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Basis of Presentation - Additional Information (Details) - Surety Bond - USD ($) $ in Millions | Jan. 31, 2022 | Nov. 06, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Transaction support agreements, additional collateral to be posted |  | $ 75.0
Transaction support agreements, additional collateral to be posted per year through 2025 | $ 13.0 | $ 25.0

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- Definition Debt Instrument, Transaction Support Agreements, Additional Collateral To Be Posted Per Year Through 2025 + References No definition available. + Details
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Balance Type: | debit
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X
- Definition Debt Instrument, Transaction Support Agreements, One-Time Additional Collateral To Be Posted + References No definition available. + Details
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Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |