Operations by Line of Business

12 Months Ended

Dec. 31, 2012

Segment Reporting [Abstract]

Operations by Line of Business

Note 13 - 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 for Questar Gas customers; and Questar Pipeline, which operates interstate natural gas pipelines and storage facilities. 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. The following is a summary of continuing operations by line of business for the three years ended December 31, 2012:

	Questar Consol.			Interco. Trans.			Questar Gas			Wexpro		Questar Pipeline			Corp and Other
	(in millions)
2012
Revenues
From unaffiliated customers	$	1,098.9		$	—		$	859.7		$	36.1	$	203.1		$	—
From affiliated companies	—			(351.0		)	2.5			274.1		74.4			—
Total Revenues	1,098.9			(351.0		)	862.2			310.2		277.5			—
Operating Expenses
Cost of sales	192.3			(347.7		)	533.3			—		6.7			—
Operating and maintenance	180.8			(0.2		)	119.0			26.8		35.2			—
General and administrative	120.8			(0.6		)	51.2			26.8		50.0			(6.6		)
Retirement incentive	4.9			—			2.4			0.2		0.9			1.4
Production and other taxes	47.9			—			16.2			20.8		9.1			1.8
Depreciation, depletion and amortization	181.6			—			47.2			77.4		54.3			2.7
Other operating expenses	—			(2.5		)	—			2.5		—			—
Total Operating Expenses	728.3			(351.0		)	769.3			154.5		156.2			(0.7		)
Net gain from asset sales	5.1			—			—			2.4		2.7			—
Operating Income	375.7			—			92.9			158.1		124.0			0.7
Interest and other income (expense)	7.0			(0.7		)	5.5			2.8		0.6			(1.2		)
Income from unconsolidated affiliate	3.7			—			—			—		3.7			—
Interest expense	(57.9		)	0.7			(24.1		)	—		(26.3		)	(8.2		)

Income taxes	(116.5		)	—			(27.2		)	(57.0		)	(37.3		)	5.0
Income (Loss) From Continuing Operations	$	212.0		$	—		$	47.1		$	103.9		$	64.7		$	(3.7	)
Identifiable assets of continuing operations	$	3,757.1		$	—		$	1,547.3		$	836.1		$	1,298.9		$	74.8
Goodwill	9.8			—			5.6			—			4.2			—
Investment in unconsolidated affiliate	26.5			—			—			—			26.5			—
Cash capital expenditures	370.7			—			162.1			144.5			60.6			3.5
Accrued capital expenditures	366.3			—			161.2			145.5			58.6			1.0
2011
Revenues
From unaffiliated customers	$	1,194.4		$	—		$	965.5		$	31.5		$	197.4		$	—
From affiliated companies	—			(331.3		)	3.3			253.6			74.4			—
Total Revenues	1,194.4			(331.3		)	968.8			285.1			271.8			—
Operating Expenses
Cost of sales	321.5			(327.3		)	645.7			—			3.1			—
Operating and maintenance	175.9			(0.2		)	118.5			22.3			35.3			—
General and administrative	117.9			(0.5		)	51.0			24.2			46.5			(3.3		)
Production and other taxes	52.5			—			15.0			25.6			10.1			1.8
Depreciation, depletion and amortization	159.9			—			44.5			63.9			51.2			0.3
Other operating expenses	—			(3.3		)	—			3.3			—			—
Total Operating Expenses	827.7			(331.3		)	874.7			139.3			146.2			(1.2		)
Net gain (loss) from asset sales	0.2			—			—			(0.1		)	0.3			—
Operating Income	366.9			—			94.1			145.7			125.9			1.2
Interest and other income	10.4			(0.6		)	5.4			4.2			0.9			0.5
Income from unconsolidated affiliate	3.8			—			—			—			3.8			—
Interest expense	(56.8		)	0.6			(25.9		)	—			(24.5		)	(7.0		)
Income taxes	(116.4		)	—			(27.5		)	(54.7		)	(38.2		)	4.0
Income (Loss) From Continuing Operations	$	207.9		$	—		$	46.1		$	95.2		$	67.9		$	(1.3	)
Identifiable assets of continuing operations	$	3,532.8		$	—		$	1,444.4		$	768.2		$	1,286.6		$	33.6
Goodwill	9.8			—			5.6			—			4.2			—
Investment in unconsolidated affiliate	27.3			—			—			—			27.3			—
Cash capital expenditures	367.7			—			121.5			136.2			104.5			5.5
Accrued capital expenditures	373.9			—			127.7			144.3			93.8			8.1
2010
Revenues
From unaffiliated customers	$	1,123.6		$	—		$	901.8		$	24.6		$	197.2		$	—
From affiliated companies	—			(315.3		)	1.1			240.2			74.0			—
Total Revenues	1,123.6			(315.3		)	902.9			264.8			271.2			—
Operating Expenses
Cost of sales	280.9			(313.7		)	592.2			—			2.4			—
Operating and maintenance	175.8			(0.2		)	114.4			20.2			41.4			—
General and administrative	108.5			(0.3		)	49.9			20.5			41.0			(2.6		)
Separation costs	11.5			—			—			—			—			11.5
Production and other taxes	50.6			—			14.1			26.8			9.0			0.7
Depreciation, depletion and amortization	153.4			—			43.7			62.1			47.4			0.2

Other operating expenses	—			(1.1		)	—			1.1			—			—
Total Operating Expenses	780.7			(315.3		)	814.3			130.7			141.2			9.8
Net gain (loss) from asset sales	0.4			—			—			(0.4		)	0.8			—
Operating Income (Loss)	343.3			—			88.6			133.7			130.8			(9.8		)
Interest and other income	11.7			(0.8		)	6.7			3.2			0.4			2.2
Income from unconsolidated affiliate	3.8			—			—			—			3.8			—
Interest expense	(57.1		)	0.8			(26.2		)	(0.3		)	(28.8		)	(2.6		)
Income taxes	(109.4		)	—			(25.2		)	(48.5		)	(38.8		)	3.1
Income (Loss) From Continuing Operations	$	192.3		$	—		$	43.9		$	88.1		$	67.4		$	(7.1	)
Identifiable assets of continuing operations	$	3,373.6		$	—		$	1,406.8		$	667.1		$	1,246.9		$	52.8
Goodwill	9.8			—			5.6			—			4.2			—
Investment in unconsolidated affiliate	27.9			—			—			—			27.9			—
Cash capital expenditures	320.3			—			108.6			90.6			121.0			0.1
Accrued capital expenditures	330.4			—			110.9			94.1			125.0			0.4