Quarterly report pursuant to Section 13 or 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
Feb. 29, 2020
May 31, 2019
Intangible Assets [Line Items]    
Total intangible assets, gross $ 640.0 $ 631.2
Less: Accumulated amortization 292.0 232.1
Intangible assets, net of accumulated amortization 348.0 399.1
Other Intangible Assets [Member]    
Intangible Assets [Line Items]    
Total intangible assets, gross 23.2 23.0
Client Lists [Member]    
Intangible Assets [Line Items]    
Total intangible assets, gross $ 616.8 $ 608.2