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
Aug. 31, 2012
Aug. 31, 2011
Basic earnings per share:    
Net income $ 153.1 $ 148.9
Weighted-average common shares outstanding 363.0 362.2
Basic earnings per share $ 0.42 $ 0.41
Diluted earnings per share:    
Net income $ 153.1 $ 148.9
Weighted-average common shares outstanding 363.0 362.2
Dilutive effect of common share equivalents at average market price 0.8 0.6
Weighted-average common shares outstanding, assuming dilution 363.8 362.8
Diluted earnings per share $ 0.42 $ 0.41
Weighted-average anti-dilutive common share equivalents 7.4 12.6