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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, 2022 | May 31, 2021
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Defined Benefit Plan Disclosure [Line Items] |  |
Projected benefit obligations | $ 31.9 | $ 47.0
Accumulated benefit obligations | 31.6 | 46.5
Fair value of plan assets | $ 30.4 | $ 40.8

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