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Acquisitions & Divestitures (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2015
Dec. 31, 2014
acre
Business Acquisition [Line Items]      
Payments to Acquire Businesses Net     $ 941.8us-gaap_BusinessCombinationConsiderationTransferred1
Net acres of producing and undeveloped oil and gas properties     26,500qep_GasAndOilAcreageAcquiredProducingAndUndeveloped
Number of vertical producing wells     270qep_NumberOfVerticalProducingWells
Escrow Deposit     50.0us-gaap_EscrowDeposit
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual 14.9us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual 29.5us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual  
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual 3.7us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual (1.5)us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual  
Term Loan due 2017 [Member]      
Business Acquisition [Line Items]      
Borrowings to Fund Acquisition     300.0qep_BorrowingstoFundAcquisition
/ us-gaap_LongtermDebtTypeAxis
= qep_TermLoanDue2017Member
Midcontinent Divestitures [Member]      
Business Acquisition [Line Items]      
Gain (Loss) on Disposition of Oil and Gas and Timber Property   (26.8)us-gaap_GainLossOnSaleOfProperty
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= qep_MidcontinentDivestituresMember
(199.4)us-gaap_GainLossOnSaleOfProperty
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= qep_MidcontinentDivestituresMember
Proceeds from Sale of Property, Plant, and Equipment     692.9us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= qep_MidcontinentDivestituresMember
Southern Region Divestitures [Member]      
Business Acquisition [Line Items]      
Gain (Loss) on Disposition of Oil and Gas and Timber Property   (1.8)us-gaap_GainLossOnSaleOfProperty
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= qep_SouthernRegionDivestituresMember
53.3us-gaap_GainLossOnSaleOfProperty
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= qep_SouthernRegionDivestituresMember
Proceeds from Sale of Property, Plant, and Equipment     96.3us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= qep_SouthernRegionDivestituresMember
Permian Basin [Member]      
Business Acquisition [Line Items]      
Payments to Acquire Businesses, Gross     $ 941.8us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= qep_PermianBasinMember