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, 2020
May 31, 2019
Funds Held for Clients and Corporate Investments [Abstract]    
Due in one year or less, Amortized cost $ 353.4  
Due after one year through three years, Amortized cost 700.9  
Due after three years through five years, Amortized cost 812.0  
Due after five years, Amortized cost 790.9  
Available-for-sale securities, Amortized cost 2,657.2 $ 3,601.1
Due in one year or less, Fair value 355.7  
Due after one year through three years, Fair value 723.5  
Due after three years through five years, Fair value 850.0  
Due after five years, Fair value 828.0  
Available-for-sale securities, Fair value $ 2,757.2 $ 3,620.8