Operations by Line of Business (Tables)

6 Months Ended

Jun. 30, 2012

Segment Reporting [Abstract]

Summary of continuing operations by line of business

Following is a summary of operations by line of business:

	3 Months Ended						6 Months Ended						12 Months Ended
	June 30,						June 30,						June 30,
	2012			2011			2012			2011			2012			2011
	(in millions)
Revenues from Unaffiliated Customers
Questar Gas	$	130.2		$	164.0		$	496.2		$	577.9		$	883.8		$	970.4
Wexpro	8.1			8.4			17.3			16.2			32.6			30.3
Questar Pipeline	50.1			50.5			100.6			98.8			199.2			200.1
Total	$	188.4		$	222.9		$	614.1		$	692.9		$	1,115.6		$	1,200.8
Revenues from Affiliated Companies
Questar Gas	$	1.0		$	1.0		$	1.8		$	1.8		$	3.3		$	2.5
Wexpro	69.6			61.1			135.3			122.0			266.9			241.5
Questar Pipeline	18.3			18.7			36.8			37.3			73.9			74.0
Total	$	88.9		$	80.8		$	173.9		$	161.1		$	344.1		$	318.0
Operating Income
Questar Gas	$	1.5		$	5.7		$	63.3		$	64.5		$	92.9		$	93.4
Wexpro	39.7			36.1			76.9			70.6			152.0			138.2
Questar Pipeline	30.8			31.7			62.6			61.0			127.5			127.0
Corporate and other	0.6			0.2			0.7			0.4			1.5			0.1
Total	$	72.6		$	73.7		$	203.5		$	196.5		$	373.9		$	358.7
Net Income (Loss)
Questar Gas	$	(2.3	)	$	0.4		$	32.6		$	33.8		$	44.9		$	46.8
Wexpro	25.8			23.7			50.1			46.0			99.3			90.9
Questar Pipeline	16.1			16.6			32.7			31.9			68.7			66.2
Corporate and other	(0.4		)	(0.4		)	(1.0		)	(1.5		)	(0.8		)	(2.3		)
Total	$	39.2		$	40.3		$	114.4		$	110.2		$	212.1		$	201.6