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Basis of Presentation of Interim Financial Statements (Tables)
 9 Months Ended
Sep. 30, 2015
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,
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
 
(in millions)
Questar Gas
 
 
 
 
 
 
 
 
 
 
 
Gas purchases
$
0.3

 
$
0.1

 
$
43.5

 
$
96.7

 
$
83.3

 
$
169.6

Operator service fee
80.7

 
82.3

 
241.0

 
265.8

 
324.9

 
345.2

Transportation and storage
18.1

 
18.1

 
58.4

 
58.8

 
79.2

 
80.3

Gathering
5.7

 
4.5

 
16.7

 
14.2

 
23.5

 
19.4

Royalties
7.6

 
14.9

 
26.4

 
50.5

 
36.0

 
62.4

Storage (injection),net
(42.8
)
 
(39.0
)
 
(28.6
)
 
(27.6
)
 
(2.1
)
 
(10.3
)
Purchased-gas account adjustment
(26.4
)
 
(25.3
)
 
0.9

 
(63.4
)
 
18.5

 
(46.5
)
Other
1.2

 
1.2

 
3.7

 
3.6

 
4.9

 
4.9

Total Questar Gas cost of natural gas sold
44.4

 
56.8

 
362.0

 
398.6

 
568.2

 
625.0

Elimination of Questar Gas cost of natural gas sold - affiliated companies
(98.2
)
 
(99.9
)
 
(295.4
)
 
(320.6
)
 
(398.2
)
 
(422.0
)
Total Questar Gas cost of natural gas sold - unaffiliated parties
(53.8
)
 
(43.1
)
 
66.6

 
78.0

 
170.0

 
203.0

Questar Pipeline
 
 
 
 
 
 
 
 
 
 
 
Total Questar Pipeline cost of sales
0.6

 
0.6

 
2.3

 
3.0

 
3.3

 
6.4

Other cost of sales
0.6

 
0.2

 
1.3

 
0.6

 
1.6

 
0.7

Total cost of sales
$
(52.6
)
 
$
(42.3
)
 
$
70.2

 
$
81.6

 
$
174.9

 
$
210.1