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Basic and Diluted Earnings Per Share (Details) (USD $) In Millions, except Per Share data | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2011 | Feb. 28, 2011 | Nov. 30, 2010 | Aug. 31, 2010 | May 31, 2010 | Feb. 28, 2010 | Nov. 30, 2009 | Aug. 31, 2009 | May 31, 2011 | May 31, 2010 | May 31, 2009
Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |
Net income | $ 118.9 | $ 130.6 | $ 133.9 | $ 131.9 | $ 115.5 | $ 112.0 | $ 125.9 | $ 123.6 | $ 515.3 | $ 477.0 | $ 533.5
Weighted-average common shares outstanding | 362.0 | 361.8 | 361.7 | 361.6 | 361.5 | 361.4 | 361.4 | 361.2 | 361.8 | 361.4 | 360.8
Basic earnings per share | $ 0.33 | $ 0.36 | $ 0.37 | $ 0.36 | $ 0.32 | $ 0.31 | $ 0.35 | $ 0.34 | $ 1.42 | $ 1.32 | $ 1.48
Diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |
Net income | $ 118.9 | $ 130.6 | $ 133.9 | $ 131.9 | $ 115.5 | $ 112.0 | $ 125.9 | $ 123.6 | $ 515.3 | $ 477.0 | $ 533.5
Weighted-average common shares outstanding | 362.0 | 361.8 | 361.7 | 361.6 | 361.5 | 361.4 | 361.4 | 361.2 | 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 | 363.0 | 362.6 | 362.1 | 362.0 | 362.0 | 361.9 | 361.7 | 361.4 | 362.4 | 361.7 | 361.0
Diluted earnings per share | $ 0.33 | $ 0.36 | $ 0.37 | $ 0.36 | $ 0.32 | $ 0.31 | $ 0.35 | $ 0.34 | $ 1.42 | $ 1.32 | $ 1.48
Weighted-average anti-dilutive common share equivalents |  |  |  |  |  |  |  |  | 11.5 | 13.0 | 13.5

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 13, 14 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 171 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph c + Details
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- Definition The amount of net income or loss for the period per each share of common stock outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 36, 37, 38 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 + Details
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- Definition The amount of net income or loss for the period per each share of common stock and dilutive common stock equivalents outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 11, 12, 36 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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- Definition The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph d Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A7 -Appendix A Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 10, 15 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28, 29, 30 + Details
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