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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2011
Fair Value Measurements [Abstract]  
Assets (liabilities) measured at fair value on a recurring basis
                                 
    Level 1     Level 2     Level 3     Total  
Cash Flow Hedges
  $ —     $ 5.6     $ —     $ 5.6  
 
                       
     The following table presents information about our assets (liabilities) measured at fair value on a recurring basis as of December 31, 2010, and indicates the fair value hierarchy we utilized to determine such fair value (in millions).
                                 
    Level 1     Level 2     Level 3     Total  
Cash Flow Hedges
  $ —     $ 6.8     $ —     $ 6.8