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Business Acquisitions, Goodwill, and Intangible Assets (Details 3) (USD $)
 3 Months Ended 12 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
item
Sep. 30, 2013
Professional Technical Services
Sep. 30, 2012
Professional Technical Services
Dec. 31, 2012
Management Support Services
Sep. 30, 2012
Management Support Services
Dec. 31, 2011
Management Support Services
Sep. 30, 2013
Management Support Services
Dec. 31, 2012
EMEA
Dec. 31, 2011
EMEA
Business Acquisitions, Goodwill, and Intangible Assets                      
Number of reporting units     2                
Goodwill                      
Market multiple of revenue           0.35   0.5   0.35 0.5
Carrying value before impairment             $ 347,800,000     $ 345,500,000  
Goodwill impairment (336,000,000)   (336,000,000)   (155,000,000)   (181,000,000)     (155,000,000)  
Carrying value after impairment             166,800,000     190,500,000  
Goodwill Impairment, net of tax     317,200,000                
Changes in the carrying value of goodwill by reporting segment                      
Goodwill at the beginning of the period   1,775,352,000 2,086,300,000 1,608,600,000 1,733,900,000   352,400,000   166,800,000    
Post-Acquisition Adjustments     (5,800,000)   (1,200,000)   (4,600,000)        
Foreign Exchange Impact   (36,200,000) 20,400,000 (36,200,000) 20,400,000            
Acquired   72,600,000 10,500,000 72,600,000 10,500,000            
Goodwill impairment (336,000,000)   (336,000,000)   (155,000,000)   (181,000,000)     (155,000,000)  
Goodwill at the end of the period $ 1,775,352,000 $ 1,811,754,000 $ 1,775,352,000 $ 1,645,000,000 $ 1,608,600,000   $ 166,800,000   $ 166,800,000