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
Aug. 31, 2016
Aug. 31, 2015
May 31, 2016
Property, Plant and Equipment [Line Items]      
Total property and equipment, gross $ 1,018.1   $ 1,012.2
Less: Accumulated depreciation 669.7   659.2
Property and equipment, net of accumulated depreciation 348.4   353.0
Depreciation expense 25.3 $ 24.0  
Land and Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment, gross 8.3   8.3
Buildings and Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment, gross 103.1   103.0
Data Processing Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment, gross 197.4   196.1
Software [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment, gross 454.6   447.5
Furniture, Fixtures, and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment, gross 120.2   125.0
Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment, gross 110.4   108.2
Construction in Progress [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment, gross $ 24.1   $ 24.1