Operations by Line of Business

3 Months Ended

Mar. 31, 2013

Segment Reporting [Abstract]

Operations by line of business

Note 9 - Operations by Line of Business

Questar's three principal complementary lines of business include Questar Gas, which provides retail natural gas distribution in Utah, Wyoming and Idaho; Wexpro, which develops and produces natural gas from cost-of-service reserves for Questar Gas customers; and Questar Pipeline, which operates interstate natural gas pipelines and storage facilities. Line-of-business information is presented according to senior management's basis for evaluating performance and considering differences in the nature of products, services and regulation, among other factors. Following is a summary of operations by line of business:

	3 Months Ended						12 Months Ended
	March 31,						March 31,
	2013			2012			2013			2012
	(in millions)
Revenues from Unaffiliated Customers
Questar Gas	$	418.3		$	366.0		$	912.0		$	917.6
Wexpro	10.3			9.2			37.2			32.9
Questar Pipeline	48.3			50.5			200.9			199.6
Total	$	476.9		$	425.7		$	1,150.1		$	1,150.1
Revenues from Affiliated Companies
Questar Gas	$	0.3		$	0.8		$	2.0		$	3.3
Wexpro	72.8			65.7			281.2			258.4
Questar Pipeline	19.5			18.5			75.4			74.3
Total	$	92.6		$	85.0		$	358.6		$	336.0
Operating Income (Loss)
Questar Gas	$	64.3		$	61.8		$	95.4		$	97.1
Wexpro	39.8			37.2			160.7			148.4
Questar Pipeline	30.2			31.8			122.4			128.4
Corporate and other	(2.9		)	0.1			(2.3		)	1.1
Total	$	131.4		$	130.9		$	376.2		$	375.0
Net Income (Loss)
Questar Gas	$	37.0		$	34.9		$	49.2		$	47.6
Wexpro	26.3			24.3			105.9			97.2
Questar Pipeline	15.8			16.6			63.9			69.2
Corporate and other	(6.2		)	(0.6		)	(9.3		)	(0.8		)
Total	$	72.9		$	75.2		$	209.7		$	213.2