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Acquisitions (Acquisitions Costs, by Acquisition) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 0 Months Ended 12 Months Ended
Mar. 31, 2013
May 15, 2012
Apex Systems
Dec. 31, 2012
Apex Systems
Business Acquisition [Line Items]      
Effective Date of Acquisition   May 15, 2012  
Name of Acquired Entity   Apex Systems, Inc.  
Business Acquisition, Description of Acquired Entity   a privately-owned provider of information technology staffing services headquartered in Richmond, Virginia (Apex)  
Reason for Business Combination   The primary reason for the acquisition was to expand the Company's information technology staffing services.  
Cost of acquired entity, purchase price   $ 610.8  
Cost of acquired entity, cash paid   385.3  
Shares of Company's common stock issued (in shares)   14.3  
Acquisition costs expensed     $ 9.8
Purchase Price Allocation, Methodology Assets and liabilities of the acquired companies were recorded at their estimated fair values at the dates of acquisition. The excess purchase price over the fair value of net tangible assets and identifiable intangible assets acquired has been allocated to goodwill    
Purchase Price Allocation, Status The Company's allocation of the purchase price for Apex has been finalized, except for the pre-acquisition contingencies and income taxes related to the acquisition.