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Earnings Attributable to Tennant Company Per Share | 9 Months Ended
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Sep. 30, 2019
Earnings Per Share [Abstract] |
Earnings (Loss) Attributable to Tennant Company Per Share | 18. Earnings Attributable to Tennant Company Per Share The computations of Basic and Diluted Earnings per Share were as follows:
| Three Months Ended |  | Nine Months Ended
| September 30 |  | September 30
| 2019 |  | 2018 |  | 2019 |  | 2018
Numerator: |  |  |  |  |  |  |
Net Earnings Attributable to Tennant Company | $ | 14.6 |  |  | $ | 9.7 |  |  | $ | 34.8 |  |  | $ | 25.7 |
Denominator: |  |  |  |  |  |  |
Basic - Weighted Average Shares Outstanding | 18,134,909 |  |  | 17,998,917 |  |  | 18,086,962 |  |  | 17,911,880 |
Effect of dilutive securities: |  |  |  |  |  |  |
Share-based compensation plans | 353,039 |  |  | 440,704 |  |  | 315,967 |  |  | 432,933 |
Diluted - Weighted Average Shares Outstanding | 18,487,948 |  |  | 18,439,621 |  |  | 18,402,929 |  |  | 18,344,813 |
Basic Earnings per Share | $ | 0.81 |  |  | $ | 0.54 |  |  | $ | 1.93 |  |  | $ | 1.43 |
Diluted Earnings per Share | $ | 0.79 |  |  | $ | 0.52 |  |  | $ | 1.89 |  |  | $ | 1.40 |
Excluded from the dilutive securities shown above were options to purchase and shares to be paid out under share-based compensation plans of 485,853 and 139,106 shares of common stock during the three months ended September 30, 2019 and 2018, respectively. Excluded from the dilutive securities shown above were options to purchase and shares to be paid out under share-based compensation plans of 687,972 and 214,605 shares of common stock during the nine months ended September 30, 2019 and 2018, respectively. These exclusions were made if the exercise prices of the options are greater than the average market price of our common stock for the period, if the number of shares we can repurchase under the treasury stock method exceeds the weighted average shares outstanding in the options or if we have a net loss, as these effects are 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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