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
Feb. 28, 2022
May 31, 2021
Funds Held for Clients and Corporate Investments [Abstract]    
Funds held for clients $ 4,304.1 $ 3,750.0
Corporate investments 1,086.0 36.7
Long-term corporate investments 5.1 7.1
Total funds held for clients and corporate investments, Fair value $ 5,395.2 $ 3,793.8