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Employee Benefit Plans - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 31, 2025 | May 31, 2024 | May 31, 2023
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 | $ 0.1
Defined benefit plans tax expense recognized in AOCI | 1.8 | 2.0 | 2.2
Estimated employer contributions in 2015 | 0.8 |  |
Contribution to retirement plan | 8.4 | 8.7 | 8.1
Annuities | Level 3 |  |  |
Employee Benefit Plans (Details) [Line Items] |  |  |
Fair value of annuities | 3.1 | 3.2 |
United States | Other Postretirement Benefits |  |  |
Employee Benefit Plans (Details) [Line Items] |  |  |
Reduction in benefit obligation | $ 6.5 | $ 7.2 | $ 8.0
Expected long-term return on plan assets | 0.00% | 0.00% | 0.00%

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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (j)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-8 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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