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
Feb. 28, 2022
May 31, 2021
Funds Held for Clients and Corporate Investments [Abstract]    
Due in one year or less, Amortized cost $ 319.2  
Due after one year through three years, Amortized cost 682.2  
Due after three years through five years, Amortized cost 1,227.2  
Due after five years, Amortized cost 1,724.0  
AFS securities, Amortized cost 3,952.6 $ 2,940.9
Due in one year or less, Fair value 321.2  
Due after one year through three years, Fair value 690.2  
Due after three years through five years, Fair value 1,213.9  
Due after five years, Fair value 1,696.4  
AFS securities, Fair value $ 3,921.7 $ 3,020.2