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Operations by Line of Business (Tables)
 9 Months Ended
Sep. 30, 2015
Segment Reporting [Abstract]  
Summary of operations by line of business
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,
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
 
(in millions)
Revenues from Unaffiliated Customers
 
 
 
 
 
 
 
 
 
 
 
Questar Gas
$
89.3

 
$
100.7

 
$
605.8

 
$
642.0

 
$
924.7

 
$
979.4

Wexpro
6.4

 
9.4

 
22.8

 
29.5

 
28.9

 
42.6

Questar Pipeline
45.0

 
47.3

 
138.3

 
143.4

 
185.1

 
190.6

Other
1.6

 
0.5

 
3.3

 
1.2

 
4.7

 
1.4

Total
$
142.3

 
$
157.9

 
$
770.2

 
$
816.1

 
$
1,143.4

 
$
1,214.0

 
 
 
 
 
 
 
 
 
 
 
 
Revenues from Affiliated Companies 
 
 
 
 
 
 
 
 
 
 
 
Wexpro
$
80.7

 
$
82.3

 
$
241.1

 
$
266.3

 
$
325.1

 
$
345.9

Questar Pipeline
17.6

 
17.7

 
54.8

 
54.7

 
73.8

 
76.6

Total
$
98.3

 
$
100.0

 
$
295.9

 
$
321.0

 
$
398.9

 
$
422.5

 
 
 
 
 
 
 
 
 
 
 
 
Operating Income (Loss)
 
 
 
 
 
 
 
 
 
 
 
Questar Gas
$
(8.9
)
 
$
(9.4
)
 
$
69.1

 
$
60.7

 
$
117.9

 
$
107.3

Wexpro
40.7

 
47.2

 
124.2

 
141.5

 
166.0

 
187.3

Questar Pipeline
28.8

 
28.8

 
85.5

 
89.3

 
113.8

 
119.1

Corporate and other
1.7

 
2.3

 
5.8

 
2.2

 
(1.4
)
 
2.6

Total
$
62.3

 
$
68.9

 
$
284.6

 
$
293.7

 
$
396.3

 
$
416.3

 
 
 
 
 
 
 
 
 
 
 
 
Net Income (Loss)
 
 
 
 
 
 
 
 
 
 
 
Questar Gas
$
(8.8
)
 
$
(9.1
)
 
$
32.2

 
$
27.2

 
$
60.2

 
$
53.2

Wexpro
26.9

 
31.1

 
82.5

 
93.0

 
112.3

 
121.4

Questar Pipeline
15.2

 
14.9

 
44.3

 
46.3

 
58.6

 
62.1

Corporate and other
(0.7
)
 
1.7

 
(1.2
)
 
(2.5
)
 
(10.8
)
 
(4.6
)
Total
$
32.6

 
$
38.6

 
$
157.8

 
$
164.0

 
$
220.3

 
$
232.1