Quarterly report pursuant to Section 13 or 15(d)

Funds Held for Clients and Corporate Investments (Classification of Investments on Consolidated Balance Sheets) (Details)

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Funds Held for Clients and Corporate Investments (Classification of Investments on Consolidated Balance Sheets) (Details) - USD ($)
$ in Millions
Nov. 30, 2021
May 31, 2021
Funds Held for Clients and Corporate Investments [Abstract]    
Funds held for clients $ 3,874.6 $ 3,750.0
Corporate investments 376.0 36.7
Long-term corporate investments 7.0 7.1
Total funds held for clients and corporate investments, Fair value $ 4,257.6 $ 3,793.8