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. 29, 2024
May 31, 2023
Funds Held for Clients and Corporate Investments [Abstract]    
Funds held for clients $ 6,079.5 $ 4,118.8
Corporate investments 36.6 373.4
Long-term corporate investments 1.6 3.8
Total funds held for clients and corporate investments, Fair value $ 6,117.7 $ 4,496.0