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Goodwill and Intangible Assets, Net of Accumulated Amortization (Components of Intangible Assets, at Cost) (Details) - USD ($)
$ in Millions
May 31, 2025
May 31, 2024
Intangible Assets [Line Items]    
Total intangible assets, gross $ 2,523.1 $ 698.2
Less: Accumulated amortization 575.8 503.7
Intangible assets, net of accumulated amortization 1,947.3 194.5
Other Intangible Assets [Member]    
Intangible Assets [Line Items]    
Total intangible assets, gross 314.7 23.1
Client Lists [Member]    
Intangible Assets [Line Items]    
Total intangible assets, gross 1,797.9 $ 675.1
Acquired Developed Software [Member]    
Intangible Assets [Line Items]    
Total intangible assets, gross $ 410.5