Operations by Line of Business (Tables)

9 Months Ended

Sep. 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						9 Months Ended						12 Months Ended
	September 30,						September 30,						September 30,
	2013			2012			2013			2012			2013			2012
	(in millions)
Revenues from Unaffiliated Customers
Questar Gas	$	89.4		$	82.5		$	647.8		$	578.7		$	928.8		$	876.5
Wexpro	13.2			9.8			32.0			27.1			41.0			35.5
Questar Pipeline	47.0			49.5			142.3			150.1			195.3			198.7
Total	$	149.6		$	141.8		$	822.1		$	755.9		$	1,165.1		$	1,110.7
Revenues from Affiliated Companies
Questar Gas	$	0.2		$	0.5		$	0.6		$	2.3		$	0.8		$	3.4
Wexpro	68.1			69.3			215.2			204.6			284.7			271.8
Questar Pipeline	17.6			18.4			54.8			55.2			74.0			73.8
Total	$	85.9		$	88.2		$	270.6		$	262.1		$	359.5		$	349.0
Operating Income (Loss)
Questar Gas	$	(11.2	)	$	(10.7	)	$	55.3		$	52.6		$	95.6		$	90.1
Wexpro	40.7			41.0			121.9			117.9			162.1			155.3
Questar Pipeline	(52.6		)	32.6			5.7			95.2			34.5			126.2
Corporate and other	3.7			0.7			0.3			1.4			(0.4		)	2.1
Total	$	(19.4	)	$	63.6		$	183.2		$	267.1		$	291.8		$	373.7
Net Income (Loss)
Questar Gas	$	(9.0	)	$	(9.3	)	$	26.8		$	23.3		$	50.6		$	43.5
Wexpro	27.5			26.4			82.2			76.5			109.6			100.1
Questar Pipeline	(37.9		)	17.1			(7.6		)	49.8			7.3			67.0
Corporate and other	0.2			(0.4		)	(8.3		)	(1.4		)	(10.6		)	(0.8		)
Total	$	(19.2	)	$	33.8		$	93.1		$	148.2		$	156.9		$	209.8