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Property and Equipment, Net of Accumulated Depreciation (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
May 31, 2014
May 31, 2013
May 31, 2012
Components of property and equipment, at cost      
Land and improvements $ 8.1 $ 8.1  
Buildings and improvements 101.1 99.2  
Data processing equipment 180.8 175.6  
Software 344.8 290.1  
Furniture, fixtures, and equipment 145.0 145.2  
Leasehold improvements 101.7 99.5  
Construction in progress 25.3 32.8  
Total property and equipment, gross 906.8 850.5  
Less: Accumulated depreciation 564.6 504.5  
Property and equipment, net of accumulated depreciation 342.2 346.0  
Property and Equipment, Net of Accumulated Depreciation (Textual)      
Depreciation expense $ 89.1 $ 79.2 $ 74.8