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Income Taxes Schedule of Deferred Income Tax Assets and Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Components of Deferred Tax Assets and Liabilities [Abstract]    
Deferred Tax Liabilities, Property, Plant and Equipment $ 1,402.9us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment $ 1,455.6us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Deferred Tax Liabilities, Derivatives 127.7us-gaap_DeferredTaxLiabilitiesDerivatives 0us-gaap_DeferredTaxLiabilitiesDerivatives
Deferred Tax Liabilities, Net 1,530.6us-gaap_DeferredIncomeTaxLiabilities 1,455.6us-gaap_DeferredIncomeTaxLiabilities
Deferred Tax Assets, Derivative Instruments 0us-gaap_DeferredTaxAssetsDerivativeInstruments 9.8us-gaap_DeferredTaxAssetsDerivativeInstruments
Deferred Tax Assets Net Operating Loss And Tax Credit Carryforwards 11.7qep_DeferredTaxAssetsNetOperatingLossAndTaxCreditCarryforwards 54.4qep_DeferredTaxAssetsNetOperatingLossAndTaxCreditCarryforwards
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits 43.0us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits 36.1us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Contingencies 0us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsContingencies 0.8us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsContingencies
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Bonuses 16.3us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBonuses 9.0us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBonuses
Deferred Tax Assets, Other 12.4us-gaap_DeferredTaxAssetsOther 8.5us-gaap_DeferredTaxAssetsOther
Deferred Tax Assets, Gross 83.4us-gaap_DeferredTaxAssetsGross 118.6us-gaap_DeferredTaxAssetsGross
Deferred Tax Assets, Net of Valuation Allowance, Classification [Abstract]    
Deferred Tax Assets, Net of Valuation Allowance, Current 0us-gaap_DeferredTaxAssetsNetCurrent 27.9us-gaap_DeferredTaxAssetsNetCurrent
Deferred income taxes 84.5us-gaap_DeferredTaxLiabilitiesCurrent 0us-gaap_DeferredTaxLiabilitiesCurrent
Deferred Tax Liabilities, Net, Noncurrent 1,362.7us-gaap_DeferredTaxLiabilitiesNoncurrent 1,364.9us-gaap_DeferredTaxLiabilitiesNoncurrent
Deferred Tax Liabilities, Net $ 1,447.2us-gaap_DeferredTaxLiabilities $ 1,337.0us-gaap_DeferredTaxLiabilities