v3.26.1
Income Attributable to Tennant Company Per Share - Schedule of Computations of Basic and Diluted Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Numerator:        
Net income $ 7.6 $ 20.2 $ 7.8 $ 33.3
Denominator:        
Basic - weighted average shares outstanding (in shares) 16,898,741 18,508,758 17,226,826 18,605,187
Effect of dilutive securities (in shares) 272,626 179,160 229,523 215,111
Diluted - weighted average shares outstanding (in shares) 17,171,367 18,687,918 17,456,349 18,820,298
Basic earnings per share (in dollars per share) $ 0.44 $ 1.10 $ 0.45 $ 1.79
Diluted earnings per share (in dollars per share) $ 0.44 $ 1.08 $ 0.45 $ 1.77