Operations by Line of Business (Tables)

6 Months Ended

Jun. 30, 2013

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,
	2013			2012			2013			2012			2013			2012
	(in millions)
Revenues from Unaffiliated Customers
Questar Gas	$	140.1		$	130.2		$	558.4		$	496.2		$	921.9		$	883.8
Wexpro	8.5			8.1			18.8			17.3			37.6			32.6
Questar Pipeline	47.0			50.1			95.3			100.6			197.8			199.2
Total	$	195.6		$	188.4		$	672.5		$	614.1		$	1,157.3		$	1,115.6
Revenues from Affiliated Companies
Questar Gas	$	0.1		$	1.0		$	0.4		$	1.8		$	1.1		$	3.3
Wexpro	74.3			69.6			147.1			135.3			285.9			266.9
Questar Pipeline	17.7			18.3			37.2			36.8			74.8			73.9
Total	$	92.1		$	88.9		$	184.7		$	173.9		$	361.8		$	344.1
Operating Income (Loss)
Questar Gas	$	2.2		$	1.5		$	66.5		$	63.3		$	96.1		$	92.9
Wexpro	41.4			39.7			81.2			76.9			162.4			152.0
Questar Pipeline	28.1			30.8			58.3			62.6			119.7			127.5
Corporate and other	(0.5		)	0.6			(3.4		)	0.7			(3.4		)	1.5
Total	$	71.2		$	72.6		$	202.6		$	203.5		$	374.8		$	373.9
Net Income (Loss)
Questar Gas	$	(1.2	)	$	(2.3	)	$	35.8		$	32.6		$	50.3		$	44.9
Wexpro	28.4			25.8			54.7			50.1			108.5			99.3
Questar Pipeline	14.5			16.1			30.3			32.7			62.3			68.7
Corporate and other	(2.3		)	(0.4		)	(8.5		)	(1.0		)	(11.2		)	(0.8		)
Total	$	39.4		$	39.2		$	112.3		$	114.4		$	209.9		$	212.1