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Discontinued Operations (Tables)
12 Months Ended
Dec. 31, 2012
Discontinued operations [Line Items]  
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block]
Wexpro's operating results prior to the Spin-off are reflected in this Annual Report on Form 10-K as discontinued operations and summarized in the table below:
 
Year Ended December 31,
 
2012
 
2011
 
2010
 
(in millions, except per share amounts)
Revenues
$

 
$

 
$
131.2

Income before income taxes

 

 
67.4

Income taxes

 

 
(24.2
)
Discontinued operations, net of income taxes
$

 
$

 
$
43.2

Earnings per common share attributable to QEP
 
 
 
 
 
Basic from discontinued operations
$

 
$

 
$
0.25

Diluted from discontinued operations

 

 
0.24