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Operating Segment (Tables)
 3 Months Ended
Mar. 31, 2017
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment
The following table presents segment information pertaining to Questar Gas' operations:
 
Questar
Gas

Corporate
and Other

Consolidated Total

(millions)
 
 
 
Three Months Ended March 31, 2017
 
 
 
Operating revenue
$
396.9

$
—

$
396.9

Net income (loss)
52.4

(0.2
)
52.2

Three Months Ended March 31, 2016
 

 

 

Operating revenue
$
407.9

$
—

$
407.9

Net income
47.6

—

47.6