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Quarterly Financial Information (Unaudited) (Tables)
12 Months Ended
Dec. 31, 2011
Quarterly Financial Information (Unaudited) [Abstract]  
Unaudited quarterly financial information
Following is a summary of unaudited quarterly financial information:
 
   
First Quarter
  
Second Quarter
  
Third Quarter
  
Fourth Quarter
  
Year
 
   
(in millions)
 
2011
               
Revenues (1)
 $617.9  $808.1  $879.9  $853.3  $3,159.2 
Operating income
  137.1   168.9   183.4   16.5   505.9 
Income from continuing operations
  73.8   93.5   102.4   0.7   270.4 
Net income (loss) attributable to QEP
  73.2   92.8   101.5   (0.3)  267.2 
Per share information attributable to QEP
                    
Basic EPS attributable to QEP
 $0.42  $0.52  $0.58  $(0.01) $1.51 
Diluted EPS attributable to QEP
  0.41   0.52   0.57   -   1.50 
2010
                    
Revenues (1)
 $592.1  $542.3  $578.3  $587.9  $2,300.6 
Operating income
  142.9   127.6   149.3   125.5   545.3 
Income from continuing operations
  78.7   69.5   71.9   65.8   285.9 
Discontinued operations, net of tax
  21.2   22.0   -   -   43.2 
Net income attributable to QEP
  99.3   90.8   71.1   65.0   326.2 
Per share information attributable to QEP
                    
Basic EPS from continuing operations
 $0.45  $0.39  $0.40  $0.37  $1.61 
Basic EPS attributable to QEP
  0.57   0.52   0.40   0.37   1.86 
Diluted EPS from continuing operations
  0.44   0.39   0.40   0.37   1.60 
Diluted EPS attributable to QEP
  0.56   0.51   0.40   0.37   1.84 
        
(1) During the year ended December 31, 2011, QEP revised its reporting of transportation and handling costs which have been recast on the Consolidated Income Statement from revenues to "Natural gas, oil and NGL transportation and other handling costs" for all periods presented. See Note 1, "Summary of Significant Accounting Policies" for additional information.