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
3 Months Ended
Aug. 31, 2011
Aug. 31, 2010
Basic earnings per share:    
Net income $ 148.9 $ 131.9
Weighted-average common shares outstanding 362.2 361.6
Basic earnings per share $ 0.41 $ 0.36
Diluted earnings per share:    
Net income $ 148.9 $ 131.9
Weighted-average common shares outstanding 362.2 361.6
Dilutive effect of common share equivalents at average market price 0.6 0.4
Weighted-average common shares outstanding, assuming dilution 362.8 362.0
Diluted earnings per share $ 0.41 $ 0.36
Weighted-average anti-dilutive common share equivalents 12.6 14.2