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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 6 Months Ended
Nov. 30, 2023
Nov. 30, 2022
Nov. 30, 2023
Nov. 30, 2022
Basic earnings per share:        
Net income $ 392.7 $ 360.3 $ 811.9 $ 739.5
Weighted-average common shares outstanding 360.5 360.5 360.6 360.2
Basic earnings per share $ 1.09 $ 1.00 $ 2.25 $ 2.05
Diluted earnings per share:        
Net income $ 392.7 $ 360.3 $ 811.9 $ 739.5
Weighted-average common shares outstanding 360.5 360.5 360.6 360.2
Dilutive effect of common share equivalents 1.6 1.8 1.8 2.1
Weighted-average common shares outstanding, assuming dilution 362.1 362.3 362.4 362.3
Diluted earnings per share $ 1.08 $ 0.99 $ 2.24 $ 2.04
Weighted-average anti-dilutive common share equivalents 0.8 0.9 0.7 0.7