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. 29, 2012
Feb. 28, 2011
Feb. 29, 2012
Feb. 28, 2011
Basic earnings per share:        
Net income $ 135.4 $ 130.6 $ 424.7 $ 396.4
Weighted-average common shares outstanding 362.5 361.8 362.4 361.7
Basic earnings per share $ 0.37 $ 0.36 $ 1.17 $ 1.10
Diluted earnings per share:        
Net income $ 135.4 $ 130.6 $ 424.7 $ 396.4
Weighted-average common shares outstanding 362.5 361.8 362.4 361.7
Dilutive effect of common share equivalents at average market price 0.6 0.8 0.5 0.5
Weighted-average common shares outstanding, assuming dilution 363.1 362.6 362.9 362.2
Diluted earnings per share $ 0.37 $ 0.36 $ 1.17 $ 1.09
Weighted-average anti-dilutive common share equivalents 8.9 9.4 10.3 12.3