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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, 2021
May 31, 2020
May 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]      
Other intangibles subject to amortization - beginning balance   $ 10.5 $ 12.2
Intangible assets acquired $ 0.0 1.6  
Adjustments (0.5) 0.0  
Amortization expense (2.2) (3.2) $ (2.8)
Foreign currency translation 0.6 (0.1)  
Total other intangibles subject to amortization, net of accumulated amortization of $32.3 and $30.1, respectively 8.4 10.5  
Total other intangibles not subject to amortization 2.1 2.1  
Total other intangibles 10.5 12.6  
Accumulated amortization $ 32.3 $ 30.1