Operating Segment (Tables)

6 Months Ended

Jun. 30, 2017

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

The following table presents segment information pertaining to Questar Gas' operations:

	Gas Infrastructure			Corporate and Other			Consolidated Total
(millions)
Three Months Ended June 30, 2017
Operating revenue	$	139.7		$	—		$	139.7
Net income (loss)		0.7			(6.9	)		(6.2	)
Three Months Ended June 30, 2016
Operating revenue	$	128.2		$	—		$	128.2
Net loss		(1.6	)		—			(1.6	)
Six Months Ended June 30, 2017
Operating revenue	$	536.6		$	—		$	536.6
Net income (loss)		53.1			(7.1	)		46.0
Six Months Ended June 30, 2016
Operating revenue	$	536.1		$	—		$	536.1
Net income		46.0			—			46.0