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Employee Benefit Plans (Details) - Schedule of recognized in accumulated other comprehensive loss - USD ($) $ in Millions | May 31, 2020 | May 31, 2019
--- | --- | ---
Pension and postretirement adjustments: |  |
Net actuarial gain (loss) | $ (8.3) | $ (12.5)
Amount recognized in Accumulated comprehensive income (loss) before tax | 8.4 | 13.0
Other Postretirement Benefits [Member] |  |
Pension and postretirement adjustments: |  |
Net actuarial gain (loss) | 1.3 | 0.5
Amount recognized in Accumulated comprehensive income (loss) before tax | (1.2) | (0.0)
U.K. [Member] | Pension Plans [Member] |  |
Pension and postretirement adjustments: |  |
Net actuarial gain (loss) | (9.6) | (13.0)
Amount recognized in Accumulated comprehensive income (loss) before tax | $ 9.6 | $ 13.0

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