CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
REVENUES
Natural gas sales	$ 215.1	$ 218.1	$ 437.6	$ 415.7
Oil sales	358.8	208.3	647.5	402.5
NGL sales	92.9	75.3	194.0	143.7
Gathering, processing and other	34.0	42.6	78.4	88.2
Purchased gas, oil and NGL sales	235.9	206.7	463.1	397.4
Total Revenues	936.7	751.0	1,820.6	1,447.5
OPERATING EXPENSES
Purchased gas, oil and NGL expense	235.7	207.0	460.0	403.8
Lease operating expense	57.5	43.5	112.8	82.4
Natural gas, oil and NGL transportation and other handling costs	54.3	37.3	97.7	71.3
Gathering, processing and other	24.8	23.5	50.6	44.1
General and administrative	64.2	40.9	120.8	86.9
Production and property taxes	56.1	39.3	105.4	75.2
Depreciation, depletion and amortization	249.7	249.8	489.9	504.0
Exploration expenses	1.7	2.6	3.9	7.7
Impairment	1.5	0.2	3.5	0.2
Total Operating Expenses	745.5	644.1	1,444.6	1,275.6
Net (loss) gain from asset sales	(201.0)	100.4	(198.6)	100.2
OPERATING INCOME	(9.8)	207.3	177.4	272.1
Realized and unrealized gains (losses) on derivative contracts (See Note 8)	(88.0)	114.0	(168.9)	79.4
Interest and other income	0.8	3.1	3.7	5.1
Income from unconsolidated affiliates	1.2	1.6	3.4	2.9
Interest expense	(45.7)	(41.4)	(88.2)	(80.8)
INCOME (LOSS) BEFORE INCOME TAXES	(141.5)	284.6	(72.6)	278.7
Income tax (provision) benefit	54.2	(104.8)	30.8	(102.6)
NET INCOME (LOSS)	(87.3)	179.8	(41.8)	176.1
Net income attributable to noncontrolling interest	(5.0)	(1.4)	(10.8)	(2.0)
NET INCOME (LOSS) ATTRIBUTABLE TO QEP	$ (92.3)	$ 178.4	$ (52.6)	$ 174.1
Earnings Per Common Share Attributable to QEP
Earnings Per Share, Basic	$ (0.51)	$ 0.99	$ (0.29)	$ 0.97
Earnings Per Share, Diluted	$ (0.51)	$ 0.99	$ (0.29)	$ 0.97
Weighted-average common shares outstanding
Used in basic calculation (in shares)	180.1	179.3	179.9	179.1
Used in diluted calculation (in shares)	180.1	179.5	179.9	179.4
Dividends per common share (in dollars per share)	$ 0.02	$ 0.02	$ 0.04	$ 0.04