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Earnings Per Common Share | 3 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Earnings Per Common Share | Earnings Per Common Share Basic earnings or loss per common share are computed by dividing net income by the weighted average number of common shares outstanding during the reporting period. Diluted earnings per common share are computed similar to basic earnings per common share except that it reflects the potential dilution that could occur if dilutive securities or other obligations to issue common stock were exercised or converted into common stock. Diluted loss per share for the first quarter of 2019 was calculated by excluding potentially dilutive securities from the denominator of the share computation due to their anti-dilutive effects. The computations for basic and diluted earnings or loss per common share are as follows:
| Quarter Ended June 30,
(In millions, except per share amounts) | 2018 |  | 2017
Income (loss) from continuing operations | $ | (81 | ) |  | $ | 363 |
Net income attributable to noncontrolling interests | (58 | ) |  | (56 | )
Income (loss) from continuing operations attributable to McKesson | (139 | ) |  | 307 |
Income from discontinued operations, net of tax | 1 |  |  | 2 |
Net income (loss) attributable to McKesson | $ | (138 | ) |  | $ | 309 |
Weighted average common shares outstanding: |  |  |
Basic | 202 |  |  | 211 |
Effect of dilutive securities: |  |  |
Options to purchase common stock | — |  |  | 1 |
Restricted stock units | — |  |  | 1 |
Diluted | 202 |  |  | 213 |
Earnings (loss) per common share attributable to McKesson: (1) |  |  |
Diluted |  |  |
Continuing operations | $ | (0.69 | ) |  | $ | 1.44 |
Discontinued operations | 0.01 |  |  | 0.01 |
Total | $ | (0.68 | ) |  | $ | 1.45 |
Basic |  |  |
Continuing operations | $ | (0.69 | ) |  | $ | 1.46 |
Discontinued operations | 0.01 |  |  | — |
Total | $ | (0.68 | ) |  | $ | 1.46 |
(1) | Certain computations may reflect rounding adjustments.
Potentially dilutive securities include outstanding stock options, restricted stock units, and performance-based and other restricted stock units. Approximately 2 million potentially dilutive securities were excluded from the computations of diluted net earnings per common share for the quarter ended June 30, 2017, as they were anti-dilutive.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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