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Income Attributable to Tennant Company Per Share (Tables) | 9 Months Ended
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Sep. 30, 2025
Earnings Per Share [Abstract] |
Schedule of Computations of Basic and Diluted Earnings per Share | The computations of basic and diluted earnings per share were as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Numerator: |  |  |  |  |  |  |
Net income | $ | 14.9 |  |  | $ | 20.8 |  |  | $ | 48.2 |  |  | $ | 77.1 |
Denominator: |  |  |  |  |  |  |
Basic - weighted average shares outstanding | 18,314,488 |  | 18,810,267 |  | 18,507,222 |  | 18,790,824
Effect of dilutive securities | 233,236 |  | 283,606 |  | 215,031 |  | 329,631
Diluted - weighted average shares outstanding | 18,547,724 |  | 19,093,873 |  | 18,722,253 |  | 19,120,455
Basic earnings per share | $ | 0.81 |  |  | $ | 1.11 |  |  | $ | 2.60 |  |  | $ | 4.10 |
Diluted earnings per share | $ | 0.80 |  |  | $ | 1.09 |  |  | $ | 2.57 |  |  | $ | 4.03 |

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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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