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Comprehensive Income
6 Months Ended
Jun. 30, 2011
Comprehensive Incomes [Abstract]  
Comprehensive Income
Note 5 — Comprehensive Income
     The following table illustrates the components of comprehensive income for the three and six-month periods ended June 30, 2011 and 2010:
                                 
    Three Months Ended     Six Months Ended  
    June 30,     June 30,  
    2011     2010     2011     2010  
    (in millions)  
Net income
  $ 57.2     $ 27.9     $ 97.0     $ 53.3  
Other comprehensive income, net of tax effect:
                               
Adjustment for fair value accounting of derivatives
    36.1       15.0       3.6       28.1  
 
                       
Comprehensive income
  $ 93.3     $ 42.9     $ 100.6     $ 81.4