Stock-Based Compensation Plans (Other Information Pertaining to Stock Option) (Details) - Stock Options [Member] - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
May 31, 2026	May 31, 2025	May 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair value per share of stock options granted	$ 33.5	$ 27.54	$ 27.21
Total intrinsic value of stock options exercised	$ 37.8	$ 42.0	$ 40.3

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