Annual report pursuant to Section 13 and 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
May 31, 2022
May 31, 2021
Funds Held for Clients and Corporate Investments [Abstract]    
Funds held for clients $ 3,682.9 $ 3,750.0
Corporate investments 853.9 36.7
Long-term corporate investments 5.0 7.1
Total funds held for clients and corporate investments, Fair value $ 4,541.8 $ 3,793.8