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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, 2024
May 31, 2023
May 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]      
Other intangibles subject to amortization - beginning balance   $ 7.8 $ 6.0
Additions $ 6.0 4.1  
Amortization expense (2.6) (2.2) $ (2.0)
Foreign currency translation 0.1 (0.1)  
Impairments (3.1) 0.0  
Total other intangibles subject to amortization, net of accumulated amortization of $39.1 and $36.5, respectively 8.2 7.8  
Total other intangibles not subject to amortization 2.1 2.1  
Total other intangibles 10.3 9.9  
Accumulated amortization $ 39.1 $ 36.5