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OPERATING REVENUE (Tables)
 12 Months Ended
Dec. 31, 2017
Regulated And Unregulated Operating Revenue [Abstract]  
Operating Revenue

Questar Gas' operating revenue consists of the following:

 

Year Ended December 31,

 

2017

 

 

2016

 

 

2015

 

(millions)

 

 

 

 

 

 

 

 

 

 

 

 

Residential and commercial gas sales

 

$

877.8

 

 

$

854.6

 

 

$

847.3

 

Industrial gas sales

 

 

11.7

 

 

 

17.3

 

 

 

23.6

 

Gas transportation

 

 

26.2

 

 

 

24.6

 

 

 

21.2

 

Other(1)

 

 

31.3

 

 

 

24.8

 

 

 

25.5

 

Total operating revenue

 

$

947.0

 

 

$

921.3

 

 

$

917.6

 

 

(1)

See Note 19 for amounts attributable to affiliates