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. 28, 2013
Feb. 29, 2012
Feb. 28, 2013
Feb. 29, 2012
May 31, 2012
Components of property and equipment, at cost          
Land and improvements $ 8.1   $ 8.1   $ 7.0
Buildings and improvements 98.4   98.4   96.8
Data processing equipment 173.5   173.5   212.3
Software 282.6   282.6   263.5
Furniture, fixtures, and equipment 144.9   144.9   154.2
Leasehold improvements 98.5   98.5   96.0
Construction in progress 30.8   30.8   28.2
Total property and equipment, gross 836.8   836.8   858.0
Less: Accumulated depreciation and amortization 495.1   495.1   533.7
Property and equipment, net of accumulated depreciation 341.7   341.7   324.3
Property and Equipment, Net of Accumulated Depreciation (Textual)          
Depreciation expense $ 20.1 $ 18.8 $ 59.0 $ 55.7