Leases - Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2024	May 31, 2023	May 31, 2022
Leases [Abstract]
Operating cash flows from operating leases	$ 30.2	$ 25.9	$ 31.4
Operating cash flows from finance leases	0.3	0.3	0.4
Financing cash flows from finance leases	2.3	2.3	2.3
Lease assets obtained in exchange for new lease liabilities	$ 40.4	$ 27.4	$ 31.8