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Operations by Line of Business (Tables)
9 Months Ended
Sep. 30, 2011
Operations by Line of Business [Abstract] 
Summary of operations by line of business
Following is a summary of operations by line of business:

 
3 Months Ended
Sept. 30,
9 Months Ended
Sept. 30,
12 Months Ended
Sept. 30,
 
2011
2010
2011
2010
2011
2010
 
(in millions)
Revenues from Unaffiliated Customers
       
Wexpro
$    6.9 
$    6.1 
$ 23.1 
$ 16.6 
$    31.1 
$     23.4 
Questar Pipeline
50.0 
49.3 
148.8 
145.2 
200.8 
190.0 
Questar Gas
89.8 
89.8 
667.7 
599.1 
970.4 
891.5 
Total
$146.7 
$145.2 
$839.6 
$760.9 
$1,202.3 
$1,104.9 
--
           
Revenues from Affiliated Companies 
       
Wexpro
$  64.4 
$  58.4 
$186.4 
$179.1 
$  247.5 
$  237.6 
Questar Pipeline
18.5 
18.2 
55.8 
55.5 
74.3 
74.1 
Questar Gas
0.4 
0.2 
2.2 
0.6 
2.7 
1.0 
Total
$  83.3 
$  76.8 
$244.4 
$235.2 
$  324.5 
$  312.7 
--
           
Operating Income (Loss)
           
Wexpro
$  37.7 
$  32.8 
$108.3 
$ 98.9 
$  143.1 
$  133.1 
Questar Pipeline
33.9 
31.9 
94.9 
96.7 
129.0 
124.5 
Questar Gas
(7.9)
(10.3)
56.6 
49.4 
95.8 
85.9 
Corporate
0.1 
- 
0.5 
(9.5)
0.2 
(8.1)
Total
$  63.8 
$  54.4 
$260.3 
$235.5 
$  368.1 
$  335.4 
 
Income (Loss) From Continuing Operations
           
Wexpro
$  25.6 
$  22.2 
$  71.6 
$ 65.4 
$    94.3 
$     86.9 
Questar Pipeline
18.8 
16.3 
50.7 
49.4 
68.7 
63.8 
Questar Gas
(7.9)
(9.1)
25.9 
21.8 
48.0 
41.7 
Corporate
(0.4)
(1.7)
(1.9)
(8.0)
(1.0)
(8.4)
Total
$  36.1 
$  27.7 
$146.3 
$128.6 
$  210.0 
$  184.0