Quarterly report pursuant to Section 13 or 15(d)

Basic and Diluted Earnings Per Share (Basic and Diluted Earnings Per Share) (Details)

v3.8.0.1
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, 2017
Aug. 31, 2016
Basic and Diluted Earnings Per Share [Abstract]    
Net income $ 227.8 $ 217.4
Basic earnings per share:    
Weighted-average common shares outstanding 358.9 361.0
Basic earnings per share $ 0.63 $ 0.60
Diluted earnings per share:    
Dilutive effect of common share equivalents 2.4 3.1
Weighted-average common shares outstanding, assuming dilution 361.3 364.1
Diluted earnings per share $ 0.63 $ 0.60
Weighted-average anti-dilutive common share equivalents 1.1 0.5