Quarterly report pursuant to Section 13 or 15(d)

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

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Funds Held for Clients and Corporate Investments (Realized Gains and Losses from Sale of Available-for-sale Securities) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Nov. 30, 2020
Nov. 30, 2019
Nov. 30, 2020
Nov. 30, 2019
Funds Held for Clients and Corporate Investments [Abstract]        
Gross realized gains $ 0.4 $ 0.9 $ 0.7 $ 1.8
Gross realized losses
Net realized gains $ 0.4 $ 0.9 $ 0.7 $ 1.8