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Earnings Attributable to Tennant Company Per Share (Tables) | 9 Months Ended
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Sep. 30, 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 |  | Nine Months Ended
| September 30 |  | September 30
| 2020 |  | 2019 |  | 2020 |  | 2019
Numerator: |  |  |  |  |  |  |
Net Earnings Attributable to Tennant Company | $ | 11.7 |  |  | $ | 14.6 |  |  | $ | 31.2 |  |  | $ | 34.8 |
Denominator: |  |  |  |  |  |  |
Basic - Weighted Average Shares Outstanding | 18,371,883 |  |  | 18,134,909 |  |  | 18,335,430 |  |  | 18,086,962 |
Effect of dilutive securities: |  |  |  |  |  |  |
Share-based compensation plans | 276,445 |  |  | 353,039 |  |  | 288,537 |  |  | 315,967 |
Diluted - Weighted Average Shares Outstanding | 18,648,328 |  |  | 18,487,948 |  |  | 18,623,967 |  |  | 18,402,929 |
Basic Earnings per Share | $ | 0.64 |  |  | $ | 0.81 |  |  | $ | 1.70 |  |  | $ | 1.93 |
Diluted Earnings per Share | $ | 0.63 |  |  | $ | 0.79 |  |  | $ | 1.68 |  |  | $ | 1.89 |

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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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