Financial Instruments and Other Guarantees	6 Months Ended
Jun. 30, 2017
Financial Instruments And Guarantees With Off Balance Sheet Risk Disclosure [Abstract]
Financial Instruments and Other Guarantees	Financial Instruments and Other Guarantees In the normal course of business, the Company is a party to guarantees and financial instruments, some of which carry off-balance-sheet risk and are not reflected in the accompanying unaudited condensed consolidated balance sheets. Such financial instruments are valued based on the amount of exposure under the instrument and the likelihood of required performance. Reclamation Bonding The Company is required to provide various forms of financial assurance in support of its mining reclamation obligations in the jurisdictions in which it operates. Such requirements are typically established by statute or under mining permits. Historically, such assurances have taken the form of third-party instruments such as surety bonds, bank guarantees, letters of credit, cash collateral held in restricted accounts, and self-bonding arrangements in the U.S. In connection with its emergence from the Chapter 11 Cases, the Company elected to utilize primarily a portfolio of surety bonds to support its U.S. obligations. At June 30, 2017, the Company's asset retirement obligations for its U.S. operations were $378.6 million and had total corresponding reclamation bonding requirements of $1,147.6 million, which were predominately supported by surety bonds. In limited cases, the Company has also issued of letters of credit in favor of the related surety providers. At June 30, 2017, the Company's asset retirement obligations for its Australia operations of $256.5 million were supported by a combination of bank guarantees and cash collateral. The financial instruments in support of the Company's asset retirement obligations may also be backed by varying levels of restricted cash collateral from time to time, as further described below. Accounts Receivable Securitization As described in Note 3. "Emergence from the Chapter 11 Cases and Fresh Start Reporting," the Company entered into the Receivables Purchase Agreement to extend the receivables securitization facility previously in place and expand that facility to include certain receivables from the Company’s Australian operations. The term of the receivables securitization program (Securitization Program) ends on April 3, 2020, subject to certain liquidity requirements and other customary events of default set forth in the Receivables Purchase Agreement. The Securitization Program provides for up to $250 million in funding accounted for as a secured borrowing, limited to the availability of eligible receivables, and may be secured by a combination of cash collateral and the trade receivables underlying the program, from time to time. Funding capacity under the Securitization Program may also be drawn upon for letters of credit in support of other obligations. Under the terms of the Securitization Program, the Company contributes the trade receivables of its participating subsidiaries on a revolving basis to P&L Receivables, its wholly-owned, bankruptcy-remote subsidiary, which then sells the receivables to unaffiliated asset-backed commercial paper conduits and banks. P&L Receivables retains the ability to repurchase the receivables in certain circumstances. The assets and liabilities of P&L Receivables are consolidated with Peabody, and the Securitization Program is treated as a secured borrowing for accounting purposes, but the assets of P&L Receivables will be used first to satisfy the creditors of P&L Receivables, not Peabody's creditors. The borrowings under the Securitization Program remain outstanding throughout the term of the agreement, subject to the Company maintaining sufficient eligible receivables, by continuing to contribute trade receivables to P&L Receivables, unless an event of default occurs. At June 30, 2017, the Company had no outstanding borrowings and $171.5 million of letters of credit drawn under the Securitization Program. The letters of credit were primarily in support of portions of the Company's obligations for reclamation, workers' compensation and postretirement benefits. The Company had no cash collateral requirement under the Securitization Program at June 30, 2017 and $40.5 million required under its former receivables securitization facility in place prior to the Effective Date at December 31, 2016. The Company incurred fees associated with the Securitization Program of $3.9 million during the Successor period April 2, 2017 through June 30, 2017, which have been recorded as interest expense in the accompanying unaudited statements of operations. As it relates the former receivables securitization facility in place prior to the Effective Date, the Company incurred interest expense of $2.0 million during the Predecessor period January 1, 2017 through April 1, 2017, $2.4 million during the three months ended June 30, 2016 and $3.2 million during the six months ended June 30, 2016. Restricted Cash Collateral The Company has restricted cash held as collateral for financial assurances associated with a variety of long-term obligations and commitments surrounding the mining, reclamation and shipping of its production. At June 30, 2017 and December 31, 2016, the Company had $561.7 million and $529.3 million, respectively, related to such obligations. The Company also had $13.8 million of restricted cash at December 31, 2016 related to various short-term obligations. Other The Company is the lessee under numerous equipment and property leases. It is common in such commercial lease transactions for the Company, as the lessee, to agree to indemnify the lessor for the value of the property or equipment leased, should the property be damaged or lost during the course of the Company’s operations. The Company expects that losses with respect to leased property, if any, would be covered by insurance (subject to deductibles). The Company and certain of its subsidiaries have guaranteed other subsidiaries’ performance under various lease obligations. Aside from indemnification of the lessor for the value of the property leased, the Company’s maximum potential obligations under its leases are equal to the respective future minimum lease payments, and the Company assumes that no amounts could be recovered from third parties. The Company has provided financial guarantees under certain long-term debt agreements entered into by its subsidiaries and substantially all of the Company’s U.S. subsidiaries provide financial guarantees under long-term debt agreements entered into by the Company. The maximum amounts payable under the Company’s debt agreements are equal to the respective principal and interest payments

Financial Instruments and Other Guarantees

In the normal course of business, the Company is a party to guarantees and financial instruments, some of which carry off-balance-sheet risk and are not reflected in the accompanying unaudited condensed consolidated balance sheets. Such financial instruments are valued based on the amount of exposure under the instrument and the likelihood of required performance.

Reclamation Bonding

The Company is required to provide various forms of financial assurance in support of its mining reclamation obligations in the jurisdictions in which it operates. Such requirements are typically established by statute or under mining permits. Historically, such assurances have taken the form of third-party instruments such as surety bonds, bank guarantees, letters of credit, cash collateral held in restricted accounts, and self-bonding arrangements in the U.S. In connection with its emergence from the Chapter 11 Cases, the Company elected to utilize primarily a portfolio of surety bonds to support its U.S. obligations.

At June 30, 2017, the Company's asset retirement obligations for its U.S. operations were $378.6 million and had total corresponding reclamation bonding requirements of $1,147.6 million, which were predominately supported by surety bonds. In limited cases, the Company has also issued of letters of credit in favor of the related surety providers.

At June 30, 2017, the Company's asset retirement obligations for its Australia operations of $256.5 million were supported by a combination of bank guarantees and cash collateral.

The financial instruments in support of the Company's asset retirement obligations may also be backed by varying levels of restricted cash collateral from time to time, as further described below.

Accounts Receivable Securitization

As described in Note 3. "Emergence from the Chapter 11 Cases and Fresh Start Reporting," the Company entered into the Receivables Purchase Agreement to extend the receivables securitization facility previously in place and expand that facility to include certain receivables from the Company’s Australian operations. The term of the receivables securitization program (Securitization Program) ends on April 3, 2020, subject to certain liquidity requirements and other customary events of default set forth in the Receivables Purchase Agreement. The Securitization Program provides for up to $250 million in funding accounted for as a secured borrowing, limited to the availability of eligible receivables, and may be secured by a combination of cash collateral and the trade receivables underlying the program, from time to time. Funding capacity under the Securitization Program may also be drawn upon for letters of credit in support of other obligations.

Under the terms of the Securitization Program, the Company contributes the trade receivables of its participating subsidiaries on a revolving basis to P&L Receivables, its wholly-owned, bankruptcy-remote subsidiary, which then sells the receivables to unaffiliated asset-backed commercial paper conduits and banks. P&L Receivables retains the ability to repurchase the receivables in certain circumstances. The assets and liabilities of P&L Receivables are consolidated with Peabody, and the Securitization Program is treated as a secured borrowing for accounting purposes, but the assets of P&L Receivables will be used first to satisfy the creditors of P&L Receivables, not Peabody's creditors. The borrowings under the Securitization Program remain outstanding throughout the term of the agreement, subject to the Company maintaining sufficient eligible receivables, by continuing to contribute trade receivables to P&L Receivables, unless an event of default occurs.

At June 30, 2017, the Company had no outstanding borrowings and $171.5 million of letters of credit drawn under the Securitization Program. The letters of credit were primarily in support of portions of the Company's obligations for reclamation, workers' compensation and postretirement benefits. The Company had no cash collateral requirement under the Securitization Program at June 30, 2017 and $40.5 million required under its former receivables securitization facility in place prior to the Effective Date at December 31, 2016. The Company incurred fees associated with the Securitization Program of $3.9 million during the Successor period April 2, 2017 through June 30, 2017, which have been recorded as interest expense in the accompanying unaudited statements of operations. As it relates the former receivables securitization facility in place prior to the Effective Date, the Company incurred interest expense of $2.0 million during the Predecessor period January 1, 2017 through April 1, 2017, $2.4 million during the three months ended June 30, 2016 and $3.2 million during the six months ended June 30, 2016.

Restricted Cash Collateral

The Company has restricted cash held as collateral for financial assurances associated with a variety of long-term obligations and commitments surrounding the mining, reclamation and shipping of its production. At June 30, 2017 and December 31, 2016, the Company had $561.7 million and $529.3 million, respectively, related to such obligations. The Company also had $13.8 million of restricted cash at December 31, 2016 related to various short-term obligations.

Other

The Company is the lessee under numerous equipment and property leases. It is common in such commercial lease transactions for the Company, as the lessee, to agree to indemnify the lessor for the value of the property or equipment leased, should the property be damaged or lost during the course of the Company’s operations. The Company expects that losses with respect to leased property, if any, would be covered by insurance (subject to deductibles). The Company and certain of its subsidiaries have guaranteed other subsidiaries’ performance under various lease obligations. Aside from indemnification of the lessor for the value of the property leased, the Company’s maximum potential obligations under its leases are equal to the respective future minimum lease payments, and the Company assumes that no amounts could be recovered from third parties.

The Company has provided financial guarantees under certain long-term debt agreements entered into by its subsidiaries and substantially all of the Company’s U.S. subsidiaries provide financial guarantees under long-term debt agreements entered into by the Company. The maximum amounts payable under the Company’s debt agreements are equal to the respective principal and interest payments