CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
REVENUES
Natural gas sales	$ 218.1	$ 138.9	$ 415.7	$ 300.1
Oil sales	208.3	107.2	402.5	218.0
NGL sales	75.3	82.1	143.7	179.5
Gathering, processing and other	42.6	45.8	88.2	95.6
Purchased gas, oil and NGL sales	206.7	125.3	397.4	309.3
Total Revenues	751.0	499.3	1,447.5	1,102.5
OPERATING EXPENSES
Purchased gas, oil and NGL expense	207.0	124.9	403.8	313.3
Lease operating expense	43.5	40.5	82.4	80.6
Natural gas, oil and NGL transportation and other handling costs	37.3	40.7	71.3	75.2
Gathering, processing and other	23.5	20.6	44.1	44.3
General and administrative	40.9	36.8	86.9	72.8
Production and property taxes	39.3	19.4	75.2	44.1
Depreciation, depletion and amortization	249.8	214.4	504.0	413.7
Exploration expenses	2.6	2.1	7.7	4.1
Impairment	0.2	55.4	0.2	61.9
Total Operating Expenses	644.1	554.8	1,275.6	1,110.0
Net (loss) gain from asset sales	100.4	0	100.2	1.5
OPERATING INCOME	207.3	(55.5)	272.1	(6.0)
Realized and unrealized (losses) gains on derivative contracts (See Note 7)	114.0	82.3	79.4	298.6
Interest and other income	3.1	0.9	5.1	2.6
Income from unconsolidated affiliates	1.6	1.4	2.9	3.3
Loss from early extinguishment of debt	0	(0.6)	0	(0.6)
Interest expense	(41.4)	(28.2)	(80.8)	(52.9)
(LOSS) INCOME BEFORE INCOME TAXES	284.6	0.3	278.7	245.0
Income tax benefit (provision)	(104.8)	(0.1)	(102.6)	(88.8)
NET (LOSS) INCOME	179.8	0.2	176.1	156.2
Net income attributable to noncontrolling interest	(1.4)	(0.9)	(2.0)	(1.7)
NET (LOSS) INCOME ATTRIBUTABLE TO QEP	$ 178.4	$ (0.7)	$ 174.1	$ 154.5
Earnings Per Common Share Attributable to QEP
Basic total (in dollars per share)	$ 0.99	$ 0.00	$ 0.97	$ 0.87
Diluted total (in dollars per share)	$ 0.99	$ 0.00	$ 0.97	$ 0.87
Weighted-average common shares outstanding
Used in basic calculation (in shares)	179.3	177.7	179.1	177.6
Used in diluted calculation (in shares)	179.5	177.7	179.4	178.5
Dividends per common share (in dollars per share)	$ 0.02	$ 0.02	$ 0.04	$ 0.04