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, 2021
May 31, 2020
Intangible Assets [Line Items]    
Total intangible assets, gross $ 656.4 $ 641.7
Less: Accumulated amortization 380.6 311.1
Intangible assets, net of accumulated amortization 275.8 330.6
Other Intangible Assets [Member]    
Intangible Assets [Line Items]    
Total intangible assets, gross 24.1 23.3
Client Lists [Member]    
Intangible Assets [Line Items]    
Total intangible assets, gross $ 632.3 $ 618.4