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)

v3.20.2
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, 2020
May 31, 2020
Funds Held for Clients and Corporate Investments [Abstract]    
Due in one year or less, Amortized cost $ 347.8  
Due after one year through three years, Amortized cost 680.7  
Due after three years through five years, Amortized cost 836.1  
Due after five years, Amortized cost 998.6  
Available-for-sale securities, Amortized cost 2,863.2 $ 2,657.2
Due in one year or less, Fair value 351.0  
Due after one year through three years, Fair value 705.1  
Due after three years through five years, Fair value 881.0  
Due after five years, Fair value 1,043.0  
Available-for-sale securities, Fair value $ 2,980.1 $ 2,757.2