XML 132 R111.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Current and Long-term Debt Textuals (Details) |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 29, 2017 USD ($) | Sep. 18, 2017 USD ($) | Sep. 15, 2017 USD ($) | Jul. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Apr. 01, 2017 USD ($) | Dec. 31, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Term Loan | Successor Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Fixed Charge Coverage Ratio |  |  |  |  |  |  |  |  |  |  | 2.00 |  |
Loss on early debt extinguishment |  |  |  |  |  |  |  |  |  |  | $ 19,000,000 |  |
Debt Instrument, Restricted Payments Basket |  | $ 450,000,000 |  |  |  |  |  |  |  |  |  |  |
Restricted payments threshold |  | $ 50,000,000.0 |  |  | $ 450,000,000.0 |  |  |  |  |  | 450,000,000.0 |  |
Successor |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance cost |  |  |  |  | 59,400,000 |  |  |  | $ 70,800,000 |  | 59,400,000 | $ 70,800,000 |
Interest Expense |  |  |  |  |  | $ 42,500,000 | $ 41,400,000 |  |  |  | 119,700,000 |  |
Loss on early debt extinguishment |  |  |  |  | 8,000,000 | $ 12,900,000 |  |  |  |  | (20,900,000) |  |
Capital lease obligations |  |  |  |  | $ 76,000,000 |  | 79,900,000 |  | 20,100,000 |  | $ 76,000,000 | 20,100,000 |
Successor | Senior Notes | 6.00% Senior Secured Notes due March 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 6.00% |  |  |  |  |  | 6.00% |  |
Successor | Senior Notes | 6.375% Senior Secured Notes due March 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 6.375% |  |  |  |  |  | 6.375% |  |
Successor | Senior Notes | 6.00% And 6.375% Senior Secured Notes, Successor Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance cost |  |  |  |  | $ 49,500,000 |  |  |  |  |  | $ 49,500,000 |  |
Interest Expense |  |  |  |  |  |  |  |  |  |  | 45,700,000 |  |
Successor | Revolving Credit Facility | 2017 Revolver |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance cost |  |  |  |  | 4,700,000 |  |  |  |  |  | 4,700,000 |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | 350,000,000 |  |  |  |  |  | 350,000,000 |  |
Unrestricted Cash Netting Limit |  |  |  |  |  |  |  |  |  |  | 800,000,000 |  |
Aggregate Letters of Credit, Maximum |  |  |  |  | $ 156,200,000 |  |  |  |  |  | $ 156,200,000 |  |
Successor | Revolving Credit Facility | Letter of credit |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Facility, Base Interest Rate |  |  |  |  | 3.375% |  |  |  |  |  | 3.375% |  |
Successor | Term Loan | Successor Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Expense |  |  |  |  |  |  |  |  |  |  | $ 34,900,000 |  |
Principal amount |  |  |  |  |  |  | 450,000,000 |  |  |  |  |  |
Original issue discount and deferred finance costs |  |  | $ 1,900,000 |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  |  |  |  |  |  |  |  | 5 years |  |
Debt Instrument, Voluntary Principal Prepayment |  |  |  |  | 101.00% |  |  |  |  |  | 101.00% |  |
Mandatory principal prepayment, percent of excess cash flow |  |  |  |  | 75.00% |  |  |  |  |  | 75.00% |  |
Mandatory principal prepayment, if required, period payable, threshold |  |  |  |  |  |  |  |  |  |  | 100 days |  |
Excess proceeds from sales of assets, threshold ($10 million or greater) |  |  |  |  | $ 10,000,000.0 |  |  |  |  |  | $ 10,000,000.0 |  |
Capital expenditure threshold 2018 |  |  |  |  | 220,000,000 |  |  |  |  |  | 220,000,000 |  |
Capital expenditure threshold 2019 |  |  |  |  | 250,000,000 |  |  |  |  |  | 250,000,000 |  |
Capital expenditure threshold 2020 |  |  |  |  | 250,000,000 |  |  |  |  |  | 250,000,000 |  |
Capital expenditure threshold 2021 |  |  |  |  | 300,000,000 |  |  |  |  |  | 300,000,000 |  |
Payment for debt extinguishment or debt prepayment cost | $ 200,000,000 |  | $ 500,000,000 | $ 150,000,000 |  |  |  |  |  |  |  |  |
Debt Instrument, Fee Amount |  |  |  |  | 2,000,000 |  |  |  |  |  | 2,000,000 |  |
Successor | Term Loan | Senior Secured Term Loan due 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Original issue discount and deferred finance costs |  |  |  |  | 6,100,000 |  | $ 37,300,000 |  |  |  | 6,100,000 |  |
Secured Debt |  |  |  |  | $ 950.0 |  |  |  |  |  | $ 950.0 |  |
Predecessor |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, adequate protection payments |  |  |  |  |  |  |  | $ 29,800,000 |  |  |  |  |
Contractual interest expense |  |  |  |  |  |  |  | 92,900,000 |  |  |  |  |
Interest Expense |  |  |  |  |  |  |  | 32,900,000 |  | $ 126,200,000 |  | 298,600,000 | $ 465,400,000
Loss on early debt extinguishment |  |  |  |  |  |  |  | $ 0 | $ 29,500,000 |  |  | $ (29,500,000) | $ (67,800,000)
Debt Instrument, Redemption, Period One | Successor | Senior Notes | 6.00% Senior Secured Notes due March 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage |  |  |  |  |  |  |  |  |  |  | 103.00% |  |
Debt Instrument, Redemption, Period One | Successor | Senior Notes | 6.375% Senior Secured Notes due March 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage |  |  |  |  |  |  |  |  |  |  | 104.80% |  |
Debt Instrument, Redemption, Period Two | Successor | Senior Notes | 6.00% Senior Secured Notes due March 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage |  |  |  |  |  |  |  |  |  |  | 101.50% |  |
Debt Instrument, Redemption, Period Two | Successor | Senior Notes | 6.375% Senior Secured Notes due March 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage |  |  |  |  |  |  |  |  |  |  | 103.20% |  |
Debt Instrument, Redemption, Period Three | Successor | Senior Notes | 6.375% Senior Secured Notes due March 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage |  |  |  |  |  |  |  |  |  |  | 101.60% |  |
Peabody Investments (Gibraltar) Limited | Successor | Senior Notes | 6.00% And 6.375% Senior Secured Notes, Successor Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral, non-voting capital stock, percent |  |  |  |  | 100.00% |  |  |  |  |  | 100.00% |  |
Collateral, voting capital stock, percent |  |  |  |  | 65.00% |  |  |  |  |  | 65.00% |  |
London Interbank Offered Rate (LIBOR) | Successor | Revolving Credit Facility | 2017 Revolver |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  |  | 3.25% |  |
London Interbank Offered Rate (LIBOR) | Successor | Term Loan | Successor Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 3.50% |  |  |  |  | 4.50% |  |  |  | 3.50% |  |
Floor interest rate |  |  |  |  | 1.00% |  | 1.00% |  |  |  | 1.00% |  |
Total Leverage Ratio Less or Equal to 2.00 to 1.00 Greater Than 1.50 to 1.00 | Successor | Term Loan | Successor Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Mandatory principal prepayment, percent of excess cash flow |  |  |  |  | 50.00% |  |  |  |  |  | 50.00% |  |
Total Leverage Ratio Less or Equal to 2.00 to 1.00 Greater Than 1.50 to 1.00 | Successor | Maximum | Term Loan | Successor Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Leverage Ratio |  |  |  |  | 2.00 |  |  |  |  |  | 2.00 |  |
Total Leverage Ratio Less or Equal to 2.00 to 1.00 Greater Than 1.50 to 1.00 | Successor | Minimum | Term Loan | Successor Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Leverage Ratio |  |  |  |  | 1.50 |  |  |  |  |  | 1.50 |  |
Total Leverage Ratio Less or Equal to 1.50 to 1.00 Greater Than 1.00 to 1.00 | Successor | Term Loan | Successor Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Mandatory principal prepayment, percent of excess cash flow |  |  |  |  | 25.00% |  |  |  |  |  | 25.00% |  |
Total Leverage Ratio Less or Equal to 1.50 to 1.00 Greater Than 1.00 to 1.00 | Successor | Maximum | Term Loan | Successor Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Leverage Ratio |  |  |  |  | 1.50 |  |  |  |  |  | 1.50 |  |
Total Leverage Ratio Less or Equal to 1.50 to 1.00 Greater Than 1.00 to 1.00 | Successor | Minimum | Term Loan | Successor Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Leverage Ratio |  |  |  |  | 1.00 |  |  |  |  |  | 1.00 |  |
Total Leverage Ratio Less or Equal to 1.00 to 1.00 | Successor | Term Loan | Successor Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Mandatory principal prepayment, percent of excess cash flow |  |  |  |  | 0.00% |  |  |  |  |  | 0.00% |  |
Total Leverage Ratio |  |  |  |  | 1.00 |  |  |  |  |  | 1.00 |  |
Total Leverage Ration Less Or Equal 2.00 to 1.00 [Member] | Successor | Revolving Credit Facility | 2017 Revolver |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Leverage Ratio |  |  |  |  | 2.00 |  |  |  |  |  | 2.00 |  |
Total Leverage Ratio Less or Equal 1.25 to 1.00 | Term Loan | Successor Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Leverage Ratio |  |  |  |  | 1.25 |  |  |  |  |  | 1.25 |  |
Dividend payment and stock purchase payment threshold |  |  |  |  | $ 25,000,000 |  |  |  |  |  | $ 25,000,000 |  |
Revolving Credit Facility | Successor | Line of Credit | 2017 Revolver |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  | $ 350,000,000 |  |  |  |  |  | $ 350,000,000 |  |
Geographic Distribution, Domestic [Member] | Successor | Senior Notes | 6.00% And 6.375% Senior Secured Notes, Successor Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral, capital stock, percent |  |  |  |  | 100.00% |  |  |  |  |  | 100.00% |  |
Geographic Distribution, Foreign [Member] | Successor | Senior Notes | 6.00% And 6.375% Senior Secured Notes, Successor Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral, non-voting capital stock, percent |  |  |  |  | 100.00% |  |  |  |  |  | 100.00% |  |
Collateral, voting capital stock, percent |  |  |  |  | 65.00% |  |  |  |  |  | 65.00% |  |

X
- Definition Amount represents the maximum face amount of all letters of credit issued under the L/C Facility and the Bonding L/C Facility without DIP Lender consent. + References No definition available. + Details
Name: | btu_AggregateLettersofCreditMaximum
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contractual interest expense + References No definition available. + Details
Name: | btu_Contractualinterestexpense
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Debt Instrument, Base Interest Rate + References No definition available. + Details
Name: | btu_DebtInstrumentBaseInterestRate
Namespace Prefix: | btu_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt Instrument, Capital Expenditure Threshold, Year Five + References No definition available. + Details
Name: | btu_DebtInstrumentCapitalExpenditureThresholdYearFive
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Debt Instrument, Capital Expenditure Threshold, Year Four + References No definition available. + Details
Name: | btu_DebtInstrumentCapitalExpenditureThresholdYearFour
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Debt Instrument, Capital Expenditure Threshold, Year Three + References No definition available. + Details
Name: | btu_DebtInstrumentCapitalExpenditureThresholdYearThree
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Debt Instrument, Capital Expenditure Threshold, Year Two + References No definition available. + Details
Name: | btu_DebtInstrumentCapitalExpenditureThresholdYearTwo
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Debt Instrument, Collateral, Capital Stock, Percent + References No definition available. + Details
Name: | btu_DebtInstrumentCollateralCapitalStockPercent
Namespace Prefix: | btu_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt Instrument, Collateral, Nonvoting Capital Stock, Percent + References No definition available. + Details
Name: | btu_DebtInstrumentCollateralNonvotingCapitalStockPercent
Namespace Prefix: | btu_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt Instrument, Collateral, Voting Capital Stock, Percent + References No definition available. + Details
Name: | btu_DebtInstrumentCollateralVotingCapitalStockPercent
Namespace Prefix: | btu_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt Instrument, Covenant, Dividend Payment And Stock Purchase Payment Threshold + References No definition available. + Details
Name: | btu_DebtInstrumentCovenantDividendPaymentAndStockPurchasePaymentThreshold
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Debt Instrument, Covenant, Excess Proceeds From Sales Of Assets, Threshold + References No definition available. + Details
Name: | btu_DebtInstrumentCovenantExcessProceedsFromSalesOfAssetsThreshold
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Debt Instrument, Covenant, Fixed Charge Coverage Ratio + References No definition available. + Details
Name: | btu_DebtInstrumentCovenantFixedChargeCoverageRatio
Namespace Prefix: | btu_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt Instrument, Covenant, Leverage Ratio + References No definition available. + Details
Name: | btu_DebtInstrumentCovenantLeverageRatio
Namespace Prefix: | btu_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt Instrument, Floor Interest Rate + References No definition available. + Details
Name: | btu_DebtInstrumentFloorInterestRate
Namespace Prefix: | btu_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt Instrument, Mandatory Principal Prepayment, If Required, Period Payable, Threshold + References No definition available. + Details
Name: | btu_DebtInstrumentMandatoryPrincipalPrepaymentIfRequiredPeriodPayableThreshold
Namespace Prefix: | btu_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt Instrument, Mandatory Principal Prepayment, Percent Of Excess Cash Flow + References No definition available. + Details
Name: | btu_DebtInstrumentMandatoryPrincipalPrepaymentPercentOfExcessCashFlow
Namespace Prefix: | btu_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt Instrument, Restricted Payments Basket + References No definition available. + Details
Name: | btu_DebtInstrumentRestrictedPaymentsBasket
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Debt Instrument, Restricted Payments Threshold + References No definition available. + Details
Name: | btu_DebtInstrumentRestrictedPaymentsThreshold
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Debt Instrument, Voluntary Principal Prepayment + References No definition available. + Details
Name: | btu_DebtInstrumentVoluntaryPrincipalPrepayment
Namespace Prefix: | btu_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Interest Expense, Adequate Protection Payments + References No definition available. + Details
Name: | btu_InterestExpenseAdequateProtectionPayments
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Unrestricted Cash Netting Limit + References No definition available. + Details
Name: | btu_UnrestrictedCashNettingLimit
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_CapitalLeaseObligations
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of the fee that accompanies borrowing money under the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentFeeAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
Name: | us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of unamortized debt discount (premium) and debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + Details
Name: | us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DeferredFinanceCostsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + Details
Name: | us-gaap_GainsLossesOnExtinguishmentOfDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
Name: | us-gaap_InterestExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
Name: | us-gaap_PaymentsOfDebtExtinguishmentCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_SecuredDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=btu_TermLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=btu_SuccessorCreditAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_SuccessorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=btu_A6.000SeniorSecuredNotesDue2022Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=btu_A6.375SeniorSecuredNotesDue2025Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=btu_A6.00And6.375PercentSeniorSecuredNotesSuccessorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=btu_A2017RevolverMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=us-gaap_LetterOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=btu_SeniorSecuredTermLoanDue2022Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_PredecessorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=btu_PeabodyInvestmentsGibraltarLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | btu_DebtCovenantTermsAxis=btu_TotalLeverageRatioLessOrEqualTo2.00To1.00GreaterThan1.50To1.00Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | btu_DebtCovenantTermsAxis=btu_TotalLeverageRatioLessOrEqualTo1.50To1.00GreaterThan1.00To1.00Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | btu_DebtCovenantTermsAxis=btu_TotalLeverageRatioLessOrEqualTo1.00To1.00Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | btu_DebtCovenantTermsAxis=btu_TotalLeverageRationLessOrEqual2.00to1.00Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | btu_DebtCovenantTermsAxis=btu_TotalLeverageRatioLessOrEqual1.25to1.00Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GeographicDistributionAxis=us-gaap_GeographicDistributionDomesticMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GeographicDistributionAxis=us-gaap_GeographicDistributionForeignMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |