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Earnings Attributable to Tennant Company Per Share (Tables) | 3 Months Ended
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Mar. 31, 2020
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Earnings (Loss) per Share | The computations of Basic and Diluted Earnings per Share were as follows:
| Three Months Ended
| March 31
| 2020 |  | 2019
Numerator: |  |  |
Net Earnings Attributable to Tennant Company | $ | 5.2 |  |  | $ | 5.4 |
Denominator: |  |  |
Basic - Weighted Average Shares Outstanding | 18,286,816 |  |  | 18,042,468 |
Effect of dilutive securities: |  |  |
Share-based compensation plans | 379,422 |  |  | 302,743 |
Diluted - Weighted Average Shares Outstanding | 18,666,238 |  |  | 18,345,211 |
Basic Earnings per Share | $ | 0.28 |  |  | $ | 0.30 |
Diluted Earnings per Share | $ | 0.28 |  |  | $ | 0.29 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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