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Funds Held for Clients and Corporate Investments (Amortized Cost and Fair Value of Available-for-Sale Securities by Contractual Maturity) (Details) - USD ($)
$ in Millions
Aug. 31, 2022
May 31, 2022
Funds Held for Clients and Corporate Investments [Abstract]    
Due in one year or less, Amortized cost $ 289.4  
Due after one year through three years, Amortized cost 746.9  
Due after three years through five years, Amortized cost 1,421.1  
Due after five years, Amortized cost 443.0  
AFS securities, Amortized cost 2,900.4 $ 4,165.5
Due in one year or less, Fair value 288.4  
Due after one year through three years, Fair value 728.0  
Due after three years through five years, Fair value 1,312.3  
Due after five years, Fair value 396.1  
AFS securities, Fair value $ 2,724.8 $ 4,029.2