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Employee Benefit Plans - Schedule of accumulated benefit obligation in excess of plan assets (Details) - U.K. - Pension Plans - USD ($) $ in Millions	May 31, 2025	May 31, 2024
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligations	$ 25.3	$ 26.7
Accumulated benefit obligations	25.2	26.7
Fair value of plan assets	$ 20.1	$ 21.4

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