Quarterly report pursuant to Section 13 or 15(d)

Funds Held for Clients and Corporate Investments (Amortized Cost and Fair Value of Available-for-Sale Securities by Contractual Maturity) (Details)

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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
Nov. 30, 2022
May 31, 2022
Funds Held for Clients and Corporate Investments [Abstract]    
Due in one year or less, Amortized cost $ 307.3  
Due after one year through three years, Amortized cost 845.5  
Due after three years through five years, Amortized cost 1,399.4  
Due after five years, Amortized cost 475.9  
AFS securities, Amortized cost 3,028.1 $ 4,165.5
Due in one year or less, Fair value 305.0  
Due after one year through three years, Fair value 809.7  
Due after three years through five years, Fair value 1,259.5  
Due after five years, Fair value 436.1  
AFS securities, Fair value $ 2,810.3 $ 4,029.2