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Basic and Diluted Earnings Per Share (Tables) | 12 Months Ended
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May 31, 2011
Basic and Diluted Earnings Per Share (Tables) [Abstract] |
Basic and diluted earnings per share |
|  | Year ended May 31, |
In millions, except per share amounts |  | 2011 |  |  | 2010 |  |  | 2009 |
Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 515.3 |  |  | $ | 477.0 |  |  | $ | 533.5 |
Weighted-average common shares outstanding |  |  | 361.8 |  |  |  | 361.4 |  |  |  | 360.8 |
Basic earnings per share |  | $ | 1.42 |  |  | $ | 1.32 |  |  | $ | 1.48 |
Diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 515.3 |  |  | $ | 477.0 |  |  | $ | 533.5 |
Weighted-average common shares outstanding |  |  | 361.8 |  |  |  | 361.4 |  |  |  | 360.8 |
Dilutive effect of common share equivalents at average market price |  |  | 0.6 |  |  |  | 0.3 |  |  |  | 0.2 |
Weighted-average common shares outstanding, assuming dilution |  |  | 362.4 |  |  |  | 361.7 |  |  |  | 361.0 |
Diluted earnings per share |  | $ | 1.42 |  |  | $ | 1.32 |  |  | $ | 1.48 |
Weighted-average anti-dilutive common share equivalents |  |  | 11.5 |  |  |  | 13.0 |  |  |  | 13.5 |

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