Annual report pursuant to Section 13 and 15(d)

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

v3.20.2
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 12 Months Ended
May 31, 2020
[1]
Feb. 29, 2020
[1]
Nov. 30, 2019
[1]
Aug. 31, 2019
[1]
May 31, 2019
[1]
Feb. 28, 2019
[1]
Nov. 30, 2018
[1]
Aug. 31, 2018
[1]
May 31, 2020
May 31, 2019
May 31, 2018
Funds Held for Clients and Corporate Investments [Abstract]                      
Gross realized gains                 $ 11.6 $ 0.6 $ 0.3
Gross realized losses                 (0.3) $ (0.6) (0.2)
Net realized gains $ 8.9 $ 0.6 $ 0.9 $ 0.9 $ 0.1 $ 0.1 $ (0.3) $ 0.1 $ 11.3 [1]   $ 0.1
[1] Total net realized gains/(losses) on the combined funds held for clients and corporate investment portfolios.