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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Numerator:      
Net income $ 83.7 $ 109.5 $ 66.3
Denominator:      
Basic - weighted average shares outstanding (in shares) 18,786,871 18,509,523 18,494,356
Effect of dilutive securities 309,267 274,110 202,899
Diluted - weighted average shares outstanding (in shares) 19,096,138 18,783,633 18,697,255
Basic earnings per share (in dollars per share) $ 4.46 $ 5.92 $ 3.58
Diluted earnings per share (in dollars per share) $ 4.38 $ 5.83 $ 3.55