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Employee Benefit Plans - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 31, 2024 | May 31, 2023 | May 31, 2022
Employee Benefit Plans (Details) [Line Items] |  |  |
Percentage of federal subsidy to sponsors of retiree health care benefit plans | 28.00% |  |
Cumulative reduction of its accumulated post-retirement benefit obligation | $ 0.1 | $ 0.1 | $ 0.2
Defined benefit plans tax expense recognized in AOCI | 2.0 | 2.2 | 2.2
Estimated employer contributions in 2015 | 1.3 |  |
Contribution to retirement plan | 8.7 | 8.1 | 7.2
Annuities | Level 3 |  |  |
Employee Benefit Plans (Details) [Line Items] |  |  |
Fair value of annuities | 3.2 | 3.3 |
U.S. | Other Postretirement Benefits |  |  |
Employee Benefit Plans (Details) [Line Items] |  |  |
Reduction in benefit obligation | $ 7.2 | $ 8.0 | $ 9.4
Expected long-term return on plan assets | 0.00% | 0.00% | 0.00%

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