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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- Definition

Other Comprehensive Income Defined Benefit Plans Tax Expense Benefit

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- Definition

Percentage of federal subsidy to sponsors of retiree health care benefit plans.

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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.

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year.

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Amount of decrease in accumulated postretirement benefit obligation for government subsidy related to prescription drug benefits attributed to past service.

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Amount of discretionary contributions made by an employer to a defined contribution plan.

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