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, 2013
Nov. 30, 2012
Nov. 30, 2013
Nov. 30, 2012
May 31, 2013
Components of property and equipment, at cost          
Land and improvements $ 8.1   $ 8.1   $ 8.1
Buildings and improvements 100.6   100.6   99.2
Data processing equipment 177.6   177.6   175.6
Software 326.8   326.8   290.1
Furniture, fixtures, and equipment 145.5   145.5   145.2
Leasehold improvements 101.3   101.3   99.5
Construction in progress 18.3   18.3   32.8
Total property and equipment, gross 878.2   878.2   850.5
Less: Accumulated depreciation and amortization 526.8   526.8   504.5
Property and equipment, net of accumulated depreciation 351.4   351.4   346.0
Property and Equipment, Net of Accumulated Depreciation (Textual)          
Depreciation expense $ 22.2 $ 19.5 $ 42.9 $ 38.9