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Revenues Revenue Recognition (Policies) | 12 Months Ended
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Dec. 31, 2018
Revenue Recognition [Abstract] |
Consideration Received for Beneficial Interest Obtained for Transferring Financial Asset | Also in connection with the adoption of ASC 606, the Company prospectively records a portion of the consideration received as “Interest income” rather than “Revenues” in the accompanying consolidated statements of operations, due to the embedded financing element within the related contract.

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- Definition Recognition of Consideration Received [Policy Text Block] + References No definition available. + Details
Name: | btu_RecognitionofConsiderationReceivedPolicyTextBlock
Namespace Prefix: | btu_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RevenueRecognitionAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration