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Goodwill and Other Intangibles (Details) - Schedule of other intangible assets subject to amortization - USD ($)
$ in Millions
 12 Months Ended
May 31, 2016
May 31, 2015
May 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]      
Other intangibles subject to amortization - beginning balance   $ 4.7 $ 5.8
Additions due to acquisition $ 2.4 0.8  
Amortization expense (2.2) (1.9) $ (2.0)
Foreign currency translation (0.2) 0.0  
Total other intangibles subject to amortization, net accumulated amortization of $19.5 and $17.3, respectively 4.7 4.7  
Accumulated amortization 19.5 17.3  
Total other intangibles not subject to amortization 2.1 2.1  
Total other intangibles $ 6.8 $ 6.8