CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
REVENUES
Natural gas sales	$ 779.0	$ 667.4	$ 1,239.1
Oil sales	916.6	532.6	324.2
NGL sales	294.1	322.1	309.8
Gathering, processing and other	189.0	181.6	200.8
Purchased gas, oil and NGL sales	757.1	646.1	1,085.3
Total Revenues	2,935.8	2,349.8	3,159.2
OPERATING EXPENSES
Purchased gas, oil and NGL expense	765.9	655.6	1,077.1
Lease operating expense	177.8	172.3	145.2
Natural gas, oil and NGL transport and other handling costs	141.4	148.9	102.2
Gathering, processing and other	90.6	88.0	107.3
General and administrative	191.1	266.6	123.2
Production and property taxes	166.5	103.4	105.4
Depreciation, depletion and amortization	1,016.0	905.3	765.6
Exploration expenses	11.9	11.2	10.5
Asset Impairment Charges	93.0	133.0	218.2
Total Operating Expenses	2,654.2	2,484.3	2,654.7
Net gain from asset sales	103.0	1.2	1.4
OPERATING INCOME (LOSS)	384.6	(133.3)	505.9
Realized and unrealized gains on derivative contracts (Note 7)	58.9	441.9	0
Interest and other income	5.2	6.6	4.1
Income from unconsolidated affiliates	5.8	6.8	5.5
Loss from early extinguishment of debt	0	(0.6)	(0.7)
Interest expense	(163.3)	(122.9)	(90.0)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	291.2	198.5	424.8
Income taxes	(119.8)	(66.5)	(154.4)
NET INCOME	171.4	132.0	270.4
Net income attributable to noncontrolling interest	(12.0)	(3.7)	(3.2)
NET INCOME ATTRIBUTABLE TO QEP	$ 159.4	$ 128.3	$ 267.2
Earnings Per Common Share Attributable to QEP
Basic total	$ 0.89	$ 0.72	$ 1.51
Diluted total	$ 0.89	$ 0.72	$ 1.50
Weighted-average common shares outstanding
Used in basic calculation	179.2	177.8	176.5
Used in diluted calculation	179.5	178.7	178.4
Dividends per common share	$ 0.08	$ 0.08	$ 0.08