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Acquisitions (Tables)
9 Months Ended
Sep. 30, 2011
Acquisitions [Abstract] 
Pro Forma Condensed Consolidated Income Statement Information
     2011     2010  

Net service revenue

   $ 1,146.5      $ 1,295.5   

Operating income

     (489.2     160.5   

Net income

     (386.1     92.8   

Basic earnings per share

   $ (13.51   $ 3.31   

Diluted earnings per share

   $ (13.51   $ 3.26