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OPERATING REVENUE
 12 Months Ended
Dec. 31, 2016
Regulated and Unregulated Operating Revenue [Abstract]  
OPERATING REVENUE
OPERATING REVENUE
Questar Gas' operating revenue consists of the following:
Year Ended December 31,
2016

2015

2014

(millions)
 
 
 
Residential and commercial gas sales
$
854.6

$
847.3

$
875.7

Industrial gas sales
17.3

23.6

29.9

Gas transportation
24.6

21.2

17.9

Other(1)
24.8

25.5

37.4

Total operating revenue
$
921.3

$
917.6

$
960.9


(1) See Note 18 for amounts attributable to affiliates