Operations by Line of Business (Tables)

9 Months Ended

Sep. 30, 2014

Segment Reporting [Abstract]

Summary of 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,
	2014			2013			2014			2013			2014			2013
	(in millions)
Revenues from Unaffiliated Customers
Questar Gas	$	100.7		$	89.4		$	642.0		$	647.8		$	979.4		$	928.8
Wexpro	9.4			13.2			29.5			32.0			42.6			41.0
Questar Pipeline	47.3			47.0			143.4			142.3			190.6			195.3
Other	0.5			—			1.2			—			1.4			—
Total	$	157.9		$	149.6		$	816.1		$	822.1		$	1,214.0		$	1,165.1
Revenues from Affiliated Companies
Questar Gas	$	—		$	0.2		$	—		$	0.6		$	—		$	0.8
Wexpro	82.3			68.1			266.3			215.2			345.9			284.7
Questar Pipeline	17.7			17.6			54.7			54.8			76.6			74.0
Total	$	100.0		$	85.9		$	321.0		$	270.6		$	422.5		$	359.5
Operating Income (Loss)
Questar Gas	$	(9.4	)	$	(11.2	)	$	60.7		$	55.3		$	107.3		$	95.6
Wexpro	47.2			40.7			141.5			121.9			187.3			162.1
Questar Pipeline	28.8			(52.6		)	89.3			5.7			119.1			34.5
Corporate and other	2.3			3.7			2.2			0.3			2.6			(0.4		)
Total	$	68.9		$	(19.4	)	$	293.7		$	183.2		$	416.3		$	291.8
Net Income (Loss)
Questar Gas	$	(9.1	)	$	(9.0	)	$	27.2		$	26.8		$	53.2		$	50.6
Wexpro	31.1			27.5			93.0			82.2			121.4			109.6
Questar Pipeline	14.9			(37.9		)	46.3			(7.6		)	62.1			7.3
Corporate and other	1.7			0.2			(2.5		)	(8.3		)	(4.6		)	(10.6		)
Total	$	38.6		$	(19.2	)	$	164.0		$	93.1		$	232.1		$	156.9