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Commitments and Contingencies (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)
Long-term Purchase Commitment [Line Items]
Take-or-pay arrangement term (up to)	19 years
Take-or-pay obligations	$ 1,000.0
Take or pay obligations due in one year	86.0
Capital Additions
Long-term Purchase Commitment [Line Items]
Unrecorded unconditional purchase obligation (within next twelve months)	$ 58.7

X

- Definition

Take Or Pay Arrangement Term

+ References

No definition available.

+ Details

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Namespace Prefix:	btu_
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Balance Type:	na
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X

- Definition

Represents the estimated contractual cash spend in the next twelve months after the balance sheet date related to various short term take or pay arrangements in the U.S. and Australia associated with rail and port commitments for the delivery of coal including amounts relating to export facilities.

+ References

No definition available.

+ Details

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Namespace Prefix:	btu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Represents the total projected cash contractual obligation spend associated with various long and short term take or pay arrangements in the U.S. and Australia for rail and port commitments for the delivery of coal including amounts relating to export facilities.

+ References

No definition available.

+ Details

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Namespace Prefix:	btu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- 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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X

- Definition

Amount of unrecorded obligation to transfer funds in future for fixed or minimum amount or quantity of product and service at fixed or minimum price. Includes, but is not limited to, lease not yet commenced and take-or-pay and throughput contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 440
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482648/440-10-50-4

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-3

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Period Type:	instant

X

- Details

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