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Funds Held for Clients and Corporate Investments (Classification of Investments on Consolidated Balance Sheets) (Details) - USD ($)
$ in Millions
May 31, 2024
May 31, 2023
Funds Held for Clients and Corporate Investments [Abstract]    
Funds held for clients $ 3,706.2 $ 4,118.8
Corporate investments 33.9 373.4
Long-term corporate investments 3.7 3.8
Total funds held for clients and corporate investments, Fair value $ 3,743.8 $ 4,496.0