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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Earnings per Share
The computations of Basic and Diluted Earnings (Loss) Attributable to Tennant Company per Share for the years ended December 31 were as follows:
 
2019
 
2018
 
2017
Numerator:
 
 
 
 
 
Net Earnings (Loss) Attributable to Tennant Company
$
45.8

 
$
33.4

 
$
(6.2
)
Denominator:
 

 
 

 
 

Basic - Weighted Average Shares Outstanding
18,118,486

 
17,940,438

 
17,695,390

Effect of dilutive securities
334,659

 
398,131

 
—

Diluted - Weighted Average Shares Outstanding
18,453,145

 
18,338,569

 
17,695,390

Basic Earnings (Loss) per Share
$
2.53

 
$
1.86

 
$
(0.35
)
Diluted Earnings (Loss) per Share
$
2.48

 
$
1.82

 
$
(0.35
)