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Basis of Presentation of Interim Financial Statements (Tables)
 9 Months Ended
Sep. 30, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Cost of sales detail
The details of Questar's consolidated cost of sales are as follows:
 
3 Months Ended
 
9 Months Ended
 
12 Months Ended
 
September 30,
 
September 30,
 
September 30,
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
 
(in millions)
Questar Gas
 
 
 
 
 
 
 
 
 
 
 
Gas purchases
$
0.1

 
$
—

 
$
113.7

 
$
64.3

 
$
153.6

 
$
131.5

Operator service fee
68.2

 
69.3

 
215.2

 
204.5

 
284.7

 
271.6

Transportation and storage
18.5

 
19.0

 
58.6

 
58.5

 
79.7

 
78.6

Gathering
4.5

 
4.8

 
13.6

 
16.0

 
18.1

 
22.3

Royalties
11.0

 
7.0

 
32.4

 
23.4

 
41.0

 
34.3

Storage (injection) withdrawal, net
(37.3
)
 
(29.0
)
 
(18.1
)
 
(18.1
)
 
1.9

 
(8.8
)
Purchased-gas account adjustment
(15.9
)
 
(27.6
)
 
5.1

 
4.0

 
17.2

 
17.1

Other
1.0

 
1.2

 
3.7

 
3.8

 
4.9

 
5.0

Total Questar Gas cost of natural gas sold
50.1

 
44.7

 
424.2

 
356.4

 
601.1

 
551.6

Elimination of Questar Gas cost of natural gas sold - affiliated parties
(85.6
)
 
(87.5
)
 
(269.5
)
 
(259.2
)
 
(358.0
)
 
(344.8
)
Total Questar Gas cost of natural gas sold - unaffiliated parties
(35.5
)
 
(42.8
)
 
154.7

 
97.2

 
243.1

 
206.8

Questar Pipeline
 
 
 
 
 
 
 
 
 
 
 
Total Questar Pipeline cost of sales
0.5

 
0.7

 
2.7

 
1.9

 
7.5

 
2.7

Total cost of sales
$
(35.0
)
 
$
(42.1
)
 
$
157.4

 
$
99.1

 
$
250.6

 
$
209.5