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Basis of Presentation of Interim Financial Statements (Tables)
 6 Months Ended
Jun. 30, 2014
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
 
6 Months Ended
 
12 Months Ended
 
June 30,
 
June 30,
 
June 30,
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
 
(in millions)
Questar Gas
 
 
 
 
 
 
 
 
 
 
 
Gas purchases
$
3.9

 
$
10.3

 
$
96.6

 
$
113.6

 
$
169.6

 
$
153.5

Operator service fee
94.4

 
74.2

 
183.5

 
147.0

 
331.1

 
285.8

Transportation and storage
18.6

 
18.1

 
40.7

 
40.1

 
80.7

 
80.2

Gathering
4.8

 
4.5

 
9.7

 
9.1

 
19.4

 
18.4

Royalties
18.3

 
10.3

 
35.6

 
21.4

 
58.5

 
37.0

Storage (injection) withdrawal, net
(21.6
)
 
(9.6
)
 
11.4

 
19.2

 
(8.6
)
 
10.2

Purchased-gas account adjustment
(32.5
)
 
(25.7
)
 
(38.1
)
 
21.0

 
(37.1
)
 
5.5

Other
1.3

 
1.4

 
2.4

 
2.7

 
4.7

 
5.1

Total Questar Gas cost of natural gas sold
87.2

 
83.5

 
341.8

 
374.1

 
618.3

 
595.7

Elimination of Questar Gas cost of natural gas sold - affiliated parties
(112.5
)
 
(91.8
)
 
(220.7
)
 
(183.9
)
 
(407.7
)
 
(359.9
)
Total Questar Gas cost of natural gas sold - unaffiliated parties
(25.3
)
 
(8.3
)
 
121.1

 
190.2

 
210.6

 
235.8

Questar Pipeline
 
 
 
 
 
 
 
 
 
 
 
Total Questar Pipeline cost of sales
0.7

 
1.0

 
2.4

 
2.2

 
6.3

 
7.7

Other cost of sales
0.3

 
—

 
0.4

 
—

 
0.5

 
—

Total cost of sales
$
(24.3
)
 
$
(7.3
)
 
$
123.9

 
$
192.4

 
$
217.4

 
$
243.5