Annual report pursuant to Section 13 and 15(d)

Property and Equipment, Net of Accumulated Depreciation (Details)

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Property and Equipment, Net of Accumulated Depreciation (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
May 31, 2012
May 31, 2011
May 31, 2010
Components of property and equipment, at cost      
Land and improvements $ 7.0 $ 7.0  
Buildings and improvements 96.8 95.2  
Data processing equipment 212.3 204.6  
Software 263.5 231.2  
Furniture, fixtures, and equipment 154.2 152.0  
Leasehold improvements 96.0 93.3  
Construction in progress 28.2 20.9  
Total property and equipment, gross 858.0 804.2  
Less: Accumulated depreciation and amortization 533.7 495.5  
Property and equipment, net of accumulated depreciation 324.3 308.7  
Property and Equipment, Net of Accumulated Depreciation (Textual) [Abstract]      
Depreciation expense $ 74.8 $ 68.4 $ 65.4