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Income Attributable to Tennant Company Per Share - Computations of Basic and Diluted Earnings (Loss) Attributable to Tennant Company Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Numerator:      
Net income $ 66.3 $ 64.9 $ 33.7
Denominator:      
Basic - weighted average shares outstanding (in shares) 18,494,356 18,499,674 18,349,724
Effect of dilutive securities 202,899 349,543 285,278
Diluted - weighted average shares outstanding (in shares) 18,697,255 18,849,217 18,635,002
Basic earnings per share (in dollars per share) $ 3.58 $ 3.51 $ 1.84
Diluted earnings per share (in dollars per share) $ 3.55 $ 3.44 $ 1.81