Other Expense, Net (Schedule of Other Expense, Net) (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2022	May 31, 2021	May 31, 2020
Other Income and Expenses [Abstract]
Interest income on corporate investments	$ 2.9	$ 2.3	$ 12.3
Interest expense	(36.6)	(35.8)	(38.8)
Other	18.3	7.0	3.1
Other expense, net	$ (15.4)	$ (26.5)	$ (23.4)