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Coal Trading (Details) (Coal Trading [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Trading revenue      
Trading revenue $ 58.4us-gaap_TradingActivityGainsAndLossesNet $ 66.0us-gaap_TradingActivityGainsAndLossesNet $ 151.8us-gaap_TradingActivityGainsAndLossesNet
Coal trading derivative instruments and balance sheet offsetting disclosures:      
Assets from coal trading activities, gross amounts of recognized assets 342.5us-gaap_DerivativeFairValueOfDerivativeAsset 418.8us-gaap_DerivativeFairValueOfDerivativeAsset  
Liabilities from coal trading activities, gross amounts of recognized liabilities (285.0)us-gaap_DerivativeFairValueOfDerivativeLiability (332.7)us-gaap_DerivativeFairValueOfDerivativeLiability  
Assets and (liabilities) from coal trading activities, net amounts recognized before the application of variation margin 57.5us-gaap_DerivativeFairValueOfDerivativeNet 86.1us-gaap_DerivativeFairValueOfDerivativeNet  
Gross amounts of coal trading liabilities offset against associated coal trading assets (248.3)us-gaap_DerivativeAssetFairValueGrossLiability (324.7)us-gaap_DerivativeAssetFairValueGrossLiability  
Gross amounts of coal trading assets offset against associated coal trading liabilities 248.3us-gaap_DerivativeLiabilityFairValueGrossAsset 324.7us-gaap_DerivativeLiabilityFairValueGrossAsset  
Net coal trading assets (liabilities) offset against associated (liabilities) assets 0btu_DerivativeFairValueGrossBasisReclassificationsNet 0btu_DerivativeFairValueGrossBasisReclassificationsNet  
Variation margin held offset against assets from coal trading activities (36.6)us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral (58.0)us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral  
Variation margin posted offset against liabilities from coal trading activities 4.0us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral 1.9us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral  
Net variation margin (held) posted (32.6)us-gaap_DerivativeFairValueAmountOffsetAgainstCollateralNet [1] (56.1)us-gaap_DerivativeFairValueAmountOffsetAgainstCollateralNet [1]  
Assets from coal trading activities, net 57.6us-gaap_DerivativeAssets 36.1us-gaap_DerivativeAssets  
Liabilities from coal trading activities, net (32.7)us-gaap_DerivativeLiabilities (6.1)us-gaap_DerivativeLiabilities  
Net assets (liabilities) from coal trading activities 24.9us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet 30.0us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet  
Commodity futures, swaps and options [Member]      
Trading revenue      
Trading revenue 92.3us-gaap_TradingActivityGainsAndLossesNet
/ us-gaap_PrincipleTransactionRevenueDescriptionOfReportingCategoryAxis
= btu_CommoditySwapsAndOptionsMember
/ us-gaap_TradingActivityByTypeAxis
= btu_CoalTradingMember
183.9us-gaap_TradingActivityGainsAndLossesNet
/ us-gaap_PrincipleTransactionRevenueDescriptionOfReportingCategoryAxis
= btu_CommoditySwapsAndOptionsMember
/ us-gaap_TradingActivityByTypeAxis
= btu_CoalTradingMember
159.9us-gaap_TradingActivityGainsAndLossesNet
/ us-gaap_PrincipleTransactionRevenueDescriptionOfReportingCategoryAxis
= btu_CommoditySwapsAndOptionsMember
/ us-gaap_TradingActivityByTypeAxis
= btu_CoalTradingMember
Physical commodity purchase / sale contracts [Member]      
Trading revenue      
Trading revenue (33.9)us-gaap_TradingActivityGainsAndLossesNet
/ us-gaap_PrincipleTransactionRevenueDescriptionOfReportingCategoryAxis
= btu_PhysicalCommodityPurchaseSaleContractsMember
/ us-gaap_TradingActivityByTypeAxis
= btu_CoalTradingMember
(117.9)us-gaap_TradingActivityGainsAndLossesNet
/ us-gaap_PrincipleTransactionRevenueDescriptionOfReportingCategoryAxis
= btu_PhysicalCommodityPurchaseSaleContractsMember
/ us-gaap_TradingActivityByTypeAxis
= btu_CoalTradingMember
(8.1)us-gaap_TradingActivityGainsAndLossesNet
/ us-gaap_PrincipleTransactionRevenueDescriptionOfReportingCategoryAxis
= btu_PhysicalCommodityPurchaseSaleContractsMember
/ us-gaap_TradingActivityByTypeAxis
= btu_CoalTradingMember
Cash Flow Hedging [Member]      
Coal trading derivative instruments and balance sheet offsetting disclosures:      
Net variation margin (held) posted $ 0us-gaap_DerivativeFairValueAmountOffsetAgainstCollateralNet
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_TradingActivityByTypeAxis
= btu_CoalTradingMember
$ (42.0)us-gaap_DerivativeFairValueAmountOffsetAgainstCollateralNet
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_TradingActivityByTypeAxis
= btu_CoalTradingMember
 
[1] None and $42 million of the net variation margin held at December 31, 2014 and 2013, respectively, related to cash flow hedges.