XML 60 R62.htm IDEA: XBRL DOCUMENT v2.4.1.9
Asset Retirement Obligations (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Document Period End Date Dec. 31, 2014    
Asset retirement obligation, current $ 1.3us-gaap_AssetRetirementObligationCurrent $ 1.8us-gaap_AssetRetirementObligationCurrent  
Asset retirement obligations, noncurrent 193.8us-gaap_AssetRetirementObligationsNoncurrent 163.3us-gaap_AssetRetirementObligationsNoncurrent  
ARO Liability [Roll Forward]      
ARO liability, Beginning Balance 165.1us-gaap_AssetRetirementObligation [1] 155.6us-gaap_AssetRetirementObligation [1]  
Accretion 6.7us-gaap_AssetRetirementObligationAccretionExpense 5.6us-gaap_AssetRetirementObligationAccretionExpense  
Liabilities incurred 17.1us-gaap_AssetRetirementObligationLiabilitiesIncurred [2] 6.9us-gaap_AssetRetirementObligationLiabilitiesIncurred [2]  
Revisions of Estimates 33.6us-gaap_AssetRetirementObligationRevisionOfEstimate 11.8us-gaap_AssetRetirementObligationRevisionOfEstimate  
ARO Liabilities Transferred (24.7)qep_AROLiabilitiesTransferred (11.8)qep_AROLiabilitiesTransferred  
Liabilities settled (2.7)us-gaap_AssetRetirementObligationLiabilitiesSettled (3.0)us-gaap_AssetRetirementObligationLiabilitiesSettled  
ARO liability, Ending Balance 195.1us-gaap_AssetRetirementObligation 165.1us-gaap_AssetRetirementObligation [1]  
Midstream Business Held For Sale [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Asset retirement obligations, noncurrent   28.5us-gaap_AssetRetirementObligationsNoncurrent
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= qep_MidstreamBusinessHeldForSaleMember
37.5us-gaap_AssetRetirementObligationsNoncurrent
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= qep_MidstreamBusinessHeldForSaleMember
Permian Basin Acquisition [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Recognized identifiable assets acquired and liabilities assumed, net 941.8us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= qep_PermianBasinAcquisitionMember
   
Permian Basin Acquisition [Member] | Asset Retirement Obligation Costs [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Recognized identifiable assets acquired and liabilities assumed, net $ (9.7)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= qep_PermianBasinAcquisitionMember
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= us-gaap_AssetRetirementObligationCostsMember
   
[1] Excludes $28.5 million and $37.5 million of ARO as of January 1, 2014 and 2013, respectively, classified as "Noncurrent liabilities of discontinued operations" on the Consolidated Balance Sheets.
[2] Additions include $9.7 million related to the Permian Basin Acquisition (see Note 2 - Acquisitions and Divestitures).