Litigation Settlement, Other Cost

No definition available.

Name:	btu_LitigationSettlementOtherCost
Namespace Prefix:	btu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Returned deposit related to terminated acquisition

+ References

No definition available.

+ Details

Name:	btu_ReturnedDepositRelatedToTerminatedAcquisition
Namespace Prefix:	btu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Take Or Pay Arrangement Term

+ References

No definition available.

+ Details

Name:	btu_TakeOrPayArrangementTerm
Namespace Prefix:	btu_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	btu_TakeOrPayObligationsDueInOneYear
Namespace Prefix:	btu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

Name:	btu_TakeOrPayObligationsTotal
Namespace Prefix:	btu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(6))
-SubTopic 10
-Topic 220
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

+ Details

Name:	us-gaap_LitigationSettlementExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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

Name:	us-gaap_LongTermPurchaseCommitmentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash outflow associated with other payments to acquire businesses including deposit on pending acquisitions and preacquisition costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-13

+ Details

Name:	us-gaap_OtherPaymentsToAcquireBusinesses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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

+ Details

Name:	us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	srt_LitigationCaseAxis=btu_ArbitrationRelatingToTerminatedAngloAmericanAcquisitionDomain
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_LitigationCaseAxis=btu_MetropolitanMineStormwaterDischargeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=us-gaap_CapitalAdditionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Commitments and Contingencies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
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	113.0
Returned deposit related to terminated acquisition	29.0	$ 0.0	$ 0.0
Deposit associated with terminated acquisition	0.0	$ 75.0	$ 0.0
Arbitration Relating to Terminated Anglo American Acquisition [Domain]
Long-term Purchase Commitment [Line Items]
Returned deposit related to terminated acquisition	29.0
Deposit associated with terminated acquisition	75.0
Metropolitan Mine Stormwater Discharge
Long-term Purchase Commitment [Line Items]
Litigation Settlement, Fee Expense	0.2
Litigation Settlement, Other Cost	0.3
Capital Additions
Long-term Purchase Commitment [Line Items]
Unrecorded unconditional purchase obligation (within next twelve months)	$ 49.8