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, 2021
May 31, 2020
Funds Held for Clients and Corporate Investments [Abstract]    
Funds held for clients $ 4,211.3 $ 3,430.5
Corporate investments 203.7 27.2
Long-term corporate investments 9.9 10.2
Total funds held for clients and corporate investments, Fair value $ 4,424.9 $ 3,467.9