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Earnings Per Common Share | 12 Months Ended
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Mar. 31, 2020
Earnings Per Share [Abstract] |
Earnings Per Common Share | Earnings per Common Share Basic earnings 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 the former reflects the potential dilution that could occur if dilutive securities or other obligations to issue common stock were exercised or converted into common stock. The computations for basic and diluted earnings per common share are as follows:
| Years Ended March 31,
(In millions, except per share amounts) | 2020 |  | 2019 |  | 2018
Income from continuing operations | $ | 1,126 |  |  | $ | 254 |  |  | $ | 292 |
Net income attributable to noncontrolling interests | (220 | ) |  | (221 | ) |  | (230 | )
Income from continuing operations attributable to McKesson | 906 |  |  | 33 |  |  | 62 |
Income (loss) from discontinued operations, net of tax | (6 | ) |  | 1 |  |  | 5 |
Net income attributable to McKesson | $ | 900 |  |  | $ | 34 |  |  | $ | 67 |
Weighted average common shares outstanding: |  |  |  |  |
Basic | 181 |  |  | 196 |  |  | 208 |
Effect of dilutive securities: |  |  |  |  |
Restricted stock units | 1 |  |  | 1 |  |  | 1 |
Diluted | 182 |  |  | 197 |  |  | 209 |
Earnings (loss) per common share attributable to McKesson: (1) |  |  |  |  |
Diluted |  |  |  |  |
Continuing operations | $ | 4.99 |  |  | $ | 0.17 |  |  | $ | 0.30 |
Discontinued operations | (0.04 | ) |  | — |  |  | 0.02 |
Total | $ | 4.95 |  |  | $ | 0.17 |  |  | $ | 0.32 |
Basic |  |  |  |  |
Continuing operations | $ | 5.01 |  |  | $ | 0.17 |  |  | $ | 0.30 |
Discontinued operations | (0.03 | ) |  | — |  |  | 0.02 |
Total | $ | 4.98 |  |  | $ | 0.17 |  |  | $ | 0.32 |
(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, 3 million and 2 million potentially dilutive securities for 2020, 2019 and 2018 were excluded from the computations of diluted net earnings per common share, as they were anti-dilutive.

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