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Weighted Average Shares Outstanding | 6 Months Ended
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Jun. 30, 2021
Earnings Per Share [Abstract] |
Weighted Average Shares Outstanding | Weighted Average Shares Outstanding Basic earnings per share were calculated using net earnings and the weighted average number of shares of common stock outstanding during the respective period. Diluted earnings per share were calculated using net earnings and the weighted average number of shares of common stock and potential common stock outstanding during the respective period. Potentially dilutive common stock consisted of stock options based upon the trading price of Roper’s common stock. The effects of potential common stock were determined using the treasury stock method. Weighted average shares outstanding are shown below:
| Three months ended June 30, |  | Six months ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Basic shares outstanding | 105.3 |  |  | 104.5 |  |  | 105.1 |  |  | 104.4 |
Effect of potential common stock: |  |  |  |  |  |  |
Common stock awards | 1.1 |  |  | 1.0 |  |  | 1.1 |  |  | 1.0 |
Diluted shares outstanding | 106.4 |  |  | 105.5 |  |  | 106.2 |  |  | 105.4 |
For the three and six months ended June 30, 2021, there were 0.525 and 0.531 outstanding stock options, respectively, that were not included in the determination of diluted earnings per share because doing so would have been antidilutive, as compared to 1.322 outstanding stock options that would have been antidilutive in the respective 2020 periods.

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