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Acquisitions (Tables)
6 Months Ended
Jun. 30, 2011
Acquisitions  
Pro Forma Condensed Consolidated Income Statement Information
     2011      2010  

Net service revenue

   $ 771.7       $ 865.3   

Operating income

     68.1         120.5   

Net income

     37.6         69.6   

Basic earnings per share

   $ 1.32       $ 2.49   

Diluted earnings per share

   $ 1.30       $ 2.44