XML 78 R66.htm IDEA: XBRL DOCUMENT v2.4.1.9
Accumulated Other Comprehensive Loss (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Accumulated other comprehensive income [Line Items]      
Foreign Currency Translation Adjustment $ (138.9)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax   $ (111.5)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax
Foreign Currency Translation Adjustment, Net change in fair value 0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax    
Foreign Currency Translation Adjustment, Reclassification from other comprehensive income to earnings 0us-gaap_TranslationAdjustmentFunctionalToReportingCurrencyLossGainOnReclassifiedOfEarningsNetOfTax    
Foreign Currency Translation Adjustment, Current period change (27.4)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax 16.5us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax  
Net Actuarial Loss Associated With Postretirement Plans And Workers' Compensation Obligation Net Of Tax (303.4)btu_AccumulatedOtherComprehensiveIncomeLossActurialLossAssociatedWithPostretirementPlansAndWorkersCompensationObligationNetOfTax   (317.5)btu_AccumulatedOtherComprehensiveIncomeLossActurialLossAssociatedWithPostretirementPlansAndWorkersCompensationObligationNetOfTax
Net actuarial loss associated with postretirement plans and workers' compensation obligations, Net change in fair value 0btu_OtherComprehensiveIncomeLossPostretirementPlansAndWorkersCompensationObligationsPeriodIncreaseDecreaseNetOfTax    
Net actuarial loss associated with postretirement plans and workers' compensation obligations, Reclassification from other comprehensive income to earnings 14.1us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax 6.4us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax  
Net actuarial loss associated with postretirement plans and workers' compensation obligations, Current period change 0us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax    
Prior Service Cost Associated with Postretirement Plans 23.6btu_AccumulatedOtherComprehensiveIncomeLossPriorServiceCostCreditArisingDuringPeriodNetOfTax   25.1btu_AccumulatedOtherComprehensiveIncomeLossPriorServiceCostCreditArisingDuringPeriodNetOfTax
Prior service cost associated with postretirement plans, Net change in fair value 0btu_OtherComprehensiveIncomeLossPriorServiceCostAssociatedWithPostretirementPlansPeriodIncreaseDecreaseNetOfTax    
Prior service cost associated with postretirement plans, Reclassification from other comprehensive income to earnings (1.5)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax 0.4us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax  
Prior service cost associated with postretirement plans, Current period change 0us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit (17.4)us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit  
Cash Flow Hedges (416.6)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax   (360.9)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
Cash flow hedges, Net change in fair value (149.7)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax 116.2us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax  
Cash flow hedges, Reclassification from other comprehensive income to earnings 94.0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax 5.6us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax  
Cash flow hedges, Current period change 0btu_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetUnamortizedGainLossArisingDuringPeriodNetOfTax    
Available-For-Sale Securities (0.2)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax   0us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Available-For-Sale Securities, Net change in fair value (0.2)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsNetOfTax    
Available-for-sale securities, Reclassification from other comprehensive income to earnings 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax    
Available-for-sale securities, Current period charge 0btu_OtherComprehensiveIncomeAvailableForSaleSecuritiesNetUnamortizedGainLossArisingDuringPeriodNetOfTax    
Total Accumulated Other Comprehensive (Loss) Income (835.5)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax   (764.8)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total Accumulated Other Comprehensive (Loss) Income, Net change in fair value (149.9)btu_AccumulatedOtherComprehensiveLossNetChangeinFairValueofCashFlowHedgesandAvailableforSaleSecurities    
Total Accumulated Other Comprehensive (Loss) Income, Reclassification from other comprehensive income to earnings 106.6btu_OtherComprehensiveIncomeReclassificationAdjustmentNetOfTax    
Total Accumulated Other Comprehensive (Loss) Income, Current period change (27.4)btu_OtherComprehensiveIncomeLossCurrentPeriodChangeNetOfTax    
Net actuarial loss postretirement health care and life insurance benefits operating costs and expenses [Member]      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]      
Net actuarial loss and prior service cost associated with postretirement plans and workers compensation obligations (6.2)us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= btu_PostretirementHealthCareAndLifeInsuranceBenefitsOperatingCostsAndExpensesActuarialLossMember
(3.6)us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= btu_PostretirementHealthCareAndLifeInsuranceBenefitsOperatingCostsAndExpensesActuarialLossMember
 
Net actuarial loss defined benefit pension plans operating costs and expenses [Member]      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]      
Net actuarial loss and prior service cost associated with postretirement plans and workers compensation obligations (8.3)us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= btu_DefinedBenefitPensionPlansOperatingCostsAndExpensesActuarialLossMember
(6.2)us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= btu_DefinedBenefitPensionPlansOperatingCostsAndExpensesActuarialLossMember
 
Net actuarial loss defined benefit pension plans selling and administrative expenses [Member]      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]      
Net actuarial loss and prior service cost associated with postretirement plans and workers compensation obligations (1.7)us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= btu_DefinedBenefitPensionPlansSellingAndAdministrativeExpensesActuarialLossMember
(1.4)us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= btu_DefinedBenefitPensionPlansSellingAndAdministrativeExpensesActuarialLossMember
 
Net actuarial loss insignificant items [Member]      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]      
Net actuarial loss and prior service cost associated with postretirement plans and workers compensation obligations 2.1us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= btu_InsignificantItemsActuarialLossMember
1.0us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= btu_InsignificantItemsActuarialLossMember
 
Net actuarial loss associated with postretirement plans total before income taxes [Member]      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]      
Net actuarial loss and prior service cost associated with postretirement plans and workers compensation obligations (14.1)us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= btu_NetActuarialLossAssociatedWithPostretirementPlansAndWorkersCompensationObligationsTotalBeforeIncomeTaxesMember
(10.2)us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= btu_NetActuarialLossAssociatedWithPostretirementPlansAndWorkersCompensationObligationsTotalBeforeIncomeTaxesMember
 
Net actuarial (loss) gain associated with postretirement plans and workers compensation obligations income tax benefit [Member]      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]      
Net actuarial loss and prior service cost associated with postretirement plans and workers compensation obligations 0us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= btu_IncomeTaxProvisionActuarialLossMember
3.8us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= btu_IncomeTaxProvisionActuarialLossMember
 
Prior service cost postretirement plans postretirement health care and life insurance benefits operating costs and expenses [Member]      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]      
Net actuarial loss and prior service cost associated with postretirement plans and workers compensation obligations 1.7us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= btu_PostretirementHealthCareAndLifeInsuranceBenefitsOperatingCostsAndExpensesPriorServiceCostMember
(0.3)us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= btu_PostretirementHealthCareAndLifeInsuranceBenefitsOperatingCostsAndExpensesPriorServiceCostMember
 
Prior service cost defined benefit pension plans operating costs and expenses [Member]      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]      
Net actuarial loss and prior service cost associated with postretirement plans and workers compensation obligations (0.2)us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= btu_DefinedbenefitpensionplanspriorservicecostMember
(0.3)us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= btu_DefinedbenefitpensionplanspriorservicecostMember
 
Prior service cost associated with postretirement plans total before income taxes [Member]      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]      
Net actuarial loss and prior service cost associated with postretirement plans and workers compensation obligations 1.5us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= btu_PriorServiceCostAssociatedWithPostretirementPlansAndWorkersCompensationObligationsTotalBeforeIncomeTaxesMember
(0.6)us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= btu_PriorServiceCostAssociatedWithPostretirementPlansAndWorkersCompensationObligationsTotalBeforeIncomeTaxesMember
 
Prior service cost associated with postretirement plans income tax benefit (provision) [Member]      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]      
Net actuarial loss and prior service cost associated with postretirement plans and workers compensation obligations 0us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= btu_IncometaxprovisionpriorservicecostMember
0.2us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= btu_IncometaxprovisionpriorservicecostMember
 
Cash flow hedges foreign currency cash flow hedge contracts operating costs and expenses [Member]      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]      
Cash flow hedges (73.6)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= btu_ForeignCurrencyCashFlowHedgeContractsOperatingCostsAndExpensesMember
(18.8)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= btu_ForeignCurrencyCashFlowHedgeContractsOperatingCostsAndExpensesMember
 
Cash flow hedges fuel and explosives commodity swaps operating costs and expenses [Member]      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]      
Cash flow hedges (30.2)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= btu_CommoditySwapsOperatingCostsAndExpensesMember
(2.4)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= btu_CommoditySwapsOperatingCostsAndExpensesMember
 
Cash flow hedges coal trading commodity futures, swaps and options other revenues [Member]      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]      
Cash flow hedges 13.3us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= btu_CoalTradingOtherRevenuesMember
17.8us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= btu_CoalTradingOtherRevenuesMember
 
Cash flow hedges insignificant items [Member]      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]      
Cash flow hedges (0.2)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= btu_InsignificantItemsCashFlowHedgesMember
(0.1)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= btu_InsignificantItemsCashFlowHedgesMember
 
Cash flow hedges total before income taxes [Member]      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]      
Cash flow hedges (90.7)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= btu_TotalBeforeIncomeTaxesCashFlowHedgesMember
(3.5)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= btu_TotalBeforeIncomeTaxesCashFlowHedgesMember
 
Cash flow hedges income tax benefit (provision) [Member]      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]      
Cash flow hedges $ (3.3)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= btu_IncomeTaxProvisionCashFlowHedgesMember
$ (2.1)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= btu_IncomeTaxProvisionCashFlowHedgesMember