Leases - Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2022	May 31, 2021	May 31, 2020
Leases [Abstract]
Operating cash flows from operating leases	$ 31.4	$ 27.4	$ 25.4
Operating cash flows from finance leases	0.4	0.4	0.4
Financing cash flows from finance leases	$ 2.3	$ 2.3	$ 2.0