Taxes (Details) - Schedule of provision for income taxes - USD ($) $ in Millions	12 Months Ended
May 31, 2021	May 31, 2020	May 31, 2019
Current
Federal	$ 2.3	$ (72.2)	$ (0.2)
State and local	(0.3)	(1.2)	4.8
Non-United States	6.0	2.1	2.8
Total Current	8.0	(71.3)	7.4
Deferred Income Taxes and Tax Credits [Abstract]
Federal	(10.9)	27.3	1.1
State and local	(1.3)	(0.9)	3.1
Non-United States	(3.1)	(1.1)	(1.2)
Total Deferred	(15.3)	25.3	3.0
Total provision (benefit) for income taxes	$ (7.3)	$ (46.0)	$ 10.4

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