Basis of Presentation of Interim Financial Statements (Tables)

3 Months Ended

Mar. 31, 2015

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Cost of sales detail

The details of Questar's consolidated cost of sales are as follows:

	3 Months Ended						12 Months Ended
	March 31,						March 31,
	2015			2014			2015			2014
	(in millions)
Questar Gas
Gas purchases	$	41.0		$	92.7		$	84.8		$	176.0
Operator service fee	84.8			89.1			345.4			310.9
Transportation and storage	22.2			22.1			79.7			80.2
Gathering	5.4			4.9			21.5			19.1
Royalties	11.9			17.3			54.7			50.5
Storage (injection) withdrawal, net	30.9			33.0			(3.2		)	3.4
Purchased-gas account adjustment	36.2			(5.6		)	(4.0		)	(30.3		)
Other	1.2			1.1			4.9			4.8
Total Questar Gas cost of natural gas sold	233.6			254.6			583.8			614.6
Elimination of Questar Gas cost of natural gas sold - affiliated companies	(104.0		)	(108.2		)	(419.2		)	(387.0		)
Total Questar Gas cost of natural gas sold - unaffiliated parties	129.6			146.4			164.6			227.6
Questar Pipeline
Total Questar Pipeline cost of sales	1.9			1.7			4.2			6.6
Other cost of sales	0.3			0.1			1.1			0.2
Total cost of sales	$	131.8		$	148.2		$	169.9		$	234.4