CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
REVENUES
Gas sales	$ 171.6	$ 194.8	$ 609.2	$ 610.5
Oil sales	393.5	253.8	1,041.0	656.3
NGL sales	51.1	47.7	179.3	144.4
Other revenue	3.4	2.8	5.1	8.7
Purchased gas, oil and NGL sales	290.4	220.4	780.1	644.9
Total Revenues	910.0	719.5	2,614.7	2,064.8
OPERATING EXPENSES
Purchased gas, oil and NGL expense	288.4	219.5	775.5	650.3
Lease operating expense	61.1	43.5	177.0	130.2
Gas, oil and NGL transportation and other handling costs	71.1	58.6	198.5	158.5
Gathering and other expense	1.4	2.1	4.8	6.4
General and administrative	49.4	40.7	147.0	116.8
Production and property taxes	59.4	40.6	160.8	113.7
Depreciation, depletion and amortization	251.4	238.4	712.5	719.3
Exploration expenses	0.8	1.8	4.7	9.5
Impairment	0.1	3.8	3.6	4.0
Total operating expenses	783.1	649.0	2,184.4	1,908.7
Net gain (loss) from asset sales	(11.8)	12.8	(210.3)	113.4
OPERATING INCOME	115.1	83.3	220.0	269.5
Realized and unrealized gains (losses) on derivative contracts (See Note 8)	155.7	(27.8)	(13.2)	51.6
Interest and other income	4.2	6.1	7.8	22.7
Income from unconsolidated affiliates	0.1	0	0.2	0
Interest expense	(41.5)	(41.4)	(128.4)	(124.7)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	233.6	20.2	86.4	219.1
Income tax provision	(79.9)	(8.1)	(26.1)	(82.5)
NET INCOME FROM CONTINUING OPERATIONS	153.7	12.1	60.3	136.6
Discontinued operations, net of income tax	17.4	25.2	58.2	74.8
NET INCOME ATTRIBUTABLE TO QEP	$ 171.1	$ 37.3	$ 118.5	$ 211.4
Earnings Per Common Share Attributable to QEP
Earnings Per Share, Basic	$ 0.95	$ 0.21	$ 0.66	$ 1.18
Earnings Per Share, Diluted	$ 0.94	$ 0.21	$ 0.66	$ 1.18
Weighted-average common shares outstanding
Used in basic calculation (in shares)	180.1	179.3	180.0	179.2
Used in diluted calculation (in shares)	180.6	179.5	180.4	179.4
Dividends per common share (in dollars per share)	$ 0.02	$ 0.02	$ 0.06	$ 0.06
Continuing Operations [Member]
Earnings Per Common Share Attributable to QEP
Earnings Per Share, Basic	$ 0.85	$ 0.07	$ 0.34	$ 0.76
Earnings Per Share, Diluted	$ 0.84	$ 0.07	$ 0.34	$ 0.76
Discontinued Operations [Member]
Earnings Per Common Share Attributable to QEP
Earnings Per Share, Basic	$ 0.10	$ 0.14	$ 0.32	$ 0.42
Earnings Per Share, Diluted	$ 0.10	$ 0.14	$ 0.32	$ 0.42