Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2024	May 31, 2023	May 31, 2022	May 31, 2021
Loss Contingencies [Line Items]
Tax adjustments, settlements, and unusual provisions	$ 0.0
Deferred tax liabilities, net	84.9	$ 82.6
Deferred tax assets, net	23.1	21.0
Operating loss carryforwards, valuation allowance	3.2
Unrecognized tax benefits	1.8	2.0	$ 3.1	$ 12.3
Income tax penalties and interest accrued	0.3	0.1	0.3
Unrecognized tax benefits that would impact effective tax rate	1.8	2.0	3.1
Tax (expense) benefit from income tax penalties and interest expense	0.1	0.1	$ 2.3
Valuation allowance, deferred tax asset, increase (decrease), amount	1.8	5.0
Sales Tax
Loss Contingencies [Line Items]
Tax adjustments, settlements, and unusual provisions		$ 1.8
State and Local Jurisdiction
Loss Contingencies [Line Items]
Operating loss carryforwards, valuation allowance	5.7
Non-United States
Loss Contingencies [Line Items]
Operating loss carryforwards, valuation allowance	$ 21.2