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Acquisitions and Divestitures (Tables)
9 Months Ended
Sep. 30, 2011
Acquisitions and Divestitures [Abstract] 
Acquisition and divestiture activity
                 
    Three Months Ended   Nine Months Ended
    September 30, 2011   September 30, 2011
    (in millions)
Acquisitions:
               
Purchase price
  $ 32.8     $ 56.4  
Net cash paid
  $ 27.2     $ 42.5  
Goodwill recorded
  $ 22.3     $ 29.3  
 
               
Divestitures:
               
Proceeds
  $     $ 8.3  
Gain recognized
  $     $ 0.7  
Goodwill charged off
  $     $ 1.0