Goodwill and Other Intangibles (Details) - Schedule of other intangible assets subject to amortization - USD ($) $ in Millions	12 Months Ended
	May 31, 2018	May 31, 2017	May 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Other intangibles subject to amortization - beginning balance		$ 9.0	$ 4.7
Additions	$ 3.3	7.0
Amortization expense	(2.1)	(2.5)	$ (2.2)
Foreign currency translation	(0.1)	(0.2)
Total other intangibles subject to amortization, net of accumulated amortization of $24.1 and $22.0, respectively	10.1	9.0
Accumulated amortization	24.1	22.0
Total other intangibles not subject to amortization	2.1	2.1
Total other intangibles	$ 12.2	$ 11.1