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Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Net loss $ (173.3)us-gaap_ProfitLoss $ (44.1)us-gaap_ProfitLoss
Net change in unrealized losses on available-for-sale securities (net of respective net tax benefits of $0.1 and $1.1)    
Net change in unrealized losses on available-for-sale securities (net of respective net tax benefits of $0.1 and $1.1) (0.2)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax (1.8)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Net unrealized (losses) gains on cash flow hedges (net of respective net tax (benefit) provision of ($1.2) and $68.9)    
(Decrease) increase in fair value of cash flow hedges (149.7)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax 116.2us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Reclassification for realized losses included in net loss 94.0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax 5.6us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Net unrealized (losses) gains on cash flow hedges (55.7)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax 121.8us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Postretirement plans and workers' compensation obligations (net of respective net tax benefits of $0.0 and $6.2)    
Prior service cost for the period 0us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit (17.4)us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit
Amortization of actuarial loss and prior service cost included in net loss 12.6btu_OtherComprehensiveIncomeLossReclassificationAndAmortizationPensionAndOtherPostretirementBenefitPlansNetGainLossAndNetPriorServiceCostRecognizedNetOfTax 6.8btu_OtherComprehensiveIncomeLossReclassificationAndAmortizationPensionAndOtherPostretirementBenefitPlansNetGainLossAndNetPriorServiceCostRecognizedNetOfTax
Postretirement plans and workers' compensation obligations 12.6us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax (10.6)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Foreign currency translation adjustment (27.4)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax 16.5us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Other comprehensive (loss) income, net of income taxes (70.7)us-gaap_OtherComprehensiveIncomeLossNetOfTax 125.9us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive (loss) income (244.0)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest 81.8us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Less: Comprehensive income attributable to noncontrolling interests 3.3us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest 4.4us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest
Comprehensive (loss) income attributable to common stockholders $ (247.3)us-gaap_ComprehensiveIncomeNetOfTax $ 77.4us-gaap_ComprehensiveIncomeNetOfTax