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Discontinued Operations (Tables)
12 Months Ended
Dec. 31, 2012
Discontinued Operations and Disposal Groups [Abstract]  
Schedule of discontinued operations
QEP operations are reflected as discontinued operations in this Annual Report on Form 10-K and summarized below. There were no discontinued operations in 2012 or 2011.
 
Year Ended December 31,
 
2010
 
(in millions)
Revenues
$
1,109.8

Operating income
270.5

 
 
Discontinued operations, net of income taxes of $86.3 million
148.2

Discontinued operations, noncontrolling interest
(1.3
)
Total discontinued operations, net of income taxes
$
146.9

Earnings Per Common Share Attributable To Questar
 
Basic from discontinued operations
$
0.84

Diluted from discontinued operations
0.83