Operations by Line of Business (Tables)

12 Months Ended

Dec. 31, 2015

Segment Reporting [Abstract]

Summary of operations by line of business

The following is a summary of operations by line of business for the three years ended December 31, 2015:

	Questar Consol.			Interco. Trans.			Questar Gas			Wexpro			Questar Pipeline			Corp and Other
	(in millions)
2015
Revenues
From unaffiliated customers	$	1,134.9		$	—		$	917.6		$	22.9		$	187.9		$	6.5
From affiliated companies	—			(394.2		)	—			319.1			75.1			—
Total Revenues	1,134.9			(394.2		)	917.6			342.0			263.0			6.5
Operating Expenses
Cost of sales	175.2			(393.5		)	558.1			—			8.9			1.7
Operating and maintenance	181.6			—			111.9			29.6			37.6			2.5
General and administrative	109.0			(0.7		)	50.6			33.5			38.9			(13.3		)
Pension settlement costs	16.7			—			—			—			—			16.7
Production and other taxes	51.3			—			19.3			21.2			8.8			2.0
Depreciation, depletion and amortization	216.0			—			55.1			99.4			54.6			6.9
Abandonment and impairment	12.5			—			—			12.5			—			—
Total Operating Expenses	762.3			(394.2		)	795.0			196.2			148.8			16.5
Net gain from asset sales	1.8			—			—			1.6			0.2			—
Operating Income (Loss)	374.4			—			122.6			147.4			114.4			(10.0		)
Interest and other income (expense)	4.2			(1.0		)	4.8			0.9			0.9			(1.4		)
Income from unconsolidated affiliate	3.7			—			—			—			3.7			—
Interest expense	(63.0		)	1.0			(28.3		)	(0.2		)	(26.0		)	(9.5		)
Income taxes	(110.6		)	—			(34.8		)	(49.2		)	(33.4		)	6.8
Net Income (Loss)	$	208.7		$	—		$	64.3		$	98.9		$	59.6		$	(14.1	)
Identifiable assets	4,377.8			—			2,126.8			920.6			1,227.3			103.1
Goodwill	9.8			—			5.6			—			4.2			—
Investment in unconsolidated affiliate	23.9			—			—			—			23.9
Cash capital expenditures, including acquisitions	330.4			—			228.8			46.4			40.6			14.6
Accrued capital expenditures, including acquisitions	328.0			—			232.6			42.9			39.5			13.0
2014
Revenues
From unaffiliated customers	$	1,189.3		$	—		$	960.9		$	35.6		$	190.2		$	2.6
From affiliated companies	—			(424.0		)	—			350.3			73.7			—
Total Revenues	1,189.3			(424.0		)	960.9			385.9			263.9			2.6
Operating Expenses
Cost of sales	186.3			(423.4		)	604.8			—			4.0			0.9
Operating and maintenance	194.2			—			122.5			31.5			39.3			0.9
General and administrative	122.7			(0.6		)	52.8			32.6			38.9			(1.0		)
Production and other taxes	66.2			—			17.8			37.6			9.1			1.7
Depreciation, depletion and amortization	213.7			—			53.6			100.5			54.5			5.1
Asset impairment	2.0			—			—			2.0			—			—
Total Operating Expenses	785.1			(424.0		)	851.5			204.2			145.8			7.6
Net gain (loss) from asset sales	1.2			—			0.1			1.6			(0.5		)	—

Operating Income (Loss)	405.4			—			109.5			183.3			117.6			(5.0		)
Interest and other income (expense)	6.6			(0.4		)	5.9			1.1			1.2			(1.2		)
Income from unconsolidated affiliate	3.5			—			—			—			3.5			—
Interest expense	(63.1		)	0.4			(28.2		)	(0.1		)	(26.1		)	(9.1		)
Income taxes	(125.9		)	—			(32.0		)	(61.5		)	(35.6		)	3.2
Net Income (Loss)	$	226.5		$	—		$	55.2		$	122.8		$	60.6		$	(12.1	)
Identifiable assets	$	4,243.9		$	—		$	1,917.4		$	970.6		$	1,230.5		$	125.4
Goodwill	9.8			—			5.6			—			4.2			—
Investment in unconsolidated affiliate	24.7			—			—			—			24.7			—
Cash capital expenditures, including acquisitions	371.5			—			174.7			114.4			59.4			23.0
Accrued capital expenditures, including acquisitions	359.7			—			161.5			114.7			61.3			22.2
2013
Revenues
From unaffiliated customers	$	1,220.0		$	—		$	985.2		$	45.1		$	189.5		$	0.2
From affiliated companies	—			(372.1		)	0.6			294.8			76.7			—
Total Revenues	1,220.0			(372.1		)	985.8			339.9			266.2			0.2
Operating Expenses
Cost of sales	285.9			(370.9		)	650.6			—			6.1			0.1
Operating and maintenance	179.4			—			113.1			28.6			37.6			0.1
General and administrative	115.9			(0.6		)	52.5			28.7			41.6			(6.3		)
Production and other taxes	57.4			—			18.0			28.3			9.3			1.8
Depreciation, depletion and amortization	194.8			—			49.7			85.8			55.5			3.8
Asset impairment	80.6			—			—			—			80.6			—
Other operating expenses	—			(0.6		)	—			0.6			—			—
Total Operating Expenses	914.0			(372.1		)	883.9			172.0			230.7			(0.5		)
Net loss from asset sales	(0.2		)	—			—			(0.2		)	—			—
Operating Income	305.8			—			101.9			167.7			35.5			0.7
Interest and other income (expense)	9.9			(0.7		)	5.1			5.0			1.8			(1.3		)
Income from unconsolidated affiliate	3.7			—			—			—			3.7			—
Interest expense	(56.9		)	0.7			(22.3		)	(0.1		)	(25.8		)	(9.4		)
Income taxes	(101.3		)	—			(31.9		)	(62.0		)	(7.0		)	(0.4		)
Net Income (Loss)	$	161.2		$	—		$	52.8		$	110.6		$	8.2		$	(10.4	)
Identifiable assets	$	4,044.6		$	—		$	1,759.1		$	988.3		$	1,221.0		$	76.2
Goodwill	9.8			—			5.6			—			4.2			—
Investment in unconsolidated affiliate	25.6			—			—			—			25.6			—
Cash capital expenditures	503.7			—			166.2			249.5			73.4			14.6
Accrued capital expenditures	505.6			—			177.3			240.7			70.0			17.6