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Related Party Transactions	9 Months Ended
Related Party Transactions	Sep. 30, 2018
Related Party Transactions [Abstract]
Related Party Transactions Disclosure	Related Party Transactions On August 14, 2018, Peabody Energy Corporation entered into a share repurchase agreement (the Share Repurchase Agreement) by and among the Company and Elliott Associates, LP, Liverpool Limited Partnership and Sprayberry Investments Inc. to repurchase 7,173,601 shares of the Company’s common stock for an aggregate purchase price of approximately $300 million. Pursuant to the Share Repurchase Agreement, the purchase price per share of $41.82 represented a 1.7% discount from the closing sale price of the common stock on the New York Stock Exchange on August 13, 2018. The repurchase transaction was made in conjunction with the Company’s existing share repurchase program and closed on August 21, 2018.