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Earnings Per Share - Computations of Basic and Diluted Earnings (Loss) Attributable to Tennant Company Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Numerator:        
Net income $ 31.3 $ 16.6 $ 55.6 $ 26.9
Denominator:        
Basic - weighted average shares outstanding (in shares) 18,436,367 18,507,073 18,442,862 18,485,367
Effect of dilutive securities: 277,088 176,725 248,874 250,546
Diluted - weighted average shares outstanding (in shares) 18,713,455 18,683,798 18,691,736 18,735,913
Basic earnings per share (in dollars per share) $ 1.70 $ 0.90 $ 3.02 $ 1.46
Diluted earnings per share (in dollars per share) $ 1.68 $ 0.89 $ 2.98 $ 1.44