Annual report pursuant to Section 13 and 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
May 31, 2024
May 31, 2023
Funds Held for Clients and Corporate Investments [Abstract]    
Due in one year or less, Amortized cost $ 211.0  
Due after one year through three years, Amortized cost 1,439.4  
Due after three years through five years, Amortized cost 1,452.8  
Due after five years, Amortized cost 388.9  
AFS securities, Amortized cost 3,492.1 $ 3,779.9
Due in one year or less, Fair value 207.1  
Due after one year through three years, Fair value 1,365.2  
Due after three years through five years, Fair value 1,377.2  
Due after five years, Fair value 380.1  
AFS securities, Fair value $ 3,329.6 $ 3,604.6