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Long-term Debt Textuals (Details) (USD $)
3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Jun. 30, 2015
Jun. 30, 2015
Mar. 16, 2015
Feb. 05, 2015
Sep. 24, 2013
Debt Instrument [Line Items]              
Payment of deferred financing costs $ 28,400,000us-gaap_PaymentsOfDebtIssuanceCosts $ 0us-gaap_PaymentsOfDebtIssuanceCosts          
Loss on early debt extinguishment 59,500,000us-gaap_GainsLossesOnExtinguishmentOfDebt 0us-gaap_GainsLossesOnExtinguishmentOfDebt          
10.00% Senior Secured Second Lien Notes Due March 2022 [Member]              
Debt Instrument [Line Items]              
Stated interest rate - percentage 10.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= btu_A10.00SeniorSecuredSecondLienNotesDue2022Member
           
Percent of Company Stock Pledged 65.00%btu_PercentofCompanyStockPledged
/ us-gaap_LongtermDebtTypeAxis
= btu_A10.00SeniorSecuredSecondLienNotesDue2022Member
           
Percentage of Equity Interests of Foreign Subsidiaries 65.00%btu_PercentageofEquityInterestsofForeignSubsidiaries
/ us-gaap_LongtermDebtTypeAxis
= btu_A10.00SeniorSecuredSecondLienNotesDue2022Member
           
Debt Instrument, Face Amount         1,000,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= btu_A10.00SeniorSecuredSecondLienNotesDue2022Member
   
Percent of Specified Consolidated Net Tangible Assets 15.00%btu_PercentofSpecifiedConsolidatedNetTangibleAssets
/ us-gaap_LongtermDebtTypeAxis
= btu_A10.00SeniorSecuredSecondLienNotesDue2022Member
           
Value of Specified Consolidated Net Tangible Assets 1,700,000,000btu_ValueofSpecifiedConsNetTangibleAssets
/ us-gaap_LongtermDebtTypeAxis
= btu_A10.00SeniorSecuredSecondLienNotesDue2022Member
           
Principal Property, Book Value 3,000,000,000btu_PrincipalPropertyBV
/ us-gaap_LongtermDebtTypeAxis
= btu_A10.00SeniorSecuredSecondLienNotesDue2022Member
           
Property Not Constituting Principal Property, Book Value 3,000,000,000btu_PropertyNotConstitutingPrincipalPropertyBV
/ us-gaap_LongtermDebtTypeAxis
= btu_A10.00SeniorSecuredSecondLienNotesDue2022Member
           
Amount of Equity Interests of Foreign Subsidiaries and Company Stock Pledged, Book Value 3,500,000,000btu_AmountofEquityInterestsofForeignSubsidiariesandCompanyStockPledgedBV
/ us-gaap_LongtermDebtTypeAxis
= btu_A10.00SeniorSecuredSecondLienNotesDue2022Member
           
Redemption price of bonds as percentage of principal amount plus a make whole premium and any accrued unpaid interest to the redemption date 100.00%btu_RedemptionPriceOfBondsAsPercentageOfPrincipalAmountPlusMakeWholePremiumAndAnyAccruedUnpaidInterestToRedemptionDate
/ us-gaap_LongtermDebtTypeAxis
= btu_A10.00SeniorSecuredSecondLienNotesDue2022Member
           
Redeemable Percent of the Aggregate Principal Amount of the Second Lien Notes 35.00%btu_RedeemablePercentoftheAggregatePrincipalAmountoftheSecondLienNotes
/ us-gaap_LongtermDebtTypeAxis
= btu_A10.00SeniorSecuredSecondLienNotesDue2022Member
           
Debt Instrument Issue Price Percentage 97.566%btu_DebtInstrumentIssuePricePercentage
/ us-gaap_LongtermDebtTypeAxis
= btu_A10.00SeniorSecuredSecondLienNotesDue2022Member
           
Debt Instrument, Unamortized Discount 24,300,000us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= btu_A10.00SeniorSecuredSecondLienNotesDue2022Member
           
Debt Issuance Cost 20,000,000us-gaap_DebtIssuanceCosts
/ us-gaap_LongtermDebtTypeAxis
= btu_A10.00SeniorSecuredSecondLienNotesDue2022Member
           
Payment of deferred financing costs 16,600,000us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_LongtermDebtTypeAxis
= btu_A10.00SeniorSecuredSecondLienNotesDue2022Member
           
7.875% Senior Notes due November 2026 [Member]              
Debt Instrument [Line Items]              
Stated interest rate - percentage 7.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= btu_A7.875SeniorNotesdueNovember2026Member
           
Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Credit agreement borrowing capacity 1,650,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
           
2013 Term Loan Facility due September 2020 [Member]              
Debt Instrument [Line Items]              
Credit agreement borrowing capacity 1,200,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= btu_TermLoanFacilityBMember
           
2013 Credit Facility [Member]              
Debt Instrument [Line Items]              
Percent of Company Stock Pledged             65.00%btu_PercentofCompanyStockPledged
/ us-gaap_LongtermDebtTypeAxis
= btu_A2013CreditFacilityMember
Percentage of Equity Interests of Foreign Subsidiaries           65.00%btu_PercentageofEquityInterestsofForeignSubsidiaries
/ us-gaap_LongtermDebtTypeAxis
= btu_A2013CreditFacilityMember
 
Line Of Credit Facility Annual Dividend Threshold 27,500,000btu_LineOfCreditsFacilityAnnualDividendThreshold
/ us-gaap_LongtermDebtTypeAxis
= btu_A2013CreditFacilityMember
           
Line of Credit Facility General Restricted Payments 100,000,000btu_LineofCreditsFacilityGeneralRestrictedPayments
/ us-gaap_LongtermDebtTypeAxis
= btu_A2013CreditFacilityMember
           
Payments of Debt Restructuring Costs 11,800,000us-gaap_PaymentsOfDebtRestructuringCosts
/ us-gaap_LongtermDebtTypeAxis
= btu_A2013CreditFacilityMember
           
6.00% Senior Notes due November 2018 [Member]              
Debt Instrument [Line Items]              
Stated interest rate - percentage 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= btu_A6.00SeniorNotesdueNovember2018Member
           
6.25% Senior Notes due November 2021 [Member]              
Debt Instrument [Line Items]              
Stated interest rate - percentage 6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= btu_A6.25SeniorNotesdueNovember2021Member
           
6.50% Senior Notes due September 2020 [Member]              
Debt Instrument [Line Items]              
Stated interest rate - percentage 6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= btu_A6.50SeniorNotesdueSeptember2020Member
           
7.375% Senior Notes due November 2016 [Member]              
Debt Instrument [Line Items]              
Stated interest rate - percentage 7.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= btu_A7.375SeniorNotesdueNovember2016Member
           
Debt Instrument, Repurchase Face Amount 650,000,000us-gaap_DebtInstrumentRepurchasedFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= btu_A7.375SeniorNotesdueNovember2016Member
           
Debt Instrument, Repurchased Amount 566,900,000us-gaap_DebtInstrumentRepurchaseAmount
/ us-gaap_LongtermDebtTypeAxis
= btu_A7.375SeniorNotesdueNovember2016Member
           
Loss on early debt extinguishment 59,500,000us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_LongtermDebtTypeAxis
= btu_A7.375SeniorNotesdueNovember2016Member
           
Tender Offer Premiums Paid on the 2016 Senior Notes Repurchase 58,200,000btu_TenderOfferPremiumsPaidon2016SeniorNotesRepurchase
/ us-gaap_LongtermDebtTypeAxis
= btu_A7.375SeniorNotesdueNovember2016Member
           
Write-off of Associated Unamortized Debt Issuance Costs 1,300,000us-gaap_WriteOffOfDeferredDebtIssuanceCost
/ us-gaap_LongtermDebtTypeAxis
= btu_A7.375SeniorNotesdueNovember2016Member
           
Scenario, Forecast [Member] | 7.375% Senior Notes due November 2016 [Member]              
Debt Instrument [Line Items]              
Loss on early debt extinguishment     8,400,000us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_LongtermDebtTypeAxis
= btu_A7.375SeniorNotesdueNovember2016Member
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
       
Write-off of Associated Unamortized Debt Issuance Costs     200,000us-gaap_WriteOffOfDeferredDebtIssuanceCost
/ us-gaap_LongtermDebtTypeAxis
= btu_A7.375SeniorNotesdueNovember2016Member
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
       
Debt Instrument Redemption Amount       83,100,000btu_DebtInstrumentRedemption
/ us-gaap_LongtermDebtTypeAxis
= btu_A7.375SeniorNotesdueNovember2016Member
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
     
Make Whole Premiums Paid on Redemption of 2016 Senior Notes     $ 8,200,000btu_MakeWholePremiumsPaidonRedemptionof2016SeniorNotes
/ us-gaap_LongtermDebtTypeAxis
= btu_A7.375SeniorNotesdueNovember2016Member
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember