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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, 2019
May 31, 2018
May 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]      
Other intangibles subject to amortization - beginning balance   $ 10.1 $ 9.0
Additions $ 4.5 3.3  
Other 0.6 0.0  
Amortization expense (2.8) (2.1) $ (2.5)
Foreign currency translation (0.2) (0.1)  
Total other intangibles subject to amortization, net of accumulated amortization of $26.9 and $24.1, respectively 12.2 10.1  
Accumulated amortization 26.9 24.1  
Total other intangibles not subject to amortization 2.1 2.1  
Total other intangibles $ 14.3 $ 12.2