RETIREMENT BENEFITS AND POSTEMPLOYMENT BENEFITS - Schedule of Estimated Benefit Payments (Details) $ in Millions	May 31, 2026 USD ($)
Defined Benefit Pension Plans
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
Fiscal 2027	$ 372.6
Fiscal 2028	377.2
Fiscal 2029	381.6
Fiscal 2030	385.4
Fiscal 2031	389.2
Fiscal 2032 - 2036	1,969.5
Other Postretirement Benefit Plans
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
Fiscal 2027	30.9
Fiscal 2028	30.0
Fiscal 2029	29.2
Fiscal 2030	28.6
Fiscal 2031	27.4
Fiscal 2032 - 2036	125.3
Postemployment Benefit Plans
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
Fiscal 2027	21.6
Fiscal 2028	18.1
Fiscal 2029	16.2
Fiscal 2030	14.7
Fiscal 2031	13.6
Fiscal 2032 - 2036	$ 58.5

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- Definition

Amount of benefit for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (e)
-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 1
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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- Definition

Amount of benefit for defined benefit plan expected to be paid in next fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in fifth fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in fourth fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in third fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in second fiscal year following current fiscal year.

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