Acquisitions & Divestitures (Tables)

9 Months Ended

Sep. 30, 2014

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

Business Combination, Separately Recognized Transactions [Table Text Block]

	As of September 30, 2014
	(in millions)
Consideration:
Total consideration	$	941.8
Amounts recognized for fair value of assets acquired and liabilities assumed:
Proved properties	$	472.1
Unproved properties	480.6
Asset retirement obligations	(9.7		)
Liabilities assumed	(1.2		)
Total fair value	$	941.8

Business Acquisition, Pro Forma Information [Table Text Block]

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2013		2013		2014		2014		2013		2013
	Actual		Pro forma		Actual		Pro forma		Actual		Pro forma
					(in millions, except per share data)
Revenues	$	719.5	$	776.5	$	2,614.7	$	2,640.8	$	2,064.8	$	2,195.4
Net income (loss) attributable to QEP	37.3		54.2		118.5		125.5		211.4		240.4
Earnings per common share attributable to QEP
Basic	$	0.21	$	0.30	$	0.66	$	0.70	$	1.18	$	1.34
Diluted	0.21		0.30		0.66		0.70		1.18		1.34