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Operations by Line of Business (Tables)
 6 Months Ended
Jun. 30, 2016
Segment Reporting [Abstract]  
Summary of operations by line of business
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