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Summary of Significant Accounting Policies - Property, Plant and Equipment and Supplemental Information on Cash Flows (Details) - USD ($)
$ in Millions
12 Months Ended
May 31, 2018
May 31, 2017
May 31, 2016
Supplemental Information on Cash Flows      
Interest paid $ 7.2 $ 4.4 $ 4.7
Income taxes paid 17.0 12.7 35.7
Income tax refunds and interest received $ 0.1 $ 1.3 $ 1.3
Building and improvements | Minimum      
Property, Plant and Equipment      
Useful life 10 years    
Building and improvements | Maximum      
Property, Plant and Equipment      
Useful life 40 years    
Equipment | Minimum      
Property, Plant and Equipment      
Useful life 3 years    
Equipment | Maximum      
Property, Plant and Equipment      
Useful life 10 years    
Furniture and fixtures | Minimum      
Property, Plant and Equipment      
Useful life 3 years    
Furniture and fixtures | Maximum      
Property, Plant and Equipment      
Useful life 10 years    
Capitalized software | Minimum      
Property, Plant and Equipment      
Useful life 3 years    
Capitalized software | Maximum      
Property, Plant and Equipment      
Useful life 10 years