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Taxes - Income taxes paid (Details) - USD ($) $ in Millions	12 Months Ended
Taxes - Income taxes paid (Details) - USD ($) $ in Millions	May 31, 2026	May 31, 2025	May 31, 2024
Effective Income Tax Rate Reconciliation [Line Items]
Federal	$ 30.7
Other foreign jurisdictions	2.7
Cash paid for income taxes, net of refunds	43.4	$ 2.0	$ 23.7
New York
Effective Income Tax Rate Reconciliation [Line Items]
State	2.5
Other
Effective Income Tax Rate Reconciliation [Line Items]
State	$ 7.5