Annual report [Section 13 and 15(d), not S-K Item 405]

Funds Held for Clients and Corporate Investments (Realized Gains and Losses from Sale of Available-for-sale Securities) (Details)

v3.25.2
Funds Held for Clients and Corporate Investments (Realized Gains and Losses from Sale of Available-for-sale Securities) (Details) - USD ($)
$ in Millions
12 Months Ended
May 31, 2025
May 31, 2024
May 31, 2023
Funds Held for Clients and Corporate Investments [Abstract]      
Gross realized gains $ 0.0 $ 0.0 $ 0.1
Gross realized losses (0.4) (2.6) (9.9)
Net realized (losses)/gains $ (0.4) $ (2.6) $ (9.8)