Operations by Line of Business (Tables)

3 Months Ended

Mar. 31, 2012

Segment Reporting [Abstract]

Summary of continuing operations by line of business

Following is a summary of operations by line of business:

	3 Months Ended						12 Months Ended
	March 31,						March 31,
	2012			2011			2012			2011
	(in millions)
Revenues from Unaffiliated Customers
Questar Gas	$	366.0		$	413.9		$	917.6		$	955.0
Wexpro	9.2			7.8			32.9			26.2
Questar Pipeline	50.5			48.3			199.6			197.8
Total	$	425.7		$	470.0		$	1,150.1		$	1,179.0
Revenues from Affiliated Companies
Questar Gas	$	0.8		$	0.8		$	3.3		$	1.6
Wexpro	65.7			60.9			258.4			240.6
Questar Pipeline	18.5			18.6			74.3			73.8
Total	$	85.0		$	80.3		$	336.0		$	316.0
Operating Income (Loss)
Questar Gas	$	61.8		$	58.8		$	97.1		$	88.8
Wexpro	37.2			34.5			148.4			135.4
Questar Pipeline	31.8			29.3			128.4			126.6
Corporate	0.1			0.2			1.1			(9.5		)
Total	$	130.9		$	122.8		$	375.0		$	341.3
Income (Loss) From Continuing Operations
Questar Gas	$	34.9		$	33.4		$	47.6		$	44.2
Wexpro	24.3			22.3			97.2			89.2
Questar Pipeline	16.6			15.3			69.2			65.5
Corporate	(0.6		)	(1.1		)	(0.8		)	(8.9		)
Total	$	75.2		$	69.9		$	213.2		$	190.0