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Basis of Presentation of Interim Financial Statements (Tables)
 9 Months Ended
Sep. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Cost of sales detail
The details of Questar Gas' consolidated cost of sales are as follows:
 
3 Months Ended
 
9 Months Ended
 
September 30,
 
September 30,
 
2016
 
2015
 
2016
 
2015
 
(in millions)
Gas purchases
$
2.0

 
$
0.3

 
$
51.1

 
$
43.5

Operator service fee(1)
77.7

 
80.7

 
236.4

 
241.0

Transportation and storage(1)
17.8

 
18.1

 
57.5

 
58.4

Gathering
6.0

 
5.7

 
17.4

 
16.7

Royalties
5.7

 
7.6

 
16.0

 
26.4

Storage (injection), net
(44.2
)
 
(42.8
)
 
(23.4
)
 
(28.6
)
Purchased-gas account adjustment
(26.6
)
 
(26.4
)
 
5.5

 
0.9

Other
1.3

 
1.2

 
3.9

 
3.7

Total cost of natural gas sold
$
39.7

 
$
44.4

 
$
364.4

 
$
362.0


(1) See Note 9 for amounts attributable to affiliates