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Operations by Line of Business (Notes)
 6 Months Ended
Jun. 30, 2014
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
 
6 Months Ended
 
12 Months Ended
 
June 30,
 
June 30,
 
June 30,
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
 
(in millions)
Revenues from Unaffiliated Customers
 
 
 
 
 
 
 
 
 
 
 
Questar Gas
$
145.0

 
$
140.1

 
$
541.3

 
$
558.4

 
$
968.1

 
$
921.9

Wexpro
7.8

 
8.5

 
20.1

 
18.8

 
46.4

 
37.6

Questar Pipeline
48.1

 
47.0

 
96.1

 
95.3

 
190.3

 
197.8

Other
0.4

 
—

 
0.7

 
—

 
0.9

 
—

Total
$
201.3

 
$
195.6

 
$
658.2

 
$
672.5

 
$
1,205.7

 
$
1,157.3

 
 
 
 
 
 
 
 
 
 
 
 
Revenues from Affiliated Companies 
 
 
 
 
 
 
 
 
 
 
 
Questar Gas
$
—

 
$
0.1

 
$
—

 
$
0.4

 
$
0.2

 
$
1.1

Wexpro
94.9

 
74.3

 
184.0

 
147.1

 
331.7

 
285.9

Questar Pipeline
17.7

 
17.7

 
37.0

 
37.2

 
76.5

 
74.8

Total
$
112.6

 
$
92.1

 
$
221.0

 
$
184.7

 
$
408.4

 
$
361.8

 
 
 
 
 
 
 
 
 
 
 
 
Operating Income (Loss)
 
 
 
 
 
 
 
 
 
 
 
Questar Gas
$
0.3

 
$
2.2

 
$
70.1

 
$
66.5

 
$
105.5

 
$
96.1

Wexpro
45.8

 
41.4

 
94.3

 
81.2

 
180.8

 
162.4

Questar Pipeline
30.4

 
28.1

 
60.5

 
58.3

 
37.7

 
119.7

Corporate and other
—

 
(0.5
)
 
(0.1
)
 
(3.4
)
 
4.0

 
(3.4
)
Total
$
76.5

 
$
71.2

 
$
224.8

 
$
202.6

 
$
328.0

 
$
374.8

 
 
 
 
 
 
 
 
 
 
 
 
Net Income (Loss)
 
 
 
 
 
 
 
 
 
 
 
Questar Gas
$
(3.3
)
 
$
(1.2
)
 
$
36.3

 
$
35.8

 
$
53.3

 
$
50.3

Wexpro
30.1

 
28.4

 
61.9

 
54.7

 
117.8

 
108.5

Questar Pipeline
15.7

 
14.5

 
31.4

 
30.3

 
9.3

 
62.3

Corporate and other
(2.2
)
 
(2.3
)
 
(4.2
)
 
(8.5
)
 
(6.1
)
 
(11.2
)
Total
$
40.3

 
$
39.4

 
$
125.4

 
$
112.3

 
$
174.3

 
$
209.9