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Basic and Diluted Earnings Per Share (Basic and Diluted Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Aug. 31, 2024
Aug. 31, 2023
Basic earnings per share:    
Net income $ 427.4 $ 419.2
Weighted-average common shares outstanding 360.1 360.8
Basic earnings per share $ 1.19 $ 1.16
Diluted earnings per share:    
Net income $ 427.4 $ 419.2
Weighted-average common shares outstanding 360.1 360.8
Dilutive effect of common share equivalents 1.8 2.0
Weighted-average common shares outstanding, assuming dilution 361.9 362.8
Diluted earnings per share $ 1.18 $ 1.16
Weighted-average anti-dilutive common share equivalents 0.6 0.6