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, unless otherwise specified
3 Months Ended 9 Months Ended
Feb. 29, 2012
Feb. 28, 2011
Feb. 29, 2012
Feb. 28, 2011
May 31, 2011
Components of property and equipment, at cost          
Land and improvements $ 7.0   $ 7.0   $ 7.0
Buildings and improvements 95.7   95.7   95.2
Data processing equipment 212.1   212.1   204.6
Software 254.2   254.2   231.2
Furniture, fixtures, and equipment 155.4   155.4   152.0
Leasehold improvements 97.9   97.9   93.3
Construction in progress 24.2   24.2   20.9
Total property and equipment, gross 846.5   846.5   804.2
Less: Accumulated depreciation and amortization 529.7   529.7   495.5
Property and equipment, net of accumulated depreciation 316.8   316.8   308.7
Property and Equipment, Net of Accumulated Depreciation (Textual) [Abstract]          
Depreciation expense $ 18.8 $ 17.4 $ 55.7 $ 49.6