Fair Value Measurements (Schedule of Amortized Cost and Fair Value of Borrowings) (Details) - USD ($) $ in Millions	Aug. 31, 2026	May 31, 2026
Debt Instrument [Line Items]
Long-term borrowings, Amortized cost	$ 4,558.0	$ 4,556.1
Long-term borrowings, Fair value	4,544.5	4,600.8
Senior Notes, Series B [Member]
Debt Instrument [Line Items]
Long-term borrowings, Amortized cost	399.5	399.5
Long-term borrowings, Fair value	394.3	397.4
5-Year Fixed Rate Bonds [Member]
Debt Instrument [Line Items]
Long-term borrowings, Amortized cost	1,488.7	1,487.9
Long-term borrowings, Fair value	1,489.3	1,504.9
7-Year Fixed Rate Bonds [Member]
Debt Instrument [Line Items]
Long-term borrowings, Amortized cost	1,485.8	1,485.2
Long-term borrowings, Fair value	1,485.4	1,504.3
10-Year Fixed Rate Bonds [Member]
Debt Instrument [Line Items]
Long-term borrowings, Amortized cost	1,184.0	1,183.5
Long-term borrowings, Fair value	$ 1,175.5	$ 1,194.2

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

+ References

+ Details

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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