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Acquisitions and Divestitures (Tables)
6 Months Ended
Jun. 30, 2012
Acquisitions and Divestitures [Abstract]  
Acquisition and divestiture activity
                                                 
    Acquisitions     Divestitures  
    Total cost     Net cash
paid
    Goodwill
recorded
    Proceeds     Gain
recognized
    Goodwill
charged  off
 
                (in millions)              

2012

  $ 2.0     $ —       $  0.8     $  2.1     $  1.5     $  0.1  

2011

  $ 23.6     $ 15.3     $ 7.0     $ 8.3     $ 0.7     $ 1.0