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Financial Instruments (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 24, 2013
Guarantee Obligations [Line Items]        
Financial instruments with off balance sheet risk $ 2,483.9us-gaap_GuaranteeObligationsMaximumExposure      
Financial Instruments and Guarantees with Off-Balance-Sheet Risk (Textuals) [Abstract]        
Letters of credit outstanding       94.70us-gaap_LettersOfCreditOutstandingAmount
Amount in bank guarantees, letters of credit and surety bonds related to road maintenance, performance guarantees and other operations 150.0btu_AmountInLettersOfCreditAndSuretyBondsRelatedToCollateralForSuretyCompaniesRoadMaintenancePerformanceGuaranteesAndOtherOperations      
DTA Lease Term 30btu_DtaLeaseTerm      
Letter of credit arrangement for workers compensation 22.7btu_LetterofCreditArrangementforWorkersCompensation      
Collateral for letter of credit related to workers compensation 32.6btu_CollateralforLetterofCreditRelatedtoWorkersCompensation      
Credit support to Patriot 122.2btu_CreditsupporttoPatriot 141.5btu_CreditsupporttoPatriot    
Maximum capacity of the securitization program 275.0btu_MaximumCapacityOfSecuritizationProgram      
Amount available under the securitization program 204.0btu_AmountAvailableUnderSecuritizationProgram      
Total consideration received by Company related to accounts receivable sold under securitization program 4,257.2btu_ConsiderationReceivedByCompanyRelatedToSecuritizationProgram      
Cash up front from sale of receivables 2,775.5btu_CashUpFrontFromSaleOfReceivables      
Additional cash upon collection of underlying receivables 1,272.3btu_AdditionalCashUponCollectionOfUnderlyingReceivables      
Non collected receivables 209.4btu_NonCollectedReceivables      
Reduction in accounts receivable as a result of securitization activity 30.0us-gaap_QualitativeAndQuantitativeInformationAssetOrLiabilityTransferorsContinuingInvolvementSecuritizationOrAssetbackedFinancingPrincipalAmountOutstandingDerecognizedAmount 100.0us-gaap_QualitativeAndQuantitativeInformationAssetOrLiabilityTransferorsContinuingInvolvementSecuritizationOrAssetbackedFinancingPrincipalAmountOutstandingDerecognizedAmount    
Expense associated with securitization transactions 1.5us-gaap_GainLossOnSecuritizationOfFinancialAssets 1.5us-gaap_GainLossOnSecuritizationOfFinancialAssets 2.0us-gaap_GainLossOnSecuritizationOfFinancialAssets  
DTA and PBGC [Member]        
Financial Instruments and Guarantees with Off-Balance-Sheet Risk (Textuals) [Abstract]        
Letters of credit outstanding 79.70us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= btu_DtaAndPbgcMember		      
Dominion Terminal Associates Partnership [Member]        
Financial Instruments and Guarantees with Off-Balance-Sheet Risk (Textuals) [Abstract]        
Ownership percentage of equity method investment 37.50%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= btu_DominionTerminalAssociatesPartnershipMember		      
Number of letters of credit supporting reimbursement obligation 4btu_NumberOfLettersOfCreditSupportingReimbursementObligation
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= btu_DominionTerminalAssociatesPartnershipMember		      
Maximum reimbursement obligation to commercial bank 42.7btu_MaximumReimbursementObligation
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= btu_DominionTerminalAssociatesPartnershipMember		      
Pension Plans Agreement With PBG and TXU Europe [Member]        
Financial Instruments and Guarantees with Off-Balance-Sheet Risk (Textuals) [Abstract]        
Defined benefit pension plans requiring special contributions 2btu_Definedbenefitpensionplansrequiringspecialcontributions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= btu_PensionPlansAgreementWithPbgAndTxuEuropeMember		      
Letter of credit maintained by the Company in favor of the PBGC 37.0btu_LetterOfCreditMaintained
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= btu_PensionPlansAgreementWithPbgAndTxuEuropeMember		      
Guarantee in place from TXU Europe Limited 110.0btu_GuaranteeInPlaceFromAffiliate
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= btu_PensionPlansAgreementWithPbgAndTxuEuropeMember		      
Reclamation Obligations [Member]        
Guarantee Obligations [Line Items]        
Financial instruments with off balance sheet risk 2,024.0us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_UnderlyingAssetClassAxis
= btu_ReclamationObligationsMember		      
Coal Lease Obligations [Member]        
Guarantee Obligations [Line Items]        
Financial instruments with off balance sheet risk 103.8us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_PropertyLeaseGuaranteeMember		      
Workers' Compensation Obligations [Member]        
Guarantee Obligations [Line Items]        
Financial instruments with off balance sheet risk 126.4us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_UnderlyingAssetClassAxis
= btu_WorkersCompensationObligationsMember		      
Other [Member]        
Guarantee Obligations [Line Items]        
Financial instruments with off balance sheet risk 229.7us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_GuaranteeTypeOtherMember		 [1]      
Performance Guarantee [Member]        
Financial Instruments and Guarantees with Off-Balance-Sheet Risk (Textuals) [Abstract]        
Liability for reclamation and bonding guarantee 44.7us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_PerformanceGuaranteeMember		 45.6us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_PerformanceGuaranteeMember		    
Self bonding [Member]        
Guarantee Obligations [Line Items]        
Financial instruments with off balance sheet risk 1,361.4us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= btu_SelfBondingMember		      
Self bonding [Member] | Reclamation Obligations [Member]        
Guarantee Obligations [Line Items]        
Financial instruments with off balance sheet risk 1,361.4us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= btu_SelfBondingMember
/ us-gaap_UnderlyingAssetClassAxis
= btu_ReclamationObligationsMember		      
Self bonding [Member] | Coal Lease Obligations [Member]        
Guarantee Obligations [Line Items]        
Financial instruments with off balance sheet risk 0us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= btu_SelfBondingMember
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_PropertyLeaseGuaranteeMember		      
Self bonding [Member] | Workers' Compensation Obligations [Member]        
Guarantee Obligations [Line Items]        
Financial instruments with off balance sheet risk 0us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= btu_SelfBondingMember
/ us-gaap_UnderlyingAssetClassAxis
= btu_WorkersCompensationObligationsMember		      
Self bonding [Member] | Other [Member]        
Guarantee Obligations [Line Items]        
Financial instruments with off balance sheet risk 0us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= btu_SelfBondingMember
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_GuaranteeTypeOtherMember		 [1]      
Surety Bond [Member]        
Guarantee Obligations [Line Items]        
Financial instruments with off balance sheet risk 532.7us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_SuretyBondMember		      
Financial Instruments and Guarantees with Off-Balance-Sheet Risk (Textuals) [Abstract]        
Credit support to Patriot 81.4btu_CreditsupporttoPatriot
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_SuretyBondMember		      
Surety Bond [Member] | Reclamation Obligations [Member]        
Guarantee Obligations [Line Items]        
Financial instruments with off balance sheet risk 325.2us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_SuretyBondMember
/ us-gaap_UnderlyingAssetClassAxis
= btu_ReclamationObligationsMember		      
Surety Bond [Member] | Coal Lease Obligations [Member]        
Guarantee Obligations [Line Items]        
Financial instruments with off balance sheet risk 103.8us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_SuretyBondMember
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_PropertyLeaseGuaranteeMember		      
Surety Bond [Member] | Workers' Compensation Obligations [Member]        
Guarantee Obligations [Line Items]        
Financial instruments with off balance sheet risk 92.3us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_SuretyBondMember
/ us-gaap_UnderlyingAssetClassAxis
= btu_WorkersCompensationObligationsMember		      
Surety Bond [Member] | Other [Member]        
Guarantee Obligations [Line Items]        
Financial instruments with off balance sheet risk 11.4us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_SuretyBondMember
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_GuaranteeTypeOtherMember		 [1]      
Bank Guarantees [Member]        
Guarantee Obligations [Line Items]        
Financial instruments with off balance sheet risk 437.2us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= btu_BankGuaranteesMember		      
Bank Guarantees [Member] | Reclamation Obligations [Member]        
Guarantee Obligations [Line Items]        
Financial instruments with off balance sheet risk 319.8us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= btu_BankGuaranteesMember
/ us-gaap_UnderlyingAssetClassAxis
= btu_ReclamationObligationsMember		      
Bank Guarantees [Member] | Coal Lease Obligations [Member]        
Guarantee Obligations [Line Items]        
Financial instruments with off balance sheet risk 0us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= btu_BankGuaranteesMember
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_PropertyLeaseGuaranteeMember		      
Bank Guarantees [Member] | Workers' Compensation Obligations [Member]        
Guarantee Obligations [Line Items]        
Financial instruments with off balance sheet risk 0us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= btu_BankGuaranteesMember
/ us-gaap_UnderlyingAssetClassAxis
= btu_WorkersCompensationObligationsMember		      
Bank Guarantees [Member] | Other [Member]        
Guarantee Obligations [Line Items]        
Financial instruments with off balance sheet risk 117.4us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= btu_BankGuaranteesMember
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_GuaranteeTypeOtherMember		 [1]      
Letters of credit [Member]        
Guarantee Obligations [Line Items]        
Financial instruments with off balance sheet risk 152.6us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_StandbyLettersOfCreditMember		      
Financial Instruments and Guarantees with Off-Balance-Sheet Risk (Textuals) [Abstract]        
Credit support to Patriot 22.4btu_CreditsupporttoPatriot
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_StandbyLettersOfCreditMember		      
Letters of credit [Member] | Reclamation Obligations [Member]        
Guarantee Obligations [Line Items]        
Financial instruments with off balance sheet risk 17.6us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_StandbyLettersOfCreditMember
/ us-gaap_UnderlyingAssetClassAxis
= btu_ReclamationObligationsMember		      
Letters of credit [Member] | Coal Lease Obligations [Member]        
Guarantee Obligations [Line Items]        
Financial instruments with off balance sheet risk 0us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_StandbyLettersOfCreditMember
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_PropertyLeaseGuaranteeMember		      
Letters of credit [Member] | Workers' Compensation Obligations [Member]        
Guarantee Obligations [Line Items]        
Financial instruments with off balance sheet risk 34.1us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_StandbyLettersOfCreditMember
/ us-gaap_UnderlyingAssetClassAxis
= btu_WorkersCompensationObligationsMember		      
Letters of credit [Member] | Other [Member]        
Guarantee Obligations [Line Items]        
Financial instruments with off balance sheet risk 100.9us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_StandbyLettersOfCreditMember
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_GuaranteeTypeOtherMember		 [1]      
Corporate Guarantees [Member]        
Financial Instruments and Guarantees with Off-Balance-Sheet Risk (Textuals) [Abstract]        
Credit support to Patriot $ 18.4btu_CreditsupporttoPatriot
/ us-gaap_GuaranteeObligationsByNatureAxis
= btu_CorporateGuaranteesMember		      
[1] Other includes the $79.7 million in letters of credit related to Dominion Terminal Associates and the PBGC, as described below, and an additional $150.0 million in bank guarantees, letters of credit and surety bonds related to road maintenance, performance guarantees and other operations.