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Stock-Based Compensation Plans (LTIP Performance-Based Stock Option Activity) (Details) - LTIP Performance-Based Stock Options [Member]
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
May 31, 2023
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding, Beginning balance, Shares subject to options | shares 0.4
Exercised, Shares subject to options | shares (0.0)
Outstanding, Ending balance, Shares subject to options | shares 0.4
Exercisable, Shares subject to options | shares 0.4
Outstanding, Beginning balance, Weighted-average exercise price per share | $ / shares $ 60.52
Exercised, Weighted-average exercise price per share | $ / shares 60.84
Outstanding, Ending balance, Weighted-average exercise price per share | $ / shares 60.51
Exercisable, Weighted-average exercise price per share | $ / shares $ 60.51
Outstanding, Weighted-average remaining contractual term (years) 3 years 1 month 6 days
Exercisable, Weighted-average remaining contractual term (years) 3 years 1 month 6 days
Outstanding, Aggregate intrinsic value | $ $ 19.4 [1]
Exercisable, Aggregate intrinsic value | $ $ 19.4 [1]
[1] Shares valued at the market price of the underlying stock as of May 31, 2023 less the exercise price.