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Employee Benefit Plans - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
May 31, 2023 | May 31, 2022 | May 31, 2021 | Nov. 30, 2020
Employee Benefit Plans (Details) [Line Items] |  |  |  |
Reduction in benefit obligation |  |  |  | $ 7.6
Amount recognized in Accumulated comprehensive income (loss) net of tax |  |  |  | $ 7.6
Remaining life of plan |  |  | 12 years |
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 | $ 0.2 | $ 0.2 |
Defined benefit plans tax expense recognized in AOCI | 2.2 | 2.2 | 2.0 |
Estimated employer contributions in 2015 | 1.2 |  |  |
Contribution to retirement plan | 8.1 | 7.2 | 6.0 |
Annuities | Level 3 |  |  |  |
Employee Benefit Plans (Details) [Line Items] |  |  |  |
Fair value of annuities | 3.3 | 4.2 |  |
U.S. | Other Postretirement Benefits |  |  |  |
Employee Benefit Plans (Details) [Line Items] |  |  |  |
Reduction in benefit obligation | $ 8.0 | $ 9.4 | $ 12.1 |
Expected long-term return on plan assets | 0.00% | 0.00% | 0.00% |

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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (i-k) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-10A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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