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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Numerator:      
Net income $ 109.5 $ 66.3 $ 64.9
Denominator:      
Basic - weighted average shares outstanding (in shares) 18,509,523 18,494,356 18,499,674
Effect of dilutive securities 274,110 202,899 349,543
Diluted - weighted average shares outstanding (in shares) 18,783,633 18,697,255 18,849,217
Basic earnings per share (in dollars per share) $ 5.92 $ 3.58 $ 3.51
Diluted earnings per share (in dollars per share) $ 5.83 $ 3.55 $ 3.44