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Operations by Line of Business (Tables)
 6 Months Ended
Jun. 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
June 30,
6 Months Ended
June 30,
12 Months Ended
June 30,
 
2011
2010
2011
2010
2011
2010
 
(in millions)
Revenues from Unaffiliated Customers
       
Wexpro
$    8.4 
$    4.3 
$ 16.2 
$ 10.5 
$    30.3 
$     22.5 
Questar Pipeline
50.5 
48.2 
98.8 
95.9 
200.1 
184.1 
Questar Gas
164.0 
148.6 
577.9 
509.3 
970.4 
884.0 
Total
$222.9 
$201.1 
$692.9 
$615.7 
$1,200.8 
$1,090.6 
 
           
Revenues from Affiliated Companies 
       
Wexpro
$  61.1 
$  60.2 
$122.0 
$120.7 
$  241.5 
$  233.0 
Questar Pipeline
18.7 
18.5 
37.3 
37.3 
74.0 
73.4 
Questar Gas
1.0 
0.1 
1.8 
0.4 
2.5 
0.9 
Total
$  80.8 
$  78.8 
$161.1 
$158.4 
$  318.0 
$  307.3 
 
           
Operating Income (Loss)
           
Wexpro
$  36.1 
$  33.3 
$  70.6 
$ 66.1 
$  138.2 
$  131.9 
Questar Pipeline
31.7 
31.3 
61.0 
64.8 
127.0 
120.8 
Questar Gas
5.7 
1.1 
64.5 
59.7 
93.4 
87.8 
Corporate
0.2 
(9.4)
0.4 
(9.5)
0.1 
(8.1)
Total
$  73.7 
$  56.3 
$196.5 
$181.1 
$  358.7 
$  332.4 
 
           
Income (Loss) From Continuing Operations
           
Wexpro
$  23.7 
$  22.0 
$  46.0 
$ 43.2 
$    90.9 
$     85.3 
Questar Pipeline
16.6 
15.9 
31.9 
33.1 
66.2 
61.6 
Questar Gas
0.4 
(2.2)
33.8 
30.9 
46.8 
42.7 
Corporate
(0.4)
(7.0)
(1.5)
(6.3)
(2.3)
(6.5)
Total
$  40.3 
$  28.7 
$110.2 
$100.9 
$  201.6 
$  183.1