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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, 2017
May 31, 2016
May 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]      
Other intangibles subject to amortization - beginning balance   $ 4.7 $ 4.7
Additions $ 7.0 2.4  
Amortization expense (2.5) (2.2) $ (1.9)
Foreign currency translation (0.2) (0.2)  
Total other intangibles subject to amortization, net of accumulated amortization of $22.0 and $19.5, respectively 9.0 4.7  
Accumulated amortization 22.0 19.5  
Total other intangibles not subject to amortization 2.1 2.1  
Total other intangibles $ 11.1 $ 6.8