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Income Attributable to Tennant Company Per Share (Tables) | 12 Months Ended
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Dec. 31, 2023
Earnings Per Share [Abstract] |
Schedule of Computations of Basic and Diluted Earnings per Share | The computations of basic and diluted earnings attributable to Tennant Company per share for the years ended December 31 were as follows:
| 2023 |  | 2022 |  | 2021
Numerator: |  |  |  |  |
Net income | $ | 109.5 |  |  | $ | 66.3 |  |  | $ | 64.9 |
Denominator: |  |  |  |  |
Basic - weighted average shares outstanding | 18,509,523 |  | 18,494,356 |  | 18,499,674
Effect of dilutive securities | 274,110 |  | 202,899 |  | 349,543
Diluted - weighted average shares outstanding | 18,783,633 |  | 18,697,255 |  | 18,849,217
Basic earnings per share | $ | 5.92 |  |  | $ | 3.58 |  |  | $ | 3.51 |
Diluted earnings per share | $ | 5.83 |  |  | $ | 3.55 |  |  | $ | 3.44 |

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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://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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