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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, 2025
May 31, 2024
May 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]      
Other intangibles subject to amortization - beginning balance   $ 8.2 $ 7.8
Additions $ 85.3 6.0  
Amortization expense (11.2) (2.6) $ (2.2)
Foreign currency translation 3.5 0.1  
Impairments 0.0 (3.1)  
Total other intangibles subject to amortization, net of accumulated amortization of $50.3 and $39.1, respectively 85.8 8.2  
Total other intangibles not subject to amortization 2.1 2.1  
Total other intangibles 87.9 10.3  
Accumulated amortization $ 50.3 $ 39.1