Summary of Significant Accounting Policies - Restructuring and Other Exit Costs, Supplemental Information on Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2023	May 31, 2022	May 31, 2021
Supplemental information on cash flows
Interest paid	$ 11.1	$ 2.1	$ 4.3
Income taxes paid	35.7	23.9	8.2
Income tax refunds	$ 1.3	$ 3.8	8.3
Cost of sales and services and Selling, general and administrative
Restructuring and other exit costs
Severance and furlough-related costs			$ 9.0