Quarterly report pursuant to Section 13 or 15(d)

Basic and Diluted Earnings Per Share (Details)

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Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Feb. 29, 2016
Feb. 28, 2015
Feb. 29, 2016
Feb. 28, 2015
Basic earnings per share:        
Net income $ 180.4 $ 169.4 $ 578.7 $ 513.7
Weighted-average common shares outstanding 360.5 363.2 360.8 363.1
Basic earnings per share $ 0.50 $ 0.47 $ 1.60 $ 1.41
Diluted earnings per share:        
Net income $ 180.4 $ 169.4 $ 578.7 $ 513.7
Weighted-average common shares outstanding 360.5 363.2 360.8 363.1
Dilutive effect of common share equivalents 1.7 1.8 1.6 1.7
Weighted-average common shares outstanding, assuming dilution 362.2 365.0 362.4 364.8
Diluted earnings per share $ 0.50 $ 0.46 $ 1.60 $ 1.41
Weighted-average anti-dilutive common share equivalents 0.7 0.0 0.7 0.4