Operations by Line of Business

3 Months Ended

Mar. 31, 2016

Segment Reporting [Abstract]

Operations by Line of Business

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 and provides other energy services. 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,
	2016			2015			2016			2015
	(in millions)
Revenues from Unaffiliated Customers
Questar Gas	$	407.9		$	374.8		$	950.7		$	939.4
Wexpro	3.5			6.3			20.1			29.6
Questar Pipeline	43.0			46.8			184.1			189.0
Other	1.9			0.7			7.7			3.0
Total	$	456.3		$	428.6		$	1,162.6		$	1,161.0
Revenues from Affiliated Companies
Wexpro	$	79.8		$	84.8		$	314.1		$	346.0
Questar Pipeline	19.3			19.4			75.0			73.8
Total	$	99.1		$	104.2		$	389.1		$	419.8
Operating Income (Loss)
Questar Gas	$	83.4		$	76.6		$	129.4		$	116.3
Wexpro	39.7			41.7			145.4			176.5
Questar Pipeline	27.6			27.4			114.6			114.9
Corporate and other	(15.0		)	1.3			(26.3		)	(3.6		)
Total	$	135.7		$	147.0		$	363.1		$	404.1
Net Income (Loss)
Questar Gas	$	47.6		$	43.8		$	68.1		$	59.4
Wexpro	26.2			27.7			97.4			118.7
Questar Pipeline	14.2			13.9			59.9			58.8
Corporate and other	(9.5		)	(0.8		)	(22.8		)	(10.9		)
Total	$	78.5		$	84.6		$	202.6		$	226.0