Annual report pursuant to Section 13 and 15(d)

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

v3.7.0.1
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 12 Months Ended
May 31, 2017
Feb. 28, 2017
Nov. 30, 2016
Aug. 31, 2016
May 31, 2016
Feb. 29, 2016
Nov. 30, 2015
Aug. 31, 2015
May 31, 2017
May 31, 2016
May 31, 2015
Basic and Diluted Earnings Per Share [Abstract]                      
Net income $ 195.3 $ 202.5 $ 202.1 $ 217.4 $ 178.1 $ 180.4 $ 189.2 $ 209.1 $ 817.3 $ 756.8 $ 674.9
Basic earnings per share:                      
Weighted-average common shares outstanding 359.3 359.0 360.2 361.0 360.3 360.5 360.7 361.1 359.8 360.7 362.9
Basic earnings per share $ 0.54 [1] $ 0.56 [1] $ 0.56 [1] $ 0.60 [1] $ 0.49 [1] $ 0.50 [1] $ 0.52 [1] $ 0.58 [1] $ 2.27 [1] $ 2.10 [1] $ 1.86
Diluted earnings per share:                      
Dilutive effect of common share equivalents                 2.8 1.8 1.7
Weighted-average common shares outstanding, assuming dilution 362.1 361.8 362.6 364.1 362.6 362.2 362.3 362.8 362.6 362.5 364.6
Diluted earnings per share $ 0.54 [1] $ 0.56 [1] $ 0.56 [1] $ 0.60 [1] $ 0.49 [1] $ 0.50 [1] $ 0.52 [1] $ 0.58 [1] $ 2.25 [1] $ 2.09 [1] $ 1.85
Weighted-average anti-dilutive common share equivalents                 0.7 0.5 0.3
[1] Each quarter is a discrete period and the sum of the four quarters' basic and diluted earnings per share amounts may not equal the full year amount.