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 6 Months Ended
Nov. 30, 2015
Nov. 30, 2014
Nov. 30, 2015
Nov. 30, 2014
May. 31, 2015
Components of property and equipment, at cost          
Land and improvements $ 8.3   $ 8.3   $ 8.3
Buildings and improvements 102.4   102.4   102.1
Data processing equipment 190.5   190.5   190.9
Software 425.1   425.1   391.8
Furniture, fixtures, and equipment 133.8   133.8   145.6
Leasehold improvements 106.7   106.7   106.2
Construction in progress 18.3   18.3   28.5
Total property and equipment, gross 985.1   985.1   973.4
Less: Accumulated depreciation 632.4   632.4   619.5
Property and equipment, net of accumulated depreciation 352.7   352.7   $ 353.9
Property and Equipment, Net of Accumulated Depreciation (Textual)          
Depreciation expense $ 24.7 $ 22.5 $ 48.7 $ 45.2