Acquisitions and Divestitures (Tables)

12 Months Ended

Dec. 31, 2014

Dec. 31, 2012

Business Combinations [Abstract]

Schedule of Purchase Price Allocation [Table Text Block]

	As of December 31, 2014
	(in millions)
Consideration:
Total consideration paid	$	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 [Abstract]

	Year ended December 31,
	2014				2013
	Actual		Pro forma		Actual		Pro forma
	(in millions, except per share data)
Revenues	$	3,414.3	$	3,440.4	$	2,685.1	$	2,858.8
Net income attributable to QEP	$	784.4	$	791.4	$	159.4	$	195.3
Earnings per common share attributable to QEP
Basic	$	4.36	$	4.40	$	0.89	$	1.09
Diluted	$	4.36	$	4.40	$	0.89	$	1.09

	Year ended December 31,
	2012
	Actual		Pro forma
	(in millions, except per share data)
Revenues	$	2,071.7	$	2,207.2
Net income attributable to QEP	$	128.3	$	143.0
Earnings per common share attributable to QEP
Basic	$	0.72	$	0.80
Diluted	$	0.72	$	0.80