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EARNINGS PER SHARE | 9 Months Ended
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Sep. 30, 2020
Earnings Per Share, Basic and Diluted [Abstract] |
EARNINGS (LOSS) PER SHARE | EARNINGS PER SHARE The computation of basic and diluted earnings per common share was as follows (in millions, except per share data):
| Three Months Ended September 30, |  |  |  | Nine Months Ended September 30, |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
Amounts attributable to Quest Diagnostics’ common stockholders: |  |  |  |  |  |  |
Income from continuing operations | $ | 568 |  |  | $ | 215 |  |  | $ | 852 |  |  | $ | 585 |
Income from discontinued operations, net of taxes | — |  |  | — |  |  | — |  |  | 20 |
Net income attributable to Quest Diagnostics’ common stockholders | $ | 568 |  |  | $ | 215 |  |  | $ | 852 |  |  | $ | 605 |
Income from continuing operations | $ | 568 |  |  | $ | 215 |  |  | $ | 852 |  |  | $ | 585 |
Less: Earnings allocated to participating securities | 2 |  |  | 1 |  |  | 3 |  |  | 2 |
Earnings available to Quest Diagnostics’ common stockholders – basic and diluted | $ | 566 |  |  | $ | 214 |  |  | $ | 849 |  |  | $ | 583 |
Weighted average common shares outstanding – basic | 135 |  |  | 135 |  |  | 134 |  |  | 135 |
Effect of dilutive securities: |  |  |  |  |  |  |
Stock options and performance share units | 2 |  |  | 2 |  |  | 2 |  |  | 1 |
Weighted average common shares outstanding – diluted | 137 |  |  | 137 |  |  | 136 |  |  | 136 |
Earnings per share attributable to Quest Diagnostics’ common stockholders - basic: |  |  |  |  |  |  |
Income from continuing operations | $ | 4.20 |  |  | $ | 1.59 |  |  | $ | 6.33 |  |  | $ | 4.33 |
Income from discontinued operations | — |  |  | — |  |  | — |  |  | 0.15 |
Net income | $ | 4.20 |  |  | $ | 1.59 |  |  | $ | 6.33 |  |  | $ | 4.48 |
Earnings per share attributable to Quest Diagnostics’ common stockholders – diluted: |  |  |  |  |  |  |
Income from continuing operations | $ | 4.14 |  |  | $ | 1.56 |  |  | $ | 6.25 |  |  | $ | 4.27 |
Income from discontinued operations | — |  |  | — |  |  | — |  |  | 0.15 |
Net income | $ | 4.14 |  |  | $ | 1.56 |  |  | $ | 6.25 |  |  | $ | 4.42 |
The following securities were not included in the calculation of diluted earnings per share due to their antidilutive effect:
| Three Months Ended September 30, |  |  |  | Nine Months Ended September 30, |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
Stock options | 1 |  |  | 2 |  |  | 1 |  |  | 3 |
The sum of basic and diluted earnings per share attributable to Quest Diagnostics' common stockholders for the first three quarters of 2020 did not equal the totals for the nine months ended September 30, 2020 due to quarterly fluctuations in the Company's earnings and weighted average common shares outstanding throughout the period as a result of the impact of COVID-19 (see Note 2 for further details) and the temporary cessation of repurchases under the Company's share repurchase program (see Note 10 for further details).

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