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Earnings Per Share | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share 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 September 30, |  | Nine months ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Basic shares outstanding | 103.4 |  |  | 102.3 |  |  | 103.2 |  |  | 102.1 |
Effect of potential common stock: |  |  |  |  |  |  |
Common stock awards | 1.2 |  |  | 1.4 |  |  | 1.2 |  |  | 1.3 |
Diluted shares outstanding | 104.6 |  |  | 103.7 |  |  | 104.4 |  |  | 103.4 |
For the three and nine months ended September 30, 2018, there were 0.689 and 0.697 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 0.475 and 0.487 outstanding stock options that would have been antidilutive in the respective 2017 periods.

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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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