Acquisitions & Divestitures (Tables)

3 Months Ended

Mar. 31, 2014

Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]

Business Combination, Separately Recognized Transactions [Table Text Block]

	As of March 31, 2014
	(in millions)
Consideration given:
Cash consideration	$	945.0
Amounts recognized for preliminary fair value of assets acquired and liabilities assumed:
Proved properties	$	516.1
Unproved properties	439.7
Asset retirement obligations	(9.7		)
Liabilities assumed	(1.1		)
Total fair value	$	945.0

Business Acquisition, Pro Forma Information [Table Text Block]

	Three Months Ended				Three Months Ended
	March 31, 2014				March 31, 2013
	Actual		Pro forma		Actual			Pro forma
	(in millions, except per share data)
Revenues	$	883.9	$	910.0	$	696.5		$	731.0
Net income attributable to QEP	39.7		46.7		(4.3		)	3.6
Earnings per common share attributable to QEP
Basic	$	0.22	$	0.26	$	(0.02	)	$	0.02
Diluted	0.22		0.26		(0.02		)	0.02