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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement of Comprehensive Income [Abstract]      
Net income attributable to QEP $ 784.4us-gaap_NetIncomeLoss $ 159.4us-gaap_NetIncomeLoss $ 128.3us-gaap_NetIncomeLoss
Other comprehensive income, (loss), net of tax:      
Reclassification of previously deferred derivative (gains) losses 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax [1] (77.6)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax [1] (171.1)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax [1]
Pension and other postretirement plans adjustments:      
Current year net actuarial gain (loss) (13.6)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax [2] 13.5us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax [2] (10.0)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax [2]
Amortization of net actuarial loss 0.5us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax [3] 1.5us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax [3] 1.1us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax [3]
Amortization of net prior service cost 9.7us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax [4] 3.3us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax [4] 3.5us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax [4]
Net curtailment and settlements cost incurred 5.6us-gaap_OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax [5] 0us-gaap_OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax [5] 1.4us-gaap_OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax [5]
Total pension and other postretirement plans adjustments 2.2us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 18.3us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax (4.0)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Other comprehensive income (loss) 2.2us-gaap_OtherComprehensiveIncomeLossNetOfTax (59.3)us-gaap_OtherComprehensiveIncomeLossNetOfTax (175.1)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income (loss) attributable to QEP $ 786.6us-gaap_ComprehensiveIncomeNetOfTax $ 100.1us-gaap_ComprehensiveIncomeNetOfTax $ (46.8)us-gaap_ComprehensiveIncomeNetOfTax
[1] Presented net of income tax benefit of $45.9 million and $101.3 million during the years ended December 31, 2013 and 2012, respectively.
[2] Presented net of income tax benefit of $8.5 million for the year ended December 31, 2014, net of income tax expense of $8.3 million during the year ended December 31, 2013 and net of income tax benefit of $6.3 million during the year ended December 31, 2012
[3] Presented net of income tax expense of $0.3 million, $0.9 million and $0.9 million during the years ended December 31, 2014, 2013, and 2012, respectively.
[4] Presented net of income tax expense of $6.0 million, $2.1 million and $2.2 million during the years ended December 31, 2014, 2013 and 2012, respectively.
[5] Presented net of income tax expense of $3.5 million for the year ended December 31, 2014 and $0.8 million during the year ended December 31, 2012.