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Operations by Line of Business
 9 Months Ended
Sep. 30, 2013
Segment Reporting [Abstract]  
Operations by line of business
Note 9 - Operations by Line of Business

Questar's three principal complementary lines of business include Questar Gas, which provides retail natural gas distribution in Utah, Wyoming and Idaho; Wexpro, which develops and produces natural gas from cost-of-service reserves for Questar Gas customers; and Questar Pipeline, which operates interstate natural gas pipelines and storage facilities. Line-of-business information is presented according to senior management's basis for evaluating performance and considering differences in the nature of products, services and regulation, among other factors. Following is a summary of operations by line of business:
 
3 Months Ended
 
9 Months Ended
 
12 Months Ended
 
September 30,
 
September 30,
 
September 30,
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
 
(in millions)
Revenues from Unaffiliated Customers
 
 
 
 
 
 
 
 
 
 
 
Questar Gas
$
89.4

 
$
82.5

 
$
647.8

 
$
578.7

 
$
928.8

 
$
876.5

Wexpro
13.2

 
9.8

 
32.0

 
27.1

 
41.0

 
35.5

Questar Pipeline
47.0

 
49.5

 
142.3

 
150.1

 
195.3

 
198.7

Total
$
149.6

 
$
141.8

 
$
822.1

 
$
755.9

 
$
1,165.1

 
$
1,110.7

 
 
 
 
 
 
 
 
 
 
 
 
Revenues from Affiliated Companies 
 
 
 
 
 
 
 
 
 
 
 
Questar Gas
$
0.2

 
$
0.5

 
$
0.6

 
$
2.3

 
$
0.8

 
$
3.4

Wexpro
68.1

 
69.3

 
215.2

 
204.6

 
284.7

 
271.8

Questar Pipeline
17.6

 
18.4

 
54.8

 
55.2

 
74.0

 
73.8

Total
$
85.9

 
$
88.2

 
$
270.6

 
$
262.1

 
$
359.5

 
$
349.0

 
 
 
 
 
 
 
 
 
 
 
 
Operating Income (Loss)
 
 
 
 
 
 
 
 
 
 
 
Questar Gas
$
(11.2
)
 
$
(10.7
)
 
$
55.3

 
$
52.6

 
$
95.6

 
$
90.1

Wexpro
40.7

 
41.0

 
121.9

 
117.9

 
162.1

 
155.3

Questar Pipeline
(52.6
)
 
32.6

 
5.7

 
95.2

 
34.5

 
126.2

Corporate and other
3.7

 
0.7

 
0.3

 
1.4

 
(0.4
)
 
2.1

Total
$
(19.4
)
 
$
63.6

 
$
183.2

 
$
267.1

 
$
291.8

 
$
373.7

 
 
 
 
 
 
 
 
 
 
 
 
Net Income (Loss)
 
 
 
 
 
 
 
 
 
 
 
Questar Gas
$
(9.0
)
 
$
(9.3
)
 
$
26.8

 
$
23.3

 
$
50.6

 
$
43.5

Wexpro
27.5

 
26.4

 
82.2

 
76.5

 
109.6

 
100.1

Questar Pipeline
(37.9
)
 
17.1

 
(7.6
)
 
49.8

 
7.3

 
67.0

Corporate and other
0.2

 
(0.4
)
 
(8.3
)
 
(1.4
)
 
(10.6
)
 
(0.8
)
Total
$
(19.2
)
 
$
33.8

 
$
93.1

 
$
148.2

 
$
156.9

 
$
209.8