Quarterly report pursuant to Section 13 or 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
3 Months Ended
Aug. 31, 2015
Aug. 31, 2014
May. 31, 2015
Components of property and equipment, at cost      
Land and improvements $ 8.3   $ 8.3
Buildings and improvements 102.4   102.1
Data processing equipment 191.4   190.9
Software 402.3   391.8
Furniture, fixtures, and equipment 140.1   145.6
Leasehold improvements 108.7   106.2
Construction in progress 27.0   28.5
Total property and equipment, gross 980.2   973.4
Less: Accumulated depreciation 630.1   619.5
Property and equipment, net of accumulated depreciation 350.1   $ 353.9
Property and Equipment, Net of Accumulated Depreciation (Textual)      
Depreciation expense $ 24.0 $ 22.7