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Earnings Attributable to Tennant Company Per Share (Tables) | 6 Months Ended
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Jun. 30, 2019
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 |  | Six Months Ended
| June 30 |  | June 30
| 2019 |  | 2018 |  | 2019 |  | 2018
Numerator: |  |  |  |  |  |  |
Net Earnings Attributable to Tennant Company | $ | 14.8 |  |  | $ | 12.7 |  |  | $ | 20.2 |  |  | $ | 16.0 |
Denominator: |  |  |  |  |  |  |
Basic - Weighted Average Shares Outstanding | 18,082,492 |  |  | 17,943,450 |  |  | 18,062,591 |  |  | 17,867,641 |
Effect of dilutive securities: |  |  |  |  |  |  |
Share-based compensation plans | 312,373 |  |  | 428,088 |  |  | 304,793 |  |  | 436,319 |
Diluted - Weighted Average Shares Outstanding | 18,394,865 |  |  | 18,371,538 |  |  | 18,367,384 |  |  | 18,303,960 |
Basic Earnings per Share | $ | 0.82 |  |  | $ | 0.71 |  |  | $ | 1.12 |  |  | $ | 0.90 |
Diluted Earnings per Share | $ | 0.81 |  |  | $ | 0.69 |  |  | $ | 1.10 |  |  | $ | 0.88 |

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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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