Quarterly report [Sections 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
Aug. 31, 2025
May 31, 2025
Funds Held for Clients and Corporate Investments [Abstract]    
Funds held for clients $ 4,927.4 $ 4,813.3
Corporate investments 861.9 34.5
Total funds held for clients and corporate investments, Fair value $ 5,789.3 $ 4,847.8