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Basic and Diluted Earnings Per Share | 9 Months Ended
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Feb. 29, 2016
Earnings Per Share [Abstract] |
Basic and Diluted Earnings Per Share | Basic and Diluted Earnings Per Share Basic and diluted earnings per share were calculated as follows:
| For the three months ended |  | For the nine months ended
In millions, except per share amounts | February 29, 2016 |  | February 28, 2015 |  | February 29, 2016 |  | February 28, 2015
Basic earnings per share: |  |  |  |  |  |  |
Net income | $ | 180.4 |  |  | $ | 169.4 |  |  | $ | 578.7 |  |  | $ | 513.7 |
Weighted-average common shares outstanding | 360.5 |  |  | 363.2 |  |  | 360.8 |  |  | 363.1 |
Basic earnings per share | $ | 0.50 |  |  | $ | 0.47 |  |  | $ | 1.60 |  |  | $ | 1.41 |
Diluted earnings per share: |  |  |  |  |  |  |
Net income | $ | 180.4 |  |  | $ | 169.4 |  |  | $ | 578.7 |  |  | $ | 513.7 |
Weighted-average common shares outstanding | 360.5 |  |  | 363.2 |  |  | 360.8 |  |  | 363.1 |
Dilutive effect of common share equivalents | 1.7 |  |  | 1.8 |  |  | 1.6 |  |  | 1.7 |
Weighted-average common shares outstanding, assuming dilution | 362.2 |  |  | 365.0 |  |  | 362.4 |  |  | 364.8 |
Diluted earnings per share | $ | 0.50 |  |  | $ | 0.46 |  |  | $ | 1.60 |  |  | $ | 1.41 |
Weighted-average anti-dilutive common share equivalents | 0.7 |  |  | — |  |  | 0.7 |  |  | 0.4 |
Weighted-average common share equivalents that have an anti-dilutive impact are excluded from the computation of diluted earnings per share. For the three months ended February 29, 2016 and February 28, 2015, 0.1 million and 0.5 million shares, respectively, of the Company’s common stock were issued in connection with the exercise or vesting of stock-based awards. For the nine months ended February 29, 2016 and February 28, 2015, 1.2 million and 1.9 million shares, respectively, of the Company’s common stock were issued in connection with the exercise or vesting of stock-based awards. In May 2014, the Board of Directors approved a program to repurchase up to $350 million of the Company's common stock, with authorization expiring on May 31, 2017. During the three and nine months ended February 29, 2016, the Company repurchased 0.9 million shares for $45.0 million and 2.2 million shares for $107.9 million, respectively. During the three and nine months ended February 28, 2015, the Company repurchased 0.4 million shares for $17.9 million and 1.7 million shares for $70.4 million, respectively. Shares repurchased were retired.

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