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 6 Months Ended
Nov. 30, 2011
Nov. 30, 2010
Nov. 30, 2011
Nov. 30, 2010
May 31, 2011
Components of property and equipment, at cost          
Land and improvements $ 6.9   $ 6.9   $ 7.0
Buildings and improvements 95.6   95.6   95.2
Data processing equipment 211.4   211.4   204.6
Software 248.6   248.6   231.2
Furniture, fixtures, and equipment 153.8   153.8   152.0
Leasehold improvements 96.4   96.4   93.3
Construction in progress 19.9   19.9   20.9
Total property and equipment, gross 832.6   832.6   804.2
Less: Accumulated depreciation and amortization 516.6   516.6   495.5
Property and equipment, net of accumulated depreciation 316.0   316.0   308.7
Property and Equipment, Net of Accumulated Depreciation (Textuals) [Abstract]          
Depreciation expense $ 18.4 $ 16.0 $ 36.9 $ 32.2