Operations by Line of Business (Notes)
 3 Months Ended
Mar. 31, 2015
Segment Reporting [Abstract]  
Operations by Line of Business
Note 8 - 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
 
12 Months Ended
 
March 31,
 
March 31,
 
2015
 
2014
 
2015
 
2014
 
(in millions)
Revenues from Unaffiliated Customers
 
 
 
 
 
 
 
Questar Gas
$
374.8

 
$
396.3

 
$
939.4

 
$
963.2

Wexpro
6.3

 
12.3

 
29.6

 
47.1

Questar Pipeline
46.8

 
48.0

 
189.0

 
189.2

Other
0.7

 
0.3

 
3.0

 
0.5

Total
$
428.6

 
$
456.9

 
$
1,161.0

 
$
1,200.0

 
 
 
 
 
 
 
 
Revenues from Affiliated Companies 
 
 
 
 
 
 
 
Questar Gas
$
—

 
$
—

 
$
—

 
$
0.3

Wexpro
84.8

 
89.1

 
346.0

 
311.1

Questar Pipeline
19.4

 
19.3

 
73.8

 
76.5

Total
$
104.2

 
$
108.4

 
$
419.8

 
$
387.9

 
 
 
 
 
 
 
 
Operating Income (Loss)
 
 
 
 
 
 
 
Questar Gas
$
76.6

 
$
69.8

 
$
116.3

 
$
107.4

Wexpro
41.7

 
48.5

 
176.5

 
176.4

Questar Pipeline
27.4

 
30.1

 
114.9

 
35.4

Corporate and other
1.3

 
(0.1
)
 
(3.6
)
 
3.5

Total
$
147.0

 
$
148.3

 
$
404.1

 
$
322.7

 
 
 
 
 
 
 
 
Net Income (Loss)
 
 
 
 
 
 
 
Questar Gas
$
43.8

 
$
39.6

 
$
59.4

 
$
55.4

Wexpro
27.7

 
31.8

 
118.7

 
116.1

Questar Pipeline
13.9

 
15.7

 
58.8

 
8.1

Corporate and other
(0.8
)
 
(2.0
)
 
(10.9
)
 
(6.2
)
Total
$
84.6

 
$
85.1

 
$
226.0

 
$
173.4