Taxes - Schedule of provision for income taxes (Details) - USD ($) $ in Millions	12 Months Ended
May 31, 2023	May 31, 2022	May 31, 2021
Current
Federal	$ 26.4	$ (2.1)	$ 2.3
State and local	1.6	0.6	(0.3)
Non-United States	1.6	3.0	6.0
Total Current	29.6	1.5	8.0
Deferred Income Taxes and Tax Credits [Abstract]
Federal	(6.6)	6.1	(10.9)
State and local	3.9	2.4	(1.3)
Non-United States	(1.0)	(1.3)	(3.1)
Total Deferred	(3.7)	7.2	(15.3)
Total provision (benefit) for income taxes	$ 25.9	$ 8.7	$ (7.3)

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