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 6 Months Ended
Nov. 30, 2015
Nov. 30, 2014
Nov. 30, 2015
Nov. 30, 2014
Basic earnings per share:        
Net income $ 189.2 $ 173.0 $ 398.3 $ 344.3
Weighted-average common shares outstanding 360.7 363.0 360.9 363.1
Basic earnings per share $ 0.52 $ 0.48 $ 1.10 $ 0.95
Diluted earnings per share:        
Net income $ 189.2 $ 173.0 $ 398.3 $ 344.3
Weighted-average common shares outstanding 360.7 363.0 360.9 363.1
Dilutive effect of common share equivalents 1.6 1.6 1.7 1.5
Weighted-average common shares outstanding, assuming dilution 362.3 364.6 362.6 364.6
Diluted earnings per share $ 0.52 $ 0.47 $ 1.10 $ 0.94
Weighted-average anti-dilutive common share equivalents 0.8 0.8 0.6 0.6