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Goodwill and Other Intangible Assets, Net - Intangible assets (Details) - USD ($)
$ in Millions
 12 Months Ended
May 31, 2025
May 31, 2024
May 31, 2023
Amortizable intangible assets:      
Gross carrying amount $ 241.9 $ 241.5  
Intangible assets, accumulated amortization (29.5) (13.3)  
Unamortized balance of the license 212.4 228.2  
Unamortized intangible assets:      
Unamortized intangible assets, Gross 249.1 248.7  
Intangible assets, net 219.6 235.4  
Amortization expense $ 16.2 7.3 $ 1.3
Minimum      
Unamortized intangible assets:      
Useful life 12 years    
Maximum      
Unamortized intangible assets:      
Useful life 20 years    
Trademarks      
Unamortized intangible assets:      
Unamortized intangible assets, Gross $ 7.2 7.2  
Intangible assets, net 7.2 7.2  
Customer relationships      
Amortizable intangible assets:      
Gross carrying amount 136.6 136.2  
Intangible assets, accumulated amortization (21.9) (11.0)  
Unamortized balance of the license 114.7 125.2  
Developed technology      
Amortizable intangible assets:      
Gross carrying amount 105.3 105.3  
Intangible assets, accumulated amortization (7.6) (2.3)  
Unamortized balance of the license $ 97.7 $ 103.0