Annual report pursuant to Section 13 and 15(d)

Goodwill and Intangible Assets, Net of Accumulated Amortization (Components of Intangible Assets, at Cost) (Details)

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Goodwill and Intangible Assets, Net of Accumulated Amortization (Components of Intangible Assets, at Cost) (Details) - USD ($)
$ in Millions
May 31, 2022
May 31, 2021
Intangible Assets [Line Items]    
Total intangible assets, gross $ 660.4 $ 656.4
Less: Accumulated amortization 435.8 380.6
Intangible assets, net of accumulated amortization 224.6 275.8
Other Intangible Assets [Member]    
Intangible Assets [Line Items]    
Total intangible assets, gross 23.0 24.1
Client Lists [Member]    
Intangible Assets [Line Items]    
Total intangible assets, gross $ 637.4 $ 632.3