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Operations by Line of Business
 6 Months Ended
Jun. 30, 2016
Segment Reporting [Abstract]  
Operations by Line of Business
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 and provides other energy services. 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,
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
(in millions)
Revenues from Unaffiliated Customers
 
 
 
 
 
 
 
 
 
 
 
Questar Gas
$
128.2

 
$
141.7

 
$
536.1

 
$
516.5

 
$
937.2

 
$
936.1

Wexpro
1.9

 
10.1

 
5.4

 
16.4

 
11.9

 
31.9

Questar Pipeline
42.9

 
46.5

 
85.9

 
93.3

 
180.5

 
187.4

Other
1.1

 
1.0

 
3.0

 
1.7

 
7.8

 
3.6

Total
$
174.1

 
$
199.3

 
$
630.4

 
$
627.9

 
$
1,137.4

 
$
1,159.0

 
 
 
 
 
 
 
 
 
 
 
 
Revenues from Affiliated Companies 
 
 
 
 
 
 
 
 
 
 
 
Wexpro
$
78.9

 
$
75.6

 
$
158.7

 
$
160.4

 
$
317.4

 
$
326.7

Questar Pipeline
17.5

 
17.8

 
36.8

 
37.2

 
74.7

 
73.9

Total
$
96.4

 
$
93.4

 
$
195.5

 
$
197.6

 
$
392.1

 
$
400.6

 
 
 
 
 
 
 
 
 
 
 
 
Operating Income (Loss)
 
 
 
 
 
 
 
 
 
 
 
Questar Gas
$
3.8

 
$
1.4

 
$
87.2

 
$
78.0

 
$
131.8

 
$
117.4

Wexpro
39.1

 
41.8

 
78.8

 
83.5

 
142.7

 
172.5

Questar Pipeline
26.4

 
29.3

 
54.0

 
56.7

 
111.7

 
113.8

Corporate and other
(4.9
)
 
2.8

 
(19.9
)
 
4.1

 
(34.0
)
 
(0.8
)
Total
$
64.4

 
$
75.3

 
$
200.1

 
$
222.3

 
$
352.2

 
$
402.9

 
 
 
 
 
 
 
 
 
 
 
 
Net Income (Loss)
 
 
 
 
 
 
 
 
 
 
 
Questar Gas
$
(1.6
)
 
$
(2.8
)
 
$
46.0

 
$
41.0

 
$
69.3

 
$
59.9

Wexpro
26.1

 
27.9

 
52.3

 
55.6

 
95.6

 
116.5

Questar Pipeline
13.6

 
15.2

 
27.8

 
29.1

 
58.3

 
58.3

Corporate and other
(5.0
)
 
0.3

 
(14.5
)
 
(0.5
)
 
(28.1
)
 
(8.4
)
Total
$
33.1

 
$
40.6

 
$
111.6

 
$
125.2

 
$
195.1

 
$
226.3