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Property, Plant and Equipment (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
May 31, 2016
May 31, 2016
May 31, 2015
May 31, 2014
Property, Plant and Equipment [Line Items]        
Total at cost $ 877.0 $ 877.0 $ 905.1  
Less: Accumulated depreciation and amortization (439.4) (439.4) (465.4)  
Property, plant and equipment, net 437.6 437.6 439.7  
Depreciation and amortization expense of property plant and equipment   36.7 46.0 $ 58.3
Asset impairments   14.4 15.8 $ 28.0
Land [Member]        
Property, Plant and Equipment [Line Items]        
Total at cost 77.4 77.4 77.2  
Building [Member]        
Property, Plant and Equipment [Line Items]        
Total at cost 240.4 240.4 241.0  
Capitalized software [Member]        
Property, Plant and Equipment [Line Items]        
Total at cost 196.0 196.0 204.9  
Furniture, fixtures and equipment [Member]        
Property, Plant and Equipment [Line Items]        
Total at cost 221.5 221.5 219.8  
Building and Leasehold improvements [Member]        
Property, Plant and Equipment [Line Items]        
Total at cost 141.7 $ 141.7 $ 162.2  
Legacy Building Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Asset impairments $ 7.5