcy Court shall have entered the CNTA Order by no later than November 23, 2016; (ii) a modification to the deadlines for the Company to file an Acceptable Reorganization Plan (as defined in the DIP Credit Agreement) and related disclosure statement to provide that the Company must file these by, or on, the date that is the later of (a) 30 days after the entry of the CNTA Order and (b) December 14, 2016; and (iii) a modification to the deadline by which the Bankruptcy Court shall enter an order approving the Debtors' disclosure statement to provide that the Bankruptcy Court shall have entered this order by no later than January 31, 2017. The DIP Credit Agreement also contains restrictions on the ability of Peabody Global Funding, LLC (Global Funding) to amend or waive provisions under the Intercompany Loan Agreement (as defined in the DIP Credit Agreement) in a manner that would release or subordinate more than 50% of the collateral thereunder. The DIP Amendment modifies these restrictions to expressly allow Global Funding to amend or waive provisions under the Intercompany Loan Agreement to permit the release or subordination of collateral thereunder, including as a result of potential asset sales, of up to $250 million in cash proceeds in the aggregate over the life of the Intercompany Loan Agreement. On October 14, 2016, the Debtors filed four omnibus objections to certain proofs of claim. On October 18, 2016, the Bankruptcy Court granted several motions, including (i) an application to retain additional professionals, (ii) a motion to reject a certain contract, (iii) the Equipment Lease Procedures Motion, and (iv) two motions related to the Debtors' insurance programs authorizing the Debtors to (a) enter into a new postpetition property policy with an affiliate(s) of American International Group, Inc. and (b) assume certain existing policies and enter into a new workers compensation insurance policy with ACE American Insurance Company, including its affiliated companies. Additionally, the Bankruptcy Court partially and conditionally granted the motion for relief from the automatic stay filed on September 26, 2016 by the UMWA Plan. The Bankruptcy Court lifted the automatic stay to provide the UMWA Plan until October 28, 2016, to receive a written confirmation from the American Arbitration Association (the AAA) that the AAA could find an arbitrator with sufficient experience who could arbitrate the UMWA Plan's claim and reach a decision, without extension or any exception for cause, by January 26, 2017. On October 21, 2016, Berenergy Corporation filed a motion to lift the automatic stay to allow it to appeal a final judgment entered in the Sixth Judicial District Court in the state of Wyoming, as discussed in more detail below in Note 19 "Commitments and Contingencies". On October 24, 2016, the Debtors filed a motion to assume or reject non-residential leases to which the Debtors are a party. On October 25, 2016, the UMWA Plan filed a copy of its correspondence with the AAA and on October 26, 2016, the Bankruptcy Court issued an order lifting the automatic stay to allow arbitration of the claim to proceed. The parties have selected an arbitrator, and the arbitration hearings are scheduled to begin on December 19, 2016. On October 26, 2016, the Debtors filed a motion to assume certain executory contracts to which certain Debtors are a party, as well as an omnibus motion for the rejection of certain executory contracts regarding overriding royalties. As a result of the Bankruptcy Petitions, the realization of the Debtors’ assets and the satisfaction of liabilities are subject to significant uncertainty. For the Debtors to emerge successfully from Chapter 11, they must obtain the Bankruptcy Court’s approval of a plan of reorganization, which will enable them to transition from Chapter 11 into ordinary course operations as reorganized entities outside of bankruptcy. A plan of reorganization determines the rights and treatment of claims of various creditors and equity security holders, and is subject to the ultimate outcome of negotiations and Bankruptcy Court decisions ongoing through the date on which the plan of reorganization is confirmed. The Debtors intend to propose a plan of reorganization on or prior to the applicable date required under the Bankruptcy Code and in accordance with milestones set forth in the DIP Credit Agreement (as set forth below in Note 13. "Current and Long-term Debt"), as the same may be extended with approval of the Bankruptcy Court. As noted above, the Debtors and the parties to the DIP Credit Agreement entered into the DIP Amendment, which modified certain milestone dates. The Debtors presently expect that any proposed plan of reorganization will provide, among other things, for mechanisms for the settlement of claims against the Debtors’ estates, treatment of the Debtors' existing equity and debt holders, and certain corporate governance and administrative matters pertaining to the reorganized Debtors. A proposed plan of reorganization filed with the Bankruptcy Court likely will incorporate provisions arising out of the Debtors' discussions with their creditors and other interested parties, and likely will be further revised thereafter. There can be no assurance that the Debtors will be able to secure approval for their proposed plan of reorganization from the Bankruptcy Court or execute such plan. Further, a plan of reorganization is likely to materially change the amounts and classifications of assets and liabilities reported in the Company’s condensed consolidated financial statements. Although it is uncertain at this stage if any proposed plan of reorganization would allow for distributions with respect to equity or other securities, it is likely that equity securities will be cancelled and extinguished upon confirmation of a proposed plan of reorganization by the Bankruptcy Court, and that the holders thereof would not be entitled to receive, and would not receive or retain, any property or interest in property on account of such equity interests. The Company believes it will require a significant restructuring of its balance sheet in order to continue as a going concern. The Company’s ability to continue as a going concern is dependent upon, among other things, its ability to become profitable and maintain profitability, its ability to access sufficient liquidity and its ability to successfully implement their Chapter 11 plan of reorganization. The accompanying condensed consolidated financial statements are prepared on a going concern basis and do not include any adjustments that might be required if the Company were unable to continue as a going concern.

Newly Adopted Accounting Standa

Newly Adopted Accounting Standards and Accounting Standards Not Yet Implemented	9 Months Ended
	Sep. 30, 2016
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 Going Concern. In August 2014, the Financial Accounting Standards Board (FASB) issued disclosure guidance that requires management to evaluate, at each annual and interim reporting period, whether substantial doubt exists about an entity's ability to continue as a going concern and, if applicable, to provide related disclosures. As outlined by that guidance, substantial doubt about an entity's ability to continue as a going concern exists when relevant conditions and events, considered in the aggregate, indicate that it is probable that an entity will be unable to meet its obligations as they become due within one year after the date that the financial statements are issued (or are available to be issued). The new guidance is effective for annual reporting periods ending after December 15, 2016 (the year ending December 31, 2016 for the Company) and interim periods thereafter, with early adoption permitted. Deferred Financing Costs. On April 7, 2015, the FASB issued accounting guidance that requires deferred financing costs to be presented as a direct reduction from the related debt liability in the financial statements rather than as a separately recognized asset. Under the new guidance, amortization of such costs will continue to be reported as interest expense. In August 2015, an update was issued that clarified that debt issuance costs associated with line-of-credit arrangements may continue to be reported as an asset. The new guidance became effective retrospectively for interim and annual periods beginning after December 15, 2015 (January 1, 2016 for the Company). There was no material impact to the Company's results of operations or cash flows in connection with the adoption of the guidance. The impact to the Company's condensed consolidated balance sheets as of December 31, 2015 was as follows: Before Application of Accounting Guidance Adjustment After Application of Accounting Guidance (Dollars in millions) Other current assets $ 503.1 $ (55.5 ) $ 447.6 Investments and other assets 382.6 (18.9 ) 363.7 Total assets 11,021.3 (74.4 ) 10,946.9 Current portion of long-term debt 5,930.4 (55.5 ) 5,874.9 Long-term debt, less current portion 385.2 (18.9 ) 366.3 Total liabilities 10,102.8 (74.4 ) 10,028.4 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. Under the originally issued standard, the new guidance would have been effective for interim and annual periods beginning after December 15, 2016 (January 1, 2017 for the Company). On July 9, 2015, the FASB decided to delay the effective date of the new revenue recognition standard by one year with early adoption permitted, but not before the original effective date. The standard allows for either a full retrospective adoption or a modified retrospective adoption. 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. 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 will be effective prospectively for annual periods beginning after December 15, 2016 (January 1, 2017 for the Company), and interim periods therein, with early adoption permitted. 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. Income Taxes. In November 2015, the FASB issued accounting guidance that requires entities to classify all deferred tax assets and liabilities, along with any related valuation allowance as noncurrent on the balance sheet. Under the new guidance, each jurisdiction will now only have one net noncurrent deferred tax asset or liability. The new guidance does not change the existing requirement that only permits offsetting within a jurisdiction. The new guidance will be effective prospectively or retrospectively for annual periods beginning after December 15, 2016 (January 1, 2017 for the Company) and interim periods therein, with early adoption permitted. While the Company does not anticipate an impact to its results of operations or cash flows in connection with the adoption of this guidance, there will be an impact on the presentation of the Company's condensed consolidated balance sheets. The impact to the condensed consolidated balance sheets will depend upon the facts and circumstances at the time of adoption. Lease Accounting. In February 2016, the FASB issued accounting guidance that will require a lessee to recognize in 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. 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 will be effective prospectively for annual periods beginning after December 15, 2016 (January 1, 2017 for the Company) and interim periods therein, with early adoption permitted. 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 this update 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.

Liabilities Subject to Compromi

Liabilities Subject to Compromise (Notes)	9 Months Ended
	Sep. 30, 2016
Liabilities Subject to Compromise [Abstract]
Liabilities subject to compromise [Text Block]	Liabilities Subject to Compromise Liabilities subject to compromise include unsecured or under-secured 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 may be assumed under a plan of reorganization, and as such, may be subsequently reclassified to liabilities not subject to compromise. Generally, actions to enforce or otherwise effect payment of prepetition liabilities are subject to the automatic stay, as discussed in Note 1. "Basis of Presentation". Liabilities subject to compromise consisted of the following: Previously Reported Balance Sheet Line September 30, 2016 (Dollars in millions) Debt (1) $ 7,920.4 Interest payable 172.6 Trade payables 77.3 Environmental liabilities 62.9 Postretirement benefit obligations (2) 34.0 UMWA 1974 Pension Plan liability (3) 25.0 Property taxes 7.1 Other accrued liabilities 32.3 Liabilities subject to compromise $ 8,331.6 (1) Includes $7,601.6 million of debt, $257.3 million of derivative contract terminations, and $61.5 million of liabilities secured by prepetition letters of credit. (2) Includes liabilities for unfunded non-qualified pension plans, all the participants of which are former employees. (3) Refer to Note 20. "Matters Related to the Bankruptcy of Patriot Coal Corporation" for additional information.

Asset Impairment (Notes)

Asset Impairment (Notes)	9 Months Ended
	Sep. 30, 2016
Asset Impairment Charges [Abstract]
Asset Impairment Charges [Text Block]	Asset Impairment The Company's mining and exploration assets and mining-related investments may be adversely affected by numerous uncertainties that may cause the Company to be unable to recover all or a portion of the carrying value of those assets. Because of the volatile and cyclical nature of U.S. and international seaborne coal demand, it is reasonably possible that prices may decrease 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. The Company's assets whose recoverability and values are most sensitive to near-term pricing and other market factors include certain Australian metallurgical and thermal assets for which impairment charges were recorded in 2015 and certain U.S. coal properties being leased to unrelated mining companies under agreements that require royalties to be paid as the coal is mined. These assets had an aggregate carrying value of $577.7 million as of September 30, 2016 . The Company conducted a review of those assets for recoverability as of September 30, 2016 and determined that no impairment charge was necessary as of that date. As further discussed in Note 23. “Subsequent Event”, the Company has entered into an agreement for the sale of its Metropolitan mine. As a result of entering into the transaction, and the approval of the Company’s Board of Directors of such a transaction in October 2016, the Metropolitan mine was deemed to meet held-for-sale accounting criteria in the fourth quarter of 2016. Accordingly, the Company expects to record an after-tax impairment charge of approximately $180 million to write down the assets to their estimated selling price, which is the best estimate of fair value under a held-for-sale accounting model, in the fourth quarter of 2016. The carrying value of the mine is included in the value of assets noted as at-risk in the preceding paragraph. Three and Nine Months Ended September 30, 2016 The Company reviewed its portfolio of mining tenements and surface lands that were classified as held-for-sale. As a result of that review, the Company recognized an aggregate impairment charge of $17.2 million during the nine months ended September 30, 2016 to write down the carrying value of certain Australian metallurgical assets targeted for divestiture, and eventually divested, to their estimated fair value. For additional information regarding those divested assets, refer to Note 16. "Other Events". Nine Months Ended September 30, 2015 The following costs are reflected in "Asset impairment" in the unaudited condensed consolidated statement of operations for the nine months ended September 30, 2015 : Reportable Segment Australian Metallurgical Mining Australian Thermal Mining Corporate and Other Consolidated (Dollars in millions) Asset impairment charges: Long-lived assets $ 527.0 $ 8.2 $ 182.2 $ 717.4 Equity method investments — — 183.4 183.4 Total $ 527.0 $ 8.2 $ 365.6 $ 900.8 Australian Metallurgical and Thermal Mining Due to the severity of the decline in seaborne metallurgical and thermal coal pricing observed during the first half of 2015 and other adverse conditions noted during that period, the Company concluded that indicators of impairment existed surrounding its Australian mining platform as of June 30, 2015. Accordingly, the Company reviewed its Australian mining assets for recoverability and, based on that review, determined that the carrying values of three of its active mines that produce metallurgical coal were not recoverable and recognized an aggregate impairment charge of $230.5 million to write those assets down from their carrying value to their estimated fair value. Also during the second quarter of 2015, the Company reviewed its portfolio of mining tenements and surface lands to identify non-strategic assets that could be monetized. In connection with that review, certain of such assets were deemed to meet held-for-sale accounting criteria or were otherwise considered more likely to generate cash flows through divestiture rather than development, with the long-term plans for certain adjacent assets also consequently affected. Accordingly, the Company recognized an aggregate impairment charge of $304.7 million to write down those assets from their carrying value to their estimated fair value. Corporate and Other Long-lived Assets. In connection with a similar review of the Company's asset portfolio conducted during the second quarter of 2015 to identify non-strategic domestic assets that could be monetized, the Company identified non-strategic, non-coal-supplying assets as held-for-sale rather than held-for-use as of June 30, 2015. Accordingly, the Company recognized an impairment charge of $182.2 million to write the assets down from their carrying value to estimated fair value. Equity Method Investments. Due to the impairment indicators noted above surrounding the Company's Australian platform, the Company reviewed its total investment in Middlemount Coal Pty Ltd. (Middlemount), which owns the Middlemount Mine in Queensland, Australia, as of June 30, 2015. As a result of that review, the Company determined that the carrying value of its total investment in Middlemount was other-than-temporarily impaired and recorded a charge of $46.6 million to write-off the equity investment and recorded a charge of $136.8 million to write down the carrying value of certain of its loans to Middlemount. The fair value estimates made during the Company's impairment assessments were determined in accordance with the methods outlined in Note 1. "Summary of Significant Accounting Policies" to the consolidated financial statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2015, except in certain instances where indicative bids were received related to non-strategic assets being marketed for divestiture. In those instances, the indicative bids were also considered in estimating fair value.

Discontinued Operations

Discontinued Operations	9 Months Ended
	Sep. 30, 2016
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 three and nine months ended September 30, 2016 and 2015: Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 (Dollars in millions) Loss from discontinued operations, net of income taxes $ (38.1 ) $ (157.5 ) $ (44.5 ) $ (202.7 ) 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: September 30, 2016 December 31, 2015 (Dollars in millions) Assets: Other current assets $ 3.9 $ 3.1 Investments and other assets 13.2 13.2 Total assets classified as discontinued operations $ 17.1 $ 16.3 Liabilities: Accounts payable and accrued expenses $ 30.2 $ 60.0 Other noncurrent liabilities 197.0 203.7 Liabilities subject to compromise 45.9 — Total liabilities classified as discontinued operations $ 273.1 $ 263.7 Patriot-Related Matters. During the three months ended September 30, 2016, the Company recognized a charge of $35.0 million for the UMWA 1974 Pension Plan, consisting of a $10.0 million cash liability and an allowed unsecured claim of $25.0 million , to "Loss from discontinued operations, net of income taxes" in the unaudited condensed consolidated statement of operations. Refer to Note 20. "Matters Related to the Bankruptcy of Patriot Coal Corporation" for information surrounding charges recorded during the three and nine months ended September 30, 2016 and 2015 associated with the bankruptcy of Patriot. Wilkie Creek Mine. In December 2013, the Company ceased production and started reclamation of the Wilkie Creek Mine in Queensland, Australia. On June 30, 2014, Queensland Bulk Handling Pty Ltd (QBH) commenced litigation against Peabody (Wilkie Creek) Pty Limited, the indirect wholly-owned subsidiary of the company that owns the Wilkie Creek Mine, alleging breach of a Coal Port Services Agreement (CPSA) between the parties. Included in "Loss from discontinued operations, net of income taxes" for the year ended December 31, 2015 is a charge of $9.7 million related to that litigation, of which $7.6 million was recorded in the nine months ended September 30, 2015. On September 30, 2016, the Company paid $13.0 million Australian dollars ( $9.9 million USD) to QBH in a full and complete settlement of the litigation. Refer to Note 19. "Commitments and Contingencies" for additional information surrounding the QBH matter. In June 2015, the Company entered into a conditional agreement to sell the Wilkie Creek Mine. The agreement was subsequently terminated in October 2015 in conjunction with entering into a new agreement with similar terms. The second agreement was terminated in March 2016.

Inventories

Inventories	9 Months Ended
	Sep. 30, 2016
Inventory Disclosure [Abstract]
Inventories	Inventories Inventories as of September 30, 2016 and December 31, 2015 consisted of the following: September 30, 2016 December 31, 2015 (Dollars in millions) Materials and supplies $ 110.7 $ 115.9 Raw coal 53.0 75.9 Saleable coal 95.9 116.0 Total $ 259.6 $ 307.8 Materials and supplies inventories presented above have been shown net of reserves of $6.0 million and $4.7 million as of September 30, 2016 and December 31, 2015 , respectively.

Derivatives and Fair Value Meas

Derivatives and Fair Value Measurements	9 Months Ended
	Sep. 30, 2016
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 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. During the fourth quarter of 2015, the Company performed an assessment of its risk of nonperformance with respect to derivative financial instruments designated as cash flow hedges in light of three rating agencies downgrading the Company's corporate credit rating during 2015 and declining financial results. The Company determined its hedging relationships were expected to be "highly effective" throughout 2015 based on its quarterly assessments. However, as a result of a deterioration in the Company's credit profile, the Company could no longer conclude, as of December 31, 2015, that its hedging relationships were expected to be "highly effective" at offseting the changes in the anticipated exposure of the hedged item. Therefore, the Company discontinued the application of cash flow hedge accounting subsequent to December 31, 2015 and changes in the fair value of derivative instruments have been recorded as operating costs and expenses in the accompanying unaudited condensed consolidated statements of operations. Previous fair value adjustments recorded in "Accumulated other comprehensive loss" will be frozen until the underlying transactions impact the Company's earnings. The Company's Bankruptcy Petitions constituted an event of default under the Company's derivative financial instrument contracts and the counterparties terminated the agreements shortly thereafter in accordance with contractual terms. The terminated positions are first-lien obligations under the Company's secured credit agreement dated September 24, 2013 (as amended, the 2013 Credit Facility). The net settlement liability was accounted for as a prepetition liability subject to compromise without credit valuation adjustments. As of September 30, 2016, the Company had no derivative financial instruments in place in relation to diesel fuel or foreign currency exchange rate. Based on the previous fair value adjustments of the Company's foreign currency hedge contract portfolio recorded in "Accumulated other comprehensive loss", the net loss expected to be reclassified from comprehensive income to earnings over the next 12 months associated with that hedge program is approximately $68 million . Based on the previous fair value adjustments of the Company’s diesel fuel hedge contract portfolio recorded in “Accumulated other comprehensive loss”, the net loss expected to be reclassified from comprehensive income to earnings over the next 12 months associated with that hedge program is approximately $50 million . The tables below show the classification and amounts of pre-tax gains and losses related to the Company’s Corporate Hedging derivatives during the three and nine months ended September 30, 2016 and 2015 : Three Months Ended September 30, 2016 Financial Instrument Income Statement Total realized loss recognized in income Loss reclassified from other comprehensive loss into income (Loss) gain recognized 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 ) $ — $ — Three Months Ended September 30, 2015 Financial Instrument Income Statement Classification of (Losses) Gains Loss recognized in other comprehensive income on derivatives (effective portion) Loss reclassified from other comprehensive income into income (effective portion) (1) Loss reclassified from other comprehensive income into income (ineffective portion) (Dollars in millions) Commodity swap contracts Operating costs and expenses $ (63.1 ) $ (31.9 ) $ (0.5 ) Foreign currency forward contracts Operating costs and expenses (118.2 ) (84.5 ) — Total $ (181.3 ) $ (116.4 ) $ (0.5 ) (1) Includes the reclassification from "Accumulated other comprehensive loss" into earnings of $0.1 million of previously unrecognized gains on foreign currency cash flow hedge contracts monetized in the fourth quarter of 2012. Nine Months Ended September 30, 2016 Financial Instrument Income Statement Total realized loss recognized in income Loss reclassified from other comprehensive income into income (1) (Loss) gain recognized in income on derivatives Unrealized (loss) gain recognized in income on non- designated derivatives (Dollars in millions) Commodity swap contracts Operating costs and expenses $ (78.4 ) $ (66.4 ) $ (11.9 ) $ — Commodity swap contracts Reorganization items (38.8 ) — (38.8 ) — Foreign currency forward contracts Operating costs and expenses (119.4 ) (122.1 ) 2.7 — Foreign currency forward contracts Reorganization items (36.4 ) — (36.4 ) — Total $ (273.0 ) $ (188.5 ) $ (84.4 ) $ — (1) Includes the reclassification from "Accumulated other comprehensive 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. Nine Months Ended September 30, 2015 Financial Instrument Income Statement Classification of (Losses) Gains Loss recognized in other comprehensive income on derivatives (effective portion) Loss reclassified from other comprehensive income into income (effective portion) (1) Gain reclassified from other comprehensive income into income (ineffective portion) (Dollars in millions) Commodity swap contracts Operating costs and expenses $ (27.3 ) $ (89.0 ) $ 1.3 Foreign currency forward contracts Operating costs and expenses (137.2 ) (238.9 ) — Total $ (164.5 ) $ (327.9 ) $ 1.3 (1) Includes the reclassification from "Accumulated other comprehensive loss" into earnings of $14.9 million of previously unrecognized gains on foreign currency cash flow hedge contracts monetized in the fourth quarter of 2012. 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. Offsetting and Balance Sheet Presentation The Company's Corporate Hedging derivative financial instruments were transacted in over-the-counter (OTC) markets with financial institutions under International Swaps and Derivatives Association (ISDA) Master Agreements. Those agreements contain symmetrical default provisions which allow for the net settlement of amounts owed by either counterparty in the event of default or contract termination. The Company offsets its Corporate Hedging asset and liability derivative positions on a counterparty-by-counterparty basis in the condensed consolidated balance sheets, with the fair values of those respective derivatives reflected in “Other current assets,” “Investments and other assets,” “Accounts payable and accrued expenses” and “Other noncurrent liabilities." Though the symmetrical default provisions associated with the Company's Corporate Hedging derivatives exist at the overall counterparty level across its foreign currency and diesel fuel hedging strategy derivative contract portfolios, the Company's accounting policy is to apply counterparty offsetting separately within those derivative contract portfolios for presentation in the condensed consolidated balance sheets because that application is more consistent with the fact that the Company generally net settles its Corporate Hedging derivatives with each counterparty by derivative contract portfolio on a routine basis. The classification and amount of Corporate Hedging derivative financial instruments presented on a gross and net basis as of December 31, 2015 are presented in the table that follows. Financial Instrument Fair Value of Liabilities Presented in the Condensed Consolidated Balance Sheet as of December 31, 2015 (1) (Dollars in millions) Current Liabilities: Commodity swap contracts $ 86.1 Foreign currency forward contracts 145.6 Total $ 231.7 Noncurrent Liabilities: Commodity swap contracts $ 37.6 Foreign currency forward contracts 55.1 Total $ 92.7 (1) All commodity swap contracts and foreign currency forward contracts were in a liability position as of December 31, 2015. See Note 9. "Coal Trading" for information on balance sheet offsetting related to the Company’s coal trading activities. 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 liability positions for which fair value is measured on a recurring basis: December 31, 2015 Level 1 Level 2 Level 3 Total (Dollars in millions) Commodity swap contracts — — (123.7 ) (123.7 ) Foreign currency contracts — — (200.7 ) (200.7 ) Total net financial liabilities $ — $ — $ (324.4 ) $ (324.4 ) As of September 30, 2016, the Company no longer had 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: • 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. The following table summarizes the changes related to the Company’s Corporate Hedging derivative financial instruments recurring Level 3 financial liabilities: Nine Months Ended September 30, 2016 Commodity Contracts Foreign Currency Contracts Total (Dollars in millions) Beginning of period $ 123.7 $ 200.7 $ 324.4 Total net losses realized/unrealized: Included in earnings (1) 15.7 (48.0 ) (32.3 ) Settlements / terminations (139.4 ) (152.7 ) (292.1 ) End of period $ — $ — $ — (1) Includes reorganization items and realized gains (losses) The Company had no transfers between Levels 1, 2 and 3 during the three and nine months ended September 30, 2016 or 2015. Transfers into Level 3 of liabilities previously classified in Level 2 during the year ended December 31, 2015 were due to the relative value of unobservable inputs to the total fair value measurement of certain derivative contracts rising above the 10% threshold. The Company’s policy is to value all transfers between levels using the beginning of period valuation. Other Financial Instruments. The Company used the following methods and assumptions in estimating fair values for other financial instruments as of September 30, 2016 and December 31, 2015 : • Cash and cash equivalents, restricted cash, 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 September 30, 2016 is subject to compromise in connection with the Company's plan of reorganization and as such has been excluded from the table below. The carrying amount and estimated fair value of the Company's current and long-term debt as of December 31, 2015 are summarized as follows: December 31, 2015 Carrying Amount Estimated Fair Value (Dollars in millions) Current and Long-term debt $ 6,241.2 $ 1,372.7

Coal Trading

Coal Trading	9 Months Ended
	Sep. 30, 2016
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 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 (losses) revenues recognized during the three and nine months ended September 30, 2016 and 2015 were as follows: Three Months Ended Nine Months Ended September 30, September 30, Trading Revenues by Type of Instrument 2016 2015 2016 2015 (Dollars in millions) Futures, swaps and options $ (32.4 ) $ 47.7 $ (68.7 ) $ 89.4 Physical purchase/sale contracts 13.2 (23.2 ) 36.1 (46.7 ) Total trading (losses) revenues $ (19.2 ) $ 24.5 $ (32.6 ) $ 42.7 Risk Management Hedge Ineffectiveness. In some instances, the Company has designated an existing coal trading derivative as a hedge and, thus, the derivative has a non-zero fair value at hedge inception. The “off-market” nature of these derivatives, which is best described as an embedded financing element within the derivative, is a source of ineffectiveness. In other instances, the Company uses a coal trading derivative that settles at a different time, has different quality specifications or has a different location basis than the occurrence of the cash flow being hedged. These collectively yield ineffectiveness to the extent that the derivative hedge contract does not exactly offset changes in the fair value or expected cash flows of the hedged item. The Company had no coal trading positions designated as cash flow hedges as of September 30, 2016 and December 31, 2015 . 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 closed positions. The Company must post cash collateral, known as 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 OTC markets with financial institutions and other non-financial trading entities under 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, initial and 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, 2016 and December 31, 2015 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 (Held) Posted (1) Net Amounts of Assets (Liabilities) Presented in the Condensed Consolidated Balance Sheets (Dollars in millions) Fair Value as of September 30, 2016 Assets from coal trading activities, net $ 169.9 $ (149.1 ) $ (0.9 ) $ 19.9 Liabilities from coal trading activities, net (227.4 ) 149.1 58.8 (19.5 ) Total, net $ (57.5 ) $ — $ 57.9 $ 0.4 Fair Value as of December 31, 2015 Assets from coal trading activities, net $ 128.6 $ (87.3 ) $ (17.8 ) $ 23.5 Liabilities from coal trading activities, net (110.0 ) 87.3 7.1 (15.6 ) Total, net $ 18.6 $ — $ (10.7 ) $ 7.9 (1) None of the net variation margin held at September 30, 2016 and December 31, 2015, respectively, related to cash flow hedges. See Note 8. "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, 2016 and December 31, 2015 : September 30, 2016 Level 1 Level 2 Level 3 Total (Dollars in millions) Futures, swaps and options $ — $ (0.1 ) $ (0.2 ) $ (0.3 ) Physical purchase/sale contracts — 1.2 (0.5 ) 0.7 Total net financial assets (liabilities) $ — $ 1.1 $ (0.7 ) $ 0.4 December 31, 2015 Level 1 Level 2 Level 3 Total (Dollars in millions) Futures, swaps and options $ — $ 3.3 $ — $ 3.3 Physical purchase/sale contracts — 20.2 (15.6 ) 4.6 Total net financial assets (liabilities) $ — $ 23.5 $ (15.6 ) $ 7.9 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), LCH.Clearnet (formerly known as the London Clearing House), NOS Clearing ASA 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 2015, the credit valuation adjustments as of September 30, 2016 and December 31, 2015 are considered to be significant unobservable inputs in the valuation of the contracts resulting in Level 3 classification. 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 discounted cash flow 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 heat rate and 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. The following table summarizes the quantitative unobservable inputs utilized in the Company's internally-developed valuation models for physical commodity purchase/sale contracts classified as Level 3 as of September 30, 2016 : Range Weighted Input Low High Average Quality adjustments 2 % 2 % 2 % Location differentials 9 % 9 % 9 % Credit and non-performance risk 26 % 26 % 26 % 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 assets: Three Months Ended September 30, Nine Months Ended September 30, 2016 2015 2016 2015 (Dollars in millions) Beginning of period $ (1.1 ) $ 1.8 $ (15.6 ) $ 2.1 Transfers into Level 3 4.6 — 5.0 — Transfers out of Level 3 (11.1 ) — (0.4 ) — Total gains realized/unrealized: Included in earnings 2.6 — 1.2 0.5 Sales 0.1 — — — Settlements 4.2 (0.5 ) 9.1 (1.3 ) End of period $ (0.7 ) $ 1.3 $ (0.7 ) $ 1.3 The Company had no transfers between Levels 1 and 2 during the three and nine months ended September 30, 2016 and 2015 . Transfers of liabilities into/out of Level 3 from/to Level 2 during 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 (losses) gains relating to Level 3 net financial assets held both as of the beginning and the end of the period: Three Months Ended September 30, Nine Months Ended September 30, 2016 2015 2016 2015 (Dollars in millions) Changes in unrealized gains (losses) (1) $ 0.1 $ 0.1 $ (0.1 ) $ 0.4 (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, 2016 , the Company's trading portfolio was expected to have negative net cash realizations in total, with positive realizations in 2016 and 2018 and net negative realization in 2017. As of September 30, 2016 , the timing of the estimated future realization of the value of the Company’s trading portfolio, on a cumulative cash basis, was as follows: Percentage of Year of Expiration Portfolio Total 2016 66 % 2017 (171 )% 2018 5 % (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, 2016 , 65% of the Company’s credit exposure related to coal trading activities with investment grade counterparties, while 11% was with non-investment grade counterparties and 24% was with counterparties that are not rated. Performance Assurances and Collateral 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, 2016 and December 31, 2015 , would have amounted to collateral postings to counterparties of approximately $1 million and $21 million , respectively. As of September 30, 2016 , the Company was required to post approximately $4 million in collateral to counterparties for such positions. No collateral was required to be posted to counterparties as of December 31, 2015 . 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 2016, each of the three rating agencies downgraded the Company's corporate credit rating due to the Bankruptcy Petitions. Despite the rating agencies downgrades, the Company’s additional collateral requirement owed to its counterparties for these ratings based derivative trading instruments would have been zero at September 30, 2016 and December 31, 2015 based on the aggregate fair value of all derivative trading instruments with such features. As of September 30, 2016 and December 31, 2015 , no collateral was posted to counterparties to support such derivative trading instruments. 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, 2016 and December 31, 2015 , the Company posted a net variation margin of $57.9 million and held a net variation margin of $10.7 million , respectively. In addition to the requirements surrounding variation margin, the Company is required by the exchanges upon which it transacts and by certain of its OTC arrangements 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. As of September 30, 2016 and December 31, 2015 , the Company had posted initial margin of $11.3 million and $9.2 million , respectively, which is reflected in “Other current assets” in the condensed consolidated balance sheets. As of September 30, 2016 and December 31, 2015 , the Company was in receipt of $1.3 million and $0.7 million of margin in excess of the required variation and initial margin.

Financing Receivables

Financing Receivables	9 Months Ended
	Sep. 30, 2016
Financing Receivables [Abstract]
Financing Receivables [Text Block]	Financing Receivables The Company's total financing receivables as of September 30, 2016 and December 31, 2015 consisted of the following: Balance Sheet Classification September 30, 2016 December 31, 2015 (Dollars in millions) Other current assets $ — $ 20.0 Investments and other assets 68.6 65.2 Total financing receivables $ 68.6 $ 85.2 The Company periodically assesses the collectability of accounts and loans receivable by considering factors such as specific evaluation of collectability, historical collection experience, the age of the receivable and other available evidence. Below is a description of the Company's financing receivables outstanding as of September 30, 2016 . Codrilla Mine Project. In 2011, a wholly-owned subsidiary of PEA-PCI, then Macarthur Coal Limited, completed the sale of a portion of its 85% interest in the Codrilla Mine Project to the other participants of the Coppabella Moorvale Joint Venture, afterward retaining 73.3% ownership.The final outstanding installment payment of 40% of the sale price was due upon the earlier of the mine's first coal shipment or a specified date. The sales agreement was amended in the second quarter of 2013 to delay the specified date from March 31, 2015 to June 30, 2016. The remaining balance was received during the nine months ended September 30, 2016. At December 31, 2015, the balance associated with these receivables totaled $20.0 million and was recorded in "Other current assets" in the condensed consolidated balance sheets. Middlemount. The Company periodically makes loans (Priority Loans) to Middlemount, in which the Company owns a 50% equity interest, pursuant to the related shareholders’ agreement for purposes of funding capital expenditures and working capital requirements. The Priority Loans bear interest at a rate equal to the monthly average 30-day Australian Bank Bill Swap Reference Rate plus 3.5% and expire on December 31, 2016. Based on the existence of letters of support from related entities of the shareholders, 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. 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. Refer to Note 2. "Asset Impairment" to the consolidated financial statements included in the Company's Annual Report on form 10-K for the year ended December 31, 2015 for background surrounding the impairment charge recognized in 2015 related to Middlemount. The carrying value of the loans of $58.3 million and $65.2 million was reflected in "Investments and other assets" in the condensed consolidated balance sheets as of September 30, 2016 and December 31, 2015 , respectively. On August 8, 2016, one of the Company's Australian subsidiaries and the other shareholder of Middlemount entered into an agreement to provide a revolving loan (Revolving Loans) to Middlemount not to exceed $60.0 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, 2017. As of September 30, 2016, the carrying value of the Revolving Loans due to the Company's Australian subsidiary was $10.3 million .

Property, Plant, Equipment and

Property, Plant, Equipment and Mine Development (Notes)	9 Months Ended
	Sep. 30, 2016
Property, Plant, Equipment and Mine Development [Abstract]
Property, Plant and Equipment Disclosure [Text Block]	Property, Plant, Equipment and Mine Development Property, plant, equipment and mine development, net, as of September 30, 2016 and December 31, 2015 consisted of the following: September 30, 2016 December 31, 2015 (Dollars in millions) Land and coal interests $ 10,756.7 $ 10,503.7 Buildings and improvements 1,533.0 1,506.0 Machinery and equipment 2,272.5 2,280.4 Less: Accumulated depreciation, depletion and amortization (5,346.7 ) (5,031.6 ) Total, net $ 9,215.5 $ 9,258.5

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company's income tax benefit of $12.9 million and provision of $6.9 million for the three months ended September 30, 2016 and 2015, respectively, included a tax provision of $0.3 million and benefit of $0.8 million , respectively, related to the remeasurement of foreign income tax accounts. The Company’s income tax benefits of $108.7 million and $83.2 million for the nine months ended September 30, 2016 and 2015, respectively, included a tax benefit related to the remeasurement of foreign income tax accounts of $1.0 million for the nine months ended September 30, 2015. The Company's effective tax rate before remeasurement for the nine months ended September 30, 2016 is based on the Company’s estimated full year effective tax rate, comprised of expected statutory tax benefit, offset by foreign rate differential and changes in valuation allowance, plus tax benefits for expected refunds for U.S. net operating loss carrybacks and a tax allocation to results from continuing operations related to the tax effects of items credited directly to “Other comprehensive income”.

Long-term Debt (Notes)

Long-term Debt (Notes)	9 Months Ended
	Sep. 30, 2016
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	Current and Long-term Debt The Company’s total indebtedness as of September 30, 2016 and December 31, 2015 consisted of the following: September 30, 2016 December 31, 2015 (Dollars in millions) 2013 Revolver $ 1,388.4 $ — 2013 Term Loan Facility due September 2020 1,154.5 1,156.3 6.00% Senior Notes due November 2018 1,509.9 1,508.9 6.50% Senior Notes due September 2020 645.8 645.5 6.25% Senior Notes due November 2021 1,327.7 1,327.0 10.00% Senior Secured Second Lien Notes due March 2022 962.3 960.4 7.875% Senior Notes due November 2026 245.9 245.8 Convertible Junior Subordinated Debentures due December 2066 367.1 366.3 DIP Term Loan Facility 470.5 — Capital lease obligations 22.1 30.3 Other 0.5 0.7 8,094.7 6,241.2 Less: Liabilities subject to compromise 7,601.6 — Less: Current portion of long-term debt 493.1 5,874.9 Long-term debt $ — $ 366.3 The carrying amounts of the 2013 Term Loan Facility due September 2020, the 6.00% Senior Notes due November 2018, the 6.50% Senior Notes due September 2020, the 6.25% Senior Notes due November 2021, the 10.00% Senior Secured Second Lien Notes due March 2022 (the Senior Secured Second Lien Notes), the 7.875% Senior Notes due November 2026, the Convertible Junior Subordinated Debentures due December 2066 (the Debentures) and the DIP Term Loan Facility (as defined below) have been presented above net of the respective unamortized debt issuance costs and original issue discounts, as applicable. The Company's consolidated financial statements as of December 31, 2015 were prepared under a going concern opinion, and as such, all of its long-term debt with the exception of the Debentures was classified as current. As of September 30, 2016 , all of the Company's long-term debt with the exception of the DIP Term Loan Facility (as defined below) and certain other debt arrangements was recorded in “Liabilities subject to compromise” in the condensed consolidated balance sheets. The DIP Term Loan Facility (as defined below) and certain other debt arrangements were recorded in “Current portion of long-term debt” in the condensed consolidated balance sheets as of September 30, 2016 . During the first quarter of 2016, the Company borrowed $947.0 million under the $1.65 billion revolving credit facility (as amended, the 2013 Revolver) for general corporate purposes. As of the Petition Date, the Company had approximately $675 million letters of credit outstanding on the 2013 Revolver. Subsequent to the Petition Date, certain counterparties drew on a portion of those letters of credit. The letters of credit were in place to support various types of obligations, though the most significant items related to bank guarantees in place for certain reclamation obligations in Australia. The draws required the recording of previously off-balance sheet liabilities, except in certain instances where the Company had previously recorded a liability, and as such have been reflected as additional borrowings under the 2013 Revolver. The total of such letters of credit was $441.4 million as of September 30, 2016 . "Investments and other assets" in the condensed consolidated balance sheets as of September 30, 2016 includes $343.7 million of collateral in support of certain of these obligations. As a result of filing the Bankruptcy Petitions on April 13, 2016, as discussed in Note 1. "Basis of Presentation", the Company is in default under the 2013 Credit Facility and as such the 2013 Revolver can no longer be utilized. Additional information regarding the Company's current and long-term debt is outlined in Note 12 to the consolidated financial statements in the Company's Annual Report on Form 10-K for the year ended December 31, 2015 . The filing of the Bankruptcy Petitions constituted an event of default that accelerated Peabody’s obligations under the following debt instruments (collectively, the “Debt Instruments”): • 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; • 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 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 and the guarantors named therein; • 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 and the guarantors named therein; • 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 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 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 the 2013 Term Loan Facility and $1,650.0 million in the 2013 Revolver which includes approximately $675 million of posted but undrawn letters of credit and approximately $947 million in outstanding borrowings, by and among the Company, Citibank, N.A., as administrative agent, swing line lender and letter of credit (L/C) 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 Credit Agreement, dated as of February 5, 2015. During March 2016, the Company elected to exercise the 30-day grace period with respect to a $21.1 million semi-annual interest payment due March 15, 2016 on the 6.50% Senior Notes due September 2020 and a $50.0 million semi-annual interest payment due March 15, 2016 on the Senior Secured Second Lien Notes. The Company filed the Bankruptcy Petitions before the grace period lapsed, which stayed the related interest payments. As a result of the filing of the Bankruptcy Petitions, all unpaid principal and accrued and unpaid interest related to the Company's Debt Instruments due thereunder became immediately due and payable. Any efforts to enforce such payment obligations under the Debt Instruments are automatically stayed as a result of the Bankruptcy Petitions, and the creditors’ rights of enforcement in respect of the Debt Instruments are subject to the applicable provisions of the Bankruptcy Code. The Company is also required to pay monthly adequate protection payments to the First Lien Secured Parties in accordance with the rates defined in the 2013 Credit Facility. The adequate protection payments were recorded as "Interest expense" in the unaudited condensed consolidated statement of operations, which totaled $39.6 million and $64.2 million for the three and nine months ended September 30, 2016 , respectively. The Company has not recorded interest expense on the 6.00% Senior Notes due November 2018, the 6.50% Senior Notes due September 2020, the 6.25% Senior Notes due November 2021, the Debentures, the Senior Secured Second Lien Notes or the 7.875% Senior Notes due November 2026 since the filing of the Bankruptcy Petitions on the Petition Date. The Company's contractual interest obligation was $151.4 million and $417.1 million for the three and nine months ended September 30, 2016 , respectively; however, $92.9 million and $173.4 million of interest expense was automatically stayed during the three and nine months ended September 30, 2016 , respectively, in accordance with Section 502(b)(2) of the Bankruptcy Code. DIP Financing On the Petition Date, the Debtors also filed a motion (the DIP Motion) seeking authorization to use cash collateral and to approve financing (the DIP Financing) under that certain Superpriority Secured Debtor-In-Possession Credit Agreement (the DIP Credit Agreement) by and among the Company as borrower, Peabody Global Funding, LLC, formally known as the Global Center for Energy and Human Development and certain Debtors party thereto as guarantors (the Guarantors and together with the Company, the Loan Parties), the lenders party thereto (the DIP Lenders) and Citibank, N.A. as Administrative Agent (in such capacity, the DIP Agent) and L/C Issuer. The DIP Credit Agreement provides for (i) a term loan not to exceed $500 million (the DIP Term Loan Facility), of which $200 million was made available upon entry of an interim order, the remaining $300 million pending the entry of the final order approving the DIP Credit Agreement (the Final Order), secured by substantially all of the assets of the Loan Parties, subject to certain excluded assets and carve outs and guaranteed by the Loan Parties (other than the Company), which would be used for working capital and general corporate purposes, to cash collateralize letters of credit and to pay fees and expenses, (ii) a cash collateralized letter of credit facility in an amount up to $100 million (the L/C Facility), and (iii) a bonding accommodation facility in an amount up to $200 million consisting of (x) a carve-out from the collateral with superpriority claim status, subject only to the fees carve-out, entitling the authority making any bonding request to receive proceeds of collateral first in priority before distribution to any DIP Lender or other prepetition secured creditor, except for letters of credit issued under the DIP Credit Agreement and/or (y) a letter of credit facility (the Bonding L/C Facility). The aggregate face amount of all letters of credit issued under the L/C Facility and the Bonding L/C Facility shall not at any time exceed $50 million without DIP Lender consent. The DIP Credit Agreement includes covenants that, subject to certain exceptions, require the Company to maintain certain minimum thresholds of liquidity and consolidated EBITDA and to not exceed a certain maximum capital spend, and limit the ability of the Company and the Guarantors to, among other things: (i) make dispositions of material leases and contracts, (ii) make acquisitions, loans or investments, (iii) create liens on their property, (iv) dispose of assets, (v) incur indebtedness, (vi) merge or consolidate with third parties, (vii) enter into transactions with affiliated entities, and (viii) make material changes to their business activities. In addition to customary events of default, the DIP Credit Agreement contains the following milestones relating to the Chapter 11 Cases, certain of which milestones have been modified as reflected below pursuant to amendments to the DIP Credit Agreement entered into since the Petition Date, the failure of which, if not cured, amended or waived, would result in an event of default: • not later than 120 days following the Petition Date, delivery of the U.S. Business Plan and the Australian Business Plan (such plans were delivered to and approved by the DIP Lenders on August 10, 2016); • not later than the earlier to occur of (i) the date that is three business days following the entry of the Final Order and (ii) the date that is 45 days following the Petition Date, a declaratory judgment action shall be commenced by the Company (without prejudice to the rights of any party-in-interest to commence such a declaratory judgment action or any other proceeding) seeking a determination of the Principal Property Cap (including the amount thereof) and which of the U.S. Mine complexes are Principal Properties (the CNTA Issues), and not later than November 23, 2016, the Bankruptcy Court shall have entered an order determining the CNTA Issues (the CNTA Order Date); • not later than the later of (i) 30 days following the CNTA Order Date and (ii) December 14, 2016, the filing of an Acceptable Reorganization Plan (as defined below) and related disclosure statement; • not later than January 31, 2017, entry of an order approving a disclosure statement for an Acceptable Reorganization Plan; and • not later than 330 days following the Petition Date, the entry of an order confirming an Acceptable Reorganization Plan and not later than 360 days following the Petition Date, effectiveness of an Acceptable Reorganization Plan. “Acceptable Reorganization Plan” means a reorganization plan that (i) provides for the termination of the commitments and the payment in full in cash of the obligations under the DIP Credit Agreement (other than contingent indemnification obligations for which no claims have been asserted) on the consummation date of such reorganization plan and (ii) provides for customary releases of the DIP Agent, the DIP Lenders and the L/C Issuer and each of their respective representatives, from any and all claims against the DIP Agent, the DIP Lenders and the DIP L/C Issuer in connection with the DIP Credit Agreement or the cases to the fullest extent permitted by the Bankruptcy Code and applicable law. On April 15, 2016, the Bankruptcy Court issued an order approving the DIP Motion on an interim basis and authorizing the Loan Parties to, among other things, (i) enter into the DIP Credit Agreement and initially borrow up to $200 million , (ii) obtain a cash collateralized letter of credit facility in the aggregate amount of up to $100 million , and (iii) an accommodation facility for bonding requests in an aggregate stated amount of up to $200 million . On April 18, 2016, the Company entered into the DIP Credit Agreement with the DIP Lenders and borrowed $200 million under the DIP Term Loan Facility. On May 17, 2016, the Bankruptcy Court approved the DIP Financing on a final basis and entered an order to that effect on May 18, 2016. On May 19, 2016, following entry of the Final Order, the Company borrowed the remaining $300 million available under the DIP Term Loan Facility. The DIP Credit Agreement has been amended, as noted above and described in Note 1. "Basis of Presentation". The scheduled maturity under the DIP Credit Agreement is the earliest of (a) the Scheduled Termination Date, (b) 45 days after the entry of the Interim Order if the Final Order has not been entered prior to the expiration of such 45-day period (as such period may be extended with the consent of certain DIP Lenders), (c) the substantial consummation of a plan of reorganization filed in the cases that is confirmed pursuant to an order entered by the Bankruptcy Court, (d) the acceleration of the loans and the termination of commitments with respect to the DIP Credit Agreement and (e) a sale of all or substantially all of the assets of the Company (or the Loan Parties) pursuant to Section 363 of the Bankruptcy Code. Borrowings under the DIP Term Loan Facility bear interest at an interest rate per annum equal to, at the Company's option (i) LIBOR plus 9.00% , subject to a 1.00% LIBOR floor or (ii) the base rate plus 8.00% . “Scheduled Termination Date” means the date that is 12 months after the closing date; provided that such date may, at the election of the Company, be extended by up to an additional six months so long as, at the time such extension shall become effective, (w) there shall exist no default under the DIP Credit Agreement, (x) the representations and warranties of the Loan Parties therein shall be true and correct in all material respects, (y) the Company shall have paid or caused to be paid to the DIP Agent for the account of each DIP Lender an extension fee in an amount equal to 2.50% of such DIP Lender’s outstanding exposure under the DIP Term Loan Facility at such time and (z) the Company shall have delivered to the DIP Agent an updated DIP budget covering the additional period to be effected by such extension. The Company paid aggregate debt issuance costs of $25.6 million during the nine months ended September 30, 2016 related to the DIP Term Loan Facility, which will be amortized over a 12-month period. Intercompany Loan Agreement Prior to the Petition Date, the Company made available to its Australian platform a committed $250 million revolving intercompany loan facility (Intercompany Loan Agreement). The Intercompany Loan Agreement is designed to provide liquidity to support the ongoing operations of the Australian business during the Chapter 11 Cases, with draw amounts being tied to operating budgets and subject to certain availability restrictions. In accordance with the terms of the DIP Credit Agreement, the aggregate outstanding principal amount shall not exceed $250 million at any one time, which amount shall be subject to increase by up to $200 million with the written consent of the DIP Lenders. The consent of the DIP Lenders is also required to grant liens valued at 50% or more of the assets collateralizing the Intercompany Loan Agreement; however, as discussed in Note 1. "Basis of Presentation", the DIP Lenders have expressly consented to an amendment or waiver of provisions in the Intercompany Loan Agreement to permit the release or subordination of collateral thereunder, including as a result of potential asset sales, of up to $250 million in cash proceeds in the aggregate over the life of the Intercompany Loan Agreement and the agreement was amended accordingly. As of September 30, 2016 , $30.0 million was outstanding on the Intercompany Loan Agreement. Senior Secured Second Lien Notes Offering On March 16, 2015, the Company completed the offering of $1.0 billion aggregate principal amount of the Senior Secured Second Lien Notes. The notes were offered to qualified institutional buyers under Rule 144A of the Securities Act of 1933, as amended (the Securities Act), and to non-U.S. persons in transactions outside the U.S. under Regulation S of the Securities Act. 2016 Senior Notes Tender Offer and Redemption Concurrently with the offering of the Senior Secured Second Lien Notes, the Company commenced a tender offer to repurchase the $650.0 million aggregate principal amount then outstanding of the 7.375% Senior Notes due November 2016 (the 2016 Senior Notes). Consequently, the Company repurchased $566.9 million aggregate principal amount of the 2016 Senior Notes that were validly tendered and not validly withdrawn during March 2015. The Company redeemed the remaining $83.1 million aggregate principal amount of the 2016 Senior Notes on April 15, 2015. In connection with those repurchases, the Company recognized an aggregate loss on early debt extinguishment of $67.8 million in the unaudited condensed consolidated statement of operations for the nine months ended September 30, 2015 comprised of aggregate tender offer and make-whole premiums paid of $66.4 million and the non-cash write-off of associated unamortized debt issuance costs of $1.4 million .

Pension and Postretirement Bene

Pension and Postretirement Benefit Costs	9 Months Ended
	Sep. 30, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension and Postretirement Benefit Costs [Text Block]	Pension and Postretirement Benefit Costs Net periodic pension cost included the following components: Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 (Dollars in millions) Service cost for benefits earned $ 0.7 $ 0.7 $ 2.0 $ 2.0 Interest cost on projected benefit obligation 10.3 10.1 31.0 30.3 Expected return on plan assets (11.3 ) (12.0 ) (33.9 ) (36.1 ) Amortization of prior service cost and net actuarial loss 6.3 10.0 18.8 30.4 Net periodic pension cost $ 6.0 $ 8.8 $ 17.9 $ 26.6 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 (PBGC). Funding decisions also consider certain funded status thresholds defined by the Pension Protection Act of 2006 (generally 80% ). As of September 30, 2016, the Company's qualified plans were expected to be at or above the Pension Protection Act thresholds and therefore are expected to avoid benefit restrictions and at-risk penalties for 2016. During the three and nine months ended September 30, 2016, the Company contributed $0.4 million and $0.5 million respectively, to its qualified pension plans. During the nine months ended September 30, 2016, the Company contributed $0.6 million to its non-qualified pension plans. On November 2, 2015, the Bipartisan Budget Act of 2015 (BBA15) was signed into law, which extends pension funding stabilization provisions that were part of the Highway and Transportation Funding Act of 2014 (HATFA) and the Moving Ahead for Progress in the 21st Century Act of 2012 (MAP-21). Under BBA15, the pension funding stabilization provisions temporarily increased the interest rates used to determine pension liabilities for purposes of minimum funding requirements through 2020. Similar to MAP-21, BBA15 is not expected to change the Company's total required cash contributions over the long term, but is expected to reduce the Company's required cash contributions through 2020 if current interest rate levels persist. Based upon minimum funding requirements in accordance with HATFA and BBA15, the Company expects to contribute approximately $ 0.5 million to its pension plans to meet minimum funding requirements for its qualified plans in 2016. Contributions to non-qualified pension plans ceased subsequent to April 12, 2016 as a result of filing the Bankruptcy Petitions. Net periodic postretirement benefit cost included the following components: Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 (Dollars in millions) Service cost for benefits earned $ 2.6 $ 2.8 $ 7.8 $ 8.4 Interest cost on accumulated postretirement benefit obligation 8.5 8.4 25.6 25.3 Amortization of prior service cost and net actuarial loss 2.4 4.6 7.1 13.6 Net periodic postretirement benefit cost $ 13.5 $ 15.8 $ 40.5 $ 47.3

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss	9 Months Ended
	Sep. 30, 2016
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss The following table sets forth the after-tax components of accumulated other comprehensive loss and changes thereto recorded during the nine months ended September 30, 2016 : 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 Loss (Dollars in millions) December 31, 2015 $ (146.4 ) $ (263.8 ) $ 31.8 $ (240.5 ) $ (618.9 ) Reclassification from other comprehensive income to earnings — 15.8 (5.0 ) 119.0 129.8 Current period change 2.4 — — — 2.4 September 30, 2016 $ (144.0 ) $ (248.0 ) $ 26.8 $ (121.5 ) $ (486.7 ) The following table provides additional information regarding items reclassified out of "Accumulated other comprehensive loss" into earnings during the three months ended September 30, 2016 and 2015: Amount reclassified from accumulated other comprehensive loss (1) Details about accumulated other comprehensive loss components Three Months Ended September 30, 2016 Three Months Ended September 30, 2015 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 ) $ (6.3 ) Operating costs and expenses Defined benefit pension plans (5.1 ) (8.2 ) Operating costs and expenses Defined benefit pension plans (1.1 ) (1.6 ) Selling and administrative expenses Insignificant items 3.0 2.0 (8.4 ) (14.1 ) Total before income taxes 3.1 1.6 Income tax benefit $ (5.3 ) $ (12.5 ) Total after income taxes Prior service credit associated with postretirement plans: Postretirement health care and life insurance benefits $ 2.8 $ 1.7 Operating costs and expenses Defined benefit pension plans (0.1 ) (0.2 ) Operating costs and expenses 2.7 1.5 Total before income taxes (1.0 ) 0.2 Income tax (provision) benefit $ 1.7 $ 1.7 Total after income taxes Cash flow hedges: Foreign currency cash flow hedge contracts (28.0 ) $ (84.5 ) Operating costs and expenses Fuel and explosives commodity swaps (19.4 ) (32.4 ) Operating costs and expenses Coal trading futures, swaps and options — 13.2 Other revenues Insignificant items (0.1 ) (0.2 ) (47.5 ) (103.9 ) Total before income taxes 17.6 35.0 Income tax benefit $ (29.9 ) $ (68.9 ) Total after income taxes (1) Presented as gains (losses) in the unaudited condensed consolidated statements of operations. The following table provides additional information regarding items reclassified out of "Accumulated other comprehensive loss" into earnings during the nine months ended September 30, 2016 and 2015: Amount reclassified from accumulated other comprehensive loss (1) Details about accumulated other comprehensive loss components Nine Months Ended September 30, 2016 Nine Months Ended September 30, 2015 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 $ (15.4 ) $ (18.7 ) Operating costs and expenses Defined benefit pension plans (15.3 ) (24.7 ) Operating costs and expenses Defined benefit pension plans (3.2 ) (5.0 ) Selling and administrative expenses Insignificant items 8.8 6.0 (25.1 ) (42.4 ) Total before income taxes 9.3 12.1 Income tax benefit $ (15.8 ) $ (30.3 ) Total after income taxes Prior service credit associated with postretirement plans: Postretirement health care and life insurance benefits $ 8.3 $ 5.1 Operating costs and expenses Defined benefit pension plans (0.3 ) (0.7 ) Operating costs and expenses 8.0 4.4 Total before income taxes (3.0 ) (0.9 ) Income tax provision $ 5.0 $ 3.5 Total after income taxes Cash flow hedges: Foreign currency cash flow hedge contracts $ (122.1 ) $ (238.9 ) Operating costs and expenses Fuel and explosives commodity swaps (66.4 ) (87.7 ) Operating costs and expenses Coal trading futures, swaps and options — 35.6 Other revenues Insignificant items (0.4 ) (0.5 ) (188.9 ) (291.5 ) Total before income taxes 69.9 107.6 Income tax benefit $ (119.0 ) $ (183.9 ) Total after income taxes (1) Presented as gains (losses) in the unaudited condensed consolidated statements of operations.

Other Events (Notes)

Other Events (Notes)	9 Months Ended
	Sep. 30, 2016
Other Events [Abstract]
Other Events [Text Block]	Other Events Organizational Realignment From time to time, the Company initiates restructuring activities in connection with its repositioning efforts to appropriately align its cost structure or optimize its coal production relative to prevailing global coal industry conditions. Costs associated with restructuring actions can include early mine closures, voluntary and involuntary workforce reductions, office closures and other related activities. Costs associated with restructuring activities are recognized in the period incurred. In 2016, the Company has continued to drive operational efficiencies, optimize production across its mining platform and control operational and administrative expenses. Included in the Company's unaudited condensed consolidated statements of operations were aggregate restructuring charges, primarily comprised of cash severance costs, of $0.3 million and $1.8 million for the three months ended September 30, 2016 and 2015, respectively, and $15.5 million and $23.0 million , for the nine months ended September 30, 2016 and 2015, respectively. Restricted Cash As of September 30, 2016, the Company had restricted cash representing collateral for financial assurances associated with reclamation and other obligations of $70.6 million and $1.4 million included in “Investments and other assets” and "Restricted cash", respectively. Refer to Note 18. "Financial Instruments and Other Guarantees" for details regarding the remaining $22.8 million in restricted cash. Take-or-pay Obligations During the nine months ended September 30, 2016, the Company amended contracts to reduce certain U.S. transportation and logistics costs. In connection with these amendments, the Company will realize a net reduction of approximately $45 million in estimated liquidated damage payments that otherwise would have become due with respect to these take-or-pay obligations in 2017. In connection with these amendments, the Company paid liquidated damages of $15.5 million during the nine months ended September 30, 2016. Divestitures 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 nine months ended September 30, 2016. In May 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 for $64.1 million in cash plus a royalty stream. The transaction included Olive Downs South, Olive Downs South Extended and Willunga tenements. The Company recognized a gain on sale of $2.8 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 nine months ended September 30, 2016. In November 2015, the Company entered into a definitive agreement to sell its New Mexico and Colorado assets to a subsidiary of Bowie Resource Partners, LLC (Bowie) in exchange for cash proceeds of $358 million and the assumption of certain liabilities. Bowie agreed to pay the Company $20 million if it failed to obtain financing within the time frame allotted under the agreement (Termination Fee). Bowie did not obtain the necessary financing within the time allowed under the agreement, nor the additional time Peabody agreed to provide at Bowie's request. On April 12, 2016, Peabody then requested that the Termination Fee be paid, which Bowie has not done. The Company has brought action against Bowie to recover the Termination Fee, interest and certain costs. Customer Contract Amendment During the second quarter of 2016, the Company amended its arrangements concerning its long-term supply contract with the largest customer of its Australian Thermal Mining segment as a result of the Debtors' Bankruptcy Petitions. Coal under the supply contract is sourced from the Company's Wilpinjong Mine. The Bankruptcy Petitions enabled the customer to exercise their contractual step-in rights to appoint a receiver to operate the mine within the parameters of the agreement; however, the customer has not exercised this right. Under the new arrangements, the Company's subsidiary agreed to post cash collateral of $50.0 million Australian dollars by September 15, 2016, all of which was posted as of September 30, 2016 and is included in "Investments and other assets" in the condensed consolidated balance sheet. The subsidiary also agreed to maintain compliance with additional covenants and restrictions, including achieving minimum quarterly cash flow and production volumes in relation to specific forecasted amounts. If these conditions are met, the customer will not exercise their step-in rights to appoint a receiver. The arrangements provide for remedial action where certain covenants are not met; but noncompliance could result in termination of the amended arrangements and enable the customer to exercise step-in rights to appoint a receiver to operate the Wilpinjong Mine. As of November 2, 2016, the Company was in compliance with the covenants and restrictions under the new arrangements. Impact of the Chapter 11 Cases on Certain Leases The Company leases equipment and facilities under various noncancelable lease agreements. Certain lease agreements were subject to the restrictive covenants of the 2013 Credit Facility and include 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. In relation to the Company's non-debtor subsidiaries, the Company is in various stages of negotiating stand-still arrangements with some lessors where the lessor will not exercise those rights. The Company does not currently believe it is probable the lessors will exercise those rights for the non-debtor subsidiaries. The lessors' rights related to the Debtor subsidiaries were automatically stayed as a result of the filing of the Chapter 11 Cases. As of September 30, 2016, the Company had approximately $215 million of remaining commitments under these non-debtor lease arrangements.

Earnings per Share (EPS)

Earnings per Share (EPS)	9 Months Ended
	Sep. 30, 2016
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 restricted stock awards are considered participating securities because holders are entitled to receive non-forfeitable dividends during the vesting term. Diluted EPS includes securities that could potentially dilute basic EPS during a reporting period, for which the Company includes the Debentures and share-based compensation awards. 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 performance units, which are further described in Note 18. "Share-Based Compensation" in the Company's Annual Report on Form 10-K for the year ended December 31, 2015, 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 Company’s performance units, their contingent features result in an assessment for any potentially dilutive common stock by using the end of the reporting period as if it were the end of the contingency period for all units granted. For further discussion of the Company’s share-based compensation awards, see Note 18. "Share-Based Compensation" to the consolidated financial statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015 . A conversion of the Debentures may result in payment for any conversion value in excess of the principal amount of the Debentures in the Company’s common stock. For diluted EPS purposes, potential common stock is calculated based on whether the market price of the Company’s common stock at the end of each reporting period is in excess of the conversion price of the Debentures. For a full discussion of the conditions under which the Debentures may be converted, the conversion rate to common stock and the conversion price, see Note 12. "Long-term Debt" to the consolidated financial statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015 . 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 also excluded aggregate share-based compensation awards of approximately 0.4 million and 0.3 million for the three months ended September 30, 2016 and 2015 , respectively, and 0.4 million and 0.3 million for the nine months ended September 30, 2016 and 2015 , 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. The number of shares and per share amounts for all periods presented below have been retroactively restated to reflect the Reverse Stock Split discussed in Note 1. "Basis of Presentation." Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 (In millions, except per share data) EPS numerator: Loss from continuing operations, net of income taxes $ (95.6 ) $ (144.4 ) $ (488.1 ) $ (1,316.0 ) Less: Net income attributable to noncontrolling interests 1.8 2.8 3.5 7.9 Loss from continuing operations attributable to common stockholders, after allocation of earnings to participating securities (97.4 ) (147.2 ) (491.6 ) (1,323.9 ) Loss from discontinued operations attributable to common stockholders, after allocation of earnings to participating securities (38.1 ) (157.5 ) (44.5 ) (202.7 ) Net loss attributable to common stockholders, after earnings allocated to participating securities $ (135.5 ) $ (304.7 ) $ (536.1 ) $ (1,526.6 ) EPS denominator: Weighted average shares outstanding — basic and diluted 18.3 18.2 18.3 18.1 Basic and diluted EPS attributable to common stockholders: Loss from continuing operations $ (5.32 ) $ (8.08 ) $ (26.88 ) $ (73.05 ) Loss from discontinued operations (2.09 ) (8.65 ) (2.43 ) (11.18 ) Net loss attributable to common stockholders $ (7.41 ) $ (16.73 ) $ (29.31 ) $ (84.23 )

Financial Instruments, Guarante

Financial Instruments, Guarantees with Off-Balance-Sheet Risk and Other Guarantees	9 Months Ended
	Sep. 30, 2016
Financial Instruments And Guarantees With Off Balance Sheet Risk Disclosure [Abstract]
Financial Instruments and Guarantees with Off-Balance-Sheet Risk	Financial Instruments and Other Guarantees In the normal course of business, the Company is a party to guarantees and financial instruments with off-balance-sheet risk, most of which are not reflected in the accompanying condensed consolidated balance sheets. Such financial instruments are valued based on the amount of exposure under the instrument and the likelihood of required performance. As of September 30, 2016 , the Company had the following financial instruments and other guarantees: Reclamation Obligations Lease Obligations Workers’ Compensation Obligations Other (1) Total Letters of Credit and Cash Collateral in Support of Financial Instruments (Dollars in millions) Self-bonding $ 1,127.5 $ — $ — $ — $ 1,127.5 $ — Surety bonds 320.1 96.7 19.1 15.3 451.2 112.6 Bank guarantees 170.7 — — 26.1 196.8 202.4 Other letters of credit — — 52.0 104.5 156.5 — Total $ 1,618.3 $ 96.7 $ 71.1 $ 145.9 $ 1,932.0 $ 315.0 (1) Other includes the $37.0 million in letters of credit related to TXU Europe Limited described below and an additional $108.9 million in bank guarantees, letters of credit and surety bonds related to collateral for road maintenance, performance guarantees and other operations. The Company owns a 37.5% interest in Dominion Terminal Associates, a partnership that operates a coal export terminal in Newport News, Virginia under a 30 -year lease that permits the partnership to purchase the terminal at the end of the lease term for a nominal amount. The partners have severally (but not jointly) agreed to make payments under various agreements which, in the aggregate, provide the partnership with sufficient funds to pay rents and to cover the principal and interest payments on the floating-rate industrial revenue bonds issued by the Peninsula Ports Authority, and which are supported by letters of credit from a commercial bank. On July 1, 2016, $39.9 million of the total $42.7 million of letters of credit supporting the reimbursement obligation to the commercial bank were drawn down to repay the outstanding bonds. As a result, the bonds were retired with the balance of the letters of credit canceled. The Company is party to an agreement with the PBGC and TXU Europe Limited, an affiliate of the Company’s former parent corporation, under which the Company is required to make contributions to two of the Company’s qualified defined benefit pension plans and to maintain a $37.0 million letter of credit in favor of the PBGC. If the Company or the PBGC gives notice of an intent to terminate one or more of the covered pension plans in which liabilities are not fully funded, or if the Company fails to maintain the letter of credit, the PBGC may draw down on the letter of credit and use the proceeds to satisfy liabilities under the Employee Retirement Income Security Act of 1974, as amended. The PBGC, however, is required to first apply amounts received from a $110.0 million guarantee in place from TXU Europe Limited in favor of the PBGC before it draws on the Company’s letter of credit. On November 19, 2002, TXU Europe Limited was placed under the administration process in the U.K. (similar to a bankruptcy process) and continues under this process as of September 30, 2016 . As a result of these proceedings, TXU Europe Limited may be liquidated or otherwise reorganized in such a way as to relieve it of its obligations under its guarantee. Self-Bonding During August and September 2016, the Bankruptcy Court approved four motions for Stipulations and Orders (collectively, the “Stipulations”) regarding settlement agreements with the states of Wyoming, New Mexico, Indiana, and Illinois. The Stipulations provide the relevant state authorities with additional financial assurance for the Company’s performance of its reclamation obligations by entitling them to (i) claims in the Chapter 11 Cases that have priority over all administrative expenses of the kind specified in section 503(b) of the Bankruptcy Code for the specified values set forth in the Stipulations and (ii) in the cases of Wyoming, Indiana and Illinois, $0.8 million , $7.5 million and $3.2 million , respectively, in letters of credit or surety bonds related to closed mining operations, together not to exceed the full amount of the $200 million bonding accommodation facility provided for in the DIP Credit Agreement. Each state received financial assurances equal to approximately 17.5% of the Company's prepetition reclamation bond amount with the relevant state. In addition to providing supplemental financial assurances to these states, the Company has agreed to, among other things, quarterly reclamation activity status meetings as well as targeting reductions in the amount of bonds outstanding with these states. Pursuant to the Stipulations, the states will effectively deem the Company’s bonding requirements satisfied for the pendency of the Chapter 11 Cases. As previously disclosed, the Company's ability to self-bond reduces the Company's costs of securing reclamation obligations and enhances liquidity to the extent alternate forms of bonding would require the Company to post collateral. To the extent the Company is unable to maintain its current level of self-bonding following the conclusion of the Chapter 11 Cases for any reason, the Company would be required to obtain replacement financial assurances or security. Further, self-bonding is permitted at the discretion of each state. As of September 30, 2016, the Company was self-bonded in Illinois, Indiana, New Mexico and Wyoming. The Company is in discussions with Illinois, Indiana, New Mexico and Wyoming regarding the Company’s reclamation bonding over the long term. Accounts Receivable Securitization On March 25, 2016, the Company amended and restated its accounts receivable securitization program (securitization program) to, among other things, extend the term of the program by two years to March 23, 2018 and reduce the maximum availability under the facility from $275.0 million to $180.0 million . The accessible capacity of the program varies daily, dependent upon the actual amount of receivables available for contribution and various reserves and limits. As of September 30, 2016 , $22.8 million was deposited in a collateral account to secure obligations under the facility. Under the securitization program, the Company contributes the trade receivables of most of its U.S. subsidiaries on a revolving basis to its wholly-owned, bankruptcy-remote subsidiary (Seller), which then sells the receivables in their entirety to unaffiliated asset-backed commercial paper conduits and banks (the Conduits). After the sale, the Company, as servicer of the assets, collects the receivables on behalf of the Conduits for a nominal servicing fee. The Seller is a separate legal entity whose assets are available first and foremost to satisfy the claims of its creditors. Of the receivables sold to the Conduits, a portion of the amount due to the Seller is deferred until the ultimate collection of the underlying receivables. During the nine months ended September 30, 2016 , the Company received total consideration of $2,109.6 million related to accounts receivable sold under the securitization program, including $1,102.6 million of cash up front from the sale of the receivables, an additional $836.4 million of cash upon the collection of the underlying receivables and $170.6 million that had not been collected at September 30, 2016 and was recorded at carrying value, which approximates fair value. The reduction in accounts receivable as a result of securitization activity with the Conduits was zero and $168.5 million at September 30, 2016 and December 31, 2015 , respectively. As of September 30, 2016, $144.9 million in letters of credit remained outstanding under the securitization program. The securitization activity has been reflected in the unaudited condensed consolidated statements of cash flows as an operating activity because both the cash received from the Conduits upon sale of the receivables as well as the cash received from the Conduits upon the ultimate collection of the receivables are not subject to significantly different risks given the short-term nature of the Company’s trade receivables. The Company recorded expense associated with securitization transactions of $2.4 million and $0.5 million for the three months ended September 30, 2016 and 2015 , and $5.6 million and $1.3 million for the nine months ended September 30, 2016 and 2015 , respectively. During the second quarter of 2016, the Company executed two additional amendments to the March 25, 2016 agreement. These amendments permit the continuation of the securitization program through the Company’s Chapter 11 Cases. On April 12, 2016, the Company entered into an amendment to its securitization program to state that the filing of the Bankruptcy Petitions would not result in an automatic termination of the securitization program that would result in the acceleration of the obligations thereunder. On the Petition Date, the Debtors filed a motion seeking Bankruptcy Court approval of the continuation of the securitization program on the terms set forth in the amendments. On April 15, 2016, the Bankruptcy Court entered an order approving this motion on an interim basis. On April 18, 2016, the Company entered into an additional amendment to its securitization program to (i) change the maturity date to the earlier of March 23, 2018 and the emergence of the Company from the Chapter 11 Cases, (ii) revise the schedule of fees and (iii) enter into an additional performance guarantee by the Company’s subsidiaries that are contributors under the securitization facility promising to fulfill obligations of the other contributors. On May 17, 2016, the Bankruptcy Court approved the securitization program on a final basis and entered an order to that effect on May 18, 2016. Other Included in "Liabilities subject to compromise" and "Other noncurrent liabilities", respectively, in the Company's condensed consolidated balance sheets as of September 30, 2016 and December 31, 2015 is a liability of $38.4 million related to certain commitments provided on behalf of a third-party coal producer associated with a 2007 purchase of coal reserves and surface lands in the Illinois Basin. 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, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Commitments Unconditional Purchase Obligations As of September 30, 2016 , purchase commitments for capital expenditures were $12.6 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 24 to the consolidated financial statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015 . 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. Each of the Debtors continues 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, unless and until the Bankruptcy Court modifies or lifts the automatic stay as to any such claim. Notwithstanding the general application of the automatic stay described above, governmental authorities may determine to continue actions brought under their police and regulatory powers. The Debtors have filed notices of the bankruptcy filings and suggestions of stay in the applicable domestic matters involving one or more of the Debtors as discussed below and in Note 20. "Matters Related to the Bankruptcy of Patriot Coal Corporation". It is currently unclear whether or how the Company’s Chapter 11 Cases will affect the liabilities described below and in Note 20 or any other contingent liabilities the Debtors may have. 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, then 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. Based on the Company's evaluation of the issues and their potential impact, the amount of any future loss cannot be reasonably estimated. Queensland Bulk Handling Pty Ltd. On June 30, 2014, QBH filed a statement of claim with the Supreme Court of Queensland, Australia, against Peabody (Wilkie Creek) Pty Limited, an indirect wholly-owned subsidiary of the Company, alleging breach of a CPSA between the parties. QBH originally sought damages of $113.1 million Australian dollars, plus interest and costs. However, it later altered its claim to seek a declaration that the Company subsidiary had exercised an option to renew the contract for a further term, and withdrew its claim for money damages. On February 27, 2015, the Supreme Court of Queensland, Australia ruled that QBH and the Company subsidiary were bound to enter into a new CPSA upon substantially the same terms as the 2009 CPSA between them. Under the 2009 CPSA, QBH provided services to Peabody (Wilkie Creek) Pty Limited for operations at the Wilkie Creek Mine, which was closed in 2013. The term of the potential new CPSA would commence January 1, 2015 and expire on December 31, 2026 and, assuming substantially the same contractual terms, would require annual minimum payments of approximately $11.8 million Australian dollars. The Company subsidiary appealed this ruling, which was heard by the Court of Appeal on July 30, 2015. On October 23, 2015, the appellate court upheld this ruling and dismissed the appeal. The Company subsidiary was ordered to pay QBH’s costs of the appeal. In February 2016, QBH served costs statements on the Company subsidiary for attorneys' fees for the appeal and trial and the Company subsidiary is in the process of objecting to the amount of those costs. On December 8, 2015, QBH filed a claim in the Supreme Court of Queensland, Australia seeking specific performance of the Company subsidiary’s obligation to enter into a new CPSA as described above and payment of $11.8 million Australian dollars representing amounts invoiced by QBH from January through November 2015, plus additional amounts for interest and attorney fees. On January 29, 2016, the Company subsidiary filed a defense to these claims. On February 15, 2016, QBH filed an application for summary judgment, which QBH subsequently agreed to adjourn to a date to be fixed, seeking an order requiring the Company subsidiary to execute a new CPSA and seeking additional amounts invoiced by QBH through February 2016, plus additional interest on these amounts and attorney fees. On February 29, 2016 QBH filed an amended statement of claim. The Company subsidiary filed a defense to the amended statement of claim on March 22, 2016. QBH filed an amended statement of claim in answer to the Company’s amended defense on April 12, 2016. The only change by QBH was to plead that if the Company is correct in its claim that the CPSA was repudiated by the Company and validly terminated by QBH’s acceptance of that repudiation, then QBH claims damages in the alternative. The Company filed an amended defense on May 3, 2016. On May 25, 2016, QBH filed a reply and answer to the Company subsidiary’s amended defense. As the ultimate impact of the litigation was subject to a wide range of uncertainty, the Company recognized a charge of $9.7 million to discontinued operations during 2015, of which $7.6 million was recorded in the nine months ended September 30, 2015. In September 2016, a settlement was reached under which the Company agreed to pay $13.0 million Australian dollars ( $9.9 million USD) to QBH in a full and final settlement of all claims each party had against the other in relation to the CPSA litigation. A deed of settlement was executed by the parties and the settlement amount was paid to QBH on September 30, 2016. 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), Peabody Holding Company, LLC (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 the Employee Retirement Income Security Act of 1974 (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 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 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. CNTA Dispute. On May 20, 2016, the Company filed a complaint and a request for declaratory judgment in the Bankruptcy Court against Citibank, N.A. (in its capacity as Administrative Agent under the Company’s 2013 Credit Facility), among others, regarding the extent of certain collateral and secured claims of certain prepetition creditors. On June 13, 2016, Citibank, N.A. filed an answer and counter-claim for declaratory judgment. On June 14, 2016, two motions to intervene were filed, one from the Creditors' Committee and another from a group of creditors holding $1.65 billion in face value of the Company's Senior Notes (as indicated in their motion). On June 20, 2016, the Bankruptcy Court entered an order granting the Debtors' motion requesting that the Bankruptcy Court direct all parties to the proceeding to participate in non-binding mediation. The intervention motions were granted on July 7, 2016. On October 7, 2016, a group of creditors holding approximately $287.4 million in face value of the Company’s Senior Secured Second Lien Notes (as indicated in their motion) filed a motion to intervene. The Bankruptcy Court heard oral arguments related to the parties’ motions for summary judgment on September 12, 2016 and subsequently vacated the previously scheduled trial dates and deferred ruling on the matter while the parties continue with mediation. The result of the CNTA Dispute could impact respective recoveries for secured and unsecured creditors in the Chapter 11 Cases. APS/PacifiCorp Litigation. The Arizona Public Service Company (APS) and PacifiCorp filed a motion in the Bankruptcy Court seeking authorization to allow it to terminate a coal sales agreement, which accounts for approximately half of the Company's El Segundo Mine sales volume. The Company filed a complaint for APS’s and PacifiCorp’s violation of the automatic stay applicable to the Chapter 11 Cases and breach of the coal sales agreement. In September 2016, the parties engaged in a court-ordered mediation. On November 2, the Bankruptcy Court entered an order scheduling the matter for trial beginning on February 13, 2017. The Company intends to vigorously pursue its rights under the coal sales agreement, and against APS/PacifiCorp for the violations of the automatic stay and the coal sales agreement. 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 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 has accrued as of September 30, 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. The Company believes it is not probable that the Commission will approve access to the secondary deposits based on the Company's view of a lack of economic feasibility and certain restrictions on Berenergy's legal claim to the deposits. The Company is also evaluating the impact of the automatic stay resulting from the Chapter 11 Cases on this matter, which could potentially prevent the Wyoming Court from enforcing its ruling. Based upon these factors, the Company has not accrued a liability related to the secondary deposits as of September 30, 2016. On October 21, 2016, Berenergy filed a motion to lift the automatic stay to allow it to appeal the October 13, 2016 Wyoming Court judgment. 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 had no ongoing operations and PEC had no prior involvement in the past operations of Gold Fields. Gold Fields is currently one of PEC's subsidiaries. As part of separate transactions, both PEC and Gold Fields also 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 has tendered its environmental claims for remediation, past cost 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 has now stopped paying these remediation costs. Environmental assessments for remediation, past and future costs, and/or natural resource damages also have been asserted by the 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 has 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, are collectively estimated to be $62.9 million and $66.9 million as of September 30, 2016 and December 31, 2015, respectively, in the condensed consolidated balance sheets. The majority of these estimated costs relate 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 alleged estimated 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 . PEC and Gold Fields plan to contest these claims which they believe to significantly overstate any liabilities that may exist for remediation costs or potential NRDs. 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 total in excess of $2.7 billion and allege 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 are duplicative as they overlap with each other as well as with claims made by Blue Tee. Additionally, PEC and Gold Fields believe the claims significantly overstate any liabilities that may exist for remediation costs or potential NRDs and will contest the claims. The ultimate impact of these matters is subject to a wide range of uncertainties and the Company cannot reasonably estimate its exposure at this time. 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.

Matters Related to the Bankrupt

Matters Related to the Bankruptcy of Patriot Coal Corporation (Patriot) (Notes)	9 Months Ended
	Sep. 30, 2016
Matters Related to the Bankruptcy of Patriot Coal Corporation (Patriot) [Abstract]
Matters Related to the Bankruptcy of Patriot Coal Corporation (Patriot) [Table Text Block]	Matters Related to the Bankruptcy of Patriot Coal Corporation In 2012, Patriot filed voluntary petitions for relief under Chapter 11 of the Bankruptcy 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. Credit Support As part of the 2013 Agreement, the Company provided certain credit support to Patriot. The Company has recorded $20.9 million of credit support provided to Patriot as a liability on the Company's condensed consolidated balance sheet as of September 30, 2016 , of which $15.7 million was supported by letters of credit. 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 definitive settlement agreement reached in 2013 included Patriot’s affirmance of indemnities provided in the spin-off agreements, including the indemnity relating to such black lung liabilities. 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 at September 30, 2016 was $132.9 million . While the Company has recorded a 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 estimates that the annual cash cost to fund these potential Black Lung liabilities will range between $10 million and $15 million . UMWA VEBA Payments 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. Those payments included an initial payment of $90.0 million made in January 2014, comprised of $70.0 million paid to Patriot and $20.0 million paid to the VEBA, and a payment of $75.0 million made in January 2015 to the VEBA. The settlement agreement also contemplated subsequent payments to be made to the VEBA of $75.0 million in 2016 and $70.0 million in 2017. The parties agreed to a settlement of the Company’s obligations for payment of the remaining VEBA payments (2016 Settlement Agreement), which was approved by the Missouri Bankruptcy Court on January 5, 2016 and the Virginia Bankruptcy Court on January 6, 2016. Under this settlement, the Company agreed to pay $75 million to the VEBA, payable in equal monthly installments of $7.5 million beginning on January 4, 2016. The remaining monthly installments are due at the beginning of each successive month ending October 2016, and the obligations are supported in full by a letter of credit. As a result of the Company’s Chapter 11 Cases, the Company’s obligations to the VEBA under the 2016 Settlement Agreement are being satisfied by monthly draws on the letter of credit by the VEBA trustees. These monthly VEBA payments will terminate early if the VEBA participants can receive healthcare benefits that are reasonably similar to or greater than healthcare benefits provided under the VEBA as a result of new legislation. As part 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. 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, PHC, a subsidiary of the Company, and Arch Coal, Inc. (Arch). The plaintiffs sought, pursuant to 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. The plaintiffs' lawsuit claimed that the defendants' withdrawal liability would result in at least $767 million owed to the UMWA Plan. PEC and PHC agreed that arbitration was the proper mechanism to dispute any withdrawal liability. Accordingly, the plaintiffs moved to dismiss the lawsuit against PEC and PHC without prejudice and the court granted the motion. On October 29, 2015, the Trustees of the UMWA Plan issued a withdrawal liability assessment against PEC and PHC in the amount of $644.2 million (October 29 Assessment) on the theory that a principal purpose of the Company’s 2007 spin-off of Patriot was to “evade or avoid” withdrawal liability to the UMWA Plan. The Trustees allege that the Company is therefore liable for Patriot's withdrawal liability due to Patriot terminating certain collective bargaining agreements with the UMWA eight years after the spin-off during Patriot's bankruptcy proceeding. PEC and PHC dispute that the Patriot spin-off was an attempt to evade or avoid any obligation to the UMWA Plan. Since more than five years have elapsed since the spin-off of Patriot, the law exempts the Company from making any payments toward the October 29 Assessment unless and until an arbitrator issues a final decision in favor of the Trustees on the "evade or avoid" theory of liability. ERISA provides a process to adjudicate withdrawal liability disputes, which consists of administrative review by the UMWA Plan followed by arbitration, after which either side can appeal to the appropriate United States district court. PEC and PHC initiated the administrative review process with the UMWA Plan on January 26, 2016 and the UMWA Plan denied the request on March 18, 2016. The UMWA Plan initiated arbitration with the AAA on April 7, 2016 (Pension Arbitration). The filing of the Bankruptcy Petitions on April 13, 2016 automatically stayed the Pension Arbitration. On August 15, 2016, the UMWA Plan filed a claim in the Bankruptcy Court against the Debtors related to the October 29 Assessment in the amount of $642.7 million . On September 8, 2016, the Debtors filed an objection to the claim in the Bankruptcy Court. In the objection, the Debtors argued that they are not liable to the UMWA Plan and asked the Bankruptcy Court to disallow the claim in its entirety. On September 26, 2016, the UMWA Plan filed a motion to lift the automatic stay to allow the UMWA Plan’s claim to be adjudicated through arbitration, not the claims administration process outlined by the Bankruptcy Code, as articulated in the Stipulation (Lift-Stay Motion). On October 11, 2016, the Debtors objected to the Lift-Stay Motion on the grounds that the UMWA Plan had not established sufficient cause to lift the automatic stay. A hearing on the Lift-Stay Motion was held on October 18, 2016, and the Bankruptcy Court granted limited relief from the automatic stay until October 28, 2016 to provide the UMWA Plan until October 28, 2016, to receive a written confirmation from the AAA that the AAA could find an arbitrator with sufficient experience who could arbitrate the UMWA Plan's claim and reach a decision, without extension or any exception for cause, by January 26, 2017. On October 25, 2016, the UMWA Plan filed a copy of its correspondence with the AAA and on October 26, 2016, the Bankruptcy Court issued an order lifting the automatic stay to allow arbitration of the claim to proceed. The parties have selected an arbitrator, and the arbitration hearings are scheduled to begin on December 19, 2016. During the three months ended September 30, 2016, the Company recognized a charge of $35.0 million , consisting of a $10.0 million cash liability and an allowed unsecured claim of $25.0 million , to "Loss from discontinued operations, net of income taxes" in the unaudited condensed consolidated statement of operations as an estimate of the low end of the range of loss. The top end of the range of reasonably possible loss is $642.7 million , which, as noted above, is the total value of the UMWA Plan's claim.

Reorganization Items, Net (Note

Reorganization Items, Net (Notes)	9 Months Ended
	Sep. 30, 2016
Reorganization Items, Net [Abstract]
Reorganization Items, Net [Text Block]	Reorganization Items, Net In accordance with Accounting Standards Codification 852, "Reorganizations," the statement of operations shall portray the results of operations of the reporting entity during the pendency of the Chapter 11 Cases. Revenues, expenses (including professional fees), realized gains and losses, and provisions for losses resulting from reorganization and restructuring of the business shall be reported separately as reorganization items. The Company's reorganization items for the three and nine months ended September 30, 2016 consisted of the following: Three Months Ended Nine Months Ended September 30, 2016 September 30, 2016 (Dollars in millions) Loss on termination of derivative contracts $ — $ 75.2 Professional fees 31.1 52.7 Accounts payable settlement gains (0.5 ) (0.7 ) Interest income (0.9 ) (1.1 ) Other — (1.0 ) Reorganization items, net $ 29.7 $ 125.1 As a result of filing the Bankruptcy Petitions, counterparties to certain derivative contracts terminated the agreements shortly thereafter in accordance with their contractual terms and the Company adjusted the corresponding liabilities to be equivalent to the termination value and allowed claim amount, of each contract. Such liabilities are considered first lien debt and are included within "Liabilities subject to compromise" in the accompanying condensed consolidated balance sheet at September 30, 2016 . Professional fees are only those that are directly related to the reorganization including, but not limited to, fees associated with advisors to the Debtors, the Creditors' Committee and certain secured and unsecured creditors. During the nine months ended September 30, 2016 , $30.7 million of cash payments were made for "Reorganization items, net".

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2016
Segment Reporting [Abstract]
Segment Information	Segment Information The Company reports its results of operations primarily 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 uses Adjusted EBITDA as the primary metric to measure the segments' operating performance. Adjusted EBITDA is defined as (loss) income from continuing operations before deducting net interest expense, income taxes, asset retirement obligation expense, depreciation, depletion and amortization and reorganization items, net. Adjusted EBITDA is also adjusted for the discrete items, which are reflected in the reconciliation below, that management excluded in analyzing the segment's operating performance. Adjusted EBITDA is not intended to serve as an alternative to U.S. GAAP measures of performance and may not be comparable to similarly-titled measures presented by other companies. Reportable segment results were as follows: Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 (Dollars in millions) Revenues: Powder River Basin Mining $ 419.6 $ 475.0 $ 1,062.2 $ 1,393.9 Midwestern U.S. Mining 211.0 249.4 599.6 768.2 Western U.S. Mining 162.4 177.3 387.0 526.9 Australian Metallurgical Mining 232.5 280.4 682.8 924.6 Australian Thermal Mining 197.9 205.3 561.4 615.2 Trading and Brokerage (19.2 ) 24.5 (32.6 ) 42.7 Corporate and Other 2.9 7.0 14.1 24.6 Total $ 1,207.1 $ 1,418.9 $ 3,274.5 $ 4,296.1 Adjusted EBITDA: Powder River Basin Mining $ 123.9 $ 120.0 $ 278.3 $ 354.7 Midwestern U.S. Mining 59.1 72.3 172.4 218.6 Western U.S. Mining 34.3 45.7 83.2 147.7 Australian Metallurgical Mining (34.5 ) (15.4 ) (121.0 ) (2.2 ) Australian Thermal Mining 48.9 49.4 137.2 153.9 Trading and Brokerage (31.3 ) 29.4 (90.4 ) 30.4 Corporate and Other (1) (92.1 ) (172.4 ) (270.8 ) (521.5 ) Total $ 108.3 $ 129.0 $ 188.9 $ 381.6 (1) Includes a gain of $68.1 million during the nine months ended September 30, 2016 related to the 2016 Settlement Agreement described in Note 20 "Matters related to the Bankruptcy of Patriot Coal Corporation" A reconciliation of Adjusted EBITDA to consolidated loss from continuing operations, net of income taxes follows: Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 (Dollars in millions) Total Adjusted EBITDA $ 108.3 $ 129.0 $ 188.9 $ 381.6 Depreciation, depletion and amortization (117.8 ) (136.0 ) (345.5 ) (430.6 ) Asset impairment — — (17.2 ) (900.8 ) Asset retirement obligation expenses (12.7 ) (12.3 ) (37.3 ) (40.4 ) Selling and administrative expenses related to debt restructuring — — (21.5 ) — Change in deferred tax asset valuation allowance related to equity affiliates 0.6 (0.4 ) 0.6 0.4 Amortization of basis difference related to equity affiliates — (0.7 ) — (4.2 ) Interest expense (58.5 ) (118.5 ) (243.7 ) (344.0 ) Loss on early debt extinguishment — — — (67.8 ) Interest income 1.3 1.4 4.0 6.6 Reorganization items, net (29.7 ) — (125.1 ) — Income tax benefit (provision) 12.9 (6.9 ) 108.7 83.2 Loss from continuing operations, net of income taxes $ (95.6 ) $ (144.4 ) $ (488.1 ) $ (1,316.0 )

Supplemental Guarantor_Non-Guar

Supplemental Guarantor/Non-Guarantor Financial Information	9 Months Ended
	Sep. 30, 2016
Supplemental Consolidated Balance Sheets [Table Text Block]	Unaudited Supplemental Condensed Consolidating Balance Sheets September 30, 2016 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Reclassifications/ Eliminations Consolidated (Dollars in millions) Assets Current assets Cash and cash equivalents $ 687.5 $ 3.1 $ 477.2 $ — $ 1,167.8 Restricted cash 1.4 — 22.8 — 24.2 Accounts receivable, net — 22.4 329.5 — 351.9 Receivables from affiliates, net 1,035.2 — 633.4 (1,668.6 ) — Inventories — 86.7 172.9 — 259.6 Assets from coal trading activities, net — 0.1 19.8 — 19.9 Deferred income taxes — 65.3 — (11.8 ) 53.5 Other current assets 22.1 107.9 238.9 — 368.9 Total current assets 1,746.2 285.5 1,894.5 (1,680.4 ) 2,245.8 Property, plant, equipment and mine development, net — 4,419.3 4,796.2 — 9,215.5 Deferred income taxes — 63.2 2.3 (63.2 ) 2.3 Investments and other assets 8,761.5 3.7 501.1 (8,494.7 ) 771.6 Notes receivable from affiliates, net — 877.0 155.6 (1,032.6 ) — Total assets $ 10,507.7 $ 5,648.7 $ 7,349.7 $ (11,270.9 ) $ 12,235.2 Liabilities and Stockholders’ Equity Current liabilities Current portion of long-term debt $ 470.5 $ 20.5 $ 2.1 $ — $ 493.1 Payables to affiliates, net — 1,668.6 — (1,668.6 ) — Deferred income taxes 11.8 — 4.1 (11.8 ) 4.1 Liabilities from coal trading activities, net — 0.1 19.4 — 19.5 Accounts payable and accrued expenses 47.5 380.6 403.7 — 831.8 Total current liabilities 529.8 2,069.8 429.3 (1,680.4 ) 1,348.5 Deferred income taxes 165.8 — 5.0 (63.2 ) 107.6 Notes payable to affiliates, net 1,032.6 — — (1,032.6 ) — Other noncurrent liabilities 154.8 1,277.7 491.1 — 1,923.6 Total liabilities not subject to compromise 1,883.0 3,347.5 925.4 (2,776.2 ) 3,379.7 Liabilities subject to compromise 8,104.0 209.0 18.6 — 8,331.6 Total liabilities 9,987.0 3,556.5 944.0 (2,776.2 ) 11,711.3 Peabody Energy Corporation stockholders’ equity 520.7 2,092.2 6,402.5 (8,494.7 ) 520.7 Noncontrolling interests — — 3.2 — 3.2 Total stockholders’ equity 520.7 2,092.2 6,405.7 (8,494.7 ) 523.9 Total liabilities and stockholders’ equity $ 10,507.7 $ 5,648.7 $ 7,349.7 $ (11,270.9 ) $ 12,235.2 Unaudited Supplemental Condensed Consolidating Balance Sheets December 31, 2015 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Reclassifications/ Eliminations Consolidated (Dollars in millions) Assets Current assets Cash and cash equivalents $ 7.2 $ 4.7 $ 249.4 $ — $ 261.3 Accounts receivable, net — 12.1 216.7 — 228.8 Receivables from affiliates, net 582.1 — 948.1 (1,530.2 ) — Inventories — 109.4 198.4 — 307.8 Assets from coal trading activities, net — 3.2 20.3 — 23.5 Deferred income taxes — 65.3 — (11.8 ) 53.5 Other current assets 23.1 128.1 296.4 — 447.6 Total current assets 612.4 322.8 1,929.3 (1,542.0 ) 1,322.5 Property, plant, equipment and mine development, net — 4,304.8 4,953.7 — 9,258.5 Deferred income taxes — 33.1 — (30.9 ) 2.2 Investments and other assets 8,476.2 3.6 185.5 (8,301.6 ) 363.7 Notes receivable from affiliates, net — 632.7 399.9 (1,032.6 ) — Total assets $ 9,088.6 $ 5,297.0 $ 7,468.4 $ (10,907.1 ) $ 10,946.9 Liabilities and Stockholders’ Equity Current liabilities Current portion of long-term debt $ 5,844.0 $ 23.8 $ 7.1 $ — $ 5,874.9 Payables to affiliates, net — 1,530.2 — (1,530.2 ) — Deferred income taxes 11.8 — 3.8 (11.8 ) 3.8 Liabilities from coal trading activities, net — 4.8 10.8 — 15.6 Accounts payable and accrued expenses 494.8 479.8 467.9 — 1,442.5 Total current liabilities 6,350.6 2,038.6 489.6 (1,542.0 ) 7,336.8 Long-term debt, less current portion 366.3 — — — 366.3 Deferred income taxes 98.6 — 1.4 (30.9 ) 69.1 Notes payable to affiliates, net 1,032.6 — — (1,032.6 ) — Other noncurrent liabilities 323.6 1,454.9 477.7 — 2,256.2 Total liabilities 8,171.7 3,493.5 968.7 (2,605.5 ) 10,028.4 Peabody Energy Corporation stockholders’ equity 916.9 1,803.5 6,498.1 (8,301.6 ) 916.9 Noncontrolling interests — — 1.6 — 1.6 Total stockholders’ equity 916.9 1,803.5 6,499.7 (8,301.6 ) 918.5 Total liabilities and stockholders’ equity $ 9,088.6 $ 5,297.0 $ 7,468.4 $ (10,907.1 ) $ 10,946.9 Unaudited Supplemental Condensed Consolidating Balance Sheets September 30, 2016 Debtors Non-Debtors Reclassifications/Eliminations Consolidated (Dollars in millions) Assets Current assets Cash and cash equivalents $ 702.1 $ 465.7 $ — $ 1,167.8 Restricted cash 1.4 22.8 — 24.2 Accounts receivable, net 22.5 329.4 — 351.9 Receivables from affiliates, net 387.4 — (387.4 ) — Inventories 118.4 141.2 — 259.6 Assets from coal trading activities, net 0.1 19.8 — 19.9 Deferred income taxes 53.4 0.1 — 53.5 Other current assets 130.1 238.8 — 368.9 Total current assets 1,415.4 1,217.8 (387.4 ) 2,245.8 Property, plant, equipment and mine development, net 4,906.1 4,309.4 — 9,215.5 Deferred income taxes — 2.3 — 2.3 Investments and other assets 4,307.9 471.0 (4,007.3 ) 771.6 Notes receivable from affiliates, net 877.0 — (877.0 ) — Total assets $ 11,506.4 $ 6,000.5 $ (5,271.7 ) $ 12,235.2 Liabilities and Stockholders’ Equity Current liabilities Current portion of long-term debt $ 491.0 $ 2.1 $ — $ 493.1 Payables to affiliates, net — 387.4 (387.4 ) — Liabilities from coal trading activities, net 0.1 19.4 — 19.5 Accounts payable and accrued expenses 463.0 372.9 — 835.9 Total current liabilities 954.1 781.8 (387.4 ) 1,348.5 Deferred income taxes 102.7 4.9 — 107.6 Notes payable to affiliates, net — 877.0 (877.0 ) — Other noncurrent liabilities 1,597.3 326.3 — 1,923.6 Total liabilities not subject to compromise 2,654.1 1,990.0 (1,264.4 ) 3,379.7 Liabilities subject to compromise 8,331.6 — — 8,331.6 Total liabilities 10,985.7 1,990.0 (1,264.4 ) 11,711.3 Peabody Energy Corporation stockholders’ equity 520.7 4,007.3 (4,007.3 ) 520.7 Noncontrolling interests — 3.2 — 3.2 Total stockholders’ equity 520.7 4,010.5 (4,007.3 ) 523.9 Total liabilities and stockholders’ equity $ 11,506.4 $ 6,000.5 $ (5,271.7 ) $ 12,235.2
Supplemental Consolidated Statements Of Operations [Table Text Block]	Unaudited Supplemental Condensed Consolidating Statements of Operations Three Months Ended September 30, 2016 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated (Dollars in millions) Total revenues $ — $ 800.7 $ 497.0 $ (90.6 ) $ 1,207.1 Costs and expenses Operating costs and expenses (exclusive of items shown separately below) 47.4 598.7 509.3 (90.6 ) 1,064.8 Depreciation, depletion and amortization — 55.9 61.9 — 117.8 Asset retirement obligation expenses — 5.4 7.3 — 12.7 Selling and administrative expenses 3.7 23.4 5.0 — 32.1 Restructuring charges — 0.1 0.2 — 0.3 Other operating (income) loss: Net gain on disposal of assets — (1.8 ) (0.1 ) — (1.9 ) (Income) loss from equity affiliates and investment in subsidiaries (14.0 ) 0.7 2.2 14.0 2.9 Interest expense 56.1 4.7 6.5 (8.8 ) 58.5 Interest income — (1.2 ) (8.9 ) 8.8 (1.3 ) Reorganization items, net (0.8 ) 29.7 0.8 — 29.7 (Loss) income from continuing operations before income taxes (92.4 ) 85.1 (87.2 ) (14.0 ) (108.5 ) Income tax provision (benefit) 6.2 (23.7 ) 4.6 — (12.9 ) (Loss) income from continuing operations, net of income taxes (98.6 ) 108.8 (91.8 ) (14.0 ) (95.6 ) Loss from discontinued operations, net of income taxes (36.9 ) (0.3 ) (0.9 ) — (38.1 ) Net (loss) income (135.5 ) 108.5 (92.7 ) (14.0 ) (133.7 ) Less: Net income attributable to noncontrolling interests — — 1.8 — 1.8 Net (loss) income attributable to common stockholders $ (135.5 ) $ 108.5 $ (94.5 ) $ (14.0 ) $ (135.5 ) Unaudited Supplemental Condensed Consolidating Statements of Operations Nine Months Ended September 30, 2016 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated (Dollars in millions) Total revenues $ — $ 2,087.2 $ 1,421.6 $ (234.3 ) $ 3,274.5 Costs and expenses Operating costs and expenses (exclusive of items shown separately below) 129.7 1,597.3 1,488.5 (234.3 ) 2,981.2 Depreciation, depletion and amortization — 157.6 187.9 — 345.5 Asset retirement obligation expenses — 17.3 20.0 — 37.3 Selling and administrative expenses 8.8 95.8 10.0 — 114.6 Restructuring charges — 11.9 3.6 — 15.5 Other operating (income) loss: Net gain on disposal of assets — (14.5 ) (2.9 ) — (17.4 ) Asset impairment — — 17.2 — 17.2 Loss from equity affiliates and investment in subsidiaries 89.8 2.8 9.8 (89.8 ) 12.6 Interest expense 234.5 15.1 19.3 (25.2 ) 243.7 Interest income (0.2 ) (3.2 ) (25.8 ) 25.2 (4.0 ) Reorganization items, net 74.1 47.8 3.2 — 125.1 (Loss) income from continuing operations before income taxes (536.7 ) 159.3 (309.2 ) 89.8 (596.8 ) Income tax (benefit) provision (41.8 ) (70.5 ) 3.6 — (108.7 ) (Loss) income from continuing operations, net of income taxes (494.9 ) 229.8 (312.8 ) 89.8 (488.1 ) Loss from discontinued operations, net of income taxes (41.2 ) (1.4 ) (1.9 ) — (44.5 ) Net (loss) income (536.1 ) 228.4 (314.7 ) 89.8 (532.6 ) Less: Net income attributable to noncontrolling interests — — 3.5 — 3.5 Net (loss) income attributable to common stockholders $ (536.1 ) $ 228.4 $ (318.2 ) $ 89.8 $ (536.1 ) Unaudited Supplemental Condensed Consolidating Statements of Operations Three Months Ended September 30, 2015 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated (Dollars in millions) Total revenues $ — $ 902.4 $ 640.4 $ (123.9 ) $ 1,418.9 Costs and expenses Operating costs and expenses (exclusive of items shown separately below) 116.8 710.6 550.5 (123.9 ) 1,254.0 Depreciation, depletion and amortization — 62.0 74.0 — 136.0 Asset retirement obligation expenses — 4.2 8.1 — 12.3 Selling and administrative expenses 6.5 28.6 2.7 — 37.8 Restructuring charges — 0.8 1.0 — 1.8 Other operating loss (income): Net loss (gain) on disposal of assets 0.1 (6.6 ) (1.4 ) — (7.9 ) (Income) loss from equity affiliates and investment in subsidiaries (100.7 ) 1.8 3.5 100.7 5.3 Interest expense 120.4 4.4 2.4 (8.7 ) 118.5 Interest income (0.1 ) (0.5 ) (9.5 ) 8.7 (1.4 ) (Loss) income from continuing operations before income taxes (143.0 ) 97.1 9.1 (100.7 ) (137.5 ) Income tax provision 4.6 1.8 0.5 — 6.9 (Loss) income from continuing operations, net of income taxes (147.6 ) 95.3 8.6 (100.7 ) (144.4 ) Loss from discontinued operations, net of income taxes (157.1 ) (0.3 ) (0.1 ) — (157.5 ) Net (loss) income (304.7 ) 95.0 8.5 (100.7 ) (301.9 ) Less: Net (loss) income attributable to noncontrolling interests — (0.2 ) 3.0 — 2.8 Net (loss) income attributable to common stockholders $ (304.7 ) $ 95.2 $ 5.5 $ (100.7 ) $ (304.7 ) Unaudited Supplemental Condensed Consolidating Statements of Operations Nine Months Ended September 30, 2015 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated (Dollars in millions) Total revenues $ — $ 2,699.7 $ 1,951.1 $ (354.7 ) $ 4,296.1 Costs and expenses Operating costs and expenses (exclusive of items shown separately below) 326.9 2,109.8 1,692.4 (354.7 ) 3,774.4 Depreciation, depletion and amortization — 189.2 241.4 — 430.6 Asset retirement obligation expenses — 13.9 26.5 — 40.4 Selling and administrative expenses 24.3 95.3 9.2 — 128.8 Restructuring charges (3.9 ) 11.0 15.9 — 23.0 Other operating (income) loss: Net gain on disposal of assets (2.3 ) (16.9 ) (1.0 ) — (20.2 ) Asset impairment — 182.2 718.6 — 900.8 Loss from equity affiliates and investment in subsidiaries 594.9 4.7 7.6 (594.9 ) 12.3 Interest expense 348.3 13.5 7.9 (25.7 ) 344.0 Loss on early debt extinguishment 67.8 — — — 67.8 Interest income (0.5 ) (1.8 ) (30.0 ) 25.7 (6.6 ) (Loss) income from continuing operations before income taxes (1,355.5 ) 98.8 (737.4 ) 594.9 (1,399.2 ) Income tax (benefit) provision (20.6 ) (63.0 ) 0.4 — (83.2 ) (Loss) income from continuing operations, net of income taxes (1,334.9 ) 161.8 (737.8 ) 594.9 (1,316.0 ) Loss from discontinued operations, net of income taxes (191.7 ) (2.2 ) (8.8 ) — (202.7 ) Net (loss) income (1,526.6 ) 159.6 (746.6 ) 594.9 (1,518.7 ) Less: Net income attributable to noncontrolling interests — 0.5 7.4 — 7.9 Net (loss) income attributable to common stockholders $ (1,526.6 ) $ 159.1 $ (754.0 ) $ 594.9 $ (1,526.6 ) The Period April 13 through September 30, 2016 Debtors Non-Debtors Eliminations Consolidated (Dollars in millions) Total revenues $ 1,331.3 $ 795.2 $ (2.6 ) $ 2,123.9 Costs and expenses Operating costs and expenses (exclusive of items shown separately below) 1,069.1 843.0 (2.6 ) 1,909.5 Depreciation, depletion and amortization 111.6 105.2 — 216.8 Asset retirement obligation expenses 12.5 9.9 — 22.4 Selling and administrative expenses 46.7 5.2 — 51.9 Restructuring charges 2.2 0.6 — 2.8 Other operating (income) loss: Net gain on disposal of assets (12.8 ) (2.8 ) — (15.6 ) Loss from equity affiliates and investment in subsidiaries 189.6 1.2 (188.2 ) 2.6 Interest expense 89.5 12.0 (6.0 ) 95.5 Interest income (2.1 ) (6.2 ) 6.0 (2.3 ) Reorganization items, net 121.8 3.3 — 125.1 Loss from continuing operations before income taxes (296.8 ) (176.2 ) 188.2 (284.8 ) Income tax (benefit) provision (38.5 ) 7.6 — (30.9 ) Loss from continuing operations, net of income taxes (258.3 ) (183.8 ) 188.2 (253.9 ) Loss from discontinued operations, net of income taxes (39.6 ) (0.9 ) — (40.5 ) Net loss (297.9 ) (184.7 ) 188.2 (294.4 ) Less: Net income attributable to noncontrolling interests — 3.5 — 3.5 Net loss attributable to common stockholders $ (297.9 ) $ (188.2 ) $ 188.2 $ (297.9 ) Three Months Ended September 30, 2016 Debtors Non-Debtors Eliminations Consolidated (Dollars in millions) Total revenues $ 793.1 $ 415.4 $ (1.4 ) $ 1,207.1 Costs and expenses Operating costs and expenses (exclusive of items shown separately below) 631.6 434.6 (1.4 ) 1,064.8 Depreciation, depletion and amortization 61.9 55.9 — 117.8 Asset retirement obligation expenses 7.3 5.4 — 12.7 Selling and administrative expenses 27.2 4.9 — 32.1 Restructuring charges 0.2 0.1 — 0.3 Other operating (income) loss: Net gain on disposal of assets (1.9 ) — — (1.9 ) Loss from equity affiliates and investment in subsidiaries 97.8 2.3 (97.2 ) 2.9 Interest expense 55.7 6.5 (3.7 ) 58.5 Interest income (1.2 ) (3.8 ) 3.7 (1.3 ) Reorganization items, net 28.8 0.9 — 29.7 Loss from continuing operations before income taxes (114.3 ) (91.4 ) 97.2 (108.5 ) Income tax (benefit) provision (16.0 ) 3.1 — (12.9 ) Loss from continuing operations, net of income taxes (98.3 ) (94.5 ) 97.2 (95.6 ) Loss from discontinued operations, net of income taxes (37.2 ) (0.9 ) — (38.1 ) Net loss (135.5 ) (95.4 ) 97.2 (133.7 ) Less: Net income attributable to noncontrolling interests — 1.8 — 1.8 Net loss attributable to common stockholders $ (135.5 ) $ (97.2 ) $ 97.2 $ (135.5 )
Supplemental Guarantor Non Guarantor Financial Information Disclosure [Text Block]	Supplemental Financial Information Guarantor / Non-Guarantor In accordance with the indentures governing the Senior Notes, certain 100% owned U.S. subsidiaries of the Company (each, a Guarantor Subsidiary) have fully and unconditionally guaranteed the Senior Notes, on a joint and several basis. The indentures governing the Senior Notes contain customary exceptions under which a guarantee of a Guarantor Subsidiary will terminate, including (a) the release or discharge of the guarantee of the Company’s 2013 Credit Facility by such Guarantor Subsidiary, except a discharge or release by or as a result of payment under such guarantee, (b) a sale or other disposition, by way of merger, consolidation or otherwise, of all of the capital stock of such Guarantor Subsidiary, and (c) the legal defeasance or discharge of the indentures. Separate financial statements and other disclosures concerning the Guarantor Subsidiaries are not presented because management believes that such information is not material to the holders of the Senior Notes. The following historical financial statement information is provided for the Guarantor/Non-Guarantor Subsidiaries. Three Months Ended September 30, 2016 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated (Dollars in millions) Total revenues $ — $ 800.7 $ 497.0 $ (90.6 ) $ 1,207.1 Costs and expenses Operating costs and expenses (exclusive of items shown separately below) 47.4 598.7 509.3 (90.6 ) 1,064.8 Depreciation, depletion and amortization — 55.9 61.9 — 117.8 Asset retirement obligation expenses — 5.4 7.3 — 12.7 Selling and administrative expenses 3.7 23.4 5.0 — 32.1 Restructuring charges — 0.1 0.2 — 0.3 Other operating (income) loss: Net gain on disposal of assets — (1.8 ) (0.1 ) — (1.9 ) (Income) loss from equity affiliates and investment in subsidiaries (14.0 ) 0.7 2.2 14.0 2.9 Interest expense 56.1 4.7 6.5 (8.8 ) 58.5 Interest income — (1.2 ) (8.9 ) 8.8 (1.3 ) Reorganization items, net (0.8 ) 29.7 0.8 — 29.7 (Loss) income from continuing operations before income taxes (92.4 ) 85.1 (87.2 ) (14.0 ) (108.5 ) Income tax provision (benefit) 6.2 (23.7 ) 4.6 — (12.9 ) (Loss) income from continuing operations, net of income taxes (98.6 ) 108.8 (91.8 ) (14.0 ) (95.6 ) Loss from discontinued operations, net of income taxes (36.9 ) (0.3 ) (0.9 ) — (38.1 ) Net (loss) income (135.5 ) 108.5 (92.7 ) (14.0 ) (133.7 ) Less: Net income attributable to noncontrolling interests — — 1.8 — 1.8 Net (loss) income attributable to common stockholders $ (135.5 ) $ 108.5 $ (94.5 ) $ (14.0 ) $ (135.5 ) Unaudited Supplemental Condensed Consolidating Statements of Comprehensive Income Three Months Ended September 30, 2016 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated (Dollars in millions) Net (loss) income $ (135.5 ) $ 108.5 $ (92.7 ) $ (14.0 ) $ (133.7 ) Other comprehensive income, net of income taxes 35.0 5.1 1.5 (6.6 ) 35.0 Comprehensive (loss) income (100.5 ) 113.6 (91.2 ) (20.6 ) (98.7 ) Less: Comprehensive income attributable to noncontrolling interests — — 1.8 — 1.8 Comprehensive (loss) income attributable to common stockholders $ (100.5 ) $ 113.6 $ (93.0 ) $ (20.6 ) $ (100.5 ) Unaudited Supplemental Condensed Consolidating Statements of Operations Three Months Ended September 30, 2015 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated (Dollars in millions) Total revenues $ — $ 902.4 $ 640.4 $ (123.9 ) $ 1,418.9 Costs and expenses Operating costs and expenses (exclusive of items shown separately below) 116.8 710.6 550.5 (123.9 ) 1,254.0 Depreciation, depletion and amortization — 62.0 74.0 — 136.0 Asset retirement obligation expenses — 4.2 8.1 — 12.3 Selling and administrative expenses 6.5 28.6 2.7 — 37.8 Restructuring charges — 0.8 1.0 — 1.8 Other operating loss (income): Net loss (gain) on disposal of assets 0.1 (6.6 ) (1.4 ) — (7.9 ) (Income) loss from equity affiliates and investment in subsidiaries (100.7 ) 1.8 3.5 100.7 5.3 Interest expense 120.4 4.4 2.4 (8.7 ) 118.5 Interest income (0.1 ) (0.5 ) (9.5 ) 8.7 (1.4 ) (Loss) income from continuing operations before income taxes (143.0 ) 97.1 9.1 (100.7 ) (137.5 ) Income tax provision 4.6 1.8 0.5 — 6.9 (Loss) income from continuing operations, net of income taxes (147.6 ) 95.3 8.6 (100.7 ) (144.4 ) Loss from discontinued operations, net of income taxes (157.1 ) (0.3 ) (0.1 ) — (157.5 ) Net (loss) income (304.7 ) 95.0 8.5 (100.7 ) (301.9 ) Less: Net (loss) income attributable to noncontrolling interests — (0.2 ) 3.0 — 2.8 Net (loss) income attributable to common stockholders $ (304.7 ) $ 95.2 $ 5.5 $ (100.7 ) $ (304.7 ) Unaudited Supplemental Condensed Consolidating Statements of Comprehensive Income Three Months Ended September 30, 2015 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated (Dollars in millions) Net (loss) income $ (304.7 ) $ 95.0 $ 8.5 $ (100.7 ) $ (301.9 ) Other comprehensive (loss) income, net of income taxes (51.0 ) 12.1 (26.9 ) 14.8 (51.0 ) Comprehensive (loss) income (355.7 ) 107.1 (18.4 ) (85.9 ) (352.9 ) Less: Comprehensive (loss) income attributable to noncontrolling interests — (0.2 ) 3.0 — 2.8 Comprehensive (loss) income attributable to common stockholders $ (355.7 ) $ 107.3 $ (21.4 ) $ (85.9 ) $ (355.7 ) Unaudited Supplemental Condensed Consolidating Statements of Operations Nine Months Ended September 30, 2016 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated (Dollars in millions) Total revenues $ — $ 2,087.2 $ 1,421.6 $ (234.3 ) $ 3,274.5 Costs and expenses Operating costs and expenses (exclusive of items shown separately below) 129.7 1,597.3 1,488.5 (234.3 ) 2,981.2 Depreciation, depletion and amortization — 157.6 187.9 — 345.5 Asset retirement obligation expenses — 17.3 20.0 — 37.3 Selling and administrative expenses 8.8 95.8 10.0 — 114.6 Restructuring charges — 11.9 3.6 — 15.5 Other operating (income) loss: Net gain on disposal of assets — (14.5 ) (2.9 ) — (17.4 ) Asset impairment — — 17.2 — 17.2 Loss from equity affiliates and investment in subsidiaries 89.8 2.8 9.8 (89.8 ) 12.6 Interest expense 234.5 15.1 19.3 (25.2 ) 243.7 Interest income (0.2 ) (3.2 ) (25.8 ) 25.2 (4.0 ) Reorganization items, net 74.1 47.8 3.2 — 125.1 (Loss) income from continuing operations before income taxes (536.7 ) 159.3 (309.2 ) 89.8 (596.8 ) Income tax (benefit) provision (41.8 ) (70.5 ) 3.6 — (108.7 ) (Loss) income from continuing operations, net of income taxes (494.9 ) 229.8 (312.8 ) 89.8 (488.1 ) Loss from discontinued operations, net of income taxes (41.2 ) (1.4 ) (1.9 ) — (44.5 ) Net (loss) income (536.1 ) 228.4 (314.7 ) 89.8 (532.6 ) Less: Net income attributable to noncontrolling interests — — 3.5 — 3.5 Net (loss) income attributable to common stockholders $ (536.1 ) $ 228.4 $ (318.2 ) $ 89.8 $ (536.1 ) Unaudited Supplemental Condensed Consolidating Statements of Comprehensive Income Nine Months Ended September 30, 2016 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated (Dollars in millions) Net (loss) income $ (536.1 ) $ 228.4 $ (314.7 ) $ 89.8 $ (532.6 ) Other comprehensive income, net of income taxes 132.2 15.4 2.4 (17.8 ) 132.2 Comprehensive (loss) income (403.9 ) 243.8 (312.3 ) 72.0 (400.4 ) Less: Comprehensive income attributable to noncontrolling interests — — 3.5 — 3.5 Comprehensive (loss) income attributable to common stockholders $ (403.9 ) $ 243.8 $ (315.8 ) $ 72.0 $ (403.9 ) Unaudited Supplemental Condensed Consolidating Statements of Operations Nine Months Ended September 30, 2015 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated (Dollars in millions) Total revenues $ — $ 2,699.7 $ 1,951.1 $ (354.7 ) $ 4,296.1 Costs and expenses Operating costs and expenses (exclusive of items shown separately below) 326.9 2,109.8 1,692.4 (354.7 ) 3,774.4 Depreciation, depletion and amortization — 189.2 241.4 — 430.6 Asset retirement obligation expenses — 13.9 26.5 — 40.4 Selling and administrative expenses 24.3 95.3 9.2 — 128.8 Restructuring charges (3.9 ) 11.0 15.9 — 23.0 Other operating (income) loss: Net gain on disposal of assets (2.3 ) (16.9 ) (1.0 ) — (20.2 ) Asset impairment — 182.2 718.6 — 900.8 Loss from equity affiliates and investment in subsidiaries 594.9 4.7 7.6 (594.9 ) 12.3 Interest expense 348.3 13.5 7.9 (25.7 ) 344.0 Loss on early debt extinguishment 67.8 — — — 67.8 Interest income (0.5 ) (1.8 ) (30.0 ) 25.7 (6.6 ) (Loss) income from continuing operations before income taxes (1,355.5 ) 98.8 (737.4 ) 594.9 (1,399.2 ) Income tax (benefit) provision (20.6 ) (63.0 ) 0.4 — (83.2 ) (Loss) income from continuing operations, net of income taxes (1,334.9 ) 161.8 (737.8 ) 594.9 (1,316.0 ) Loss from discontinued operations, net of income taxes (191.7 ) (2.2 ) (8.8 ) — (202.7 ) Net (loss) income (1,526.6 ) 159.6 (746.6 ) 594.9 (1,518.7 ) Less: Net income attributable to noncontrolling interests — 0.5 7.4 — 7.9 Net (loss) income attributable to common stockholders $ (1,526.6 ) $ 159.1 $ (754.0 ) $ 594.9 $ (1,526.6 ) Unaudited Supplemental Condensed Consolidating Statements of Comprehensive Income Nine Months Ended September 30, 2015 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated (Dollars in millions) Net (loss) income $ (1,526.6 ) $ 159.6 $ (746.6 ) $ 594.9 $ (1,518.7 ) Other comprehensive income (loss), net of income taxes 69.0 31.1 (67.7 ) 36.6 69.0 Comprehensive (loss) income (1,457.6 ) 190.7 (814.3 ) 631.5 (1,449.7 ) Less: Comprehensive income attributable to noncontrolling interests — 0.5 7.4 — 7.9 Comprehensive (loss) income attributable to common stockholders $ (1,457.6 ) $ 190.2 $ (821.7 ) $ 631.5 $ (1,457.6 ) Unaudited Supplemental Condensed Consolidating Balance Sheets September 30, 2016 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Reclassifications/ Eliminations Consolidated (Dollars in millions) Assets Current assets Cash and cash equivalents $ 687.5 $ 3.1 $ 477.2 $ — $ 1,167.8 Restricted cash 1.4 — 22.8 — 24.2 Accounts receivable, net — 22.4 329.5 — 351.9 Receivables from affiliates, net 1,035.2 — 633.4 (1,668.6 ) — Inventories — 86.7 172.9 — 259.6 Assets from coal trading activities, net — 0.1 19.8 — 19.9 Deferred income taxes — 65.3 — (11.8 ) 53.5 Other current assets 22.1 107.9 238.9 — 368.9 Total current assets 1,746.2 285.5 1,894.5 (1,680.4 ) 2,245.8 Property, plant, equipment and mine development, net — 4,419.3 4,796.2 — 9,215.5 Deferred income taxes — 63.2 2.3 (63.2 ) 2.3 Investments and other assets 8,761.5 3.7 501.1 (8,494.7 ) 771.6 Notes receivable from affiliates, net — 877.0 155.6 (1,032.6 ) — Total assets $ 10,507.7 $ 5,648.7 $ 7,349.7 $ (11,270.9 ) $ 12,235.2 Liabilities and Stockholders’ Equity Current liabilities Current portion of long-term debt $ 470.5 $ 20.5 $ 2.1 $ — $ 493.1 Payables to affiliates, net — 1,668.6 — (1,668.6 ) — Deferred income taxes 11.8 — 4.1 (11.8 ) 4.1 Liabilities from coal trading activities, net — 0.1 19.4 — 19.5 Accounts payable and accrued expenses 47.5 380.6 403.7 — 831.8 Total current liabilities 529.8 2,069.8 429.3 (1,680.4 ) 1,348.5 Deferred income taxes 165.8 — 5.0 (63.2 ) 107.6 Notes payable to affiliates, net 1,032.6 — — (1,032.6 ) — Other noncurrent liabilities 154.8 1,277.7 491.1 — 1,923.6 Total liabilities not subject to compromise 1,883.0 3,347.5 925.4 (2,776.2 ) 3,379.7 Liabilities subject to compromise 8,104.0 209.0 18.6 — 8,331.6 Total liabilities 9,987.0 3,556.5 944.0 (2,776.2 ) 11,711.3 Peabody Energy Corporation stockholders’ equity 520.7 2,092.2 6,402.5 (8,494.7 ) 520.7 Noncontrolling interests — — 3.2 — 3.2 Total stockholders’ equity 520.7 2,092.2 6,405.7 (8,494.7 ) 523.9 Total liabilities and stockholders’ equity $ 10,507.7 $ 5,648.7 $ 7,349.7 $ (11,270.9 ) $ 12,235.2 Unaudited Supplemental Condensed Consolidating Balance Sheets December 31, 2015 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Reclassifications/ Eliminations Consolidated (Dollars in millions) Assets Current assets Cash and cash equivalents $ 7.2 $ 4.7 $ 249.4 $ — $ 261.3 Accounts receivable, net — 12.1 216.7 — 228.8 Receivables from affiliates, net 582.1 — 948.1 (1,530.2 ) — Inventories — 109.4 198.4 — 307.8 Assets from coal trading activities, net — 3.2 20.3 — 23.5 Deferred income taxes — 65.3 — (11.8 ) 53.5 Other current assets 23.1 128.1 296.4 — 447.6 Total current assets 612.4 322.8 1,929.3 (1,542.0 ) 1,322.5 Property, plant, equipment and mine development, net — 4,304.8 4,953.7 — 9,258.5 Deferred income taxes — 33.1 — (30.9 ) 2.2 Investments and other assets 8,476.2 3.6 185.5 (8,301.6 ) 363.7 Notes receivable from affiliates, net — 632.7 399.9 (1,032.6 ) — Total assets $ 9,088.6 $ 5,297.0 $ 7,468.4 $ (10,907.1 ) $ 10,946.9 Liabilities and Stockholders’ Equity Current liabilities Current portion of long-term debt $ 5,844.0 $ 23.8 $ 7.1 $ — $ 5,874.9 Payables to affiliates, net — 1,530.2 — (1,530.2 ) — Deferred income taxes 11.8 — 3.8 (11.8 ) 3.8 Liabilities from coal trading activities, net — 4.8 10.8 — 15.6 Accounts payable and accrued expenses 494.8 479.8 467.9 — 1,442.5 Total current liabilities 6,350.6 2,038.6 489.6 (1,542.0 ) 7,336.8 Long-term debt, less current portion 366.3 — — — 366.3 Deferred income taxes 98.6 — 1.4 (30.9 ) 69.1 Notes payable to affiliates, net 1,032.6 — — (1,032.6 ) — Other noncurrent liabilities 323.6 1,454.9 477.7 — 2,256.2 Total liabilities 8,171.7 3,493.5 968.7 (2,605.5 ) 10,028.4 Peabody Energy Corporation stockholders’ equity 916.9 1,803.5 6,498.1 (8,301.6 ) 916.9 Noncontrolling interests — — 1.6 — 1.6 Total stockholders’ equity 916.9 1,803.5 6,499.7 (8,301.6 ) 918.5 Total liabilities and stockholders’ equity $ 9,088.6 $ 5,297.0 $ 7,468.4 $ (10,907.1 ) $ 10,946.9 Unaudited Supplemental Condensed Consolidating Statements of Cash Flows Nine Months Ended September 30, 2016 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Consolidated (Dollars in millions) Cash Flows From Operating Activities Net cash (used in) provided by continuing operations $ (249.9 ) $ 89.3 $ (97.3 ) $ (257.9 ) Net cash used in discontinued operations (5.1 ) (13.1 ) (0.7 ) (18.9 ) Net cash (used in) provided by operating activities (255.0 ) 76.2 (98.0 ) (276.8 ) Cash Flows From Investing Activities Additions to property, plant, equipment and mine development — (26.3 ) (30.3 ) (56.6 ) Changes in accrued expenses related to capital expenditures — (1.1 ) (4.4 ) (5.5 ) Federal coal lease expenditures — (249.0 ) — (249.0 ) Proceeds from disposal of assets, net of notes receivable — 68.4 66.3 134.7 Contributions to joint ventures — — (241.7 ) (241.7 ) Distributions from joint ventures — — 236.7 236.7 Advances to related parties — — (23.3 ) (23.3 ) Repayments of loans from related parties — — 13.2 13.2 Other, net — (4.6 ) (3.6 ) (8.2 ) Net cash (used in) provided by investing activities — (212.6 ) 12.9 (199.7 ) Cash Flows From Financing Activities Proceeds from long-term debt 1,422.0 — 7.8 1,429.8 Repayments of long-term debt (3.0 ) (3.3 ) (4.9 ) (11.2 ) Payment of deferred financing costs (25.6 ) — (4.2 ) (29.8 ) Distributions to noncontrolling interests — — (3.9 ) (3.9 ) Other, net — (1.9 ) — (1.9 ) Transactions with affiliates, net (458.1 ) 140.0 318.1 — Net cash provided by financing activities 935.3 134.8 312.9 1,383.0 Net change in cash and cash equivalents 680.3 (1.6 ) 227.8 906.5 Cash and cash equivalents at beginning of period 7.2 4.7 249.4 261.3 Cash and cash equivalents at end of period $ 687.5 $ 3.1 $ 477.2 $ 1,167.8 Unaudited Supplemental Condensed Consolidating Statements of Cash Flows Nine Months Ended September 30, 2015 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Consolidated (Dollars in millions) Cash Flows From Operating Activities Net cash (used in) provided by continuing operations $ (649.0 ) $ 437.0 $ 150.0 $ (62.0 ) Net cash used in discontinued operations (23.2 ) (2.8 ) (2.6 ) (28.6 ) Net cash (used in) provided by operating activities (672.2 ) 434.2 147.4 (90.6 ) Cash Flows From Investing Activities Additions to property, plant, equipment and mine development — (44.8 ) (32.1 ) (76.9 ) Changes in accrued expenses related to capital expenditures — (3.4 ) (11.1 ) (14.5 ) Federal coal lease expenditures — (89.8 ) — (89.8 ) Proceeds from disposal of assets, net of notes receivable — 7.6 32.0 39.6 Purchases of debt and equity securities — — (22.6 ) (22.6 ) Proceeds from sales and maturities of debt and equity securities — — 33.6 33.6 Contributions to joint ventures — — (349.8 ) (349.8 ) Distributions from joint ventures — — 339.8 339.8 Advances to related parties — — (3.6 ) (3.6 ) Other, net — (1.8 ) (0.3 ) (2.1 ) Net cash used in investing activities — (132.2 ) (14.1 ) (146.3 ) Cash Flows From Financing Activities Proceeds from long-term debt 975.7 — — 975.7 Repayments of long-term debt (659.0 ) (0.6 ) (6.4 ) (666.0 ) Payment of deferred financing costs (28.7 ) — — (28.7 ) Dividends paid (1.4 ) — — (1.4 ) Distributions to noncontrolling interests — — (2.1 ) (2.1 ) Other, net 1.4 (1.6 ) (4.1 ) (4.3 ) Transactions with affiliates, net 339.7 (299.2 ) (40.5 ) — Net cash provided by (used in) financing activities 627.7 (301.4 ) (53.1 ) 273.2 Net change in cash and cash equivalents (44.5 ) 0.6 80.2 36.3 Cash and cash equivalents at beginning of period 188.7 3.6 105.7 298.0 Cash and cash equivalents at end of period $ 144.2 $ 4.2 $ 185.9 $ 334.3 Unaudited Supplemental Condensed Consolidating Balance Sheets September 30, 2016 Debtors Non-Debtors Reclassifications/Eliminations Consolidated (Dollars in millions) Assets Current assets Cash and cash equivalents $ 702.1 $ 465.7 $ — $ 1,167.8 Restricted cash 1.4 22.8 — 24.2 Accounts receivable, net 22.5 329.4 — 351.9 Receivables from affiliates, net 387.4 — (387.4 ) — Inventories 118.4 141.2 — 259.6 Assets from coal trading activities, net 0.1 19.8 — 19.9 Deferred income taxes 53.4 0.1 — 53.5 Other current assets 130.1 238.8 — 368.9 Total current assets 1,415.4 1,217.8 (387.4 ) 2,245.8 Property, plant, equipment and mine development, net 4,906.1 4,309.4 — 9,215.5 Deferred income taxes — 2.3 — 2.3 Investments and other assets 4,307.9 471.0 (4,007.3 ) 771.6 Notes receivable from affiliates, net 877.0 — (877.0 ) — Total assets $ 11,506.4 $ 6,000.5 $ (5,271.7 ) $ 12,235.2 Liabilities and Stockholders’ Equity Current liabilities Current portion of long-term debt $ 491.0 $ 2.1 $ — $ 493.1 Payables to affiliates, net — 387.4 (387.4 ) — Liabilities from coal trading activities, net 0.1 19.4 — 19.5 Accounts payable and accrued expenses 463.0 372.9 — 835.9 Total current liabilities 954.1 781.8 (387.4 ) 1,348.5 Deferred income taxes 102.7 4.9 — 107.6 Notes payable to affiliates, net — 877.0 (877.0 ) — Other noncurrent liabilities 1,597.3 326.3 — 1,923.6 Total liabilities not subject to compromise 2,654.1 1,990.0 (1,264.4 ) 3,379.7 Liabilities subject to compromise 8,331.6 — — 8,331.6 Total liabilities 10,985.7 1,990.0 (1,264.4 ) 11,711.3 Peabody Energy Corporation stockholders’ equity 520.7 4,007.3 (4,007.3 ) 520.7 Noncontrolling interests — 3.2 — 3.2 Total stockholders’ equity 520.7 4,010.5 (4,007.3 ) 523.9 Total liabilities and stockholders’ equity $ 11,506.4 $ 6,000.5 $ (5,271.7 ) $ 12,235.2 Unaudited Supplemental Condensed Consolidating Statements of Cash Flows The Period April 13 through September 30, 2016 Debtors Non-Debtors Consolidated (Dollars in millions) Cash Flows From Operating Activities Net cash provided by (used in) continuing operations $ 376.4 $ (121.5 ) $ 254.9 Net cash used in discontinued operations (5.8 ) (12.4 ) (18.2 ) Net cash provided by (used in) operating activities 370.6 (133.9 ) 236.7 Cash Flows From Investing Activities Additions to property, plant, equipment and mine development (26.4 ) (10.3 ) (36.7 ) Changes in accrued expenses related to capital expenditures 0.4 (1.9 ) (1.5 ) Federal coal lease expenditures (248.5 ) — (248.5 ) Proceeds from disposal of assets, net of notes receivable 66.3 66.2 132.5 Contributions to joint ventures — (140.5 ) (140.5 ) Distributions from joint ventures — 139.7 139.7 Advances to related parties — (22.7 ) (22.7 ) Repayments of loans from related parties — 11.9 11.9 Other, net (1.4 ) (1.5 ) (2.9 ) Net cash (used in) provided by investing activities (209.6 ) 40.9 (168.7 ) Cash Flows From Financing Activities Proceeds from long-term debt 475.0 7.8 482.8 Repayments of long-term debt (1.8 ) (2.3 ) (4.1 ) Payment of deferred financing costs (25.6 ) (1.4 ) (27.0 ) Distributions to noncontrolling interests — (3.9 ) (3.9 ) Other, net (0.1 ) — (0.1 ) Transactions with affiliates, net (14.9 ) 14.9 — Net cash provided by financing activities 432.6 15.1 447.7 Net change in cash and cash equivalents 593.6 (77.9 ) 515.7 Cash and cash equivalents at beginning of period 108.5 543.6 652.1 Cash and cash equivalents at end of period $ 702.1 $ 465.7 $ 1,167.8
SupplementalCondensedConsolidatingStatementsOfComprehensiveIncomeLoss [Table Text Block]	Unaudited Supplemental Condensed Consolidating Statements of Comprehensive Income Nine Months Ended September 30, 2015 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated (Dollars in millions) Net (loss) income $ (1,526.6 ) $ 159.6 $ (746.6 ) $ 594.9 $ (1,518.7 ) Other comprehensive income (loss), net of income taxes 69.0 31.1 (67.7 ) 36.6 69.0 Comprehensive (loss) income (1,457.6 ) 190.7 (814.3 ) 631.5 (1,449.7 ) Less: Comprehensive income attributable to noncontrolling interests — 0.5 7.4 — 7.9 Comprehensive (loss) income attributable to common stockholders $ (1,457.6 ) $ 190.2 $ (821.7 ) $ 631.5 $ (1,457.6 ) Unaudited Supplemental Condensed Consolidating Statements of Comprehensive Income Three Months Ended September 30, 2016 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated (Dollars in millions) Net (loss) income $ (135.5 ) $ 108.5 $ (92.7 ) $ (14.0 ) $ (133.7 ) Other comprehensive income, net of income taxes 35.0 5.1 1.5 (6.6 ) 35.0 Comprehensive (loss) income (100.5 ) 113.6 (91.2 ) (20.6 ) (98.7 ) Less: Comprehensive income attributable to noncontrolling interests — — 1.8 — 1.8 Comprehensive (loss) income attributable to common stockholders $ (100.5 ) $ 113.6 $ (93.0 ) $ (20.6 ) $ (100.5 ) Unaudited Supplemental Condensed Consolidating Statements of Comprehensive Income Nine Months Ended September 30, 2016 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated (Dollars in millions) Net (loss) income $ (536.1 ) $ 228.4 $ (314.7 ) $ 89.8 $ (532.6 ) Other comprehensive income, net of income taxes 132.2 15.4 2.4 (17.8 ) 132.2 Comprehensive (loss) income (403.9 ) 243.8 (312.3 ) 72.0 (400.4 ) Less: Comprehensive income attributable to noncontrolling interests — — 3.5 — 3.5 Comprehensive (loss) income attributable to common stockholders $ (403.9 ) $ 243.8 $ (315.8 ) $ 72.0 $ (403.9 ) Unaudited Supplemental Condensed Consolidating Statements of Comprehensive Income Three Months Ended September 30, 2015 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated (Dollars in millions) Net (loss) income $ (304.7 ) $ 95.0 $ 8.5 $ (100.7 ) $ (301.9 ) Other comprehensive (loss) income, net of income taxes (51.0 ) 12.1 (26.9 ) 14.8 (51.0 ) Comprehensive (loss) income (355.7 ) 107.1 (18.4 ) (85.9 ) (352.9 ) Less: Comprehensive (loss) income attributable to noncontrolling interests — (0.2 ) 3.0 — 2.8 Comprehensive (loss) income attributable to common stockholders $ (355.7 ) $ 107.3 $ (21.4 ) $ (85.9 ) $ (355.7 )

Subsequent Event (Notes)

Subsequent Event (Notes)	9 Months Ended
	Sep. 30, 2016
Subsequent Events [Abstract]
Subsequent Event [Text Block]	Subsequent Event On November 3, 2016, Peabody Australia Mining Pty Ltd, one of the Company’s Australian subsidiaries, entered into a definitive share sale and purchase agreement for the sale of all of the equity interests in Metropolitan Collieries Pty Ltd, the entity that owns the Metropolitan mine in New South Wales, Australia and the associated interest in the Port Kembla Coal Terminal, to a subsidiary of South32 Limited (South32). Pursuant to the agreement, the Company will receive cash consideration of $200 million , subject to a customary working capital adjustment. The transaction also includes contingent consideration that enables the Company to share equally with South32 in any revenue above an agreed metallurgical coal price forward curve, after taxes, royalties and appropriate discounts, on all coal sold for the 12 months following completion of the transaction, subject to extension if a minimum amount of coal is not sold during that period. The closing of the transaction is currently anticipated to occur in the first quarter of 2017 and is conditional on receipt of approval from the Australian Competition and Consumer Commission. The Company determined that, as a result of entering the transaction, and the approval of the Company’s Board of Directors of such a transaction in October 2016, the Metropolitan mine was deemed to meet held-for-sale accounting criteria in the fourth quarter of 2016. Accordingly, the Company expects to record an after-tax impairment charge of approximately $180 million to write down the assets to their estimated selling price, which is the best estimate of fair value under a held-for-sale accounting model. The Company expects to report the impairment charge in its Annual Report on Form 10-K for the year ended December 31, 2016.

Derivatives and Fair Value Me33

Derivatives and Fair Value Measurements Fair value transfer timing policy (Policies)	9 Months Ended
	Sep. 30, 2016
Fair Value Transfer Timing Policies (Policy) [Abstract]
Derivatives, Policy [Policy Text Block]	Though the symmetrical default provisions associated with the Company's Corporate Hedging derivatives exist at the overall counterparty level across its foreign currency and diesel fuel hedging strategy derivative contract portfolios, the Company's accounting policy is to apply counterparty offsetting separately within those derivative contract portfolios for presentation in the condensed consolidated balance sheets because that application is more consistent with the fact that the Company generally net settles its Corporate Hedging derivatives with each counterparty by derivative contract portfolio on a routine basis.
Fair Value Transfer, Policy [Policy Text Block]	The Company’s policy is to value all transfers between levels using the beginning of period valuation. The Company’s policy is to value all transfers between levels using the beginning of period valuation.

Coal Trading Coal Trading (Poli

Coal Trading Coal Trading (Policies)	9 Months Ended
	Sep. 30, 2016
Coal Trading Accounting Policies [Abstract]
Concentration Risk, Credit Risk, Policy [Policy Text Block]	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.
Fair Value Transfer, Policy [Policy Text Block]	The Company’s policy is to value all transfers between levels using the beginning of period valuation. The Company’s policy is to value all transfers between levels using the beginning of period valuation.

Newly Adopted Accounting Stan35

Newly Adopted Accounting Standards and Accounting Standards Not Yet Implemented Deferred Financing Costs (Tables)	9 Months Ended
	Sep. 30, 2016
Accounting Policies [Abstract]
Change in deferred financing costs accounting policy [Text Block]	The impact to the Company's condensed consolidated balance sheets as of December 31, 2015 was as follows: Before Application of Accounting Guidance Adjustment After Application of Accounting Guidance (Dollars in millions) Other current assets $ 503.1 $ (55.5 ) $ 447.6 Investments and other assets 382.6 (18.9 ) 363.7 Total assets 11,021.3 (74.4 ) 10,946.9 Current portion of long-term debt 5,930.4 (55.5 ) 5,874.9 Long-term debt, less current portion 385.2 (18.9 ) 366.3 Total liabilities 10,102.8 (74.4 ) 10,028.4

Reorganization Items, Net (Tabl

Reorganization Items, Net (Tables)	9 Months Ended
	Sep. 30, 2016
Reorganization Items, Net [Abstract]
Schedule of Reorganization Items [Table Text Block]	The Company's reorganization items for the three and nine months ended September 30, 2016 consisted of the following: Three Months Ended Nine Months Ended September 30, 2016 September 30, 2016 (Dollars in millions) Loss on termination of derivative contracts $ — $ 75.2 Professional fees 31.1 52.7 Accounts payable settlement gains (0.5 ) (0.7 ) Interest income (0.9 ) (1.1 ) Other — (1.0 ) Reorganization items, net $ 29.7 $ 125.1

Liabilities Subject to Compro37

Liabilities Subject to Compromise (Tables)	9 Months Ended
	Sep. 30, 2016
Liabilities Subject to Compromise [Abstract]
Schedule of liabilities subject to compromise [Table Text Block]	Liabilities subject to compromise consisted of the following: Previously Reported Balance Sheet Line September 30, 2016 (Dollars in millions) Debt (1) $ 7,920.4 Interest payable 172.6 Trade payables 77.3 Environmental liabilities 62.9 Postretirement benefit obligations (2) 34.0 UMWA 1974 Pension Plan liability (3) 25.0 Property taxes 7.1 Other accrued liabilities 32.3 Liabilities subject to compromise $ 8,331.6 (1) Includes $7,601.6 million of debt, $257.3 million of derivative contract terminations, and $61.5 million of liabilities secured by prepetition letters of credit. (2) Includes liabilities for unfunded non-qualified pension plans, all the participants of which are former employees. (3) Refer to Note 20. "Matters Related to the Bankruptcy of Patriot Coal Corporation" for additional information.

Asset Impairment (Tables)

Asset Impairment (Tables)	9 Months Ended
	Sep. 30, 2016
Asset Impairment Charges [Abstract]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table Text Block]	The following costs are reflected in "Asset impairment" in the unaudited condensed consolidated statement of operations for the nine months ended September 30, 2015 : Reportable Segment Australian Metallurgical Mining Australian Thermal Mining Corporate and Other Consolidated (Dollars in millions) Asset impairment charges: Long-lived assets $ 527.0 $ 8.2 $ 182.2 $ 717.4 Equity method investments — — 183.4 183.4 Total $ 527.0 $ 8.2 $ 365.6 $ 900.8

Discontinued Operations (Tables

Discontinued Operations (Tables)	9 Months Ended
	Sep. 30, 2016
Discontinued Operations and Disposal Groups [Abstract]
Results of discontinued operations [Table Text Block]	Results from discontinued operations were as follows during the three and nine months ended September 30, 2016 and 2015: Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 (Dollars in millions) Loss from discontinued operations, net of income taxes $ (38.1 ) $ (157.5 ) $ (44.5 ) $ (202.7 )
Assets and Liabilities of discontinued operations [Table Text Block]	Assets and liabilities classified as discontinued operations included in the Company's condensed consolidated balance sheets were as follows: September 30, 2016 December 31, 2015 (Dollars in millions) Assets: Other current assets $ 3.9 $ 3.1 Investments and other assets 13.2 13.2 Total assets classified as discontinued operations $ 17.1 $ 16.3 Liabilities: Accounts payable and accrued expenses $ 30.2 $ 60.0 Other noncurrent liabilities 197.0 203.7 Liabilities subject to compromise 45.9 — Total liabilities classified as discontinued operations $ 273.1 $ 263.7

Inventories (Tables)

Inventories (Tables)	9 Months Ended
	Sep. 30, 2016
Inventory Disclosure [Abstract]
Inventories	Inventories as of September 30, 2016 and December 31, 2015 consisted of the following: September 30, 2016 December 31, 2015 (Dollars in millions) Materials and supplies $ 110.7 $ 115.9 Raw coal 53.0 75.9 Saleable coal 95.9 116.0 Total $ 259.6 $ 307.8

Derivatives and Fair Value Me41

Derivatives and Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2016
Derivative [Line Items]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]	The following table summarizes the changes related to the Company’s Corporate Hedging derivative financial instruments recurring Level 3 financial liabilities: Nine Months Ended September 30, 2016 Commodity Contracts Foreign Currency Contracts Total (Dollars in millions) Beginning of period $ 123.7 $ 200.7 $ 324.4 Total net losses realized/unrealized: Included in earnings (1) 15.7 (48.0 ) (32.3 ) Settlements / terminations (139.4 ) (152.7 ) (292.1 ) End of period $ — $ — $ — (1) Includes reorganization items and realized gains (losses)
Non Coal Trading [Member]
Derivative [Line Items]
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 during the three and nine months ended September 30, 2016 and 2015 : Three Months Ended September 30, 2016 Financial Instrument Income Statement Total realized loss recognized in income Loss reclassified from other comprehensive loss into income (Loss) gain recognized 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 ) $ — $ — Three Months Ended September 30, 2015 Financial Instrument Income Statement Classification of (Losses) Gains Loss recognized in other comprehensive income on derivatives (effective portion) Loss reclassified from other comprehensive income into income (effective portion) (1) Loss reclassified from other comprehensive income into income (ineffective portion) (Dollars in millions) Commodity swap contracts Operating costs and expenses $ (63.1 ) $ (31.9 ) $ (0.5 ) Foreign currency forward contracts Operating costs and expenses (118.2 ) (84.5 ) — Total $ (181.3 ) $ (116.4 ) $ (0.5 ) (1) Includes the reclassification from "Accumulated other comprehensive loss" into earnings of $0.1 million of previously unrecognized gains on foreign currency cash flow hedge contracts monetized in the fourth quarter of 2012. Nine Months Ended September 30, 2016 Financial Instrument Income Statement Total realized loss recognized in income Loss reclassified from other comprehensive income into income (1) (Loss) gain recognized in income on derivatives Unrealized (loss) gain recognized in income on non- designated derivatives (Dollars in millions) Commodity swap contracts Operating costs and expenses $ (78.4 ) $ (66.4 ) $ (11.9 ) $ — Commodity swap contracts Reorganization items (38.8 ) — (38.8 ) — Foreign currency forward contracts Operating costs and expenses (119.4 ) (122.1 ) 2.7 — Foreign currency forward contracts Reorganization items (36.4 ) — (36.4 ) — Total $ (273.0 ) $ (188.5 ) $ (84.4 ) $ — (1) Includes the reclassification from "Accumulated other comprehensive 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. Nine Months Ended September 30, 2015 Financial Instrument Income Statement Classification of (Losses) Gains Loss recognized in other comprehensive income on derivatives (effective portion) Loss reclassified from other comprehensive income into income (effective portion) (1) Gain reclassified from other comprehensive income into income (ineffective portion) (Dollars in millions) Commodity swap contracts Operating costs and expenses $ (27.3 ) $ (89.0 ) $ 1.3 Foreign currency forward contracts Operating costs and expenses (137.2 ) (238.9 ) — Total $ (164.5 ) $ (327.9 ) $ 1.3 (1) Includes the reclassification from "Accumulated other comprehensive loss" into earnings of $14.9 million of previously unrecognized gains on foreign currency cash flow hedge contracts monetized in the fourth quarter of 2012.
Classification and amount of non-coal trading derivatives, gross and net basis	The classification and amount of Corporate Hedging derivative financial instruments presented on a gross and net basis as of December 31, 2015 are presented in the table that follows. Financial Instrument Fair Value of Liabilities Presented in the Condensed Consolidated Balance Sheet as of December 31, 2015 (1) (Dollars in millions) Current Liabilities: Commodity swap contracts $ 86.1 Foreign currency forward contracts 145.6 Total $ 231.7 Noncurrent Liabilities: Commodity swap contracts $ 37.6 Foreign currency forward contracts 55.1 Total $ 92.7 (1) All commodity swap contracts and foreign currency forward contracts were in a liability position as of December 31, 2015.
Fair value measured on recurring basis of net financial assets and liabilities	Financial Instruments Measured on a Recurring Basis. The following tables set forth the hierarchy of the Company’s net financial liability positions for which fair value is measured on a recurring basis: December 31, 2015 Level 1 Level 2 Level 3 Total (Dollars in millions) Commodity swap contracts — — (123.7 ) (123.7 ) Foreign currency contracts — — (200.7 ) (200.7 ) Total net financial liabilities $ — $ — $ (324.4 ) $ (324.4 )
Carrying amounts and estimated fair values of the Company's debt	The estimated fair value of the Company’s current and long-term debt as of September 30, 2016 is subject to compromise in connection with the Company's plan of reorganization and as such has been excluded from the table below. The carrying amount and estimated fair value of the Company's current and long-term debt as of December 31, 2015 are summarized as follows: December 31, 2015 Carrying Amount Estimated Fair Value (Dollars in millions) Current and Long-term debt $ 6,241.2 $ 1,372.7

Coal Trading (Tables)

Coal Trading (Tables) - Coal Trading [Member]	9 Months Ended
	Sep. 30, 2016
Coal Trading [Line Items]
Trading revenues by type of instrument	Trading (losses) revenues recognized during the three and nine months ended September 30, 2016 and 2015 were as follows: Three Months Ended Nine Months Ended September 30, September 30, Trading Revenues by Type of Instrument 2016 2015 2016 2015 (Dollars in millions) Futures, swaps and options $ (32.4 ) $ 47.7 $ (68.7 ) $ 89.4 Physical purchase/sale contracts 13.2 (23.2 ) 36.1 (46.7 ) Total trading (losses) revenues $ (19.2 ) $ 24.5 $ (32.6 ) $ 42.7
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, 2016 and December 31, 2015 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 (Held) Posted (1) Net Amounts of Assets (Liabilities) Presented in the Condensed Consolidated Balance Sheets (Dollars in millions) Fair Value as of September 30, 2016 Assets from coal trading activities, net $ 169.9 $ (149.1 ) $ (0.9 ) $ 19.9 Liabilities from coal trading activities, net (227.4 ) 149.1 58.8 (19.5 ) Total, net $ (57.5 ) $ — $ 57.9 $ 0.4 Fair Value as of December 31, 2015 Assets from coal trading activities, net $ 128.6 $ (87.3 ) $ (17.8 ) $ 23.5 Liabilities from coal trading activities, net (110.0 ) 87.3 7.1 (15.6 ) Total, net $ 18.6 $ — $ (10.7 ) $ 7.9 (1) None of the net variation margin held at September 30, 2016 and December 31, 2015, 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, 2016 and December 31, 2015 : September 30, 2016 Level 1 Level 2 Level 3 Total (Dollars in millions) Futures, swaps and options $ — $ (0.1 ) $ (0.2 ) $ (0.3 ) Physical purchase/sale contracts — 1.2 (0.5 ) 0.7 Total net financial assets (liabilities) $ — $ 1.1 $ (0.7 ) $ 0.4 December 31, 2015 Level 1 Level 2 Level 3 Total (Dollars in millions) Futures, swaps and options $ — $ 3.3 $ — $ 3.3 Physical purchase/sale contracts — 20.2 (15.6 ) 4.6 Total net financial assets (liabilities) $ — $ 23.5 $ (15.6 ) $ 7.9
Fair Value Inputs, Assets, Quantitative Information [Table Text Block]	The following table summarizes the quantitative unobservable inputs utilized in the Company's internally-developed valuation models for physical commodity purchase/sale contracts classified as Level 3 as of September 30, 2016 : Range Weighted Input Low High Average Quality adjustments 2 % 2 % 2 % Location differentials 9 % 9 % 9 % Credit and non-performance risk 26 % 26 % 26 %
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]	The following table summarizes the changes in the Company’s recurring Level 3 net financial assets: Three Months Ended September 30, Nine Months Ended September 30, 2016 2015 2016 2015 (Dollars in millions) Beginning of period $ (1.1 ) $ 1.8 $ (15.6 ) $ 2.1 Transfers into Level 3 4.6 — 5.0 — Transfers out of Level 3 (11.1 ) — (0.4 ) — Total gains realized/unrealized: Included in earnings 2.6 — 1.2 0.5 Sales 0.1 — — — Settlements 4.2 (0.5 ) 9.1 (1.3 ) End of period $ (0.7 ) $ 1.3 $ (0.7 ) $ 1.3
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Table Text Block]	The following table summarizes the changes in net unrealized (losses) gains relating to Level 3 net financial assets held both as of the beginning and the end of the period: Three Months Ended September 30, Nine Months Ended September 30, 2016 2015 2016 2015 (Dollars in millions) Changes in unrealized gains (losses) (1) $ 0.1 $ 0.1 $ (0.1 ) $ 0.4 (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 Future Realization Of Trading Portfolio [Table Text Block]	As of September 30, 2016 , the timing of the estimated future realization of the value of the Company’s trading portfolio, on a cumulative cash basis, was as follows: Percentage of Year of Expiration Portfolio Total 2016 66 % 2017 (171 )% 2018 5 % (100 )%

Financing Receivables (Tables)

Financing Receivables (Tables)	9 Months Ended
	Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]	The Company's total financing receivables as of September 30, 2016 and December 31, 2015 consisted of the following: Balance Sheet Classification September 30, 2016 December 31, 2015 (Dollars in millions) Other current assets $ — $ 20.0 Investments and other assets 68.6 65.2 Total financing receivables $ 68.6 $ 85.2

Property, Plant, Equipment an44

Property, Plant, Equipment and Mine Development (Tables)	9 Months Ended
	Sep. 30, 2016
Property, Plant, Equipment and Mine Development, Net [Line Items]
Property, Plant and Equipment [Table Text Block]	Property, plant, equipment and mine development, net, as of September 30, 2016 and December 31, 2015 consisted of the following: September 30, 2016 December 31, 2015 (Dollars in millions) Land and coal interests $ 10,756.7 $ 10,503.7 Buildings and improvements 1,533.0 1,506.0 Machinery and equipment 2,272.5 2,280.4 Less: Accumulated depreciation, depletion and amortization (5,346.7 ) (5,031.6 ) Total, net $ 9,215.5 $ 9,258.5

Long-term Debt (Tables)

Long-term Debt (Tables)	9 Months Ended
	Sep. 30, 2016
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments [Table Text Block]	The Company’s total indebtedness as of September 30, 2016 and December 31, 2015 consisted of the following: September 30, 2016 December 31, 2015 (Dollars in millions) 2013 Revolver $ 1,388.4 $ — 2013 Term Loan Facility due September 2020 1,154.5 1,156.3 6.00% Senior Notes due November 2018 1,509.9 1,508.9 6.50% Senior Notes due September 2020 645.8 645.5 6.25% Senior Notes due November 2021 1,327.7 1,327.0 10.00% Senior Secured Second Lien Notes due March 2022 962.3 960.4 7.875% Senior Notes due November 2026 245.9 245.8 Convertible Junior Subordinated Debentures due December 2066 367.1 366.3 DIP Term Loan Facility 470.5 — Capital lease obligations 22.1 30.3 Other 0.5 0.7 8,094.7 6,241.2 Less: Liabilities subject to compromise 7,601.6 — Less: Current portion of long-term debt 493.1 5,874.9 Long-term debt $ — $ 366.3

Pension and Postretirement Be46

Pension and Postretirement Benefit Costs (Tables)	9 Months Ended
	Sep. 30, 2016
Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Schedule of Net Benefit Costs [Table Text Block]	Net periodic pension cost included the following components: Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 (Dollars in millions) Service cost for benefits earned $ 0.7 $ 0.7 $ 2.0 $ 2.0 Interest cost on projected benefit obligation 10.3 10.1 31.0 30.3 Expected return on plan assets (11.3 ) (12.0 ) (33.9 ) (36.1 ) Amortization of prior service cost and net actuarial loss 6.3 10.0 18.8 30.4 Net periodic pension cost $ 6.0 $ 8.8 $ 17.9 $ 26.6
Other Postretirement Benefit Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Schedule of Net Benefit Costs [Table Text Block]	Net periodic postretirement benefit cost included the following components: Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 (Dollars in millions) Service cost for benefits earned $ 2.6 $ 2.8 $ 7.8 $ 8.4 Interest cost on accumulated postretirement benefit obligation 8.5 8.4 25.6 25.3 Amortization of prior service cost and net actuarial loss 2.4 4.6 7.1 13.6 Net periodic postretirement benefit cost $ 13.5 $ 15.8 $ 40.5 $ 47.3

Accumulated Other Comprehensi47

Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss (Tables)	9 Months Ended
	Sep. 30, 2016
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
After-tax components of comprehensive loss	The following table sets forth the after-tax components of accumulated other comprehensive loss and changes thereto recorded during the nine months ended September 30, 2016 : 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 Loss (Dollars in millions) December 31, 2015 $ (146.4 ) $ (263.8 ) $ 31.8 $ (240.5 ) $ (618.9 ) Reclassification from other comprehensive income to earnings — 15.8 (5.0 ) 119.0 129.8 Current period change 2.4 — — — 2.4 September 30, 2016 $ (144.0 ) $ (248.0 ) $ 26.8 $ (121.5 ) $ (486.7 )
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]	The following table provides additional information regarding items reclassified out of "Accumulated other comprehensive loss" into earnings during the three months ended September 30, 2016 and 2015: Amount reclassified from accumulated other comprehensive loss (1) Details about accumulated other comprehensive loss components Three Months Ended September 30, 2016 Three Months Ended September 30, 2015 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 ) $ (6.3 ) Operating costs and expenses Defined benefit pension plans (5.1 ) (8.2 ) Operating costs and expenses Defined benefit pension plans (1.1 ) (1.6 ) Selling and administrative expenses Insignificant items 3.0 2.0 (8.4 ) (14.1 ) Total before income taxes 3.1 1.6 Income tax benefit $ (5.3 ) $ (12.5 ) Total after income taxes Prior service credit associated with postretirement plans: Postretirement health care and life insurance benefits $ 2.8 $ 1.7 Operating costs and expenses Defined benefit pension plans (0.1 ) (0.2 ) Operating costs and expenses 2.7 1.5 Total before income taxes (1.0 ) 0.2 Income tax (provision) benefit $ 1.7 $ 1.7 Total after income taxes Cash flow hedges: Foreign currency cash flow hedge contracts (28.0 ) $ (84.5 ) Operating costs and expenses Fuel and explosives commodity swaps (19.4 ) (32.4 ) Operating costs and expenses Coal trading futures, swaps and options — 13.2 Other revenues Insignificant items (0.1 ) (0.2 ) (47.5 ) (103.9 ) Total before income taxes 17.6 35.0 Income tax benefit $ (29.9 ) $ (68.9 ) Total after income taxes (1) Presented as gains (losses) in the unaudited condensed consolidated statements of operations. The following table provides additional information regarding items reclassified out of "Accumulated other comprehensive loss" into earnings during the nine months ended September 30, 2016 and 2015: Amount reclassified from accumulated other comprehensive loss (1) Details about accumulated other comprehensive loss components Nine Months Ended September 30, 2016 Nine Months Ended September 30, 2015 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 $ (15.4 ) $ (18.7 ) Operating costs and expenses Defined benefit pension plans (15.3 ) (24.7 ) Operating costs and expenses Defined benefit pension plans (3.2 ) (5.0 ) Selling and administrative expenses Insignificant items 8.8 6.0 (25.1 ) (42.4 ) Total before income taxes 9.3 12.1 Income tax benefit $ (15.8 ) $ (30.3 ) Total after income taxes Prior service credit associated with postretirement plans: Postretirement health care and life insurance benefits $ 8.3 $ 5.1 Operating costs and expenses Defined benefit pension plans (0.3 ) (0.7 ) Operating costs and expenses 8.0 4.4 Total before income taxes (3.0 ) (0.9 ) Income tax provision $ 5.0 $ 3.5 Total after income taxes Cash flow hedges: Foreign currency cash flow hedge contracts $ (122.1 ) $ (238.9 ) Operating costs and expenses Fuel and explosives commodity swaps (66.4 ) (87.7 ) Operating costs and expenses Coal trading futures, swaps and options — 35.6 Other revenues Insignificant items (0.4 ) (0.5 ) (188.9 ) (291.5 ) Total before income taxes 69.9 107.6 Income tax benefit $ (119.0 ) $ (183.9 ) 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, 2016
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. The number of shares and per share amounts for all periods presented below have been retroactively restated to reflect the Reverse Stock Split discussed in Note 1. "Basis of Presentation." Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 (In millions, except per share data) EPS numerator: Loss from continuing operations, net of income taxes $ (95.6 ) $ (144.4 ) $ (488.1 ) $ (1,316.0 ) Less: Net income attributable to noncontrolling interests 1.8 2.8 3.5 7.9 Loss from continuing operations attributable to common stockholders, after allocation of earnings to participating securities (97.4 ) (147.2 ) (491.6 ) (1,323.9 ) Loss from discontinued operations attributable to common stockholders, after allocation of earnings to participating securities (38.1 ) (157.5 ) (44.5 ) (202.7 ) Net loss attributable to common stockholders, after earnings allocated to participating securities $ (135.5 ) $ (304.7 ) $ (536.1 ) $ (1,526.6 ) EPS denominator: Weighted average shares outstanding — basic and diluted 18.3 18.2 18.3 18.1 Basic and diluted EPS attributable to common stockholders: Loss from continuing operations $ (5.32 ) $ (8.08 ) $ (26.88 ) $ (73.05 ) Loss from discontinued operations (2.09 ) (8.65 ) (2.43 ) (11.18 ) Net loss attributable to common stockholders $ (7.41 ) $ (16.73 ) $ (29.31 ) $ (84.23 )

Financial Instruments, Guaran49

Financial Instruments, Guarantees with Off-Balance-Sheet Risk and Other Guarantees (Tables)	9 Months Ended
	Sep. 30, 2016
Financial Instruments And Guarantees With Off Balance Sheet Risk Disclosure [Abstract]
Financial instruments with off-balance sheet risk:	As of September 30, 2016 , the Company had the following financial instruments and other guarantees: Reclamation Obligations Lease Obligations Workers’ Compensation Obligations Other (1) Total Letters of Credit and Cash Collateral in Support of Financial Instruments (Dollars in millions) Self-bonding $ 1,127.5 $ — $ — $ — $ 1,127.5 $ — Surety bonds 320.1 96.7 19.1 15.3 451.2 112.6 Bank guarantees 170.7 — — 26.1 196.8 202.4 Other letters of credit — — 52.0 104.5 156.5 — Total $ 1,618.3 $ 96.7 $ 71.1 $ 145.9 $ 1,932.0 $ 315.0 (1) Other includes the $37.0 million in letters of credit related to TXU Europe Limited described below and an additional $108.9 million in bank guarantees, letters of credit and surety bonds related to collateral for road maintenance, performance guarantees and other operations.

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2016
Segment Reporting [Abstract]
Reportable segment results	Reportable segment results were as follows: Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 (Dollars in millions) Revenues: Powder River Basin Mining $ 419.6 $ 475.0 $ 1,062.2 $ 1,393.9 Midwestern U.S. Mining 211.0 249.4 599.6 768.2 Western U.S. Mining 162.4 177.3 387.0 526.9 Australian Metallurgical Mining 232.5 280.4 682.8 924.6 Australian Thermal Mining 197.9 205.3 561.4 615.2 Trading and Brokerage (19.2 ) 24.5 (32.6 ) 42.7 Corporate and Other 2.9 7.0 14.1 24.6 Total $ 1,207.1 $ 1,418.9 $ 3,274.5 $ 4,296.1 Adjusted EBITDA: Powder River Basin Mining $ 123.9 $ 120.0 $ 278.3 $ 354.7 Midwestern U.S. Mining 59.1 72.3 172.4 218.6 Western U.S. Mining 34.3 45.7 83.2 147.7 Australian Metallurgical Mining (34.5 ) (15.4 ) (121.0 ) (2.2 ) Australian Thermal Mining 48.9 49.4 137.2 153.9 Trading and Brokerage (31.3 ) 29.4 (90.4 ) 30.4 Corporate and Other (1) (92.1 ) (172.4 ) (270.8 ) (521.5 ) Total $ 108.3 $ 129.0 $ 188.9 $ 381.6 (1) Includes a gain of $68.1 million during the nine months ended September 30, 2016 related to the 2016 Settlement Agreement described in Note 20 "Matters related to the Bankruptcy of Patriot Coal Corporation"
Reconciliation of Adjusted EBITDA to consolidated loss from continuing operations, net of income taxes	A reconciliation of Adjusted EBITDA to consolidated loss from continuing operations, net of income taxes follows: Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 (Dollars in millions) Total Adjusted EBITDA $ 108.3 $ 129.0 $ 188.9 $ 381.6 Depreciation, depletion and amortization (117.8 ) (136.0 ) (345.5 ) (430.6 ) Asset impairment — — (17.2 ) (900.8 ) Asset retirement obligation expenses (12.7 ) (12.3 ) (37.3 ) (40.4 ) Selling and administrative expenses related to debt restructuring — — (21.5 ) — Change in deferred tax asset valuation allowance related to equity affiliates 0.6 (0.4 ) 0.6 0.4 Amortization of basis difference related to equity affiliates — (0.7 ) — (4.2 ) Interest expense (58.5 ) (118.5 ) (243.7 ) (344.0 ) Loss on early debt extinguishment — — — (67.8 ) Interest income 1.3 1.4 4.0 6.6 Reorganization items, net (29.7 ) — (125.1 ) — Income tax benefit (provision) 12.9 (6.9 ) 108.7 83.2 Loss from continuing operations, net of income taxes $ (95.6 ) $ (144.4 ) $ (488.1 ) $ (1,316.0 )

Supplemental Guarantor_Non-Gu51

Supplemental Guarantor/Non-Guarantor Financial Information (Tables)	9 Months Ended
	Sep. 30, 2016
Supplemental Consolidated Statements Of Operations [Table Text Block]	Unaudited Supplemental Condensed Consolidating Statements of Operations Three Months Ended September 30, 2016 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated (Dollars in millions) Total revenues $ — $ 800.7 $ 497.0 $ (90.6 ) $ 1,207.1 Costs and expenses Operating costs and expenses (exclusive of items shown separately below) 47.4 598.7 509.3 (90.6 ) 1,064.8 Depreciation, depletion and amortization — 55.9 61.9 — 117.8 Asset retirement obligation expenses — 5.4 7.3 — 12.7 Selling and administrative expenses 3.7 23.4 5.0 — 32.1 Restructuring charges — 0.1 0.2 — 0.3 Other operating (income) loss: Net gain on disposal of assets — (1.8 ) (0.1 ) — (1.9 ) (Income) loss from equity affiliates and investment in subsidiaries (14.0 ) 0.7 2.2 14.0 2.9 Interest expense 56.1 4.7 6.5 (8.8 ) 58.5 Interest income — (1.2 ) (8.9 ) 8.8 (1.3 ) Reorganization items, net (0.8 ) 29.7 0.8 — 29.7 (Loss) income from continuing operations before income taxes (92.4 ) 85.1 (87.2 ) (14.0 ) (108.5 ) Income tax provision (benefit) 6.2 (23.7 ) 4.6 — (12.9 ) (Loss) income from continuing operations, net of income taxes (98.6 ) 108.8 (91.8 ) (14.0 ) (95.6 ) Loss from discontinued operations, net of income taxes (36.9 ) (0.3 ) (0.9 ) — (38.1 ) Net (loss) income (135.5 ) 108.5 (92.7 ) (14.0 ) (133.7 ) Less: Net income attributable to noncontrolling interests — — 1.8 — 1.8 Net (loss) income attributable to common stockholders $ (135.5 ) $ 108.5 $ (94.5 ) $ (14.0 ) $ (135.5 ) Unaudited Supplemental Condensed Consolidating Statements of Operations Nine Months Ended September 30, 2016 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated (Dollars in millions) Total revenues $ — $ 2,087.2 $ 1,421.6 $ (234.3 ) $ 3,274.5 Costs and expenses Operating costs and expenses (exclusive of items shown separately below) 129.7 1,597.3 1,488.5 (234.3 ) 2,981.2 Depreciation, depletion and amortization — 157.6 187.9 — 345.5 Asset retirement obligation expenses — 17.3 20.0 — 37.3 Selling and administrative expenses 8.8 95.8 10.0 — 114.6 Restructuring charges — 11.9 3.6 — 15.5 Other operating (income) loss: Net gain on disposal of assets — (14.5 ) (2.9 ) — (17.4 ) Asset impairment — — 17.2 — 17.2 Loss from equity affiliates and investment in subsidiaries 89.8 2.8 9.8 (89.8 ) 12.6 Interest expense 234.5 15.1 19.3 (25.2 ) 243.7 Interest income (0.2 ) (3.2 ) (25.8 ) 25.2 (4.0 ) Reorganization items, net 74.1 47.8 3.2 — 125.1 (Loss) income from continuing operations before income taxes (536.7 ) 159.3 (309.2 ) 89.8 (596.8 ) Income tax (benefit) provision (41.8 ) (70.5 ) 3.6 — (108.7 ) (Loss) income from continuing operations, net of income taxes (494.9 ) 229.8 (312.8 ) 89.8 (488.1 ) Loss from discontinued operations, net of income taxes (41.2 ) (1.4 ) (1.9 ) — (44.5 ) Net (loss) income (536.1 ) 228.4 (314.7 ) 89.8 (532.6 ) Less: Net income attributable to noncontrolling interests — — 3.5 — 3.5 Net (loss) income attributable to common stockholders $ (536.1 ) $ 228.4 $ (318.2 ) $ 89.8 $ (536.1 ) Unaudited Supplemental Condensed Consolidating Statements of Operations Three Months Ended September 30, 2015 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated (Dollars in millions) Total revenues $ — $ 902.4 $ 640.4 $ (123.9 ) $ 1,418.9 Costs and expenses Operating costs and expenses (exclusive of items shown separately below) 116.8 710.6 550.5 (123.9 ) 1,254.0 Depreciation, depletion and amortization — 62.0 74.0 — 136.0 Asset retirement obligation expenses — 4.2 8.1 — 12.3 Selling and administrative expenses 6.5 28.6 2.7 — 37.8 Restructuring charges — 0.8 1.0 — 1.8 Other operating loss (income): Net loss (gain) on disposal of assets 0.1 (6.6 ) (1.4 ) — (7.9 ) (Income) loss from equity affiliates and investment in subsidiaries (100.7 ) 1.8 3.5 100.7 5.3 Interest expense 120.4 4.4 2.4 (8.7 ) 118.5 Interest income (0.1 ) (0.5 ) (9.5 ) 8.7 (1.4 ) (Loss) income from continuing operations before income taxes (143.0 ) 97.1 9.1 (100.7 ) (137.5 ) Income tax provision 4.6 1.8 0.5 — 6.9 (Loss) income from continuing operations, net of income taxes (147.6 ) 95.3 8.6 (100.7 ) (144.4 ) Loss from discontinued operations, net of income taxes (157.1 ) (0.3 ) (0.1 ) — (157.5 ) Net (loss) income (304.7 ) 95.0 8.5 (100.7 ) (301.9 ) Less: Net (loss) income attributable to noncontrolling interests — (0.2 ) 3.0 — 2.8 Net (loss) income attributable to common stockholders $ (304.7 ) $ 95.2 $ 5.5 $ (100.7 ) $ (304.7 ) Unaudited Supplemental Condensed Consolidating Statements of Operations Nine Months Ended September 30, 2015 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated (Dollars in millions) Total revenues $ — $ 2,699.7 $ 1,951.1 $ (354.7 ) $ 4,296.1 Costs and expenses Operating costs and expenses (exclusive of items shown separately below) 326.9 2,109.8 1,692.4 (354.7 ) 3,774.4 Depreciation, depletion and amortization — 189.2 241.4 — 430.6 Asset retirement obligation expenses — 13.9 26.5 — 40.4 Selling and administrative expenses 24.3 95.3 9.2 — 128.8 Restructuring charges (3.9 ) 11.0 15.9 — 23.0 Other operating (income) loss: Net gain on disposal of assets (2.3 ) (16.9 ) (1.0 ) — (20.2 ) Asset impairment — 182.2 718.6 — 900.8 Loss from equity affiliates and investment in subsidiaries 594.9 4.7 7.6 (594.9 ) 12.3 Interest expense 348.3 13.5 7.9 (25.7 ) 344.0 Loss on early debt extinguishment 67.8 — — — 67.8 Interest income (0.5 ) (1.8 ) (30.0 ) 25.7 (6.6 ) (Loss) income from continuing operations before income taxes (1,355.5 ) 98.8 (737.4 ) 594.9 (1,399.2 ) Income tax (benefit) provision (20.6 ) (63.0 ) 0.4 — (83.2 ) (Loss) income from continuing operations, net of income taxes (1,334.9 ) 161.8 (737.8 ) 594.9 (1,316.0 ) Loss from discontinued operations, net of income taxes (191.7 ) (2.2 ) (8.8 ) — (202.7 ) Net (loss) income (1,526.6 ) 159.6 (746.6 ) 594.9 (1,518.7 ) Less: Net income attributable to noncontrolling interests — 0.5 7.4 — 7.9 Net (loss) income attributable to common stockholders $ (1,526.6 ) $ 159.1 $ (754.0 ) $ 594.9 $ (1,526.6 ) The Period April 13 through September 30, 2016 Debtors Non-Debtors Eliminations Consolidated (Dollars in millions) Total revenues $ 1,331.3 $ 795.2 $ (2.6 ) $ 2,123.9 Costs and expenses Operating costs and expenses (exclusive of items shown separately below) 1,069.1 843.0 (2.6 ) 1,909.5 Depreciation, depletion and amortization 111.6 105.2 — 216.8 Asset retirement obligation expenses 12.5 9.9 — 22.4 Selling and administrative expenses 46.7 5.2 — 51.9 Restructuring charges 2.2 0.6 — 2.8 Other operating (income) loss: Net gain on disposal of assets (12.8 ) (2.8 ) — (15.6 ) Loss from equity affiliates and investment in subsidiaries 189.6 1.2 (188.2 ) 2.6 Interest expense 89.5 12.0 (6.0 ) 95.5 Interest income (2.1 ) (6.2 ) 6.0 (2.3 ) Reorganization items, net 121.8 3.3 — 125.1 Loss from continuing operations before income taxes (296.8 ) (176.2 ) 188.2 (284.8 ) Income tax (benefit) provision (38.5 ) 7.6 — (30.9 ) Loss from continuing operations, net of income taxes (258.3 ) (183.8 ) 188.2 (253.9 ) Loss from discontinued operations, net of income taxes (39.6 ) (0.9 ) — (40.5 ) Net loss (297.9 ) (184.7 ) 188.2 (294.4 ) Less: Net income attributable to noncontrolling interests — 3.5 — 3.5 Net loss attributable to common stockholders $ (297.9 ) $ (188.2 ) $ 188.2 $ (297.9 ) Three Months Ended September 30, 2016 Debtors Non-Debtors Eliminations Consolidated (Dollars in millions) Total revenues $ 793.1 $ 415.4 $ (1.4 ) $ 1,207.1 Costs and expenses Operating costs and expenses (exclusive of items shown separately below) 631.6 434.6 (1.4 ) 1,064.8 Depreciation, depletion and amortization 61.9 55.9 — 117.8 Asset retirement obligation expenses 7.3 5.4 — 12.7 Selling and administrative expenses 27.2 4.9 — 32.1 Restructuring charges 0.2 0.1 — 0.3 Other operating (income) loss: Net gain on disposal of assets (1.9 ) — — (1.9 ) Loss from equity affiliates and investment in subsidiaries 97.8 2.3 (97.2 ) 2.9 Interest expense 55.7 6.5 (3.7 ) 58.5 Interest income (1.2 ) (3.8 ) 3.7 (1.3 ) Reorganization items, net 28.8 0.9 — 29.7 Loss from continuing operations before income taxes (114.3 ) (91.4 ) 97.2 (108.5 ) Income tax (benefit) provision (16.0 ) 3.1 — (12.9 ) Loss from continuing operations, net of income taxes (98.3 ) (94.5 ) 97.2 (95.6 ) Loss from discontinued operations, net of income taxes (37.2 ) (0.9 ) — (38.1 ) Net loss (135.5 ) (95.4 ) 97.2 (133.7 ) Less: Net income attributable to noncontrolling interests — 1.8 — 1.8 Net loss attributable to common stockholders $ (135.5 ) $ (97.2 ) $ 97.2 $ (135.5 )
Supplemental Guarantor Non Guarantor Financial Information Disclosure [Text Block]	Supplemental Financial Information Guarantor / Non-Guarantor In accordance with the indentures governing the Senior Notes, certain 100% owned U.S. subsidiaries of the Company (each, a Guarantor Subsidiary) have fully and unconditionally guaranteed the Senior Notes, on a joint and several basis. The indentures governing the Senior Notes contain customary exceptions under which a guarantee of a Guarantor Subsidiary will terminate, including (a) the release or discharge of the guarantee of the Company’s 2013 Credit Facility by such Guarantor Subsidiary, except a discharge or release by or as a result of payment under such guarantee, (b) a sale or other disposition, by way of merger, consolidation or otherwise, of all of the capital stock of such Guarantor Subsidiary, and (c) the legal defeasance or discharge of the indentures. Separate financial statements and other disclosures concerning the Guarantor Subsidiaries are not presented because management believes that such information is not material to the holders of the Senior Notes. The following historical financial statement information is provided for the Guarantor/Non-Guarantor Subsidiaries. Three Months Ended September 30, 2016 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated (Dollars in millions) Total revenues $ — $ 800.7 $ 497.0 $ (90.6 ) $ 1,207.1 Costs and expenses Operating costs and expenses (exclusive of items shown separately below) 47.4 598.7 509.3 (90.6 ) 1,064.8 Depreciation, depletion and amortization — 55.9 61.9 — 117.8 Asset retirement obligation expenses — 5.4 7.3 — 12.7 Selling and administrative expenses 3.7 23.4 5.0 — 32.1 Restructuring charges — 0.1 0.2 — 0.3 Other operating (income) loss: Net gain on disposal of assets — (1.8 ) (0.1 ) — (1.9 ) (Income) loss from equity affiliates and investment in subsidiaries (14.0 ) 0.7 2.2 14.0 2.9 Interest expense 56.1 4.7 6.5 (8.8 ) 58.5 Interest income — (1.2 ) (8.9 ) 8.8 (1.3 ) Reorganization items, net (0.8 ) 29.7 0.8 — 29.7 (Loss) income from continuing operations before income taxes (92.4 ) 85.1 (87.2 ) (14.0 ) (108.5 ) Income tax provision (benefit) 6.2 (23.7 ) 4.6 — (12.9 ) (Loss) income from continuing operations, net of income taxes (98.6 ) 108.8 (91.8 ) (14.0 ) (95.6 ) Loss from discontinued operations, net of income taxes (36.9 ) (0.3 ) (0.9 ) — (38.1 ) Net (loss) income (135.5 ) 108.5 (92.7 ) (14.0 ) (133.7 ) Less: Net income attributable to noncontrolling interests — — 1.8 — 1.8 Net (loss) income attributable to common stockholders $ (135.5 ) $ 108.5 $ (94.5 ) $ (14.0 ) $ (135.5 ) Unaudited Supplemental Condensed Consolidating Statements of Comprehensive Income Three Months Ended September 30, 2016 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated (Dollars in millions) Net (loss) income $ (135.5 ) $ 108.5 $ (92.7 ) $ (14.0 ) $ (133.7 ) Other comprehensive income, net of income taxes 35.0 5.1 1.5 (6.6 ) 35.0 Comprehensive (loss) income (100.5 ) 113.6 (91.2 ) (20.6 ) (98.7 ) Less: Comprehensive income attributable to noncontrolling interests — — 1.8 — 1.8 Comprehensive (loss) income attributable to common stockholders $ (100.5 ) $ 113.6 $ (93.0 ) $ (20.6 ) $ (100.5 ) Unaudited Supplemental Condensed Consolidating Statements of Operations Three Months Ended September 30, 2015 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated (Dollars in millions) Total revenues $ — $ 902.4 $ 640.4 $ (123.9 ) $ 1,418.9 Costs and expenses Operating costs and expenses (exclusive of items shown separately below) 116.8 710.6 550.5 (123.9 ) 1,254.0 Depreciation, depletion and amortization — 62.0 74.0 — 136.0 Asset retirement obligation expenses — 4.2 8.1 — 12.3 Selling and administrative expenses 6.5 28.6 2.7 — 37.8 Restructuring charges — 0.8 1.0 — 1.8 Other operating loss (income): Net loss (gain) on disposal of assets 0.1 (6.6 ) (1.4 ) — (7.9 ) (Income) loss from equity affiliates and investment in subsidiaries (100.7 ) 1.8 3.5 100.7 5.3 Interest expense 120.4 4.4 2.4 (8.7 ) 118.5 Interest income (0.1 ) (0.5 ) (9.5 ) 8.7 (1.4 ) (Loss) income from continuing operations before income taxes (143.0 ) 97.1 9.1 (100.7 ) (137.5 ) Income tax provision 4.6 1.8 0.5 — 6.9 (Loss) income from continuing operations, net of income taxes (147.6 ) 95.3 8.6 (100.7 ) (144.4 ) Loss from discontinued operations, net of income taxes (157.1 ) (0.3 ) (0.1 ) — (157.5 ) Net (loss) income (304.7 ) 95.0 8.5 (100.7 ) (301.9 ) Less: Net (loss) income attributable to noncontrolling interests — (0.2 ) 3.0 — 2.8 Net (loss) income attributable to common stockholders $ (304.7 ) $ 95.2 $ 5.5 $ (100.7 ) $ (304.7 ) Unaudited Supplemental Condensed Consolidating Statements of Comprehensive Income Three Months Ended September 30, 2015 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated (Dollars in millions) Net (loss) income $ (304.7 ) $ 95.0 $ 8.5 $ (100.7 ) $ (301.9 ) Other comprehensive (loss) income, net of income taxes (51.0 ) 12.1 (26.9 ) 14.8 (51.0 ) Comprehensive (loss) income (355.7 ) 107.1 (18.4 ) (85.9 ) (352.9 ) Less: Comprehensive (loss) income attributable to noncontrolling interests — (0.2 ) 3.0 — 2.8 Comprehensive (loss) income attributable to common stockholders $ (355.7 ) $ 107.3 $ (21.4 ) $ (85.9 ) $ (355.7 ) Unaudited Supplemental Condensed Consolidating Statements of Operations Nine Months Ended September 30, 2016 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated (Dollars in millions) Total revenues $ — $ 2,087.2 $ 1,421.6 $ (234.3 ) $ 3,274.5 Costs and expenses Operating costs and expenses (exclusive of items shown separately below) 129.7 1,597.3 1,488.5 (234.3 ) 2,981.2 Depreciation, depletion and amortization — 157.6 187.9 — 345.5 Asset retirement obligation expenses — 17.3 20.0 — 37.3 Selling and administrative expenses 8.8 95.8 10.0 — 114.6 Restructuring charges — 11.9 3.6 — 15.5 Other operating (income) loss: Net gain on disposal of assets — (14.5 ) (2.9 ) — (17.4 ) Asset impairment — — 17.2 — 17.2 Loss from equity affiliates and investment in subsidiaries 89.8 2.8 9.8 (89.8 ) 12.6 Interest expense 234.5 15.1 19.3 (25.2 ) 243.7 Interest income (0.2 ) (3.2 ) (25.8 ) 25.2 (4.0 ) Reorganization items, net 74.1 47.8 3.2 — 125.1 (Loss) income from continuing operations before income taxes (536.7 ) 159.3 (309.2 ) 89.8 (596.8 ) Income tax (benefit) provision (41.8 ) (70.5 ) 3.6 — (108.7 ) (Loss) income from continuing operations, net of income taxes (494.9 ) 229.8 (312.8 ) 89.8 (488.1 ) Loss from discontinued operations, net of income taxes (41.2 ) (1.4 ) (1.9 ) — (44.5 ) Net (loss) income (536.1 ) 228.4 (314.7 ) 89.8 (532.6 ) Less: Net income attributable to noncontrolling interests — — 3.5 — 3.5 Net (loss) income attributable to common stockholders $ (536.1 ) $ 228.4 $ (318.2 ) $ 89.8 $ (536.1 ) Unaudited Supplemental Condensed Consolidating Statements of Comprehensive Income Nine Months Ended September 30, 2016 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated (Dollars in millions) Net (loss) income $ (536.1 ) $ 228.4 $ (314.7 ) $ 89.8 $ (532.6 ) Other comprehensive income, net of income taxes 132.2 15.4 2.4 (17.8 ) 132.2 Comprehensive (loss) income (403.9 ) 243.8 (312.3 ) 72.0 (400.4 ) Less: Comprehensive income attributable to noncontrolling interests — — 3.5 — 3.5 Comprehensive (loss) income attributable to common stockholders $ (403.9 ) $ 243.8 $ (315.8 ) $ 72.0 $ (403.9 ) Unaudited Supplemental Condensed Consolidating Statements of Operations Nine Months Ended September 30, 2015 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated (Dollars in millions) Total revenues $ — $ 2,699.7 $ 1,951.1 $ (354.7 ) $ 4,296.1 Costs and expenses Operating costs and expenses (exclusive of items shown separately below) 326.9 2,109.8 1,692.4 (354.7 ) 3,774.4 Depreciation, depletion and amortization — 189.2 241.4 — 430.6 Asset retirement obligation expenses — 13.9 26.5 — 40.4 Selling and administrative expenses 24.3 95.3 9.2 — 128.8 Restructuring charges (3.9 ) 11.0 15.9 — 23.0 Other operating (income) loss: Net gain on disposal of assets (2.3 ) (16.9 ) (1.0 ) — (20.2 ) Asset impairment — 182.2 718.6 — 900.8 Loss from equity affiliates and investment in subsidiaries 594.9 4.7 7.6 (594.9 ) 12.3 Interest expense 348.3 13.5 7.9 (25.7 ) 344.0 Loss on early debt extinguishment 67.8 — — — 67.8 Interest income (0.5 ) (1.8 ) (30.0 ) 25.7 (6.6 ) (Loss) income from continuing operations before income taxes (1,355.5 ) 98.8 (737.4 ) 594.9 (1,399.2 ) Income tax (benefit) provision (20.6 ) (63.0 ) 0.4 — (83.2 ) (Loss) income from continuing operations, net of income taxes (1,334.9 ) 161.8 (737.8 ) 594.9 (1,316.0 ) Loss from discontinued operations, net of income taxes (191.7 ) (2.2 ) (8.8 ) — (202.7 ) Net (loss) income (1,526.6 ) 159.6 (746.6 ) 594.9 (1,518.7 ) Less: Net income attributable to noncontrolling interests — 0.5 7.4 — 7.9 Net (loss) income attributable to common stockholders $ (1,526.6 ) $ 159.1 $ (754.0 ) $ 594.9 $ (1,526.6 ) Unaudited Supplemental Condensed Consolidating Statements of Comprehensive Income Nine Months Ended September 30, 2015 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated (Dollars in millions) Net (loss) income $ (1,526.6 ) $ 159.6 $ (746.6 ) $ 594.9 $ (1,518.7 ) Other comprehensive income (loss), net of income taxes 69.0 31.1 (67.7 ) 36.6 69.0 Comprehensive (loss) income (1,457.6 ) 190.7 (814.3 ) 631.5 (1,449.7 ) Less: Comprehensive income attributable to noncontrolling interests — 0.5 7.4 — 7.9 Comprehensive (loss) income attributable to common stockholders $ (1,457.6 ) $ 190.2 $ (821.7 ) $ 631.5 $ (1,457.6 ) Unaudited Supplemental Condensed Consolidating Balance Sheets September 30, 2016 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Reclassifications/ Eliminations Consolidated (Dollars in millions) Assets Current assets Cash and cash equivalents $ 687.5 $ 3.1 $ 477.2 $ — $ 1,167.8 Restricted cash 1.4 — 22.8 — 24.2 Accounts receivable, net — 22.4 329.5 — 351.9 Receivables from affiliates, net 1,035.2 — 633.4 (1,668.6 ) — Inventories — 86.7 172.9 — 259.6 Assets from coal trading activities, net — 0.1 19.8 — 19.9 Deferred income taxes — 65.3 — (11.8 ) 53.5 Other current assets 22.1 107.9 238.9 — 368.9 Total current assets 1,746.2 285.5 1,894.5 (1,680.4 ) 2,245.8 Property, plant, equipment and mine development, net — 4,419.3 4,796.2 — 9,215.5 Deferred income taxes — 63.2 2.3 (63.2 ) 2.3 Investments and other assets 8,761.5 3.7 501.1 (8,494.7 ) 771.6 Notes receivable from affiliates, net — 877.0 155.6 (1,032.6 ) — Total assets $ 10,507.7 $ 5,648.7 $ 7,349.7 $ (11,270.9 ) $ 12,235.2 Liabilities and Stockholders’ Equity Current liabilities Current portion of long-term debt $ 470.5 $ 20.5 $ 2.1 $ — $ 493.1 Payables to affiliates, net — 1,668.6 — (1,668.6 ) — Deferred income taxes 11.8 — 4.1 (11.8 ) 4.1 Liabilities from coal trading activities, net — 0.1 19.4 — 19.5 Accounts payable and accrued expenses 47.5 380.6 403.7 — 831.8 Total current liabilities 529.8 2,069.8 429.3 (1,680.4 ) 1,348.5 Deferred income taxes 165.8 — 5.0 (63.2 ) 107.6 Notes payable to affiliates, net 1,032.6 — — (1,032.6 ) — Other noncurrent liabilities 154.8 1,277.7 491.1 — 1,923.6 Total liabilities not subject to compromise 1,883.0 3,347.5 925.4 (2,776.2 ) 3,379.7 Liabilities subject to compromise 8,104.0 209.0 18.6 — 8,331.6 Total liabilities 9,987.0 3,556.5 944.0 (2,776.2 ) 11,711.3 Peabody Energy Corporation stockholders’ equity 520.7 2,092.2 6,402.5 (8,494.7 ) 520.7 Noncontrolling interests — — 3.2 — 3.2 Total stockholders’ equity 520.7 2,092.2 6,405.7 (8,494.7 ) 523.9 Total liabilities and stockholders’ equity $ 10,507.7 $ 5,648.7 $ 7,349.7 $ (11,270.9 ) $ 12,235.2 Unaudited Supplemental Condensed Consolidating Balance Sheets December 31, 2015 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Reclassifications/ Eliminations Consolidated (Dollars in millions) Assets Current assets Cash and cash equivalents $ 7.2 $ 4.7 $ 249.4 $ — $ 261.3 Accounts receivable, net — 12.1 216.7 — 228.8 Receivables from affiliates, net 582.1 — 948.1 (1,530.2 ) — Inventories — 109.4 198.4 — 307.8 Assets from coal trading activities, net — 3.2 20.3 — 23.5 Deferred income taxes — 65.3 — (11.8 ) 53.5 Other current assets 23.1 128.1 296.4 — 447.6 Total current assets 612.4 322.8 1,929.3 (1,542.0 ) 1,322.5 Property, plant, equipment and mine development, net — 4,304.8 4,953.7 — 9,258.5 Deferred income taxes — 33.1 — (30.9 ) 2.2 Investments and other assets 8,476.2 3.6 185.5 (8,301.6 ) 363.7 Notes receivable from affiliates, net — 632.7 399.9 (1,032.6 ) — Total assets $ 9,088.6 $ 5,297.0 $ 7,468.4 $ (10,907.1 ) $ 10,946.9 Liabilities and Stockholders’ Equity Current liabilities Current portion of long-term debt $ 5,844.0 $ 23.8 $ 7.1 $ — $ 5,874.9 Payables to affiliates, net — 1,530.2 — (1,530.2 ) — Deferred income taxes 11.8 — 3.8 (11.8 ) 3.8 Liabilities from coal trading activities, net — 4.8 10.8 — 15.6 Accounts payable and accrued expenses 494.8 479.8 467.9 — 1,442.5 Total current liabilities 6,350.6 2,038.6 489.6 (1,542.0 ) 7,336.8 Long-term debt, less current portion 366.3 — — — 366.3 Deferred income taxes 98.6 — 1.4 (30.9 ) 69.1 Notes payable to affiliates, net 1,032.6 — — (1,032.6 ) — Other noncurrent liabilities 323.6 1,454.9 477.7 — 2,256.2 Total liabilities 8,171.7 3,493.5 968.7 (2,605.5 ) 10,028.4 Peabody Energy Corporation stockholders’ equity 916.9 1,803.5 6,498.1 (8,301.6 ) 916.9 Noncontrolling interests — — 1.6 — 1.6 Total stockholders’ equity 916.9 1,803.5 6,499.7 (8,301.6 ) 918.5 Total liabilities and stockholders’ equity $ 9,088.6 $ 5,297.0 $ 7,468.4 $ (10,907.1 ) $ 10,946.9 Unaudited Supplemental Condensed Consolidating Statements of Cash Flows Nine Months Ended September 30, 2016 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Consolidated (Dollars in millions) Cash Flows From Operating Activities Net cash (used in) provided by continuing operations $ (249.9 ) $ 89.3 $ (97.3 ) $ (257.9 ) Net cash used in discontinued operations (5.1 ) (13.1 ) (0.7 ) (18.9 ) Net cash (used in) provided by operating activities (255.0 ) 76.2 (98.0 ) (276.8 ) Cash Flows From Investing Activities Additions to property, plant, equipment and mine development — (26.3 ) (30.3 ) (56.6 ) Changes in accrued expenses related to capital expenditures — (1.1 ) (4.4 ) (5.5 ) Federal coal lease expenditures — (249.0 ) — (249.0 ) Proceeds from disposal of assets, net of notes receivable — 68.4 66.3 134.7 Contributions to joint ventures — — (241.7 ) (241.7 ) Distributions from joint ventures — — 236.7 236.7 Advances to related parties — — (23.3 ) (23.3 ) Repayments of loans from related parties — — 13.2 13.2 Other, net — (4.6 ) (3.6 ) (8.2 ) Net cash (used in) provided by investing activities — (212.6 ) 12.9 (199.7 ) Cash Flows From Financing Activities Proceeds from long-term debt 1,422.0 — 7.8 1,429.8 Repayments of long-term debt (3.0 ) (3.3 ) (4.9 ) (11.2 ) Payment of deferred financing costs (25.6 ) — (4.2 ) (29.8 ) Distributions to noncontrolling interests — — (3.9 ) (3.9 ) Other, net — (1.9 ) — (1.9 ) Transactions with affiliates, net (458.1 ) 140.0 318.1 — Net cash provided by financing activities 935.3 134.8 312.9 1,383.0 Net change in cash and cash equivalents 680.3 (1.6 ) 227.8 906.5 Cash and cash equivalents at beginning of period 7.2 4.7 249.4 261.3 Cash and cash equivalents at end of period $ 687.5 $ 3.1 $ 477.2 $ 1,167.8 Unaudited Supplemental Condensed Consolidating Statements of Cash Flows Nine Months Ended September 30, 2015 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Consolidated (Dollars in millions) Cash Flows From Operating Activities Net cash (used in) provided by continuing operations $ (649.0 ) $ 437.0 $ 150.0 $ (62.0 ) Net cash used in discontinued operations (23.2 ) (2.8 ) (2.6 ) (28.6 ) Net cash (used in) provided by operating activities (672.2 ) 434.2 147.4 (90.6 ) Cash Flows From Investing Activities Additions to property, plant, equipment and mine development — (44.8 ) (32.1 ) (76.9 ) Changes in accrued expenses related to capital expenditures — (3.4 ) (11.1 ) (14.5 ) Federal coal lease expenditures — (89.8 ) — (89.8 ) Proceeds from disposal of assets, net of notes receivable — 7.6 32.0 39.6 Purchases of debt and equity securities — — (22.6 ) (22.6 ) Proceeds from sales and maturities of debt and equity securities — — 33.6 33.6 Contributions to joint ventures — — (349.8 ) (349.8 ) Distributions from joint ventures — — 339.8 339.8 Advances to related parties — — (3.6 ) (3.6 ) Other, net — (1.8 ) (0.3 ) (2.1 ) Net cash used in investing activities — (132.2 ) (14.1 ) (146.3 ) Cash Flows From Financing Activities Proceeds from long-term debt 975.7 — — 975.7 Repayments of long-term debt (659.0 ) (0.6 ) (6.4 ) (666.0 ) Payment of deferred financing costs (28.7 ) — — (28.7 ) Dividends paid (1.4 ) — — (1.4 ) Distributions to noncontrolling interests — — (2.1 ) (2.1 ) Other, net 1.4 (1.6 ) (4.1 ) (4.3 ) Transactions with affiliates, net 339.7 (299.2 ) (40.5 ) — Net cash provided by (used in) financing activities 627.7 (301.4 ) (53.1 ) 273.2 Net change in cash and cash equivalents (44.5 ) 0.6 80.2 36.3 Cash and cash equivalents at beginning of period 188.7 3.6 105.7 298.0 Cash and cash equivalents at end of period $ 144.2 $ 4.2 $ 185.9 $ 334.3 Unaudited Supplemental Condensed Consolidating Balance Sheets September 30, 2016 Debtors Non-Debtors Reclassifications/Eliminations Consolidated (Dollars in millions) Assets Current assets Cash and cash equivalents $ 702.1 $ 465.7 $ — $ 1,167.8 Restricted cash 1.4 22.8 — 24.2 Accounts receivable, net 22.5 329.4 — 351.9 Receivables from affiliates, net 387.4 — (387.4 ) — Inventories 118.4 141.2 — 259.6 Assets from coal trading activities, net 0.1 19.8 — 19.9 Deferred income taxes 53.4 0.1 — 53.5 Other current assets 130.1 238.8 — 368.9 Total current assets 1,415.4 1,217.8 (387.4 ) 2,245.8 Property, plant, equipment and mine development, net 4,906.1 4,309.4 — 9,215.5 Deferred income taxes — 2.3 — 2.3 Investments and other assets 4,307.9 471.0 (4,007.3 ) 771.6 Notes receivable from affiliates, net 877.0 — (877.0 ) — Total assets $ 11,506.4 $ 6,000.5 $ (5,271.7 ) $ 12,235.2 Liabilities and Stockholders’ Equity Current liabilities Current portion of long-term debt $ 491.0 $ 2.1 $ — $ 493.1 Payables to affiliates, net — 387.4 (387.4 ) — Liabilities from coal trading activities, net 0.1 19.4 — 19.5 Accounts payable and accrued expenses 463.0 372.9 — 835.9 Total current liabilities 954.1 781.8 (387.4 ) 1,348.5 Deferred income taxes 102.7 4.9 — 107.6 Notes payable to affiliates, net — 877.0 (877.0 ) — Other noncurrent liabilities 1,597.3 326.3 — 1,923.6 Total liabilities not subject to compromise 2,654.1 1,990.0 (1,264.4 ) 3,379.7 Liabilities subject to compromise 8,331.6 — — 8,331.6 Total liabilities 10,985.7 1,990.0 (1,264.4 ) 11,711.3 Peabody Energy Corporation stockholders’ equity 520.7 4,007.3 (4,007.3 ) 520.7 Noncontrolling interests — 3.2 — 3.2 Total stockholders’ equity 520.7 4,010.5 (4,007.3 ) 523.9 Total liabilities and stockholders’ equity $ 11,506.4 $ 6,000.5 $ (5,271.7 ) $ 12,235.2 Unaudited Supplemental Condensed Consolidating Statements of Cash Flows The Period April 13 through September 30, 2016 Debtors Non-Debtors Consolidated (Dollars in millions) Cash Flows From Operating Activities Net cash provided by (used in) continuing operations $ 376.4 $ (121.5 ) $ 254.9 Net cash used in discontinued operations (5.8 ) (12.4 ) (18.2 ) Net cash provided by (used in) operating activities 370.6 (133.9 ) 236.7 Cash Flows From Investing Activities Additions to property, plant, equipment and mine development (26.4 ) (10.3 ) (36.7 ) Changes in accrued expenses related to capital expenditures 0.4 (1.9 ) (1.5 ) Federal coal lease expenditures (248.5 ) — (248.5 ) Proceeds from disposal of assets, net of notes receivable 66.3 66.2 132.5 Contributions to joint ventures — (140.5 ) (140.5 ) Distributions from joint ventures — 139.7 139.7 Advances to related parties — (22.7 ) (22.7 ) Repayments of loans from related parties — 11.9 11.9 Other, net (1.4 ) (1.5 ) (2.9 ) Net cash (used in) provided by investing activities (209.6 ) 40.9 (168.7 ) Cash Flows From Financing Activities Proceeds from long-term debt 475.0 7.8 482.8 Repayments of long-term debt (1.8 ) (2.3 ) (4.1 ) Payment of deferred financing costs (25.6 ) (1.4 ) (27.0 ) Distributions to noncontrolling interests — (3.9 ) (3.9 ) Other, net (0.1 ) — (0.1 ) Transactions with affiliates, net (14.9 ) 14.9 — Net cash provided by financing activities 432.6 15.1 447.7 Net change in cash and cash equivalents 593.6 (77.9 ) 515.7 Cash and cash equivalents at beginning of period 108.5 543.6 652.1 Cash and cash equivalents at end of period $ 702.1 $ 465.7 $ 1,167.8
SupplementalCondensedConsolidatingStatementsOfComprehensiveIncomeLoss [Table Text Block]	Unaudited Supplemental Condensed Consolidating Statements of Comprehensive Income Nine Months Ended September 30, 2015 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated (Dollars in millions) Net (loss) income $ (1,526.6 ) $ 159.6 $ (746.6 ) $ 594.9 $ (1,518.7 ) Other comprehensive income (loss), net of income taxes 69.0 31.1 (67.7 ) 36.6 69.0 Comprehensive (loss) income (1,457.6 ) 190.7 (814.3 ) 631.5 (1,449.7 ) Less: Comprehensive income attributable to noncontrolling interests — 0.5 7.4 — 7.9 Comprehensive (loss) income attributable to common stockholders $ (1,457.6 ) $ 190.2 $ (821.7 ) $ 631.5 $ (1,457.6 ) Unaudited Supplemental Condensed Consolidating Statements of Comprehensive Income Three Months Ended September 30, 2016 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated (Dollars in millions) Net (loss) income $ (135.5 ) $ 108.5 $ (92.7 ) $ (14.0 ) $ (133.7 ) Other comprehensive income, net of income taxes 35.0 5.1 1.5 (6.6 ) 35.0 Comprehensive (loss) income (100.5 ) 113.6 (91.2 ) (20.6 ) (98.7 ) Less: Comprehensive income attributable to noncontrolling interests — — 1.8 — 1.8 Comprehensive (loss) income attributable to common stockholders $ (100.5 ) $ 113.6 $ (93.0 ) $ (20.6 ) $ (100.5 ) Unaudited Supplemental Condensed Consolidating Statements of Comprehensive Income Nine Months Ended September 30, 2016 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated (Dollars in millions) Net (loss) income $ (536.1 ) $ 228.4 $ (314.7 ) $ 89.8 $ (532.6 ) Other comprehensive income, net of income taxes 132.2 15.4 2.4 (17.8 ) 132.2 Comprehensive (loss) income (403.9 ) 243.8 (312.3 ) 72.0 (400.4 ) Less: Comprehensive income attributable to noncontrolling interests — — 3.5 — 3.5 Comprehensive (loss) income attributable to common stockholders $ (403.9 ) $ 243.8 $ (315.8 ) $ 72.0 $ (403.9 ) Unaudited Supplemental Condensed Consolidating Statements of Comprehensive Income Three Months Ended September 30, 2015 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated (Dollars in millions) Net (loss) income $ (304.7 ) $ 95.0 $ 8.5 $ (100.7 ) $ (301.9 ) Other comprehensive (loss) income, net of income taxes (51.0 ) 12.1 (26.9 ) 14.8 (51.0 ) Comprehensive (loss) income (355.7 ) 107.1 (18.4 ) (85.9 ) (352.9 ) Less: Comprehensive (loss) income attributable to noncontrolling interests — (0.2 ) 3.0 — 2.8 Comprehensive (loss) income attributable to common stockholders $ (355.7 ) $ 107.3 $ (21.4 ) $ (85.9 ) $ (355.7 )
Supplemental Consolidated Balance Sheets [Table Text Block]	Unaudited Supplemental Condensed Consolidating Balance Sheets September 30, 2016 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Reclassifications/ Eliminations Consolidated (Dollars in millions) Assets Current assets Cash and cash equivalents $ 687.5 $ 3.1 $ 477.2 $ — $ 1,167.8 Restricted cash 1.4 — 22.8 — 24.2 Accounts receivable, net — 22.4 329.5 — 351.9 Receivables from affiliates, net 1,035.2 — 633.4 (1,668.6 ) — Inventories — 86.7 172.9 — 259.6 Assets from coal trading activities, net — 0.1 19.8 — 19.9 Deferred income taxes — 65.3 — (11.8 ) 53.5 Other current assets 22.1 107.9 238.9 — 368.9 Total current assets 1,746.2 285.5 1,894.5 (1,680.4 ) 2,245.8 Property, plant, equipment and mine development, net — 4,419.3 4,796.2 — 9,215.5 Deferred income taxes — 63.2 2.3 (63.2 ) 2.3 Investments and other assets 8,761.5 3.7 501.1 (8,494.7 ) 771.6 Notes receivable from affiliates, net — 877.0 155.6 (1,032.6 ) — Total assets $ 10,507.7 $ 5,648.7 $ 7,349.7 $ (11,270.9 ) $ 12,235.2 Liabilities and Stockholders’ Equity Current liabilities Current portion of long-term debt $ 470.5 $ 20.5 $ 2.1 $ — $ 493.1 Payables to affiliates, net — 1,668.6 — (1,668.6 ) — Deferred income taxes 11.8 — 4.1 (11.8 ) 4.1 Liabilities from coal trading activities, net — 0.1 19.4 — 19.5 Accounts payable and accrued expenses 47.5 380.6 403.7 — 831.8 Total current liabilities 529.8 2,069.8 429.3 (1,680.4 ) 1,348.5 Deferred income taxes 165.8 — 5.0 (63.2 ) 107.6 Notes payable to affiliates, net 1,032.6 — — (1,032.6 ) — Other noncurrent liabilities 154.8 1,277.7 491.1 — 1,923.6 Total liabilities not subject to compromise 1,883.0 3,347.5 925.4 (2,776.2 ) 3,379.7 Liabilities subject to compromise 8,104.0 209.0 18.6 — 8,331.6 Total liabilities 9,987.0 3,556.5 944.0 (2,776.2 ) 11,711.3 Peabody Energy Corporation stockholders’ equity 520.7 2,092.2 6,402.5 (8,494.7 ) 520.7 Noncontrolling interests — — 3.2 — 3.2 Total stockholders’ equity 520.7 2,092.2 6,405.7 (8,494.7 ) 523.9 Total liabilities and stockholders’ equity $ 10,507.7 $ 5,648.7 $ 7,349.7 $ (11,270.9 ) $ 12,235.2 Unaudited Supplemental Condensed Consolidating Balance Sheets December 31, 2015 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Reclassifications/ Eliminations Consolidated (Dollars in millions) Assets Current assets Cash and cash equivalents $ 7.2 $ 4.7 $ 249.4 $ — $ 261.3 Accounts receivable, net — 12.1 216.7 — 228.8 Receivables from affiliates, net 582.1 — 948.1 (1,530.2 ) — Inventories — 109.4 198.4 — 307.8 Assets from coal trading activities, net — 3.2 20.3 — 23.5 Deferred income taxes — 65.3 — (11.8 ) 53.5 Other current assets 23.1 128.1 296.4 — 447.6 Total current assets 612.4 322.8 1,929.3 (1,542.0 ) 1,322.5 Property, plant, equipment and mine development, net — 4,304.8 4,953.7 — 9,258.5 Deferred income taxes — 33.1 — (30.9 ) 2.2 Investments and other assets 8,476.2 3.6 185.5 (8,301.6 ) 363.7 Notes receivable from affiliates, net — 632.7 399.9 (1,032.6 ) — Total assets $ 9,088.6 $ 5,297.0 $ 7,468.4 $ (10,907.1 ) $ 10,946.9 Liabilities and Stockholders’ Equity Current liabilities Current portion of long-term debt $ 5,844.0 $ 23.8 $ 7.1 $ — $ 5,874.9 Payables to affiliates, net — 1,530.2 — (1,530.2 ) — Deferred income taxes 11.8 — 3.8 (11.8 ) 3.8 Liabilities from coal trading activities, net — 4.8 10.8 — 15.6 Accounts payable and accrued expenses 494.8 479.8 467.9 — 1,442.5 Total current liabilities 6,350.6 2,038.6 489.6 (1,542.0 ) 7,336.8 Long-term debt, less current portion 366.3 — — — 366.3 Deferred income taxes 98.6 — 1.4 (30.9 ) 69.1 Notes payable to affiliates, net 1,032.6 — — (1,032.6 ) — Other noncurrent liabilities 323.6 1,454.9 477.7 — 2,256.2 Total liabilities 8,171.7 3,493.5 968.7 (2,605.5 ) 10,028.4 Peabody Energy Corporation stockholders’ equity 916.9 1,803.5 6,498.1 (8,301.6 ) 916.9 Noncontrolling interests — — 1.6 — 1.6 Total stockholders’ equity 916.9 1,803.5 6,499.7 (8,301.6 ) 918.5 Total liabilities and stockholders’ equity $ 9,088.6 $ 5,297.0 $ 7,468.4 $ (10,907.1 ) $ 10,946.9 Unaudited Supplemental Condensed Consolidating Balance Sheets September 30, 2016 Debtors Non-Debtors Reclassifications/Eliminations Consolidated (Dollars in millions) Assets Current assets Cash and cash equivalents $ 702.1 $ 465.7 $ — $ 1,167.8 Restricted cash 1.4 22.8 — 24.2 Accounts receivable, net 22.5 329.4 — 351.9 Receivables from affiliates, net 387.4 — (387.4 ) — Inventories 118.4 141.2 — 259.6 Assets from coal trading activities, net 0.1 19.8 — 19.9 Deferred income taxes 53.4 0.1 — 53.5 Other current assets 130.1 238.8 — 368.9 Total current assets 1,415.4 1,217.8 (387.4 ) 2,245.8 Property, plant, equipment and mine development, net 4,906.1 4,309.4 — 9,215.5 Deferred income taxes — 2.3 — 2.3 Investments and other assets 4,307.9 471.0 (4,007.3 ) 771.6 Notes receivable from affiliates, net 877.0 — (877.0 ) — Total assets $ 11,506.4 $ 6,000.5 $ (5,271.7 ) $ 12,235.2 Liabilities and Stockholders’ Equity Current liabilities Current portion of long-term debt $ 491.0 $ 2.1 $ — $ 493.1 Payables to affiliates, net — 387.4 (387.4 ) — Liabilities from coal trading activities, net 0.1 19.4 — 19.5 Accounts payable and accrued expenses 463.0 372.9 — 835.9 Total current liabilities 954.1 781.8 (387.4 ) 1,348.5 Deferred income taxes 102.7 4.9 — 107.6 Notes payable to affiliates, net — 877.0 (877.0 ) — Other noncurrent liabilities 1,597.3 326.3 — 1,923.6 Total liabilities not subject to compromise 2,654.1 1,990.0 (1,264.4 ) 3,379.7 Liabilities subject to compromise 8,331.6 — — 8,331.6 Total liabilities 10,985.7 1,990.0 (1,264.4 ) 11,711.3 Peabody Energy Corporation stockholders’ equity 520.7 4,007.3 (4,007.3 ) 520.7 Noncontrolling interests — 3.2 — 3.2 Total stockholders’ equity 520.7 4,010.5 (4,007.3 ) 523.9 Total liabilities and stockholders’ equity $ 11,506.4 $ 6,000.5 $ (5,271.7 ) $ 12,235.2
Supplemental Consolidated Statements Of Cash Flows [Table Text Block]	Unaudited Supplemental Condensed Consolidating Statements of Cash Flows Nine Months Ended September 30, 2016 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Consolidated (Dollars in millions) Cash Flows From Operating Activities Net cash (used in) provided by continuing operations $ (249.9 ) $ 89.3 $ (97.3 ) $ (257.9 ) Net cash used in discontinued operations (5.1 ) (13.1 ) (0.7 ) (18.9 ) Net cash (used in) provided by operating activities (255.0 ) 76.2 (98.0 ) (276.8 ) Cash Flows From Investing Activities Additions to property, plant, equipment and mine development — (26.3 ) (30.3 ) (56.6 ) Changes in accrued expenses related to capital expenditures — (1.1 ) (4.4 ) (5.5 ) Federal coal lease expenditures — (249.0 ) — (249.0 ) Proceeds from disposal of assets, net of notes receivable — 68.4 66.3 134.7 Contributions to joint ventures — — (241.7 ) (241.7 ) Distributions from joint ventures — — 236.7 236.7 Advances to related parties — — (23.3 ) (23.3 ) Repayments of loans from related parties — — 13.2 13.2 Other, net — (4.6 ) (3.6 ) (8.2 ) Net cash (used in) provided by investing activities — (212.6 ) 12.9 (199.7 ) Cash Flows From Financing Activities Proceeds from long-term debt 1,422.0 — 7.8 1,429.8 Repayments of long-term debt (3.0 ) (3.3 ) (4.9 ) (11.2 ) Payment of deferred financing costs (25.6 ) — (4.2 ) (29.8 ) Distributions to noncontrolling interests — — (3.9 ) (3.9 ) Other, net — (1.9 ) — (1.9 ) Transactions with affiliates, net (458.1 ) 140.0 318.1 — Net cash provided by financing activities 935.3 134.8 312.9 1,383.0 Net change in cash and cash equivalents 680.3 (1.6 ) 227.8 906.5 Cash and cash equivalents at beginning of period 7.2 4.7 249.4 261.3 Cash and cash equivalents at end of period $ 687.5 $ 3.1 $ 477.2 $ 1,167.8 Unaudited Supplemental Condensed Consolidating Statements of Cash Flows Nine Months Ended September 30, 2015 Parent Company Guarantor Subsidiaries Non-Guarantor Subsidiaries Consolidated (Dollars in millions) Cash Flows From Operating Activities Net cash (used in) provided by continuing operations $ (649.0 ) $ 437.0 $ 150.0 $ (62.0 ) Net cash used in discontinued operations (23.2 ) (2.8 ) (2.6 ) (28.6 ) Net cash (used in) provided by operating activities (672.2 ) 434.2 147.4 (90.6 ) Cash Flows From Investing Activities Additions to property, plant, equipment and mine development — (44.8 ) (32.1 ) (76.9 ) Changes in accrued expenses related to capital expenditures — (3.4 ) (11.1 ) (14.5 ) Federal coal lease expenditures — (89.8 ) — (89.8 ) Proceeds from disposal of assets, net of notes receivable — 7.6 32.0 39.6 Purchases of debt and equity securities — — (22.6 ) (22.6 ) Proceeds from sales and maturities of debt and equity securities — — 33.6 33.6 Contributions to joint ventures — — (349.8 ) (349.8 ) Distributions from joint ventures — — 339.8 339.8 Advances to related parties — — (3.6 ) (3.6 ) Other, net — (1.8 ) (0.3 ) (2.1 ) Net cash used in investing activities — (132.2 ) (14.1 ) (146.3 ) Cash Flows From Financing Activities Proceeds from long-term debt 975.7 — — 975.7 Repayments of long-term debt (659.0 ) (0.6 ) (6.4 ) (666.0 ) Payment of deferred financing costs (28.7 ) — — (28.7 ) Dividends paid (1.4 ) — — (1.4 ) Distributions to noncontrolling interests — — (2.1 ) (2.1 ) Other, net 1.4 (1.6 ) (4.1 ) (4.3 ) Transactions with affiliates, net 339.7 (299.2 ) (40.5 ) — Net cash provided by (used in) financing activities 627.7 (301.4 ) (53.1 ) 273.2 Net change in cash and cash equivalents (44.5 ) 0.6 80.2 36.3 Cash and cash equivalents at beginning of period 188.7 3.6 105.7 298.0 Cash and cash equivalents at end of period $ 144.2 $ 4.2 $ 185.9 $ 334.3 The Period April 13 through September 30, 2016 Debtors Non-Debtors Consolidated (Dollars in millions) Cash Flows From Operating Activities Net cash provided by (used in) continuing operations $ 376.4 $ (121.5 ) $ 254.9 Net cash used in discontinued operations (5.8 ) (12.4 ) (18.2 ) Net cash provided by (used in) operating activities 370.6 (133.9 ) 236.7 Cash Flows From Investing Activities Additions to property, plant, equipment and mine development (26.4 ) (10.3 ) (36.7 ) Changes in accrued expenses related to capital expenditures 0.4 (1.9 ) (1.5 ) Federal coal lease expenditures (248.5 ) — (248.5 ) Proceeds from disposal of assets, net of notes receivable 66.3 66.2 132.5 Contributions to joint ventures — (140.5 ) (140.5 ) Distributions from joint ventures — 139.7 139.7 Advances to related parties — (22.7 ) (22.7 ) Repayments of loans from related parties — 11.9 11.9 Other, net (1.4 ) (1.5 ) (2.9 ) Net cash (used in) provided by investing activities (209.6 ) 40.9 (168.7 ) Cash Flows From Financing Activities Proceeds from long-term debt 475.0 7.8 482.8 Repayments of long-term debt (1.8 ) (2.3 ) (4.1 ) Payment of deferred financing costs (25.6 ) (1.4 ) (27.0 ) Distributions to noncontrolling interests — (3.9 ) (3.9 ) Other, net (0.1 ) — (0.1 ) Transactions with affiliates, net (14.9 ) 14.9 — Net cash provided by financing activities 432.6 15.1 447.7 Net change in cash and cash equivalents 593.6 (77.9 ) 515.7 Cash and cash equivalents at beginning of period 108.5 543.6 652.1 Cash and cash equivalents at end of period $ 702.1 $ 465.7 $ 1,167.8

Basis of Presentation Basis of

Basis of Presentation Basis of Presentation text (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2015	Oct. 07, 2016	Sep. 30, 2016	Apr. 13, 2016	Dec. 31, 2015
Stockholders' Equity, Reverse Stock Split	Pursuant to the authorization provided at a special meeting of the Company's stockholders held on September 16, 2015, the Company completed a 1-for-15 reverse stock split of the shares of the Company’s common stock on September 30, 2015 (the Reverse Stock Split). As a result of the Reverse Stock Split, every 15 shares of issued and outstanding common stock were combined into one issued and outstanding share of Common Stock, without any change in the par value per share.
Senior Notes		$ 287
DIP Credit Agreement [Member]
Long-term debt				$ 800
Senior Notes [Member]
Debt Instrument, Face Amount			$ 1,650
Intercompany Loan Facility [Member]
Lien Value Threshold of Assets Collateralizing the Intercompany Loan Facility			50.00%
Intercompany Loans			$ 250
Common Stock [Member]
Stock Issued, Shares, Reverse Stock Splits	278
Common Stock, shares issued	19		19.3		19.3
Stock Authorized, Shares, Reverse Stock Splits	800
Common Stock, shares authorized	53.3		53.3		53.3
Common Stock, par value per share	$ 0.01		$ 0.01		$ 0.01

Newly Adopted Accounting Stan53

Newly Adopted Accounting Standards and Accounting Standards Not Yet Implemented Accounting Standards Not Yet Implemented (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Deferred Financing Costs [Line Items]
Other current assets	$ 368.9	$ 447.6
Investments and other assets	771.6	363.7
Total assets	12,235.2	10,946.9
Current portion of long-term debt	493.1	5,874.9
Long-term debt, less current portion	0	366.3
Total liabilities	$ 11,711.3	10,028.4
Adoption of New Accounting Pronouncement [Member]
Deferred Financing Costs [Line Items]
Other current assets		(55.5)
Investments and other assets		(18.9)
Total assets		(74.4)
Current portion of long-term debt		(55.5)
Long-term debt, less current portion		(18.9)
Total liabilities		(74.4)
Before Adoption [Member]
Deferred Financing Costs [Line Items]
Other current assets		503.1
Investments and other assets		382.6
Total assets		11,021.3
Current portion of long-term debt		5,930.4
Long-term debt, less current portion		385.2
Total liabilities		$ 10,102.8

Reorganization Items, Net (Deta

Reorganization Items, Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2015
Payments for reorganization items, net				$ 30.7
Reorganization Items, net	$ 29.7	$ 0	$ (125.1)	125.1	$ 0
Loss on termination of derivative contracts [Member]
Reorganization Items, net	0			75.2
Professional fee [Member]
Reorganization Items, net	31.1			52.7
accounts payable settlement (gains) losses [Member]
Reorganization Items, net	(0.5)			(0.7)
Interest Income [Member]
Reorganization Items, net	(0.9)			(1.1)
Other reorganization items [Member]
Reorganization Items, net	$ 0			$ (1)

Liabilities Subject to Compro55

Liabilities Subject to Compromise (Details) - USD ($)		Sep. 30, 2016	Dec. 31, 2015
Schedule of liabilities subject to compromise [Line Items]
Liabilities subject to compromise		$ 8,331,600,000	$ 0
Long-term Debt [Member]
Schedule of liabilities subject to compromise [Line Items]
Liabilities subject to compromise	[1]	7,920,400,000
Interest Payable [Member]
Schedule of liabilities subject to compromise [Line Items]
Liabilities subject to compromise		172,600,000
Accounts Payable [Member]
Schedule of liabilities subject to compromise [Line Items]
Liabilities subject to compromise		77,300,000
Environmental liabilities
Schedule of liabilities subject to compromise [Line Items]
Liabilities subject to compromise		62,900,000
Other Pension Plan, Postretirement or Supplemental Plans [Member]
Schedule of liabilities subject to compromise [Line Items]
Liabilities subject to compromise	[2]	34,000,000
UMWA Plan liability
Schedule of liabilities subject to compromise [Line Items]
Liabilities subject to compromise	[3]	25,000,000
Property Taxes [Member]
Schedule of liabilities subject to compromise [Line Items]
Liabilities subject to compromise		7,100,000
Accrued Liabilities [Member]
Schedule of liabilities subject to compromise [Line Items]
Liabilities subject to compromise		32,300,000
Debt [Member] | Long-term Debt [Member]
Schedule of liabilities subject to compromise [Line Items]
Liabilities subject to compromise	[1]	7,601,600,000
Hedge terminations [Member] | Long-term Debt [Member]
Schedule of liabilities subject to compromise [Line Items]
Liabilities subject to compromise	[1]	257,300,000
Liabilities secured by prepetition letters of credit [Member] | Long-term Debt [Member]
Schedule of liabilities subject to compromise [Line Items]
Liabilities subject to compromise	[1]	$ 61,500,000
[1]	Includes $7,601.6 million of debt, $257.3 million of derivative contract terminations, and $61.5 million of liabilities secured by prepetition letters of credit.
[2]	Includes liabilities for unfunded non-qualified pension plans, all the participants of which are former employees.
[3]	Refer to Note 20. "Matters Related to the Bankruptcy of Patriot Coal Corporation" for additional information.

Asset Impairment (Details)

Asset Impairment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2016
Asset Impairment
Asset impairment of long-lived assets				$ 717.4
Asset realization risk	$ 577.7		$ 577.7
Equity Method Investment, Other than Temporary Impairment				183.4
Total asset impairment	0	$ 0	17.2	900.8
Asset impairment	$ 0	0	17.2	900.8
Australian Metallurgical Mining [Member]
Asset Impairment
Asset impairment of long-lived assets				527
Impairment of Long-Lived Assets Held-for-use		230.5
Equity Method Investment, Other than Temporary Impairment				0
Total asset impairment				527
Asset impairment			$ 17.2
Australianheldforsale [Member]
Asset Impairment
Impairment of Long-Lived Assets to be Disposed of		304.7
Australian Thermal Mining [Member]
Asset Impairment
Asset impairment of long-lived assets				8.2
Equity Method Investment, Other than Temporary Impairment				0
Total asset impairment				8.2
Corporate and Other [Member]
Asset Impairment
Asset impairment of long-lived assets				182.2
Impairment of Long-Lived Assets to be Disposed of		182.2
Equity Method Investment, Other than Temporary Impairment				183.4
Total asset impairment				$ 365.6
Investments [Member]
Asset Impairment
Equity Method Investment, Other than Temporary Impairment		46.6
Loans [Member]
Asset Impairment
Equity Method Investment, Other than Temporary Impairment		$ 136.8
Scenario, Forecast [Member] | Metropolitan mine [Member]
Asset Impairment
Asset impairment					$ 180

Discontinued Operations (Detail

Discontinued Operations (Details) AUD in Millions, $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)	Dec. 31, 2015USD ($)	Sep. 30, 2016AUD
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss from discontinued operations, net of income taxes	$ (38.1)	$ (157.5)	$ (40.5)	$ (44.5)	$ (202.7)
Other current assets	3.9		3.9	3.9		$ 3.1
Investments and other assets	13.2		13.2	13.2		13.2
Total assets classified as discontinued operations	17.1		17.1	17.1		16.3
Accounts payable and accrued expenses	30.2		30.2	30.2		60
Other noncurrent liabilities	197		197	197		203.7
Liabilities subject to compromise	8,331.6		8,331.6	8,331.6		0
Total liabilities classified as discontinued operations	273.1		273.1	273.1		263.7
Wilkie Creek [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Charge to discontinued operations					$ 7.6	9.7
Settlement charges total	9.9		9.9	9.9			AUD 13
Accounts Payable [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Liabilities subject to compromise	45.9		45.9	45.9		$ 0
United Mine Workers of America [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss from discontinued operations, net of income taxes	35
Accounts payable and accrued expenses	10		10	10
Liabilities subject to compromise	$ 25		$ 25	$ 25

Inventories (Details)

Inventories (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Inventories [Line Items]
Materials and supplies	$ 110.7	$ 115.9
Raw coal	53	75.9
Saleable coal	95.9	116
Total	$ 259.6	$ 307.8

Inventories Details Textuals (D

Inventories Details Textuals (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Reserve for materials and supplies [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Materials and supplies reserves	$ 6	$ 4.7

Derivatives and Fair Value Me60

Derivatives and Fair Value Measurements (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2017
Company's foreign currency and commodity positions by Year of Maturity and Account Classification
Derivative Assets (Liabilities), at Fair Value, Net	$ 0
Timing differences between the hedge settlement and the purchase transaction	Less than a day and up to a maximum of 30 days
Scenario, Forecast [Member] | Foreign currency forward contract [Member]
Company's foreign currency and commodity positions by Year of Maturity and Account Classification
Net loss to be reclassified from accumulated other comprehensive loss to earnings over the next 12 months		$ 68,000,000
Scenario, Forecast [Member] | Diesel fuel hedge contracts [Member]
Company's foreign currency and commodity positions by Year of Maturity and Account Classification
Net loss to be reclassified from accumulated other comprehensive loss to earnings over the next 12 months		$ 50,000,000

Derivatives and Fair Value Me61

Derivatives and Fair Value Measurements (Details 1) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015		Sep. 30, 2016		Sep. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net		$ 0.1				$ 14.9
Operating costs and expenses [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Loss recognized in income on non-designated derivatives	$ (47.4)			$ (273)
Operating costs and expenses [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
(Loss) reclassified from other comprehensive income into income (ineffective portion)		(0.5)				1.3
Derivative Instruments, (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net		(181.3)				(164.5)
Derivative Instruments, (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		(116.4)	[1]			(327.9)	[2]
Operating costs and expenses [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Loss reclassified from Accumulated OCI into income	(47.4)			(188.5)	[3]
(Loss) gain recognized in income on derivatives	0			(84.4)
Unrealized gain (loss) on derivatives and commodity contracts	0			0
Commodity swap contracts [Member] | Operating costs and expenses [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Loss recognized in income on non-designated derivatives	(19.4)			(78.4)
Commodity swap contracts [Member] | Operating costs and expenses [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
(Loss) reclassified from other comprehensive income into income (ineffective portion)		(0.5)				1.3
Derivative Instruments, (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net		(63.1)				(27.3)
Derivative Instruments, (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		(31.9)	[1]			(89)	[2]
Commodity swap contracts [Member] | Operating costs and expenses [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
(Losses) reclassified into earnings, net				9
Loss reclassified from Accumulated OCI into income	(19.4)			(66.4)	[3]
(Loss) gain recognized in income on derivatives	0			(11.9)
Unrealized gain (loss) on derivatives and commodity contracts	0			0
Commodity swap contracts [Member] | Reorganization items [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Loss recognized in income on non-designated derivatives				(38.8)
Commodity swap contracts [Member] | Reorganization items [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Loss reclassified from Accumulated OCI into income				0
(Loss) gain recognized in income on derivatives				(38.8)
Unrealized gain (loss) on derivatives and commodity contracts				0
Foreign currency forward contract [Member] | Operating costs and expenses [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
(Losses) reclassified into earnings, net				13.6
Loss recognized in income on non-designated derivatives	(28)			(119.4)
Foreign currency forward contract [Member] | Operating costs and expenses [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
(Loss) reclassified from other comprehensive income into income (ineffective portion)		0				0
Derivative Instruments, (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net		(118.2)				(137.2)
Derivative Instruments, (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		$ (84.5)	[1]			$ (238.9)	[2]
Foreign currency forward contract [Member] | Operating costs and expenses [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Loss reclassified from Accumulated OCI into income	(28)			(122.1)	[3]
(Loss) gain recognized in income on derivatives	0			2.7
Unrealized gain (loss) on derivatives and commodity contracts	$ 0			0
Foreign currency forward contract [Member] | Reorganization items [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Loss recognized in income on non-designated derivatives				(36.4)
Foreign currency forward contract [Member] | Reorganization items [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Loss reclassified from Accumulated OCI into income				0
(Loss) gain recognized in income on derivatives				(36.4)
Unrealized gain (loss) on derivatives and commodity contracts				$ 0
[1]	Includes the reclassification from "Accumulated other comprehensive loss" into earnings of $0.1 million of previously unrecognized gains on foreign currency cash flow hedge contracts monetized in the fourth quarter of 2012.
[2]	Includes the reclassification from "Accumulated other comprehensive loss" into earnings of $14.9 million of previously unrecognized gains on foreign currency cash flow hedge contracts monetized in the fourth quarter of 2012.
[3]	Includes the reclassification from "Accumulated other comprehensive 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 Me62

Derivatives and Fair Value Measurements (Details 2) - USD ($)		Sep. 30, 2016	Dec. 31, 2015
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net		$ 0
Net amounts presented in the condensed consolidated balance sheet [Member]
Derivative [Line Items]
Derivative liabilities, current	[1]		$ 231,700,000
Derivative liabilities, noncurrent	[1]		92,700,000
Net amounts presented in the condensed consolidated balance sheet [Member] | Commodity swap contracts [Member]
Derivative [Line Items]
Derivative liabilities, current	[1]		86,100,000
Derivative liabilities, noncurrent	[1]		37,600,000
Net amounts presented in the condensed consolidated balance sheet [Member] | Foreign currency forward contract [Member]
Derivative [Line Items]
Derivative liabilities, current	[1]		145,600,000
Derivative liabilities, noncurrent	[1]		55,100,000
Fair Value, Measurements, Recurring [Member] | Commodity swap contracts [Member]
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net			(123,700,000)
Fair Value, Measurements, Recurring [Member] | Foreign currency forward contract [Member]
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net			$ (200,700,000)
[1]	All commodity swap contracts and foreign currency forward contracts were in a liability position as of December 31, 2015.

Derivatives and Fair Value Me63

Derivatives and Fair Value Measurements (Details 3) - USD ($)		9 Months Ended
		Sep. 30, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net		$ 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements		(292,100,000)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	[1]	(32,300,000)
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value		0	$ 324,400,000
Level 1 to Level 2 transfers		0	0
Level 2 to Level 1 transfers		0	0
Commodity swap contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements		(139,400,000)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	[1]	15,700,000
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value		0	123,700,000
Foreign currency forward contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements		(152,700,000)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	[1]	(48,000,000)
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value		$ 0	200,700,000
Fair Value, Measurements, Recurring [Member]
Fair value of financial asset (liability) positions measured on a recurring basis
Assets And Liabilities Fair Value Disclosure			(324,400,000)
Fair Value, Measurements, Recurring [Member] | Commodity swap contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net			(123,700,000)
Fair Value, Measurements, Recurring [Member] | Foreign currency forward contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net			(200,700,000)
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Fair value of financial asset (liability) positions measured on a recurring basis
Assets And Liabilities Fair Value Disclosure			0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Commodity swap contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net			0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Foreign currency forward contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net			0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Fair value of financial asset (liability) positions measured on a recurring basis
Assets And Liabilities Fair Value Disclosure			0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Commodity swap contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net			0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Foreign currency forward contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net			0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Fair value of financial asset (liability) positions measured on a recurring basis
Assets And Liabilities Fair Value Disclosure			(324,400,000)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Commodity swap contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net			(123,700,000)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Foreign currency forward contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net			$ (200,700,000)
[1]	Includes reorganization items and realized gains (losses)

Derivatives and Fair Value Me64

Derivatives and Fair Value Measurements (Details 4) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Carrying value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Current and long-term debt, carrying value	$ 8,094.7	$ 6,241.2
Estimated fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Current and long-term debt, fair value		$ 1,372.7

Coal Trading (Details)

Coal Trading (Details) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Coal trading derivative instruments and balance sheet offsetting disclosures:
Net assets (liabilities) from coal trading activities		$ 0		$ 0
Coal Trading [Member]
Trading Revenues by Type of Instrument [Line Items]
Total trading (losses) revenues		(19,200,000)	$ 24,500,000	(32,600,000)	$ 42,700,000
Coal trading derivative instruments and balance sheet offsetting disclosures:
Assets from coal trading activities, gross amounts of recognized assets		169,900,000		169,900,000		$ 128,600,000
Liabilities from coal trading activities, gross amounts of recognized liabilities		(227,400,000)		(227,400,000)		(110,000,000)
Assets and (liabilities) from coal trading activities, net amounts recognized before the application of variation margin		(57,500,000)		(57,500,000)		18,600,000
Gross amounts of coal trading liabilities offset against associated coal trading assets		(149,100,000)		(149,100,000)		(87,300,000)
Gross amounts of coal trading assets offset against associated coal trading liabilities		149,100,000		149,100,000		87,300,000
Net coal trading (liabilities) assets offset against associated assets (liabilities)		0		0		0
Variation margin held offset against assets from coal trading activities	[1]	(900,000)		(900,000)		(17,800,000)
Variation margin posted offset against liabilities from coal trading activities	[1]	58,800,000		58,800,000		7,100,000
Net variation margin (held) posted	[1]	57,900,000		57,900,000		(10,700,000)
Assets from coal trading activities, net		19,900,000		19,900,000		23,500,000
Liabilities from coal trading activities, net		(19,500,000)		(19,500,000)		(15,600,000)
Net assets (liabilities) from coal trading activities		400,000		400,000		7,900,000
Commodity futures, swaps and options [Member] | Coal Trading [Member]
Trading Revenues by Type of Instrument [Line Items]
Total trading (losses) revenues		(32,400,000)	47,700,000	(68,700,000)	89,400,000
Physical commodity purchase / sale contracts [Member] | Coal Trading [Member]
Trading Revenues by Type of Instrument [Line Items]
Total trading (losses) revenues		13,200,000	$ (23,200,000)	36,100,000	$ (46,700,000)
Cash Flow Hedging [Member] | Coal Trading [Member]
Coal trading derivative instruments and balance sheet offsetting disclosures:
Net variation margin (held) posted		$ 0		$ 0		$ 0
[1]	None of the net variation margin held at September 30, 2016 and December 31, 2015, respectively, related to cash flow hedges.

Coal Trading (Details 1)

Coal Trading (Details 1) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value		$ 0		$ 0			$ (324.4)
Coal Trading (Textuals) [Abstract]
Fair value hierarchy transfers from Level 1 to Level 2		0		0			0
Fair value hierarchy transfers from Level 2 to Level 1		0		0			0
Schedule of future realization of trading portfolio
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	[1]			32.3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements				292.1
Coal Trading [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value		(0.7)		(0.7)		$ (1.1)	(15.6)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value								$ 1.3	$ 1.8	$ 2.1
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3		(11.1)	$ 0	(0.4)	$ 0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	[2]	0.1	0.1	(0.1)	0.4
Coal Trading (Textuals) [Abstract]
Fair value hierarchy transfers from Level 1 to Level 2		0		0					0
Fair value hierarchy transfers from Level 2 to Level 1		0		0					$ 0
Schedule of future realization of trading portfolio
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3		4.6	0	5	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings		2.6		1.2
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			0		0.5
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales		0.1	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements		4.2		9.1
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements)			$ (0.5)		$ (1.3)
Fair Value, Measurements, Recurring [Member] | Coal Trading [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Futures, Swaps And Options Fair Value Disclosure		(0.3)		(0.3)			3.3
Physical Purchase Sale Contracts Fair Value Disclosure		0.7		0.7			4.6
Fair value coal trading net assets (liabilities) measured on recurring basis:
Total net financial (liabilities) assets		0.4		0.4			7.9
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Coal Trading [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Futures, Swaps And Options Fair Value Disclosure		0		0			0
Physical Purchase Sale Contracts Fair Value Disclosure		0		0			0
Fair value coal trading net assets (liabilities) measured on recurring basis:
Total net financial (liabilities) assets		0		0			0
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Coal Trading [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Futures, Swaps And Options Fair Value Disclosure		(0.1)		(0.1)			3.3
Physical Purchase Sale Contracts Fair Value Disclosure		1.2		1.2			20.2
Fair value coal trading net assets (liabilities) measured on recurring basis:
Total net financial (liabilities) assets		1.1		1.1			23.5
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Coal Trading [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Futures, Swaps And Options Fair Value Disclosure		(0.2)		(0.2)			0
Physical Purchase Sale Contracts Fair Value Disclosure		(0.5)		(0.5)			(15.6)
Fair value coal trading net assets (liabilities) measured on recurring basis:
Total net financial (liabilities) assets		$ (0.7)		$ (0.7)			$ (15.6)
[1]	Includes reorganization items and realized gains (losses)
[2]	(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 (Details 2)

Coal Trading (Details 2) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2016	Dec. 31, 2015
Concentration Risk [Line Items]
Number of major credit rating agencies that adjusted corporate credit rating		3
Coal Trading [Member]
Concentration Risk [Line Items]
Percentage Of Trading Portfolio Expiration Year One		66.00%
Percentage Of Trading Portfolio Expiration Year Two		(171.00%)
Percentage Of Trading Portfolio Expiration Year Three		5.00%
Percentage Of Trading Portfolio Expiration		(100.00%)
Potential collateralization that may be requested by counterparties related to material adverse event		$ 1	$ 21
Margin posted to counterparties related to material adverse event		4	0
Additional potential collateral requirements for a credit downgrade		0	0
Margin posted to counterparties related to credit rating		0	0
Total asset (liabilities) from coal trading activities, net	[1]	57.9	(10.7)
Initial margin posted		11.3	9.2
Margin in excess of the exchange-required variation and initial margin		$ (1.3)	(0.7)
External Credit Rating, Investment Grade [Member] | Credit Concentration Risk [Member] | Coal Trading Positions [Member] | Coal Trading [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage		65.00%
External Credit Rating, Non Investment Grade [Member] | Credit Concentration Risk [Member] | Coal Trading Positions [Member] | Coal Trading [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage		11.00%
Non Rated [Member] | Credit Concentration Risk [Member] | Coal Trading Positions [Member] | Coal Trading [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage		24.00%
Cash Flow Hedging [Member] | Coal Trading [Member]
Concentration Risk [Line Items]
Total asset (liabilities) from coal trading activities, net		$ 0	$ 0
Risk Level, High [Member] | Coal Trading [Member]
Concentration Risk [Line Items]
Quality Adjustment Level 3 Unobservable Input as Percentage of Overall Valuation		2.00%
Location Differentials Level 3 Unobservable Input As Percentage of Overall Valuation		9.00%
Credit and non-performance risk, level 3 unobservable input as a percentage of overall valuation		26.00%
Weighted Average [Member] | Coal Trading [Member]
Concentration Risk [Line Items]
Quality Adjustment Level 3 Unobservable Input as Percentage of Overall Valuation		2.00%
Location Differentials Level 3 Unobservable Input As Percentage of Overall Valuation		9.00%
Credit and non-performance risk, level 3 unobservable input as a percentage of overall valuation		26.00%
Minimum [Member] | Coal Trading [Member]
Concentration Risk [Line Items]
Quality Adjustment Level 3 Unobservable Input as Percentage of Overall Valuation		2.00%
Location Differentials Level 3 Unobservable Input As Percentage of Overall Valuation		9.00%
Credit and non-performance risk, level 3 unobservable input as a percentage of overall valuation		26.00%
[1]	None of the net variation margin held at September 30, 2016 and December 31, 2015, respectively, related to cash flow hedges.

Financing Receivables (Details)

Financing Receivables (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2011	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, net	$ 351.9		$ 228.8
Other current assets	$ 368.9		447.6
Codrilla Mine Project [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of ownership before selldown		85.00%
Percentage of undivided interests acquired		73.30%
Percentage of agreed sale price as final installment payment due	40.00%
Middlemount Mine [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Equity method investment, ownership percentage	50.00%
Basis spread over Australian Bank Bill Swap Reference Rate	3.50%
Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, net	$ 0		0
Other current assets	0		20
Investments and other assets	68.6		65.2
Total financing receivables	68.6		85.2
Financing Receivable [Member] | Codrilla Mine Project [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other current assets			20
Financing Receivable [Member] | Middlemount Mine [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Investments and other assets	$ 58.3		$ 65.2

Property, Plant, Equipment an69

Property, Plant, Equipment and Mine Development (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Property, Plant, Equipment and Mine Development, Net [Line Items]
Land and coal interests	$ 10,756.7	$ 10,503.7
Buildings and improvements	1,533	1,506
Machinery and equipment	2,272.5	2,280.4
Less: Accumulated depreciation, depletion and amortization	(5,346.7)	(5,031.6)
Total, net	$ 9,215.5	$ 9,258.5

Income Taxes Details Textuals (

Income Taxes Details Textuals (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2015
Income Taxes
Income tax (benefit) provision	$ (12.9)	$ 6.9	$ (30.9)	$ (108.7)	$ (83.2)
Remeasurement provision (benefit) related to foreign income tax accounts	$ 0.3	$ (0.8)			$ (1)

Long-term Debt (Details)

Long-term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Capital lease obligations	$ 22.1		$ 30.3
Other	0.5		0.7
Liabilities subject to compromise	8,331.6		0
Current portion of long-term debt	493.1		5,874.9
Long-term debt, less current portion	0		366.3
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt	1,388.4	$ 947	0
2013 Term Loan Facility due September 2020 [Member]
Debt Instrument [Line Items]
Long-term debt	1,154.5		1,156.3
6.00% Senior Notes due November 2018 [Member]
Debt Instrument [Line Items]
Long-term debt	1,509.9		1,508.9
6.50% Senior Notes due September 2020 [Member]
Debt Instrument [Line Items]
Long-term debt	645.8		645.5
6.25% Senior Notes due November 2021 [Member]
Debt Instrument [Line Items]
Long-term debt	1,327.7		1,327
10.00% Senior Secured Second Lien Notes Due March 2022 [Member]
Debt Instrument [Line Items]
Long-term debt	962.3		960.4
7.875% Senior Notes due November 2026 [Member]
Debt Instrument [Line Items]
Long-term debt	245.9		245.8
Convertible Junior Subordinated Debentures due December 2066 [Member]
Debt Instrument [Line Items]
Long-term debt	367.1		366.3
DIP Term Loan Facility [Member]
Debt Instrument [Line Items]
Long-term debt	470.5		0
Long-term Debt [Member]
Debt Instrument [Line Items]
Liabilities subject to compromise	7,601.6		0
Carrying value
Debt Instrument [Line Items]
Total debt	$ 8,094.7		$ 6,241.2

Long-term Debt Textuals (Detail

Long-term Debt Textuals (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	May 18, 2016	Apr. 18, 2016	Apr. 15, 2016	Apr. 13, 2016	Mar. 31, 2016	Dec. 31, 2015	Apr. 15, 2015
Debt Instrument [Line Items]
Posted but undrawn letters of credit	$ 144.9		$ 144.9	$ 144.9
Contractual interest expense	151.4			$ 417.1
30-day grace period				30-day grace period
Interest expense	58.5	$ 118.5	95.5	$ 243.7	$ 344
Interest Expense, Adequate Protection Payments	39.6			64.2
Interest Expense, Stayed Amount	92.9			173.4
Loss on early debt extinguishment	0	0		0	(67.8)
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt	1,388.4		1,388.4	1,388.4						$ 947	$ 0
Credit agreement borrowing capacity	1,650		1,650	1,650
Posted but undrawn letters of credit	675		675	675					$ 675
Letters of Credit, Additional	441.4		441.4	441.4
Collateral in support of letters of credit	343.7		343.7	343.7
2013 Term Loan Facility due September 2020 [Member]
Debt Instrument [Line Items]
Long-term debt	1,154.5		1,154.5	1,154.5							1,156.3
Debt Instrument, Outstanding Principal	1,170		1,170	1,170
6.00% Senior Notes due November 2018 [Member]
Debt Instrument [Line Items]
Long-term debt	1,509.9		1,509.9	1,509.9							1,508.9
Debt Instrument, Outstanding Principal	$ 1,518.8		$ 1,518.8	$ 1,518.8
Stated interest rate - percentage	6.00%		6.00%	6.00%
6.50% Senior Notes due September 2020 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 645.8		$ 645.8	$ 645.8							645.5
Debt Instrument, Outstanding Principal	$ 650		$ 650	$ 650
Stated interest rate - percentage	6.50%		6.50%	6.50%
Interest expense				$ 21.1
6.25% Senior Notes due November 2021 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 1,327.7		$ 1,327.7	1,327.7							1,327
Debt Instrument, Outstanding Principal	$ 1,339.6		$ 1,339.6	$ 1,339.6
Stated interest rate - percentage	6.25%		6.25%	6.25%
10.00% Senior Secured Second Lien Notes Due March 2022 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 962.3		$ 962.3	$ 962.3							960.4
Debt Instrument, Outstanding Principal	$ 1,000		$ 1,000	$ 1,000
Stated interest rate - percentage	10.00%		10.00%	10.00%
Interest expense				$ 50
Debt Instrument, Face Amount		1,000			1,000
7.875% Senior Notes due November 2026 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 245.9		$ 245.9	245.9							245.8
Debt Instrument, Outstanding Principal	$ 250		$ 250	$ 250
Stated interest rate - percentage	7.875%		7.875%	7.875%
Convertible Junior Subordinated Debentures due December 2066 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 367.1		$ 367.1	$ 367.1							366.3
Debt Instrument, Outstanding Principal	$ 732.5		$ 732.5	$ 732.5
7.375% Senior Notes due November 2016 [Member]
Debt Instrument [Line Items]
Stated interest rate - percentage	7.375%		7.375%	7.375%
Debt Instrument, Repurchased Face Amount		650			650
Debt Instrument, Repurchase Amount		$ 566.9			566.9
Debt Instrument Redemption 2016 Notes												$ 83.1
Loss on early debt extinguishment					(67.8)
Tender Offer Premiums Paid on 2016 Senior Notes Repurchase					66.4
Write off of Deferred Debt Issuance Cost					$ 1.4
DIP Facility - Term Loan [Member]
Debt Instrument [Line Items]
Long-term debt									500
DIP Facility - Initially Available [Member]
Debt Instrument [Line Items]
Long-term debt							$ 200	$ 200	200
DIP Facility - Remaining Availability [Member]
Debt Instrument [Line Items]
Long-term debt						$ 300			300
DIP Term Loan Facility [Member]
Debt Instrument [Line Items]
Long-term debt	$ 470.5		$ 470.5	$ 470.5							$ 0
Applicable Interest Rate, Eurocurrency Rate Loans	9.00%		9.00%	9.00%
Debt Instrument, Libor Interest Rate	1.00%		1.00%	1.00%
Applicable Rate, Base Rate Loan	8.00%		8.00%	8.00%
Extension Fee	2.50%		2.50%	2.50%
Debt Issuance Cost	$ 25.6
Intercompany Loan Facility [Member]
Debt Instrument [Line Items]
Intercompany Loans	250		$ 250	$ 250
Intercompany Loan, Potential Increase	$ 200		$ 200	$ 200
Lien Value Threshold of Assets Collateralizing the Intercompany Loan Facility	50.00%		50.00%	50.00%
Intercompany Loans, Outstanding	$ 30		$ 30	$ 30
DIP Facility - Letter of Credit [Member]
Debt Instrument [Line Items]
Posted but undrawn letters of credit								100	100
DIP Facility - Bonding Accommodation Facility [Member]
Debt Instrument [Line Items]
Long-term debt								$ 200	200
DIP Credit Agreement [Member]
Debt Instrument [Line Items]
Long-term debt									800
Aggregate Letters of Credit, Maximum									$ 50

Pension and Postretirement Be73

Pension and Postretirement Benefit Costs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2016
Components of net periodic benefit cost
Income tax (benefit) provision	$ (12.9)	$ 6.9	$ (30.9)	$ (108.7)	$ (83.2)
Pension Plans, Defined Benefit [Member]
Components of net periodic benefit cost
Service cost for benefits earned	0.7	0.7		2	2
Interest cost on projected or accumulated postretirement benefit obligation	10.3	10.1		31	30.3
Expected return on plan assets	(11.3)	(12)		(33.9)	(36.1)
Amortization of prior service cost and net actuarial loss	6.3	10		18.8	30.4
Net periodic pension or postretirement benefit cost	$ 6	8.8		$ 17.9	26.6
Funding threshhold	80.00%		80.00%	80.00%
Employer contributions to pension plan				$ 0.6
Other Pension Plan, Postretirement or Supplemental Plans [Member]
Components of net periodic benefit cost
Employer contributions to pension plan	$ 0.4			0.5
Other Postretirement Benefit Plan [Member]
Components of net periodic benefit cost
Service cost for benefits earned	2.6	2.8		7.8	8.4
Interest cost on projected or accumulated postretirement benefit obligation	8.5	8.4		25.6	25.3
Amortization of prior service cost and net actuarial loss	2.4	4.6		7.1	13.6
Net periodic pension or postretirement benefit cost	$ 13.5	$ 15.8		$ 40.5	$ 47.3
Scenario, Forecast [Member] | Pension Plans, Defined Benefit [Member]
Components of net periodic benefit cost
Estimated contribution in 2016 to pension plan						$ 0.5

Accumulated Other Comprehensi74

Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Accumulated other comprehensive income [Line Items]
Foreign Currency Translation Adjustment		$ (144)		$ (144)		$ (146.4)
Foreign Currency Translation Adjustment, Reclassification from other comprehensive income to earnings				0
Foreign Currency Translation Adjustment, Current period change		1.5	$ (15.3)	2.4	$ (41.5)
Net Actuarial Loss Associated With Postretirement Plans And Workers' Compensation Obligation		(248)		(248)		(263.8)
Net actuarial loss associated with postretirement plans and workers' compensation obligations, Reclassification from other comprehensive income to earnings	[1]	5.3	12.5	15.8	30.3
Net actuarial loss associated with postretirement plans and workers' compensation obligations, Current period change				0
Prior Service Cost Associated with Postretirement Plans		26.8		26.8		31.8
Prior service cost associated with postretirement plans, Reclassification from other comprehensive income to earnings	[1]	(1.7)	(1.7)	(5)	(3.5)
Prior service cost associated with postretirement plans, Current period change				0
Cash Flow Hedges		(121.5)		(121.5)		(240.5)
Cash flow hedges, Net change in fair value		0	(115.6)	0	(100.4)
Cash flow hedges, Reclassification from other comprehensive income to earnings	[1]	29.9	68.9	119	183.9
Cash flow hedges, Current period change				0
Total Accumulated Other Comprehensive Loss		(486.7)		(486.7)		$ (618.9)
Total Accumulated Other Comprehensive Loss, Reclassification from other comprehensive income to earnings				129.8
Total Accumulated Other Comprehensive Loss, Current period change				2.4
PostretirementHealthCareAndLifeInsuranceBenefitsOperatingCostsAndExpensesActuarialLoss [Member]
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax	[1]	(5.2)	(6.3)	(15.4)	(18.7)
DefinedBenefitPensionPlansOperatingCostsAndExpensesActuarialLoss [Member]
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax	[1]	(5.1)	(8.2)	(15.3)	(24.7)
DefinedBenefitPensionPlansSellingAndAdministrativeExpensesActuarialLoss [Member]
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax	[1]	(1.1)	(1.6)	(3.2)	(5)
InsignificantItemsActuarialLoss [Member]
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax	[1]	3	2	8.8	6
NetActuarialLossAssociatedWithPostretirementPlansAndWorkersCompensationObligationsTotalBeforeIncomeTaxes [Member]
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax	[1]	(8.4)	(14.1)	(25.1)	(42.4)
IncomeTaxProvisionActuarialLoss [Member]
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), Tax	[1]	3.1	1.6	9.3	12.1
PostretirementHealthCareAndLifeInsuranceBenefitsOperatingCostsAndExpensesPriorServiceCost [Member]
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax	[1]	2.8	1.7	8.3	5.1
Definedbenefitpensionplanspriorservicecost [Member]
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax	[1]	(0.1)	(0.2)	(0.3)	(0.7)
PriorServiceCostAssociatedWithPostretirementPlansAndWorkersCompensationObligationsTotalBeforeIncomeTaxes [Member]
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax	[1]	2.7	1.5	8	4.4
Incometaxprovisionpriorservicecost [Member]
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), Tax	[1]	(1)	0.2	(3)	(0.9)
ForeignCurrencyCashFlowHedgeContractsOperatingCostsAndExpenses [Member]
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	[1]	(28)	(84.5)	(122.1)	(238.9)
CommoditySwapsOperatingCostsAndExpenses [Member]
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	[1]	(19.4)	(32.4)	(66.4)	(87.7)
CoalTradingOtherRevenues [Member]
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	[1]	0	13.2	0	35.6
InsignificantItemsCashFlowHedges [Member]
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	[1]	(0.1)	(0.2)	(0.4)	(0.5)
TotalBeforeIncomeTaxesCashFlowHedges [Member]
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	[1]	(47.5)	(103.9)	(188.9)	(291.5)
IncomeTaxProvisionCashFlowHedges [Member]
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	[1]	$ 17.6	$ 35	$ 69.9	$ 107.6
[1]	Presented as gains (losses) in the unaudited condensed consolidated statements of operations.

Other Events (Details)

Other Events (Details) AUD in Millions, $ in Millions	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2016USD ($)	Dec. 31, 2015USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2016AUD
Other Commercial Events [Line Items]
Restructuring charges	$ 0.3		$ 1.8	$ 2.8	$ 15.5	$ 23
Proceeds from disposal of assets, net of notes receivable				132.5	134.7	39.6
Restricted cash and investments, noncurrent	70.6			70.6	70.6
Restricted Cash and Cash Equivalents, Noncurrent	1.4			1.4	1.4
Restricted cash and cash equivalents	22.8			22.8	22.8
Reduction in estimated take-or-pay obligations	45			45	45
Take-or-pay obligation settlement					15.5	$ 0
Cash Collateral | AUD							AUD 50
Non-debtor lease committments	215			$ 215	215
Nonstrategic Illinois mining tenement [Member] [Member]
Other Commercial Events [Line Items]
Proceeds from disposal of assets, net of notes receivable	57.1
Gain recognized on sale	6.2				6.2
Nonstrategic Australian mining tenement [Member]
Other Commercial Events [Line Items]
Proceeds from disposal of assets, net of notes receivable					64.1
Gain recognized on sale	$ 2.8				$ 2.8
New Mexico/Colorado mining tenement [Member] [Member]
Other Commercial Events [Line Items]
Proceeds from disposal of assets, net of notes receivable		$ 358
Termination fee		$ 20
Prarie State Energy Campus [Member]
Other Commercial Events [Line Items]
Undivided Interest Percent Of New Electricity Generation Project	5.06%			5.06%	5.06%		5.06%

Earnings per Share (EPS) (Detai

Earnings per Share (EPS) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Earnings per Share (EPS) (Textuals) [Abstract]
Antidilutive shares excluded from EPS calculation	0.4	0.3		0.4	0.3
EPS numerator:
Loss from continuing operations, net of income taxes	$ (95.6)	$ (144.4)	$ (253.9)	$ (488.1)	$ (1,316)
Less: Net income attributable to noncontrolling interests	1.8	2.8	$ 3.5	3.5	7.9
Loss from continuing operations attributable to common stockholders, after allocation of earnings to participating securities	(97.4)	(147.2)		(491.6)	(1,323.9)
Loss from discontinued operations attributable to common stockholders, after allocation of earnings to participating securities	(38.1)	(157.5)		(44.5)	(202.7)
Net loss attributable to common stockholders, after earnings allocated to participating securities	$ (135.5)	$ (304.7)		$ (536.1)	$ (1,526.6)
EPS denominator:
Weighted Average Number of Shares Outstanding, Basic	18.3	18.2		18.3	18.1
Weighted Average Number of Shares Outstanding, Diluted	18.3	18.2		18.3	18.1
Basic EPS attributable to common stockholders:
Loss from continuing operations	$ (5.32)	$ (8.08)		$ (26.88)	$ (73.05)
Loss from discontinued operations	(2.09)	(8.65)		(2.43)	(11.18)
Net loss attributable to common stockholders	(7.41)	(16.73)		(29.31)	(84.23)
Diluted EPS attributable to common stockholders:
Loss from continuing operations	(5.32)	(8.08)		(26.88)	(73.05)
Loss from discontinued operations	(2.09)	(8.65)		(2.43)	(11.18)
Net loss attributable to common stockholders	(7.41)	(16.73)		(29.31)	(84.23)
Common Stock [Member]
Earnings Per Share [Line Items]
Common Stock, par value per share	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01

Financial Instruments, Guaran77

Financial Instruments, Guarantees with Off-Balance-Sheet Risk and Other Guarantees (Details) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)	Jul. 26, 2016USD ($)	Apr. 18, 2016USD ($)	Apr. 15, 2016USD ($)	Apr. 13, 2016USD ($)	Dec. 31, 2015USD ($)
Guarantee Obligations [Line Items]
Financial instruments with off-balance sheet risk		$ 1,932		$ 1,932
Letters of credit in support of reclamation obligations or activities		15.7		15.7
Letters of credit outstanding, amount		144.9		144.9
Amount in bank guarantees, letters of credit and surety bonds related to collateral for road maintenance, performance guarantees and other operations		108.9		108.9
Financial Instruments, Guarantees with Off-Balance-Sheet Risk and Other Guarantees (Textuals) [Abstract]
Maximum capacity of the securitization program		180		180						$ 275
Restricted cash and cash equivalents		22.8		22.8
Total consideration received by Company related to accounts receivable sold under securitization program				2,109.6
Cash up front from sale of receivables				1,102.6
Additional cash upon collection of underlying receivables				836.4
Non-collected receivables		170.6		170.6
Reduction in accounts receivable as a result of securitization activity		0		0						168.5
Expense associated with securitization transactions		2.4	$ 0.5	5.6	$ 1.3
DTA and PBGC
Guarantee Obligations [Line Items]
Letters of credit outstanding, amount		$ 37		$ 37
Dominion Terminal Associates Partnership
Financial Instruments, Guarantees with Off-Balance-Sheet Risk and Other Guarantees (Textuals) [Abstract]
Ownership Percentage in DTA		37.50%		37.50%
DTA lease term (years)		30		30
Pension Plans Agreement With PBGC and TXU Europe
Financial Instruments, Guarantees with Off-Balance-Sheet Risk and Other Guarantees (Textuals) [Abstract]
Defined benefit pension plans requiring special contributions		2		2
Letter of credit maintained by the Company in favor of the PBGC		$ 37		$ 37
Guarantee in place from TXU Europe Limited		110		110
Reclamation Obligations
Guarantee Obligations [Line Items]
Financial instruments with off-balance sheet risk		1,618.3		1,618.3
Lease Obligations
Guarantee Obligations [Line Items]
Financial instruments with off-balance sheet risk		96.7		96.7
Workers' Compensation Obligations
Guarantee Obligations [Line Items]
Financial instruments with off-balance sheet risk		71.1		71.1
Other
Guarantee Obligations [Line Items]
Financial instruments with off-balance sheet risk	[1]	145.9		145.9
Financial Standby Letter of Credit [Member]
Guarantee Obligations [Line Items]
Financial instruments with off-balance sheet risk		315		315
Self bonding
Guarantee Obligations [Line Items]
Financial instruments with off-balance sheet risk		1,127.5		1,127.5
Self bonding | Reclamation Obligations
Guarantee Obligations [Line Items]
Financial instruments with off-balance sheet risk		1,127.5		1,127.5
Self bonding | Lease Obligations
Guarantee Obligations [Line Items]
Financial instruments with off-balance sheet risk		0		0
Self bonding | Workers' Compensation Obligations
Guarantee Obligations [Line Items]
Financial instruments with off-balance sheet risk		0		0
Self bonding | Other
Guarantee Obligations [Line Items]
Financial instruments with off-balance sheet risk	[1]	0		0
Self bonding | Financial Standby Letter of Credit [Member]
Guarantee Obligations [Line Items]
Financial instruments with off-balance sheet risk		0		0
Surety bonds
Guarantee Obligations [Line Items]
Financial instruments with off-balance sheet risk		451.2		451.2
Surety bonds | Reclamation Obligations
Guarantee Obligations [Line Items]
Financial instruments with off-balance sheet risk		320.1		320.1
Surety bonds | Lease Obligations
Guarantee Obligations [Line Items]
Financial instruments with off-balance sheet risk		96.7		96.7
Surety bonds | Workers' Compensation Obligations
Guarantee Obligations [Line Items]
Financial instruments with off-balance sheet risk		19.1		19.1
Surety bonds | Other
Guarantee Obligations [Line Items]
Financial instruments with off-balance sheet risk	[1]	15.3		15.3
Surety bonds | Financial Standby Letter of Credit [Member]
Guarantee Obligations [Line Items]
Financial instruments with off-balance sheet risk		112.6		112.6
Bank guarantees
Guarantee Obligations [Line Items]
Financial instruments with off-balance sheet risk		196.8		196.8
Bank guarantees | Reclamation Obligations
Guarantee Obligations [Line Items]
Financial instruments with off-balance sheet risk		170.7		170.7
Bank guarantees | Lease Obligations
Guarantee Obligations [Line Items]
Financial instruments with off-balance sheet risk		0		0
Bank guarantees | Workers' Compensation Obligations
Guarantee Obligations [Line Items]
Financial instruments with off-balance sheet risk		0		0
Bank guarantees | Other
Guarantee Obligations [Line Items]
Financial instruments with off-balance sheet risk	[1]	26.1		26.1
Bank guarantees | Financial Standby Letter of Credit [Member]
Guarantee Obligations [Line Items]
Financial instruments with off-balance sheet risk		202.4		202.4
Standby Letters of Credit [Member]
Guarantee Obligations [Line Items]
Financial instruments with off-balance sheet risk		156.5		156.5
Standby Letters of Credit [Member] | Reclamation Obligations
Guarantee Obligations [Line Items]
Financial instruments with off-balance sheet risk		0		0
Standby Letters of Credit [Member] | Lease Obligations
Guarantee Obligations [Line Items]
Financial instruments with off-balance sheet risk		0		0
Standby Letters of Credit [Member] | Workers' Compensation Obligations
Guarantee Obligations [Line Items]
Financial instruments with off-balance sheet risk		52		52
Standby Letters of Credit [Member] | Other
Guarantee Obligations [Line Items]
Financial instruments with off-balance sheet risk	[1]	104.5		104.5
Standby Letters of Credit [Member] | Financial Standby Letter of Credit [Member]
Guarantee Obligations [Line Items]
Financial instruments with off-balance sheet risk		0		0
Performance guarantee for third-party coal producer
Financial Instruments, Guarantees with Off-Balance-Sheet Risk and Other Guarantees (Textuals) [Abstract]
Carrying amount of guarantee liability for reclamation and bonding commitments		(38.4)		$ (38.4)						$ (38.4)
Scenario, Actual [Member] | Dominion Terminal Associates Partnership
Financial Instruments, Guarantees with Off-Balance-Sheet Risk and Other Guarantees (Textuals) [Abstract]
Repayments of lines of credit		39.9
Line of Credit Assumed		$ 42.7
DIP Facility - Initially Available [Member]
Guarantee Obligations [Line Items]
Long-term debt							$ 200	$ 200	$ 200
Wyoming [Member] | Self bonding | Reclamation Obligations
Guarantee Obligations [Line Items]
Letters of credit in support of reclamation obligations or activities						$ 0.8
Indiana [Member] | Self bonding | Reclamation Obligations
Guarantee Obligations [Line Items]
Letters of credit in support of reclamation obligations or activities						7.5
Illinois [Member] | Self bonding | Reclamation Obligations
Guarantee Obligations [Line Items]
Letters of credit in support of reclamation obligations or activities						$ 3.2
[1]	Other includes the $37.0 million in letters of credit related to TXU Europe Limited described below and an additional $108.9 million in bank guarantees, letters of credit and surety bonds related to collateral for road maintenance, performance guarantees and other operations.

Commitments and Contingencies (

Commitments and Contingencies (Details 1) $ in Millions	Sep. 30, 2016USD ($)
Capital Addition Purchase Commitments [Member]
Long-term Purchase Commitment [Line Items]
Purchase commitments for capital expenditures	$ 12.6

Commitments and Contingencies79

Commitments and Contingencies (Details 2) AUD in Millions, $ in Millions	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2016USD ($)	Sep. 30, 2016AUDsites	Sep. 30, 2015USD ($)	Dec. 31, 2015USD ($)	Oct. 07, 2016USD ($)	Sep. 30, 2016AUD
Loss Contingency [Abstract]
Senior Notes					$ 287
Monto Coal Pty Limited [Member]
Loss Contingency [Abstract]
Ownership percentage in subsidiaries	51.00%					51.00%
Loss Contingency Damages Sought Minimum | AUD		AUD 15.6
Loss Contingency Damages Sought Value Max | AUD		1,800
Wilkie Creek [Member]
Loss Contingency [Abstract]
Damages sought | AUD		113.1
Potential Annual Payments Awarded | AUD		11.8
Payment Sought by Australia Supreme Court | AUD		AUD 11.8
Charge to discontinued operations			$ 7.6	$ 9.7
Settlement charges total	$ 9.9					AUD 13
Gold Fields [Member]
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) | sites		4
Undiscounted environmental clean-up liabilities, total	62.9			$ 66.9
Senior Notes [Member]
Loss Contingency [Abstract]
Debt Instrument, Face Amount	1,650
Berenergy [Member]
Loss Contingency [Abstract]
Litigation Settlement Damages Awarded to Plaintiff	0.9
Loss Contingency Accrual	13.1
Bankruptcy unliquidated, general unsecured claim [Member] | Blue Tee [Member]
Loss Contingency [Abstract]
Bankruptcy Claims, Amount of Claims Filed	65.6
Bankruptcy additional unliquidated, in an unknown amount [Member] | Blue Tee [Member]
Loss Contingency [Abstract]
Bankruptcy Claims, Amount of Claims Filed	150
Bankruptcy further contingent claims, at known and unknown sites [Member] | Blue Tee [Member]
Loss Contingency [Abstract]
Bankruptcy Claims, Amount of Claims Filed	500
Bankruptcy unliquidated, secured and general unsecured [Member] | Gold Fields [Member]
Loss Contingency [Abstract]
Bankruptcy Claims, Amount of Claims Filed	$ 2,700

Matters Related to the Bankru80

Matters Related to the Bankruptcy of Patriot Coal Corporation (Patriot) (Details) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended				48 Months Ended
	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2017USD ($)	Jan. 31, 2014USD ($)
Matters Related to the Bankruptcy of Patriot Coal Corporation (Patriot) [Line Items]
Credit support to Patriot net letters of credit	$ 20.9		$ 20.9	$ 20.9
Letters of credit in support of reclamation obligations or activities	15.7		15.7	15.7
Potential exposure from Patriot bankruptcy	150		150	150
Black Lung Liability, Outstanding	$ 132.9		$ 132.9	132.9
Black Lung Liability Future Cost, Lower Estimate				10
Black Lung Liability Future Costs, Upper Estimate				$ 15
Number of VEBA payments from Patriot settlement	4		4	4
Initial payment based on the negotiated settlement											$ 90
Payment to Patriot based on the construct of the negotiated settlement											$ 70
Payment to the VEBA based on the construct of the negotiated settlement				$ 75				$ 75	$ 20
Gain on VEBA settlement				68.1	$ 0
Withdrawal liability related to pension plan	$ 767		$ 767	767
Peabody's share of the withdrawal liability related to the pension plan as estimated by the plaintiffs	644.2		644.2	644.2
Peabody's withdrawal liability related to the pension plan claim in bankruptcy court	642.7		642.7	642.7
Loss from discontinued operations, net of income taxes	(38.1)	$ (157.5)	(40.5)	(44.5)	$ (202.7)
Accounts payable and accrued expenses	30.2		30.2	30.2				60
Liabilities subject to compromise	8,331.6		8,331.6	8,331.6				$ 0
Scenario, Forecast [Member]
Matters Related to the Bankruptcy of Patriot Coal Corporation (Patriot) [Line Items]
Funding of the newly established VEBA										$ 310
Payment to the VEBA based on the construct of the negotiated settlement						$ 70	$ 75
Scenario, Forecast (Monthly) [Member]
Matters Related to the Bankruptcy of Patriot Coal Corporation (Patriot) [Line Items]
Payment to the VEBA based on the construct of the negotiated settlement				7.5
United Mine Workers of America [Member]
Matters Related to the Bankruptcy of Patriot Coal Corporation (Patriot) [Line Items]
Loss from discontinued operations, net of income taxes	35
Accounts payable and accrued expenses	10		10	10
Liabilities subject to compromise	$ 25		$ 25	$ 25

Segment Information (Details)

Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2016		Sep. 30, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Gain on VEBA settlement				$ 68.1		$ 0
Total Assets	$ 12,235.2		$ 12,235.2	12,235.2			$ 10,946.9
Reportable segment results
Revenues	1,207.1	$ 1,418.9	2,123.9	3,274.5		4,296.1
Adjusted EBITDA	108.3	129		188.9		381.6
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations, Net of Income Taxes [Abstract]
Depreciation, depletion and amortization	(117.8)	(136)	(216.8)	(345.5)		(430.6)
Asset impairment	0	0		(17.2)		(900.8)
Asset retirement obligation expenses	(12.7)	(12.3)	(22.4)	(37.3)		(40.4)
Selling and Administrative expenses related to debt restructuring	0	0		(21.5)		0
Amortization of basis difference related to equity affiliates	0	(0.7)		0		(4.2)
Interest expense	(58.5)	(118.5)	(95.5)	(243.7)		(344)
Loss on early debt extinguishment	0	0		0		(67.8)
Interest income	1.3	1.4	2.3	4		6.6
Reorganization Items, net	(29.7)	0	125.1	(125.1)		0
Income tax (benefit) provision	12.9	(6.9)	30.9	108.7		83.2
Loss from continuing operations, net of income taxes	(95.6)	(144.4)	$ (253.9)	(488.1)		(1,316)
Powder River Basin Mining [Member]
Reportable segment results
Revenues	419.6	475		1,062.2		1,393.9
Adjusted EBITDA	123.9	120		278.3		354.7
Midwestern U.S. Mining [Member]
Reportable segment results
Revenues	211	249.4		599.6		768.2
Adjusted EBITDA	59.1	72.3		172.4		218.6
Western U.S. Mining [Member]
Reportable segment results
Revenues	162.4	177.3		387		526.9
Adjusted EBITDA	34.3	45.7		83.2		147.7
Australian Metallurgical Mining [Member]
Reportable segment results
Revenues	232.5	280.4		682.8		924.6
Adjusted EBITDA	(34.5)	(15.4)		(121)		(2.2)
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations, Net of Income Taxes [Abstract]
Asset impairment						(527)
Australian Thermal Mining [Member]
Reportable segment results
Revenues	197.9	205.3		561.4		615.2
Adjusted EBITDA	48.9	49.4		137.2		153.9
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations, Net of Income Taxes [Abstract]
Asset impairment						(8.2)
Trading and Brokerage [Member]
Reportable segment results
Revenues	(19.2)	24.5		(32.6)		42.7
Adjusted EBITDA	(31.3)	29.4		(90.4)		30.4
Corporate and Other [Member]
Reportable segment results
Revenues	2.9	7		14.1		24.6
Adjusted EBITDA	(92.1)	(172.4)		(270.8)	[1]	(521.5)
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations, Net of Income Taxes [Abstract]
Asset impairment						(365.6)
Middlemount Mine [Member]
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations, Net of Income Taxes [Abstract]
Change in deferred tax asset valuation allowance related to equity affiliates	$ 0.6	$ (0.4)		$ 0.6		$ 0.4
[1]	(1) Includes a gain of $68.1 million during the nine months ended September 30, 2016 related to the 2016 Settlement Agreement described in Note 20 "Matters related to the Bankruptcy of Patriot Coal Corporation"

Supplemental Guarantor_Non-Gu82

Supplemental Guarantor/Non-Guarantor Financial Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2015
Revenues	$ 1,207.1	$ 1,418.9	$ 2,123.9	$ 3,274.5	$ 4,296.1
Operating Costs and Expenses	1,064.8	1,254	1,909.5	2,981.2	3,774.4
Depreciation, Depletion and Amortization	117.8	136	216.8	345.5	430.6
Asset retirement obligation expenses	12.7	12.3	22.4	37.3	40.4
Selling and administrative expenses	32.1	37.8	51.9	114.6	128.8
Selling and Administrative expenses related to debt restructuring	0	0		21.5	0
Restructuring charges	0.3	1.8	2.8	15.5	23
Net gain on disposal of assets	1.9	7.9	15.6	17.4	20.2
Restructuring Costs and Asset Impairment Charges	0	0		17.2	900.8
Asset impairment	0	0		17.2	900.8
Loss from equity affiliates	(2.9)	(5.3)	(2.6)	(12.6)	(12.3)
Interest expense	58.5	118.5	95.5	243.7	344
Loss on early debt extinguishment	0	0		0	67.8
Interest income	1.3	1.4	2.3	4	6.6
Reorganization Items, net	29.7	0	(125.1)	125.1	0
Income (Loss) from Continuing Operations before Income Taxes	(108.5)	(137.5)	(284.8)	(596.8)	(1,399.2)
Income tax (benefit) provision	(12.9)	6.9	(30.9)	(108.7)	(83.2)
Loss from continuing operations, net of income taxes	(95.6)	(144.4)	(253.9)	(488.1)	(1,316)
Loss from discontinued operations, net of income taxes	(38.1)	(157.5)	(40.5)	(44.5)	(202.7)
Net loss	(133.7)	(301.9)	(294.4)	(532.6)	(1,518.7)
Net Income (Loss) Attributable to Noncontrolling Interest	1.8	2.8	3.5	3.5	7.9
Net Income (Loss) Attributable to Common Stockholder	(135.5)	(304.7)	(297.9)	(536.1)	(1,526.6)
Other Comprehensive Income (Loss), Net of Tax	35	(51)		132.2	69
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	(98.7)	(352.9)		(400.4)	(1,449.7)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	1.8	2.8		3.5	7.9
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	(100.5)	(355.7)		(403.9)	(1,457.6)
Parent Company [Member]
Revenues	0	0		0	0
Operating Costs and Expenses	47.4	116.8		129.7	326.9
Depreciation, Depletion and Amortization	0	0		0	0
Asset retirement obligation expenses	0	0		0	0
Selling and administrative expenses	3.7	6.5		8.8	24.3
Restructuring charges	0	0		0	(3.9)
Net gain on disposal of assets	0	(0.1)		0	2.3
Restructuring Costs and Asset Impairment Charges				0
Asset impairment					0
Loss from equity affiliates	14	100.7		(89.8)	(594.9)
Interest expense	56.1	120.4		234.5	348.3
Loss on early debt extinguishment					67.8
Interest income	0	0.1		0.2	0.5
Reorganization Items, net	(0.8)			74.1
Income (Loss) from Continuing Operations before Income Taxes	(92.4)	(143)		(536.7)	(1,355.5)
Income tax (benefit) provision	6.2	4.6		(41.8)	(20.6)
Loss from continuing operations, net of income taxes	(98.6)	(147.6)		(494.9)	(1,334.9)
Loss from discontinued operations, net of income taxes	(36.9)	(157.1)		(41.2)	(191.7)
Net loss	(135.5)	(304.7)		(536.1)	(1,526.6)
Net Income (Loss) Attributable to Noncontrolling Interest	0	0		0	0
Net Income (Loss) Attributable to Common Stockholder	(135.5)	(304.7)		(536.1)	(1,526.6)
Other Comprehensive Income (Loss), Net of Tax	35	(51)		132.2	69
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	(100.5)	(355.7)		(403.9)	(1,457.6)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	0	0		0	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	(100.5)	(355.7)		(403.9)	(1,457.6)
Guarantor Subsidiaries [Member]
Revenues	800.7	902.4		2,087.2	2,699.7
Operating Costs and Expenses	598.7	710.6		1,597.3	2,109.8
Depreciation, Depletion and Amortization	55.9	62		157.6	189.2
Asset retirement obligation expenses	5.4	4.2		17.3	13.9
Selling and administrative expenses	23.4	28.6		95.8	95.3
Restructuring charges	0.1	0.8		11.9	11
Net gain on disposal of assets	1.8	6.6		14.5	16.9
Restructuring Costs and Asset Impairment Charges				0
Asset impairment					(182.2)
Loss from equity affiliates	(0.7)	(1.8)		(2.8)	(4.7)
Interest expense	4.7	4.4		15.1	13.5
Loss on early debt extinguishment					0
Interest income	1.2	0.5		3.2	1.8
Reorganization Items, net	29.7			47.8
Income (Loss) from Continuing Operations before Income Taxes	85.1	97.1		159.3	98.8
Income tax (benefit) provision	(23.7)	1.8		(70.5)	(63)
Loss from continuing operations, net of income taxes	108.8	95.3		229.8	161.8
Loss from discontinued operations, net of income taxes	(0.3)	(0.3)		(1.4)	(2.2)
Net loss	108.5	95		228.4	159.6
Net Income (Loss) Attributable to Noncontrolling Interest	0	(0.2)		0	0.5
Net Income (Loss) Attributable to Common Stockholder	108.5	95.2		228.4	159.1
Other Comprehensive Income (Loss), Net of Tax	5.1	12.1		15.4	31.1
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	113.6	107.1		243.8	190.7
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	0	(0.2)		0	0.5
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	113.6	107.3		243.8	190.2
Non-Guarantor Subsidiaries [Member]
Revenues	497	640.4		1,421.6	1,951.1
Operating Costs and Expenses	509.3	550.5		1,488.5	1,692.4
Depreciation, Depletion and Amortization	61.9	74		187.9	241.4
Asset retirement obligation expenses	7.3	8.1		20	26.5
Selling and administrative expenses	5	2.7		10	9.2
Restructuring charges	0.2	1		3.6	15.9
Net gain on disposal of assets	0.1	1.4		2.9	1
Restructuring Costs and Asset Impairment Charges				17.2
Asset impairment					(718.6)
Loss from equity affiliates	(2.2)	(3.5)		(9.8)	(7.6)
Interest expense	6.5	2.4		19.3	7.9
Loss on early debt extinguishment					0
Interest income	8.9	9.5		25.8	30
Reorganization Items, net	0.8			3.2
Income (Loss) from Continuing Operations before Income Taxes	(87.2)	9.1		(309.2)	(737.4)
Income tax (benefit) provision	4.6	0.5		3.6	0.4
Loss from continuing operations, net of income taxes	(91.8)	8.6		(312.8)	(737.8)
Loss from discontinued operations, net of income taxes	(0.9)	(0.1)		(1.9)	(8.8)
Net loss	(92.7)	8.5		(314.7)	(746.6)
Net Income (Loss) Attributable to Noncontrolling Interest	1.8	3		3.5	7.4
Net Income (Loss) Attributable to Common Stockholder	(94.5)	5.5		(318.2)	(754)
Other Comprehensive Income (Loss), Net of Tax	1.5	(26.9)		2.4	(67.7)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	(91.2)	(18.4)		(312.3)	(814.3)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	1.8	3		3.5	7.4
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	(93)	(21.4)		(315.8)	(821.7)
Consolidation, Eliminations [Member]
Revenues	(90.6)	(123.9)	(2.6)	(234.3)	(354.7)
Operating Costs and Expenses	(90.6)	(123.9)	(2.6)	(234.3)	(354.7)
Depreciation, Depletion and Amortization	0	0	0	0	0
Asset retirement obligation expenses	0	0	0	0	0
Selling and administrative expenses	0	0	0	0	0
Restructuring charges	0	0	0	0	0
Net gain on disposal of assets	0	0	0	0	0
Restructuring Costs and Asset Impairment Charges				0
Asset impairment					0
Loss from equity affiliates	(14)	(100.7)	188.2	89.8	594.9
Interest expense	(8.8)	(8.7)	(6)	(25.2)	(25.7)
Loss on early debt extinguishment					0
Interest income	(8.8)	(8.7)	(6)	(25.2)	(25.7)
Reorganization Items, net	0		0	0
Income (Loss) from Continuing Operations before Income Taxes	(14)	(100.7)	188.2	89.8	594.9
Income tax (benefit) provision	0	0	0	0	0
Loss from continuing operations, net of income taxes	(14)	(100.7)	188.2	89.8	594.9
Loss from discontinued operations, net of income taxes	0	0	0	0	0
Net loss	(14)	(100.7)	188.2	89.8	594.9
Net Income (Loss) Attributable to Noncontrolling Interest	0	0	0	0	0
Net Income (Loss) Attributable to Common Stockholder	(14)	(100.7)	$ 188.2	89.8	594.9
Other Comprehensive Income (Loss), Net of Tax	(6.6)	14.8		(17.8)	36.6
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	(20.6)	(85.9)		72	631.5
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	0	0		0	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ (20.6)	$ (85.9)		$ 72	$ 631.5

Supplemental Guarantor_Non-Gu83

Supplemental Guarantor/Non-Guarantor Financial Information (Details 1) - USD ($) $ in Millions	Sep. 30, 2016	Apr. 12, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Cash and Cash Equivalents, at Carrying Value	$ 1,167.8	$ 652.1	$ 261.3	$ 334.3	$ 298
Restricted Cash and Investments, Current	24.2		0
Accounts receivable, net	351.9		228.8
Accounts Receivable, Related Parties, Current	0		0
Inventory, Net	259.6		307.8
Assets From Coal Trading Activities, Net	19.9		23.5
Deferred Tax Assets, Net of Valuation Allowance, Current	53.5		53.5
Other current assets	368.9		447.6
Assets, Current	2,245.8		1,322.5
Property, Plant and Equipment, Net	9,215.5		9,258.5
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	2.3		2.2
Investments and other assets	771.6		363.7
Notes Receivable, Related Parties	0		0
Total assets	12,235.2		10,946.9
Current portion of long-term debt	493.1		5,874.9
Accounts Payable, Related Parties, Current	0		0
Deferred Tax Liabilities, Net, Current	4.1		3.8
Liabilities from coal trading activities, net	19.5		15.6
Accounts Payable and Accrued Liabilities, Current	835.9		1,446.3
Accounts Payable and Other Accrued Liabilities, Current	831.8		1,442.5
Liabilities, Current	1,348.5		7,336.8
Long-term debt, less current portion	0		366.3
Deferred income taxes	107.6		69.1
Notes Payable, Related Parties, Noncurrent	0		0
Other Noncurrent Liability	1,923.6		2,256.2
Total liabilities not subject to compromise	3,379.7		10,028.4
Liabilities subject to compromise	8,331.6		0
Total liabilities	11,711.3		10,028.4
Stockholders' Equity Attributable to Parent	520.7		916.9
Stockholders' Equity Attributable to Noncontrolling Interest	3.2		1.6
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	523.9		918.5
Liabilities and Equity	12,235.2		10,946.9
Parent Company [Member]
Cash and Cash Equivalents, at Carrying Value	687.5		7.2	144.2	188.7
Restricted Cash and Investments, Current	1.4
Accounts receivable, net	0		0
Accounts Receivable, Related Parties, Current	1,035.2		582.1
Inventory, Net	0		0
Assets From Coal Trading Activities, Net	0		0
Deferred Tax Assets, Net of Valuation Allowance, Current	0		0
Other current assets	22.1		23.1
Assets, Current	1,746.2		612.4
Property, Plant and Equipment, Net	0		0
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	0		0
Investments and other assets	8,761.5		8,476.2
Notes Receivable, Related Parties	0		0
Total assets	10,507.7		9,088.6
Current portion of long-term debt	470.5		5,844
Accounts Payable, Related Parties, Current	0		0
Deferred Tax Liabilities, Net, Current	11.8		11.8
Liabilities from coal trading activities, net	0		0
Accounts Payable and Accrued Liabilities, Current	47.5		494.8
Liabilities, Current	529.8		6,350.6
Long-term debt, less current portion			366.3
Deferred income taxes	165.8		98.6
Notes Payable, Related Parties, Noncurrent	1,032.6		1,032.6
Other Noncurrent Liability	154.8		323.6
Total liabilities not subject to compromise	1,883
Liabilities subject to compromise	8,104
Total liabilities	9,987		8,171.7
Stockholders' Equity Attributable to Parent	520.7		916.9
Stockholders' Equity Attributable to Noncontrolling Interest	0		0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	520.7		916.9
Liabilities and Equity	10,507.7		9,088.6
Guarantor Subsidiaries [Member]
Cash and Cash Equivalents, at Carrying Value	3.1		4.7	4.2	3.6
Restricted Cash and Investments, Current	0
Accounts receivable, net	22.4		12.1
Accounts Receivable, Related Parties, Current	0		0
Inventory, Net	86.7		109.4
Assets From Coal Trading Activities, Net	0.1		3.2
Deferred Tax Assets, Net of Valuation Allowance, Current	65.3		65.3
Other current assets	107.9		128.1
Assets, Current	285.5		322.8
Property, Plant and Equipment, Net	4,419.3		4,304.8
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	63.2		33.1
Investments and other assets	3.7		3.6
Notes Receivable, Related Parties	877		632.7
Total assets	5,648.7		5,297
Current portion of long-term debt	20.5		23.8
Accounts Payable, Related Parties, Current	1,668.6		1,530.2
Deferred Tax Liabilities, Net, Current	0		0
Liabilities from coal trading activities, net	0.1		4.8
Accounts Payable and Accrued Liabilities, Current	380.6		479.8
Liabilities, Current	2,069.8		2,038.6
Long-term debt, less current portion			0
Deferred income taxes	0		0
Notes Payable, Related Parties, Noncurrent	0		0
Other Noncurrent Liability	1,277.7		1,454.9
Total liabilities not subject to compromise	3,347.5
Liabilities subject to compromise	209
Total liabilities	3,556.5		3,493.5
Stockholders' Equity Attributable to Parent	2,092.2		1,803.5
Stockholders' Equity Attributable to Noncontrolling Interest	0		0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	2,092.2		1,803.5
Liabilities and Equity	5,648.7		5,297
Non-Guarantor Subsidiaries [Member]
Cash and Cash Equivalents, at Carrying Value	477.2		249.4	$ 185.9	$ 105.7
Restricted Cash and Investments, Current	22.8
Accounts receivable, net	329.5		216.7
Accounts Receivable, Related Parties, Current	633.4		948.1
Inventory, Net	172.9		198.4
Assets From Coal Trading Activities, Net	19.8		20.3
Deferred Tax Assets, Net of Valuation Allowance, Current	0		0
Other current assets	238.9		296.4
Assets, Current	1,894.5		1,929.3
Property, Plant and Equipment, Net	4,796.2		4,953.7
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	2.3		0
Investments and other assets	501.1		185.5
Notes Receivable, Related Parties	155.6		399.9
Total assets	7,349.7		7,468.4
Current portion of long-term debt	2.1		7.1
Accounts Payable, Related Parties, Current	0		0
Deferred Tax Liabilities, Net, Current	4.1		3.8
Liabilities from coal trading activities, net	19.4		10.8
Accounts Payable and Accrued Liabilities, Current	403.7		467.9
Liabilities, Current	429.3		489.6
Long-term debt, less current portion			0
Deferred income taxes	5		1.4
Notes Payable, Related Parties, Noncurrent	0		0
Other Noncurrent Liability	491.1		477.7
Total liabilities not subject to compromise	925.4
Liabilities subject to compromise	18.6
Total liabilities	944		968.7
Stockholders' Equity Attributable to Parent	6,402.5		6,498.1
Stockholders' Equity Attributable to Noncontrolling Interest	3.2		1.6
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	6,405.7		6,499.7
Liabilities and Equity	7,349.7		7,468.4
Consolidation, Eliminations [Member]
Cash and Cash Equivalents, at Carrying Value	0		0
Restricted Cash and Investments, Current	0
Accounts receivable, net	0		0
Accounts Receivable, Related Parties, Current	(1,668.6)		(1,530.2)
Inventory, Net	0		0
Assets From Coal Trading Activities, Net	0		0
Deferred Tax Assets, Net of Valuation Allowance, Current	(11.8)		(11.8)
Other current assets	0		0
Assets, Current	(1,680.4)		(1,542)
Property, Plant and Equipment, Net	0		0
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	(63.2)		(30.9)
Investments and other assets	(8,494.7)		(8,301.6)
Notes Receivable, Related Parties	(1,032.6)		(1,032.6)
Total assets	(11,270.9)		(10,907.1)
Current portion of long-term debt	0		0
Accounts Payable, Related Parties, Current	(1,668.6)		(1,530.2)
Deferred Tax Liabilities, Net, Current	(11.8)		(11.8)
Liabilities from coal trading activities, net	0		0
Accounts Payable and Accrued Liabilities, Current	0		0
Liabilities, Current	(1,680.4)		(1,542)
Long-term debt, less current portion			0
Deferred income taxes	(63.2)		(30.9)
Notes Payable, Related Parties, Noncurrent	(1,032.6)		(1,032.6)
Other Noncurrent Liability	0		0
Total liabilities not subject to compromise	(2,776.2)
Liabilities subject to compromise	0
Total liabilities	(2,776.2)		(2,605.5)
Stockholders' Equity Attributable to Parent	(8,494.7)		(8,301.6)
Stockholders' Equity Attributable to Noncontrolling Interest	0		0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(8,494.7)		(8,301.6)
Liabilities and Equity	$ (11,270.9)		$ (10,907.1)

Supplemental Guarantor_Non-Gu84

Supplemental Guarantor/Non-Guarantor Financial Information (Details 2) - USD ($) $ in Millions	6 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	Apr. 12, 2016	Dec. 31, 2015	Dec. 31, 2014
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	$ 254.9	$ (257.9)	$ (62)
Cash Provided by (Used in) Operating Activities, Discontinued Operations	(18.2)	(18.9)	(28.6)
Net Cash Provided by (Used in) Operating Activities	236.7	(276.8)	(90.6)
Additions to property, plant, equipment and mine development	(36.7)	(56.6)	(76.9)
Changes in accrued expenses related to capital expenditures	(1.5)	(5.5)	(14.5)
Federal coal lease expenditures		(249)	(89.8)
Proceeds from disposal of assets, net of notes receivable	132.5	134.7	39.6
Payments to Acquire Marketable Securities		0	22.6
Proceeds from Sale and Maturity of Marketable Securities		0	33.6
Contributions to joint ventures	(140.5)	(241.7)	(349.8)
Distributions from joint ventures	139.7	236.7	339.8
Increase (Decrease) in Due to Related Parties	(22.7)	(23.3)	(3.6)
Increase (Decrease) in Due from Related Parties	11.9	13.2	0
Other, net	(2.9)	(8.2)	(2.1)
Net Cash Provided by (Used in) Investing Activities, Continuing Operations	(168.7)
Net Cash Provided by (Used in) Investing Activities		(199.7)	(146.3)
Proceeds from long-term debt	482.8	1,429.8	975.7
Repayments of long-term debt	(4.1)	(11.2)	(666)
Payment of deferred financing costs	(27)	(29.8)	(28.7)
Payments of Ordinary Dividends, Common Stock		0	1.4
Payments For Repurchase Of Common Stock Relinquished For Tax Withholding		0.1
Distributions to noncontrolling interests	(3.9)	(3.9)	(2.1)
Other, net	(0.1)	(1.9)	(4.3)
Transactions With Affiliates Net	0	0	0
Net Cash Provided by (Used in) Financing Activities	447.7	1,383	273.2
Cash and Cash Equivalents, Period Increase (Decrease)	515.7	906.5	36.3
Cash and Cash Equivalents, at Carrying Value	1,167.8	1,167.8	334.3	$ 652.1	$ 261.3	$ 298
Parent Company [Member]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations		(249.9)	(649)
Cash Provided by (Used in) Operating Activities, Discontinued Operations		(5.1)	(23.2)
Net Cash Provided by (Used in) Operating Activities		(255)	(672.2)
Additions to property, plant, equipment and mine development		0	0
Changes in accrued expenses related to capital expenditures		0	0
Federal coal lease expenditures		0	0
Proceeds from disposal of assets, net of notes receivable		0	0
Payments to Acquire Marketable Securities			0
Proceeds from Sale and Maturity of Marketable Securities			0
Contributions to joint ventures		0	0
Distributions from joint ventures		0	0
Increase (Decrease) in Due to Related Parties		0	0
Other, net		0	0
Net Cash Provided by (Used in) Investing Activities		0	0
Proceeds from long-term debt		1,422	975.7
Repayments of long-term debt		(3)	(659)
Payment of deferred financing costs		(25.6)	(28.7)
Payments of Ordinary Dividends, Common Stock			1.4
Distributions to noncontrolling interests		0	0
Other, net		0	1.4
Transactions With Affiliates Net		(458.1)	339.7
Net Cash Provided by (Used in) Financing Activities		935.3	627.7
Cash and Cash Equivalents, Period Increase (Decrease)		680.3	(44.5)
Cash and Cash Equivalents, at Carrying Value	687.5	687.5	144.2		7.2	188.7
Guarantor Subsidiaries [Member]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations		89.3	437
Cash Provided by (Used in) Operating Activities, Discontinued Operations		(13.1)	(2.8)
Net Cash Provided by (Used in) Operating Activities		76.2	434.2
Additions to property, plant, equipment and mine development		(26.3)	(44.8)
Changes in accrued expenses related to capital expenditures		(1.1)	(3.4)
Federal coal lease expenditures		(249)	(89.8)
Proceeds from disposal of assets, net of notes receivable		68.4	7.6
Payments to Acquire Marketable Securities			0
Proceeds from Sale and Maturity of Marketable Securities			0
Contributions to joint ventures		0	0
Distributions from joint ventures		0	0
Increase (Decrease) in Due to Related Parties		0	0
Other, net		(4.6)	(1.8)
Net Cash Provided by (Used in) Investing Activities		(212.6)	(132.2)
Proceeds from long-term debt		0	0
Repayments of long-term debt		(3.3)	(0.6)
Payment of deferred financing costs		0	0
Payments of Ordinary Dividends, Common Stock			0
Distributions to noncontrolling interests		0	0
Other, net		(1.9)	(1.6)
Transactions With Affiliates Net		140	(299.2)
Net Cash Provided by (Used in) Financing Activities		134.8	(301.4)
Cash and Cash Equivalents, Period Increase (Decrease)		(1.6)	0.6
Cash and Cash Equivalents, at Carrying Value	3.1	3.1	4.2		4.7	3.6
Non-Guarantor Subsidiaries [Member]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations		(97.3)	150
Cash Provided by (Used in) Operating Activities, Discontinued Operations		(0.7)	(2.6)
Net Cash Provided by (Used in) Operating Activities		(98)	147.4
Additions to property, plant, equipment and mine development		(30.3)	(32.1)
Changes in accrued expenses related to capital expenditures		(4.4)	(11.1)
Federal coal lease expenditures		0	0
Proceeds from disposal of assets, net of notes receivable		66.3	32
Payments to Acquire Marketable Securities			22.6
Proceeds from Sale and Maturity of Marketable Securities			33.6
Contributions to joint ventures		(241.7)	(349.8)
Distributions from joint ventures		236.7	339.8
Increase (Decrease) in Due to Related Parties		(23.3)	(3.6)
Increase (Decrease) in Due from Related Parties		13.2
Other, net		(3.6)	(0.3)
Net Cash Provided by (Used in) Investing Activities		12.9	(14.1)
Proceeds from long-term debt		7.8	0
Repayments of long-term debt		(4.9)	(6.4)
Payment of deferred financing costs		(4.2)	0
Payments of Ordinary Dividends, Common Stock			0
Distributions to noncontrolling interests		(3.9)	(2.1)
Other, net		0	(4.1)
Transactions With Affiliates Net		318.1	(40.5)
Net Cash Provided by (Used in) Financing Activities		312.9	(53.1)
Cash and Cash Equivalents, Period Increase (Decrease)		227.8	80.2
Cash and Cash Equivalents, at Carrying Value	$ 477.2	$ 477.2	$ 185.9		$ 249.4	$ 105.7

Supplemental Guarantor_Non-Gu85

Supplemental Guarantor/Non-Guarantor Financial Information (Details 4) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2015
Revenues	$ 1,207.1	$ 1,418.9	$ 2,123.9	$ 3,274.5	$ 4,296.1
Operating Costs and Expenses	1,064.8	1,254	1,909.5	2,981.2	3,774.4
Depreciation, Depletion and Amortization	117.8	136	216.8	345.5	430.6
Asset retirement obligation expenses	12.7	12.3	22.4	37.3	40.4
Selling and administrative expenses	32.1	37.8	51.9	114.6	128.8
Restructuring charges	0.3	1.8	2.8	15.5	23
Net gain on disposal of assets	1.9	7.9	15.6	17.4	20.2
Loss from equity affiliates	(2.9)	(5.3)	(2.6)	(12.6)	(12.3)
Interest expense	58.5	118.5	95.5	243.7	344
Interest income	1.3	1.4	2.3	4	6.6
Reorganization Items, net	29.7	0	(125.1)	125.1	0
Income (Loss) from Continuing Operations before Income Taxes	(108.5)	(137.5)	(284.8)	(596.8)	(1,399.2)
Income tax (benefit) provision	(12.9)	6.9	(30.9)	(108.7)	(83.2)
Loss from continuing operations, net of income taxes	(95.6)	(144.4)	(253.9)	(488.1)	(1,316)
Loss from discontinued operations, net of income taxes	(38.1)	(157.5)	(40.5)	(44.5)	(202.7)
Net loss	(133.7)	(301.9)	(294.4)	(532.6)	(1,518.7)
Net Income (Loss) Attributable to Noncontrolling Interest	1.8	2.8	3.5	3.5	7.9
Net Income (Loss) Attributable to Common Stockholder	(135.5)	(304.7)	(297.9)	(536.1)	(1,526.6)
Debtor Subsidiaries [Member]
Revenues	793.1		1,331.3
Operating Costs and Expenses	631.6		1,069.1
Depreciation, Depletion and Amortization	61.9		111.6
Asset retirement obligation expenses	7.3		12.5
Selling and administrative expenses	27.2		46.7
Restructuring charges	0.2		2.2
Net gain on disposal of assets	1.9		12.8
Loss from equity affiliates	(97.8)		(189.6)
Interest expense	55.7		89.5
Interest income	1.2		2.1
Reorganization Items, net	28.8		(121.8)
Income (Loss) from Continuing Operations before Income Taxes	(114.3)		(296.8)
Income tax (benefit) provision	(16)		(38.5)
Loss from continuing operations, net of income taxes	(98.3)		(258.3)
Loss from discontinued operations, net of income taxes	(37.2)		(39.6)
Net loss	(135.5)		(297.9)
Net Income (Loss) Attributable to Noncontrolling Interest	0		0
Net Income (Loss) Attributable to Common Stockholder	(135.5)		(297.9)
Non-Debtor Subsidiaries [Member]
Revenues	415.4		795.2
Operating Costs and Expenses	434.6		843
Depreciation, Depletion and Amortization	55.9		105.2
Asset retirement obligation expenses	5.4		9.9
Selling and administrative expenses	4.9		5.2
Restructuring charges	0.1		0.6
Net gain on disposal of assets	0		2.8
Loss from equity affiliates	(2.3)		(1.2)
Interest expense	6.5		12
Interest income	3.8		6.2
Reorganization Items, net	0.9		(3.3)
Income (Loss) from Continuing Operations before Income Taxes	(91.4)		(176.2)
Income tax (benefit) provision	3.1		7.6
Loss from continuing operations, net of income taxes	(94.5)		(183.8)
Loss from discontinued operations, net of income taxes	(0.9)		(0.9)
Net loss	(95.4)		(184.7)
Net Income (Loss) Attributable to Noncontrolling Interest	1.8		3.5
Net Income (Loss) Attributable to Common Stockholder	(97.2)		(188.2)
Guarantor Subsidiaries [Member]
Revenues	800.7	902.4		2,087.2	2,699.7
Operating Costs and Expenses	598.7	710.6		1,597.3	2,109.8
Depreciation, Depletion and Amortization	55.9	62		157.6	189.2
Asset retirement obligation expenses	5.4	4.2		17.3	13.9
Selling and administrative expenses	23.4	28.6		95.8	95.3
Restructuring charges	0.1	0.8		11.9	11
Net gain on disposal of assets	1.8	6.6		14.5	16.9
Loss from equity affiliates	(0.7)	(1.8)		(2.8)	(4.7)
Interest expense	4.7	4.4		15.1	13.5
Interest income	1.2	0.5		3.2	1.8
Reorganization Items, net	29.7			47.8
Income (Loss) from Continuing Operations before Income Taxes	85.1	97.1		159.3	98.8
Income tax (benefit) provision	(23.7)	1.8		(70.5)	(63)
Loss from continuing operations, net of income taxes	108.8	95.3		229.8	161.8
Loss from discontinued operations, net of income taxes	(0.3)	(0.3)		(1.4)	(2.2)
Net loss	108.5	95		228.4	159.6
Net Income (Loss) Attributable to Noncontrolling Interest	0	(0.2)		0	0.5
Net Income (Loss) Attributable to Common Stockholder	108.5	95.2		228.4	159.1
Non-Guarantor Subsidiaries [Member]
Revenues	497	640.4		1,421.6	1,951.1
Operating Costs and Expenses	509.3	550.5		1,488.5	1,692.4
Depreciation, Depletion and Amortization	61.9	74		187.9	241.4
Asset retirement obligation expenses	7.3	8.1		20	26.5
Selling and administrative expenses	5	2.7		10	9.2
Restructuring charges	0.2	1		3.6	15.9
Net gain on disposal of assets	0.1	1.4		2.9	1
Loss from equity affiliates	(2.2)	(3.5)		(9.8)	(7.6)
Interest expense	6.5	2.4		19.3	7.9
Interest income	8.9	9.5		25.8	30
Reorganization Items, net	0.8			3.2
Income (Loss) from Continuing Operations before Income Taxes	(87.2)	9.1		(309.2)	(737.4)
Income tax (benefit) provision	4.6	0.5		3.6	0.4
Loss from continuing operations, net of income taxes	(91.8)	8.6		(312.8)	(737.8)
Loss from discontinued operations, net of income taxes	(0.9)	(0.1)		(1.9)	(8.8)
Net loss	(92.7)	8.5		(314.7)	(746.6)
Net Income (Loss) Attributable to Noncontrolling Interest	1.8	3		3.5	7.4
Net Income (Loss) Attributable to Common Stockholder	(94.5)	5.5		(318.2)	(754)
Debtor Non-Debtor Eliminations [Member]
Revenues	(1.4)
Operating Costs and Expenses	(1.4)
Loss from equity affiliates	97.2
Interest expense	(3.7)
Interest income	(3.7)
Income (Loss) from Continuing Operations before Income Taxes	97.2
Loss from continuing operations, net of income taxes	97.2
Net loss	97.2
Net Income (Loss) Attributable to Common Stockholder	97.2
Consolidation, Eliminations [Member]
Revenues	(90.6)	(123.9)	(2.6)	(234.3)	(354.7)
Operating Costs and Expenses	(90.6)	(123.9)	(2.6)	(234.3)	(354.7)
Depreciation, Depletion and Amortization	0	0	0	0	0
Asset retirement obligation expenses	0	0	0	0	0
Selling and administrative expenses	0	0	0	0	0
Restructuring charges	0	0	0	0	0
Net gain on disposal of assets	0	0	0	0	0
Loss from equity affiliates	(14)	(100.7)	188.2	89.8	594.9
Interest expense	(8.8)	(8.7)	(6)	(25.2)	(25.7)
Interest income	(8.8)	(8.7)	(6)	(25.2)	(25.7)
Reorganization Items, net	0		0	0
Income (Loss) from Continuing Operations before Income Taxes	(14)	(100.7)	188.2	89.8	594.9
Income tax (benefit) provision	0	0	0	0	0
Loss from continuing operations, net of income taxes	(14)	(100.7)	188.2	89.8	594.9
Loss from discontinued operations, net of income taxes	0	0	0	0	0
Net loss	(14)	(100.7)	188.2	89.8	594.9
Net Income (Loss) Attributable to Noncontrolling Interest	0	0	0	0	0
Net Income (Loss) Attributable to Common Stockholder	$ (14)	$ (100.7)	$ 188.2	$ 89.8	$ 594.9

Supplemental Guarantor_Non-Gu86

Supplemental Guarantor/Non-Guarantor Financial Information (Details 5) - USD ($) $ in Millions	Sep. 30, 2016	Apr. 12, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Cash and Cash Equivalents, at Carrying Value	$ 1,167.8	$ 652.1	$ 261.3	$ 334.3	$ 298
Restricted Cash and Investments, Current	24.2		0
Accounts receivable, net	351.9		228.8
Accounts Receivable, Related Parties, Current	0		0
Inventory, Net	259.6		307.8
Assets From Coal Trading Activities, Net	19.9		23.5
Deferred Tax Assets, Net of Valuation Allowance, Current	53.5		53.5
Other current assets	368.9		447.6
Assets, Current	2,245.8		1,322.5
Property, Plant and Equipment, Net	9,215.5		9,258.5
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	2.3		2.2
Investments and other assets	771.6		363.7
Notes Receivable, Related Parties	0		0
Total assets	12,235.2		10,946.9
Current portion of long-term debt	493.1		5,874.9
Accounts Payable, Related Parties, Current	0		0
Liabilities from coal trading activities, net	19.5		15.6
Accounts Payable and Other Accrued Liabilities, Current	831.8		1,442.5
Accounts Payable and Accrued Liabilities, Current	835.9		1,446.3
Liabilities, Current	1,348.5		7,336.8
Deferred income taxes	107.6		69.1
Notes Payable, Related Parties, Noncurrent	0		0
Other Noncurrent Liability	1,923.6		2,256.2
Total liabilities not subject to compromise	3,379.7		10,028.4
Liabilities subject to compromise	8,331.6		0
Total liabilities	11,711.3		10,028.4
Stockholders' Equity Attributable to Parent	520.7		916.9
Stockholders' Equity Attributable to Noncontrolling Interest	3.2		1.6
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	523.9		918.5
Liabilities and Equity	12,235.2		10,946.9
Debtor Subsidiaries [Member]
Cash and Cash Equivalents, at Carrying Value	702.1	108.5
Restricted Cash and Investments, Current	1.4
Accounts receivable, net	22.5
Accounts Receivable, Related Parties, Current	387.4
Inventory, Net	118.4
Assets From Coal Trading Activities, Net	0.1
Deferred Tax Assets, Net of Valuation Allowance, Current	53.4
Other current assets	130.1
Assets, Current	1,415.4
Property, Plant and Equipment, Net	4,906.1
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	0
Investments and other assets	4,307.9
Notes Receivable, Related Parties	877
Total assets	11,506.4
Current portion of long-term debt	491
Accounts Payable, Related Parties, Current	0
Liabilities from coal trading activities, net	0.1
Accounts Payable and Other Accrued Liabilities, Current	463
Liabilities, Current	954.1
Deferred income taxes	102.7
Notes Payable, Related Parties, Noncurrent	0
Other Noncurrent Liability	1,597.3
Total liabilities not subject to compromise	2,654.1
Liabilities subject to compromise	8,331.6
Total liabilities	10,985.7
Stockholders' Equity Attributable to Parent	520.7
Stockholders' Equity Attributable to Noncontrolling Interest	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	520.7
Liabilities and Equity	11,506.4
Non-Debtor Subsidiaries [Member]
Cash and Cash Equivalents, at Carrying Value	465.7	$ 543.6
Restricted Cash and Investments, Current	22.8
Accounts receivable, net	329.4
Accounts Receivable, Related Parties, Current	0
Inventory, Net	141.2
Assets From Coal Trading Activities, Net	19.8
Deferred Tax Assets, Net of Valuation Allowance, Current	0.1
Other current assets	238.8
Assets, Current	1,217.8
Property, Plant and Equipment, Net	4,309.4
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	2.3
Investments and other assets	471
Notes Receivable, Related Parties	0
Total assets	6,000.5
Current portion of long-term debt	2.1
Accounts Payable, Related Parties, Current	387.4
Liabilities from coal trading activities, net	19.4
Accounts Payable and Other Accrued Liabilities, Current	372.9
Liabilities, Current	781.8
Deferred income taxes	4.9
Notes Payable, Related Parties, Noncurrent	877
Other Noncurrent Liability	326.3
Total liabilities not subject to compromise	1,990
Liabilities subject to compromise	0
Total liabilities	1,990
Stockholders' Equity Attributable to Parent	4,007.3
Stockholders' Equity Attributable to Noncontrolling Interest	3.2
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	4,010.5
Liabilities and Equity	6,000.5
Debtor Non-Debtor Eliminations [Member]
Cash and Cash Equivalents, at Carrying Value	0
Restricted Cash and Investments, Current	0
Accounts receivable, net	0
Accounts Receivable, Related Parties, Current	(387.4)
Inventory, Net	0
Assets From Coal Trading Activities, Net	0
Deferred Tax Assets, Net of Valuation Allowance, Current	0
Other current assets	0
Assets, Current	(387.4)
Property, Plant and Equipment, Net	0
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	0
Investments and other assets	(4,007.3)
Notes Receivable, Related Parties	(877)
Total assets	(5,271.7)
Current portion of long-term debt	0
Accounts Payable, Related Parties, Current	(387.4)
Liabilities from coal trading activities, net	0
Accounts Payable and Other Accrued Liabilities, Current	0
Liabilities, Current	(387.4)
Deferred income taxes	0
Notes Payable, Related Parties, Noncurrent	(877)
Other Noncurrent Liability	0
Total liabilities not subject to compromise	(1,264.4)
Liabilities subject to compromise	0
Total liabilities	(1,264.4)
Stockholders' Equity Attributable to Parent	(4,007.3)
Stockholders' Equity Attributable to Noncontrolling Interest	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(4,007.3)
Liabilities and Equity	(5,271.7)
Noncontrolling Interest [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 3.2		$ 1.6

Supplemental Guarantor_Non-Gu87

Supplemental Guarantor/Non-Guarantor Financial Information (Details 6) - USD ($) $ in Millions	6 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	Apr. 12, 2016	Dec. 31, 2015	Dec. 31, 2014
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	$ 254.9	$ (257.9)	$ (62)
Cash Provided by (Used in) Operating Activities, Discontinued Operations	(18.2)	(18.9)	(28.6)
Net Cash Provided by (Used in) Operating Activities	236.7	(276.8)	(90.6)
Additions to property, plant, equipment and mine development	(36.7)	(56.6)	(76.9)
Changes in accrued expenses related to capital expenditures	(1.5)	(5.5)	(14.5)
Federal Coal Lease Expenditures	(248.5)
Proceeds from disposal of assets, net of notes receivable	132.5	134.7	39.6
Contributions to joint ventures	(140.5)	(241.7)	(349.8)
Distributions from joint ventures	139.7	236.7	339.8
Increase (Decrease) in Due to Related Parties	(22.7)	(23.3)	(3.6)
Increase (Decrease) in Due from Related Parties	11.9	13.2	0
Other, net	(2.9)	(8.2)	(2.1)
Net Cash Provided by (Used in) Investing Activities, Continuing Operations	(168.7)
Proceeds from long-term debt	482.8	1,429.8	975.7
Repayments of long-term debt	(4.1)	(11.2)	(666)
Payment of deferred financing costs	(27)	(29.8)	(28.7)
Distributions to noncontrolling interests	(3.9)	(3.9)	(2.1)
Other, net	(0.1)	(1.9)	(4.3)
Transactions With Affiliates Net	0	0	0
Net Cash Provided by (Used in) Financing Activities	447.7	1,383	273.2
Cash and Cash Equivalents, Period Increase (Decrease)	515.7	906.5	36.3
Cash and Cash Equivalents, at Carrying Value	1,167.8	1,167.8	$ 334.3	$ 652.1	$ 261.3	$ 298
Debtor Subsidiaries [Member]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	376.4
Cash Provided by (Used in) Operating Activities, Discontinued Operations	(5.8)
Net Cash Provided by (Used in) Operating Activities	370.6
Additions to property, plant, equipment and mine development	(26.4)
Changes in accrued expenses related to capital expenditures	(0.4)
Federal Coal Lease Expenditures	(248.5)
Proceeds from disposal of assets, net of notes receivable	66.3
Contributions to joint ventures	0
Distributions from joint ventures	0
Increase (Decrease) in Due to Related Parties	0
Increase (Decrease) in Due from Related Parties	0
Other, net	(1.4)
Net Cash Provided by (Used in) Investing Activities, Continuing Operations	(209.6)
Proceeds from long-term debt	475
Repayments of long-term debt	(1.8)
Payment of deferred financing costs	(25.6)
Distributions to noncontrolling interests	0
Other, net	(0.1)
Transactions With Affiliates Net	(14.9)
Net Cash Provided by (Used in) Financing Activities	432.6
Cash and Cash Equivalents, Period Increase (Decrease)	593.6
Cash and Cash Equivalents, at Carrying Value	702.1	702.1		108.5
Non-Debtor Subsidiaries [Member]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	(121.5)
Cash Provided by (Used in) Operating Activities, Discontinued Operations	(12.4)
Net Cash Provided by (Used in) Operating Activities	(133.9)
Additions to property, plant, equipment and mine development	(10.3)
Changes in accrued expenses related to capital expenditures	(1.9)
Federal Coal Lease Expenditures	0
Proceeds from disposal of assets, net of notes receivable	66.2
Contributions to joint ventures	(140.5)
Distributions from joint ventures	139.7
Increase (Decrease) in Due to Related Parties	(22.7)
Increase (Decrease) in Due from Related Parties	11.9
Other, net	(1.5)
Net Cash Provided by (Used in) Investing Activities, Continuing Operations	40.9
Proceeds from long-term debt	7.8
Repayments of long-term debt	(2.3)
Payment of deferred financing costs	(1.4)
Distributions to noncontrolling interests	(3.9)
Other, net	0
Transactions With Affiliates Net	14.9
Net Cash Provided by (Used in) Financing Activities	15.1
Cash and Cash Equivalents, Period Increase (Decrease)	(77.9)
Cash and Cash Equivalents, at Carrying Value	$ 465.7	$ 465.7		$ 543.6

Supplemental Guarantor_Non-Gu88

Supplemental Guarantor/Non-Guarantor Financial Information Textuals (Details)	9 Months Ended
	Sep. 30, 2016
Percent of ownership of certain U.S. subsidiaries that fully and unconditionally guarantee the Senior Notes	100.00%

Subsequent Event (Details)

Subsequent Event (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2016
Subsequent Event [Line Items]
Asset impairment	$ 0	$ 0	$ 17.2	$ 900.8
Metropolitan mine [Member]
Subsequent Event [Line Items]
Cash consideration for asset held for sale	$ 200		$ 200
Metropolitan mine [Member] | Scenario, Forecast [Member]
Subsequent Event [Line Items]
Asset impairment					$ 180