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Income Attributable to Tennant Company Per Share
 12 Months Ended
Dec. 31, 2023
Earnings Per Share [Abstract]  
Income Attributable to Tennant Company Per Share Income Attributable to Tennant Company Per Share
The computations of basic and diluted earnings attributable to Tennant Company per share for the years ended December 31 were as follows:
202320222021
Numerator:
Net income$109.5 $66.3 $64.9 
Denominator:
Basic - weighted average shares outstanding18,509,52318,494,35618,499,674
Effect of dilutive securities274,110202,899349,543
Diluted - weighted average shares outstanding18,783,63318,697,25518,849,217
Basic earnings per share$5.92 $3.58 $3.51 
Diluted earnings per share$5.83 $3.55 $3.44 
Excluded from the dilutive securities shown above were options to purchase and shares to be paid out under share-based compensation plans of 249,690, 649,054 and 171,273 shares of common stock during 2023, 2022 and 2021, respectively. These exclusions were made if the exercise prices of these options are greater than the average market price of our common stock for the period, if the number of shares we can repurchase under the treasury stock method exceeds the weighted shares outstanding in the options or if we have a net loss, as these effects are anti-dilutive.