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 $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Feb. 28, 2013
Feb. 29, 2012
Feb. 28, 2013
Feb. 29, 2012
Basic earnings per share:        
Net income $ 144.5 $ 135.4 $ 445.5 $ 424.7
Weighted-average common shares outstanding 363.8 362.5 363.5 362.4
Basic earnings per share $ 0.40 $ 0.37 $ 1.23 $ 1.17
Diluted earnings per share:        
Net income $ 144.5 $ 135.4 $ 445.5 $ 424.7
Weighted-average common shares outstanding 363.8 362.5 363.5 362.4
Dilutive effect of common share equivalents at average market price 0.8 0.6 0.7 0.5
Weighted-average common shares outstanding, assuming dilution 364.6 363.1 364.2 362.9
Diluted earnings per share $ 0.40 $ 0.37 $ 1.22 $ 1.17
Weighted-average anti-dilutive common share equivalents 7.0 8.9 7.3 10.3