Other Events	3 Months Ended
Other Events	Mar. 31, 2020
Other Events [Abstract]
Other Events	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 market 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. Such charges included as “Restructuring charges” in the Company's unaudited condensed consolidated statements of operations for the three months ended March 31, 2020 and 2019 amounted to $6.5 million and $0.2 million, respectively, primarily associated with involuntary workforce reductions. During April 2020, the Company further reduced its workforce by approximately 250 positions, primarily within the Powder River Basin Mining and Other U.S. Thermal Mining operating segments, through the use of involuntary reductions and voluntary programs. The Company will incur additional restructuring charges during the second quarter of 2020, the amount of which will be dependent upon the ultimate participation in ongoing voluntary programs. United Wambo Joint Venture with Glencore In December 2019, after receiving the requisite regulatory and permitting approvals, the Company formed an unincorporated joint venture with Glencore plc (Glencore), in which the Company holds a 50% interest, to combine the existing operations of the Company’s Wambo Open-Cut Mine in Australia with the adjacent coal reserves of Glencore’s United Mine. The Company proportionally consolidates the entity based upon its economic interest. Both parties contributed mining tenements upon formation of the joint venture. Construction and development efforts are currently underway to combine operations. The joint venture agreement specifies that the Company will continue to fully own and operate the existing Wambo Open-Cut Mine through December 1, 2020, at which point the development of the combined operations is expected to be completed, the parties will contribute mining equipment and other assets, and joint operations will commence. Glencore is responsible for construction and development activities and will manage the mining operations of the joint venture. PRB Colorado Joint Venture with Arch On June 18, 2019, the Company entered into a definitive implementation agreement (the Implementation Agreement) with Arch, to establish a joint venture that will combine the respective Powder River Basin (PRB) and Colorado operations of Peabody and Arch. Pursuant to the terms of the Implementation Agreement, Peabody will hold a 66.5% economic interest in the joint venture and Arch will hold a 33.5% economic interest. The Company expects to proportionally consolidate the entity based upon its economic interest. Governance of the joint venture will be overseen by the joint venture’s board of managers, which will be comprised of Peabody and Arch representatives with voting powers proportionate with the companies’ economic interests, with the exception of certain specified matters which will require supermajority approval. Peabody will manage the operations of the joint venture, subject to the supervision of the joint venture’s board of managers. On February 26, 2020, the U.S. Federal Trade Commission (FTC) sought a preliminary injunction to challenge the Company’s proposed joint venture. Peabody and Arch intend to continue to pursue creation of the joint venture and will litigate the FTC’s decision within the U.S. federal court system. Court proceedings are currently scheduled to begin on July 13, 2020, with a ruling expected shortly thereafter, subject to any potential changes to the court’s schedule as a result of the COVID-19 pandemic or other exigent circumstances. The FTC has also initiated an administrative proceeding on the merits, which is currently scheduled for hearing on October 27, 2020. Formation of the joint venture is subject to favorable resolution of the FTC’s challenge noted above and customary closing conditions, including the termination or expiration of the waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, the receipt of certain other required regulatory approvals and the absence of injunctions or other legal restraints preventing the formation of the joint venture. In September 2019, the Company amended its Credit Agreement to expressly permit formation of the joint venture and is currently addressing such formation under the Indenture governing the Senior Notes. At such time as control over the existing operations is exchanged, the Company will account for its interest in the combined operations at fair value, which could result in a significant loss. North Goonyella The Company’s North Goonyella Mine in Queensland, Australia experienced a fire in a portion of the mine during September 2018 and mining operations have been suspended since then. During 2019, the Company completed segmenting of the mine into multiple zones to facilitate a phased re-ventilation and re-entry of the mine, re-ventilation of the first zone of the mine and subsequently re-entered the area. Following these activities and a detailed review and assessment, the Company determined that due to the time, cost and required regulatory approach to ventilate and re-enter the rest of the mine, the Company will not pursue attempts to access certain portions of the mine through existing mine workings, but instead will move to the southern panels. The Company is in ongoing discussions with the Queensland Mines Inspectorate regarding ventilation and re-entry of the second zone of the current mine configuration. Based on the planned approach, the Company expects no meaningful production from North Goonyella for three or more years. In 2020, the Company commenced a commercial process for North Goonyella in conjunction with the existing mine development. The process comes in response to expressions of interest from potential strategic partners and other producers. Commercial outcomes could include a strategic financial partner, a joint venture structure or complete sale of North Goonyella. Subsequent to the first quarter of 2020, the Company entered into commercial agreements to reduce the rail and port commitments related to North Goonyella for the second half of 2020 through the first half of 2023, while maintaining sufficient capacity for future production. During the three months ended March 31, 2020 and 2019, the Company recorded $10.1 million and $36.9 million in containment and idling costs. An additional provision of $24.7 million related to equipment losses was recorded during the three months ended March 31, 2019, which was incremental to amounts recorded in prior periods and represented the best estimate of loss based on the assessments made as of that date. No provision for equipment losses was recorded during the three months ended March 31, 2020. In March 2019, the Company entered into an insurance claim settlement agreement with its insurers and various re-insurers under a combined property damage and business interruption policy and recorded a $125 million insurance recovery, the maximum amount available under the policy above a $50 million deductible. The Company has collected the full amount of the recovery. In the event that no future mining occurs at the North Goonyella Mine or the Company is unable to find a commercial alternative, the Company may record additional charges for the remaining carrying value of the North Goonyella Mine of up to approximately $300 million. Incremental exposures above the aforementioned include take-or-pay obligations and other costs associated with idling or closing the mine. Asset Impairment and Other At-Risk Assets Other than the provision for North Goonyella equipment losses described above, the Company recorded no asset impairment charges during the three months ended March 31, 2020 or 2019. However, the Company has identified certain assets with an aggregate carrying value of approximately $2.1 billion at March 31, 2020 in its Seaborne Metallurgical Mining, Powder River Basin Mining, Other U.S. Thermal Mining and Corporate and Other segments whose recoverability is most sensitive to coal pricing, cost pressures, customer demand and customer concentration risk. The Company conducted a review of those assets for recoverability as of March 31, 2020 and determined that no further impairment charges were necessary as of that date.