CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
REVENUES
Gas sales	$ 776.4us-gaap_NaturalGasProductionRevenue	$ 779.0us-gaap_NaturalGasProductionRevenue	$ 667.4us-gaap_NaturalGasProductionRevenue
Oil sales	1,368.5us-gaap_OilAndCondensateRevenue	916.6us-gaap_OilAndCondensateRevenue	532.6us-gaap_OilAndCondensateRevenue
NGL sales	223.3us-gaap_NaturalGasMidstreamRevenue	192.2us-gaap_NaturalGasMidstreamRevenue	184.2us-gaap_NaturalGasMidstreamRevenue
Other revenues	11.1	22.4	27.5
Purchased gas, oil and NGL sales	1,035.0us-gaap_RefiningAndMarketingRevenue	774.9us-gaap_RefiningAndMarketingRevenue	660.0us-gaap_RefiningAndMarketingRevenue
Total Revenues	3,414.3us-gaap_OilAndGasRevenue	2,685.1us-gaap_OilAndGasRevenue	2,071.7us-gaap_OilAndGasRevenue
OPERATING EXPENSES
Purchased gas, oil and NGL expense	1,031.2us-gaap_RefiningAndMarketingCosts	783.5us-gaap_RefiningAndMarketingCosts	670.7us-gaap_RefiningAndMarketingCosts
Lease operating expense	240.1us-gaap_LeaseOperatingExpense	181.3us-gaap_LeaseOperatingExpense	175.8us-gaap_LeaseOperatingExpense
Gas, oil and NGL transportation and other handling costs	277.6	222.0	198.1
Gathering and other expense	6.7	8.4	8.2
General and administrative	204.4us-gaap_GeneralAndAdministrativeExpense	160.4us-gaap_GeneralAndAdministrativeExpense	248.4us-gaap_GeneralAndAdministrativeExpense
Production and property taxes	205.2us-gaap_ProductionTaxExpense	161.3us-gaap_ProductionTaxExpense	98.5us-gaap_ProductionTaxExpense
Depreciation, depletion and amortization	994.7	963.8	850.2
Exploration expenses	9.9us-gaap_ExplorationExpense	11.9us-gaap_ExplorationExpense	11.2us-gaap_ExplorationExpense
Impairment	1,143.2us-gaap_AssetImpairmentCharges	93.0us-gaap_AssetImpairmentCharges	133.0us-gaap_AssetImpairmentCharges
Total Operating Expenses	4,113.0us-gaap_OperatingExpenses	2,585.6us-gaap_OperatingExpenses	2,394.1us-gaap_OperatingExpenses
Net gain (loss) from asset sales	(148.6)	103.5	1.2
OPERATING INCOME (LOSS)	(847.3)us-gaap_OperatingIncomeLoss	203.0us-gaap_OperatingIncomeLoss	(321.2)us-gaap_OperatingIncomeLoss
Realized and unrealized gains (losses) on derivative contracts (Note 7)	363.3	58.9	433.5
Interest and other income	12.8us-gaap_InterestIncomeOperating	15.2us-gaap_InterestIncomeOperating	15.0us-gaap_InterestIncomeOperating
Income from unconsolidated affiliates	0.3	0.2	0.1
Loss from early extinguishment of debt	(2.0)	0	(0.6)
Interest expense	(169.1)us-gaap_InterestExpense	(165.1)us-gaap_InterestExpense	(126.3)us-gaap_InterestExpense
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(642.0)	112.2	0.5
Income tax (provision) benefit	232.5us-gaap_IncomeTaxExpenseBenefit	(60.1)us-gaap_IncomeTaxExpenseBenefit	1.9us-gaap_IncomeTaxExpenseBenefit
NET INCOME FROM CONTINUING OPERATIONS	(409.5)	52.1	2.4
Net income from discontinued operations, net of income tax	1,193.9	107.3	125.9
NET INCOME ATTRIBUTABLE TO QEP	$ 784.4us-gaap_NetIncomeLoss	$ 159.4us-gaap_NetIncomeLoss	$ 128.3us-gaap_NetIncomeLoss
Earnings (Loss) Per Common Share Attributable to QEP
Basic total	$ 4.36us-gaap_EarningsPerShareBasic	$ 0.89us-gaap_EarningsPerShareBasic	$ 0.72us-gaap_EarningsPerShareBasic
Diluted total	$ 4.36us-gaap_EarningsPerShareDiluted	$ 0.89us-gaap_EarningsPerShareDiluted	$ 0.72us-gaap_EarningsPerShareDiluted
Weighted-average common shares outstanding
Used in basic calculation	179.8	179.2	177.8
Used in diluted calculation	179.8	179.5	178.7
Dividends per common share	$ 0.08	$ 0.08	$ 0.08
Continuing Operations [Member]
Earnings (Loss) Per Common Share Attributable to QEP
Basic total	$ (2.28)	$ 0.29	$ 0.01
Diluted total	$ (2.28)	$ 0.29	$ 0.01
Discontinued Operations [Member]
Earnings (Loss) Per Common Share Attributable to QEP
Basic total	$ 6.64	$ 0.60	$ 0.71
Diluted total	$ 6.64	$ 0.60	$ 0.71

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