Stock-Based Compensation Plans (Performance-Based RSUs and RSAs Activity) (Details) - $ / shares shares in Millions	12 Months Ended
May 31, 2026	May 31, 2025	May 31, 2024
Performance-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested, Beginning balance	0.3
Granted	0.1
Vested	(0.1)
Forfeited	0.0
Nonvested, Ending balance	0.3	0.3
Performance-Based RSAs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested, Beginning balance	0.0
Granted	0.0
Vested	0.0
Forfeited	0.0
Nonvested, Ending balance	0.0	0.0
Performance-Based RSUs and RSAs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested, Beginning balance	0.3
Granted	0.1
Vested	(0.1)
Forfeited	0.0
Nonvested, Ending balance	0.3	0.3
Nonvested, Beginning balance, Weighted-average grant-date fair value per share	$ 118.49
Granted, Weighted-average grant-date fair value per share	139.40	$ 125.17	$ 114.23
Vested, Weighted-average grant-date fair value per share	108.26
Forfeited, Weighted-average grant-date fair value per share	130.10
Nonvested, Ending balance, Weighted-average grant-date fair value per share	$ 128.64	$ 118.49

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

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- Definition

Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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- Definition

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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