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Goodwill and Other Intangibles - Schedule of other intangible assets subject to amortization (Details) - USD ($)
$ in Millions
 12 Months Ended
May 31, 2023
May 31, 2022
May 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]      
Other intangibles subject to amortization - beginning balance   $ 6.0 $ 8.4
Intangible assets acquired $ 4.1 0.0  
Amortization expense (2.2) (2.0) $ (2.2)
Foreign currency translation (0.1) (0.4)  
Total other intangibles subject to amortization, net of accumulated amortization of $36.5 and $34.3, respectively 7.8 6.0  
Total other intangibles not subject to amortization 2.1 2.1  
Total other intangibles 9.9 8.1  
Accumulated amortization $ 36.5 $ 34.3