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Summary Quarterly Financial Information (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended 6 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2014
Summary of the unaudited quarterly results of operations                        
Revenues $ 1,684.5us-gaap_Revenues $ 1,722.9us-gaap_Revenues $ 1,758.0us-gaap_Revenues $ 1,626.8us-gaap_Revenues $ 1,742.8us-gaap_Revenues $ 1,797.6us-gaap_Revenues $ 1,725.3us-gaap_Revenues $ 1,748.0us-gaap_Revenues $ 6,792.2us-gaap_Revenues $ 7,013.7us-gaap_Revenues $ 8,077.5us-gaap_Revenues  
Operating profit (loss) (207.0)us-gaap_OperatingIncomeLoss 36.2us-gaap_OperatingIncomeLoss 32.8us-gaap_OperatingIncomeLoss 2.9us-gaap_OperatingIncomeLoss (552.2)us-gaap_OperatingIncomeLoss 112.2us-gaap_OperatingIncomeLoss 26.4us-gaap_OperatingIncomeLoss 88.8us-gaap_OperatingIncomeLoss (135.1)us-gaap_OperatingIncomeLoss (324.8)us-gaap_OperatingIncomeLoss 172.5us-gaap_OperatingIncomeLoss  
Loss from continuing operations, net of income taxes (478.8)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest (154.0)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest (72.0)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest (44.3)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest (401.1)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 24.0us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 101.4us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest (10.3)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest (749.1)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest (286.0)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest (470.9)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest  
Net loss (513.0)us-gaap_ProfitLoss (149.0)us-gaap_ProfitLoss (71.2)us-gaap_ProfitLoss (44.1)us-gaap_ProfitLoss (561.2)us-gaap_ProfitLoss (19.1)us-gaap_ProfitLoss 87.1us-gaap_ProfitLoss (19.4)us-gaap_ProfitLoss (777.3)us-gaap_ProfitLoss (512.6)us-gaap_ProfitLoss (575.1)us-gaap_ProfitLoss  
Net loss attributable to common stockholders (514.6)us-gaap_NetIncomeLoss (150.6)us-gaap_NetIncomeLoss (73.3)us-gaap_NetIncomeLoss (48.5)us-gaap_NetIncomeLoss (565.7)us-gaap_NetIncomeLoss (26.1)us-gaap_NetIncomeLoss 90.3us-gaap_NetIncomeLoss (23.4)us-gaap_NetIncomeLoss (787.0)us-gaap_NetIncomeLoss (524.9)us-gaap_NetIncomeLoss (585.7)us-gaap_NetIncomeLoss  
Basic and diluted EPS — continuing operations(1) $ (1.79)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare [1] $ (0.58)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare [1] $ (0.28)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare [1] $ (0.18)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare [1] $ (1.52)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare [2] $ 0.06us-gaap_IncomeLossFromContinuingOperationsPerBasicShare [2] $ 0.39us-gaap_IncomeLossFromContinuingOperationsPerBasicShare [2] $ (0.05)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare [2] $ (2.83)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ (1.12)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ (1.80)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare  
Diluted EPS — continuing operations(1)         $ (1.52)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare [2] $ 0.06us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare [2] $ 0.39us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare [2] $ (0.05)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare [2] $ (2.83)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ (1.12)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ (1.80)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare  
Weighted average shares used in calculating basic and diluted EPS 268.2us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 268.2us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 268.0us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 267.9us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 267.3us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 267.2us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 266.9us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 266.9us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 268.1us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 267.1us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 268.0us-gaap_WeightedAverageNumberOfSharesOutstandingBasic  
Weighted average shares used in calculating diluted EPS         267.3us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 267.7us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 267.5us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 266.9us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 268.1us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 267.1us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 268.0us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding  
Summary Quarterly Financial Information (Textuals) [Abstract]                        
Additional charge recorded as a result of the damages awarded to Eagle in arbitration   10.6btu_AdditionalchargerecordedasaresultofthedamagesawardedtoEagleinarbitration   15.6btu_AdditionalchargerecordedasaresultofthedamagesawardedtoEagleinarbitration         (15.6)btu_AdditionalchargerecordedasaresultofthedamagesawardedtoEagleinarbitration      
Remeasurement of foreign taxes (1.2)btu_RemeasurementOfForeignTaxes 1.2btu_RemeasurementOfForeignTaxes 1.3btu_RemeasurementOfForeignTaxes 1.4btu_RemeasurementOfForeignTaxes 6.2btu_RemeasurementOfForeignTaxes 2.6btu_RemeasurementOfForeignTaxes 37.1btu_RemeasurementOfForeignTaxes (1.6)btu_RemeasurementOfForeignTaxes 2.7btu_RemeasurementOfForeignTaxes 44.3btu_RemeasurementOfForeignTaxes (7.9)btu_RemeasurementOfForeignTaxes  
Settlement charges related to the Patriot bankruptcy reorganization         30.6btu_SettlementchargesrelatedtothePatriotbankruptcyreorganization       0btu_SettlementchargesrelatedtothePatriotbankruptcyreorganization 30.6btu_SettlementchargesrelatedtothePatriotbankruptcyreorganization 0btu_SettlementchargesrelatedtothePatriotbankruptcyreorganization  
Asset impairment and mine closure costs 154.4us-gaap_RestructuringCostsAndAssetImpairmentCharges       506.8us-gaap_RestructuringCostsAndAssetImpairmentCharges   21.5us-gaap_RestructuringCostsAndAssetImpairmentCharges   154.4us-gaap_RestructuringCostsAndAssetImpairmentCharges 528.3us-gaap_RestructuringCostsAndAssetImpairmentCharges 929.0us-gaap_RestructuringCostsAndAssetImpairmentCharges  
Losses on extinguishment of debt           11.5us-gaap_GainsLossesOnExtinguishmentOfDebt 4.5us-gaap_GainsLossesOnExtinguishmentOfDebt 0.9us-gaap_GainsLossesOnExtinguishmentOfDebt   0us-gaap_GainsLossesOnExtinguishmentOfDebt    
Tax benefit related to the settlement charges related to the Patriot bankruptcy reorganization         11.3btu_TaxbenefitrelatedtothesettlementchargesrelatedtothePatriotbankruptcyreorganization              
Net tax benefit from asset impairment and mine closure costs         112.8btu_NetTaxBenefitFromAsstImpairmentAndMineClosureCosts              
Restructuring and pension settlement charges 26.0btu_Restructuringandpensionsettlementcharges               26.0btu_Restructuringandpensionsettlementcharges 11.9btu_Restructuringandpensionsettlementcharges 0btu_Restructuringandpensionsettlementcharges  
Change in fair value of credit support provided to Patriot 34.1btu_ChangeinfairvalueofcreditsupportprovidedtoPatriot               34.1btu_ChangeinfairvalueofcreditsupportprovidedtoPatriot      
Wilkie Creek [Domain]                        
Summary Quarterly Financial Information (Textuals) [Abstract]                        
Loss related to a discontinued operation         42.5us-gaap_DiscontinuedOperationAmountOfOtherIncomeLossFromDispositionOfDiscontinuedOperationNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= btu_WilkieCreekDomain		 32.4us-gaap_DiscontinuedOperationAmountOfOtherIncomeLossFromDispositionOfDiscontinuedOperationNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= btu_WilkieCreekDomain		            
Air Quality [Member]                        
Summary Quarterly Financial Information (Textuals) [Abstract]                        
Loss related to a discontinued operation                     75.0us-gaap_DiscontinuedOperationAmountOfOtherIncomeLossFromDispositionOfDiscontinuedOperationNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= btu_AirQualityMember		  
Settlement charges related to the Patriot bankruptcy reorganization [Member]                        
Summary Quarterly Financial Information (Textuals) [Abstract]                        
Loss related to a discontinued operation         61.8us-gaap_DiscontinuedOperationAmountOfOtherIncomeLossFromDispositionOfDiscontinuedOperationNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= btu_SettlementchargesrelatedtothePatriotbankruptcyreorganizationMember		         61.8us-gaap_DiscontinuedOperationAmountOfOtherIncomeLossFromDispositionOfDiscontinuedOperationNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= btu_SettlementchargesrelatedtothePatriotbankruptcyreorganizationMember		    
Australia Deferred Tax Assets [Member]                        
Summary Quarterly Financial Information (Textuals) [Abstract]                        
Change in valuation allowance against loss carryforwards 90.4us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_StatementBusinessSegmentsAxis
= btu_AustraliaDeferredTaxAssetsMember		 80.6us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_StatementBusinessSegmentsAxis
= btu_AustraliaDeferredTaxAssetsMember		 75.7us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_StatementBusinessSegmentsAxis
= btu_AustraliaDeferredTaxAssetsMember		 42.6us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_StatementBusinessSegmentsAxis
= btu_AustraliaDeferredTaxAssetsMember		         289.3us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_StatementBusinessSegmentsAxis
= btu_AustraliaDeferredTaxAssetsMember		      
Australian Mining [Member]                        
Summary of the unaudited quarterly results of operations                        
Revenues                 2,671.8us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= btu_AustralianMiningMember		 2,904.6us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= btu_AustralianMiningMember		 3,503.6us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= btu_AustralianMiningMember		  
Summary Quarterly Financial Information (Textuals) [Abstract]                        
Asset impairment and mine closure costs                 78.6us-gaap_RestructuringCostsAndAssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= btu_AustralianMiningMember		 390.8us-gaap_RestructuringCostsAndAssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= btu_AustralianMiningMember		 806.7us-gaap_RestructuringCostsAndAssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= btu_AustralianMiningMember		  
US Deferred Tax Assets [Member]                        
Summary Quarterly Financial Information (Textuals) [Abstract]                        
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability                 280.1us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability
/ us-gaap_StatementBusinessSegmentsAxis
= btu_USDeferredTaxAssetsMember		      
Change in valuation allowance against loss carryforwards 280.1us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_StatementBusinessSegmentsAxis
= btu_USDeferredTaxAssetsMember		               351.2us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_StatementBusinessSegmentsAxis
= btu_USDeferredTaxAssetsMember		      
Gulf Power Company Litigation [Member]                        
Summary Quarterly Financial Information (Textuals) [Abstract]                        
Litigation settlement             20.6us-gaap_LitigationSettlementAmount
/ dei_LegalEntityAxis
= btu_GulfPowerCompanyLitigationMember		          
Prejudgment interest             6.9us-gaap_LitigationSettlementInterest
/ dei_LegalEntityAxis
= btu_GulfPowerCompanyLitigationMember		          
Australian Minerals and Resource Rent Tax [Member]                        
Summary Quarterly Financial Information (Textuals) [Abstract]                        
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability   70.1us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability
/ btu_AustralianMRRTAxis
= btu_AustralianMineralsandResourceRentTaxMember		                   54.0us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability
/ btu_AustralianMRRTAxis
= btu_AustralianMineralsandResourceRentTaxMember
Junior Subordinated Debt [Member]                        
Summary Quarterly Financial Information (Textuals) [Abstract]                        
Refinancing charges classified as interest expense     1.6btu_RefinancingChargesClassifiedAsInterestExpense
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember		           1.6btu_RefinancingChargesClassifiedAsInterestExpense
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember		      
Western U.S. Mining Segment Customer [Member] | Positive Outcome of Litigation [Member]                        
Summary Quarterly Financial Information (Textuals) [Abstract]                        
Contracts Revenue     43.2us-gaap_ContractsRevenue
/ us-gaap_GainContingenciesByNatureAxis
= us-gaap_PositiveOutcomeOfLitigationMember
/ us-gaap_MajorCustomersAxis
= btu_WesternU.S.MiningSegmentCustomerMember		           33.5us-gaap_ContractsRevenue
/ us-gaap_GainContingenciesByNatureAxis
= us-gaap_PositiveOutcomeOfLitigationMember
/ us-gaap_MajorCustomersAxis
= btu_WesternU.S.MiningSegmentCustomerMember		      
Interest In Middlemount Coal Pty Limited [Member]                        
Summary Quarterly Financial Information (Textuals) [Abstract]                        
Change in valuation allowance against loss carryforwards $ (52.3)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= btu_InterestInMiddlemountCoalPtyLimitedMember		                      
[1] EPS for the quarters may not sum to the amounts for the year as each period is computed on a discrete basis.
[2] EPS for the quarters may not sum to the amounts for the year as each period is computed on a discrete basis