CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
REVENUES
Natural gas sales	$ 222.5	$ 197.6
Oil sales	288.7	194.2
NGL sales	101.1	68.4
Gathering, processing and other	44.4	45.6
Purchased gas, oil and NGL sales	227.2	190.7
Total Revenues	883.9	696.5
OPERATING EXPENSES
Purchased gas, oil and NGL expense	224.3	196.8
Lease operating expense	55.3	40.1
Natural gas, oil and NGL transportation and other handling costs	43.4	32.8
Gathering, processing and other	25.8	20.6
General and administrative	56.6	46.0
Production and property taxes	49.3	35.9
Depreciation, depletion and amortization	240.2	254.2
Exploration expenses	2.2	5.1
Impairment	2.0	0
Total Operating Expenses	699.1	631.5
Net (loss) gain from asset sales	2.4	(0.2)
OPERATING INCOME	187.2	64.8
Realized and unrealized losses on derivative contracts (See Note 8)	(80.9)	(34.6)
Interest and other income	2.9	2.0
Income from unconsolidated affiliates	2.2	1.3
Interest expense	(42.5)	(39.4)
(LOSS) INCOME BEFORE INCOME TAXES	68.9	(5.9)
Income tax benefit (provision)	(23.4)	2.2
NET (LOSS) INCOME	45.5	(3.7)
Net income attributable to noncontrolling interest	(5.8)	(0.6)
NET (LOSS) INCOME ATTRIBUTABLE TO QEP	$ 39.7	$ (4.3)
Earnings Per Common Share Attributable to QEP
Earnings Per Share, Basic	$ 0.22	$ (0.02)
Earnings Per Share, Diluted	$ 0.22	$ (0.02)
Weighted-average common shares outstanding
Used in basic calculation (in shares)	179.7	177.0
Used in diluted calculation (in shares)	180.0	177.0
Dividends per common share (in dollars per share)	$ 0.02	$ 0.02