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Consolidated Statements of Equity - USD ($)
$ in Millions
Total
Tennant Company Shareholders' Equity
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Noncontrolling Interest
Beginning balance (in shares) at Dec. 31, 2020     18,503,805        
Beginning balance at Dec. 31, 2020 $ 406.1 $ 404.8 $ 6.9 $ 54.7 $ 363.3 $ (20.1) $ 1.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 64.9 64.9     64.9    
Other comprehensive (loss) income (17.8) (17.8)       (17.8)  
Issue stock for directors, employee benefit and stock plans, net of related tax withholdings (in shares)     228,293        
Issue stock for directors, employee benefit and stock plans, net of related tax withholdings 5.0 5.0 $ 0.1 4.9      
Share-based compensation 9.5 9.5   9.5      
Dividends paid per common share (17.5) (17.5)     (17.5)    
Repurchases of common stock (in shares)     (196,982)        
Repurchases of common stock (15.0) (15.0)   (15.0)      
Other (0.1) (0.1)     (0.1)    
Ending balance (in shares) at Dec. 31, 2021     18,535,116        
Ending balance at Dec. 31, 2021 435.1 433.8 $ 7.0 54.1 410.6 (37.9) 1.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 66.3 66.3     66.3    
Other comprehensive (loss) income (12.3) (12.3)       (12.3)  
Issue stock for directors, employee benefit and stock plans, net of related tax withholdings (in shares)     66,125        
Issue stock for directors, employee benefit and stock plans, net of related tax withholdings (0.9) (0.9)   (0.9)      
Share-based compensation 7.8 7.8   7.8      
Dividends paid per common share $ (18.9) (18.9)     (18.9)    
Repurchases of common stock (in shares) (79,756)   (79,756)        
Repurchases of common stock $ (5.0) (5.0)   (5.0)      
Ending balance (in shares) at Dec. 31, 2022 18,521,485   18,521,485        
Ending balance at Dec. 31, 2022 $ 472.1 470.8 $ 7.0 56.0 458.0 (50.2) 1.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 109.5 109.5     109.5    
Other comprehensive (loss) income 7.9 7.9       7.9  
Issue stock for directors, employee benefit and stock plans, net of related tax withholdings (in shares)     400,819        
Issue stock for directors, employee benefit and stock plans, net of related tax withholdings 19.0 19.0   19.0      
Share-based compensation 11.6 11.6   11.6      
Dividends paid per common share $ (20.1) (20.1)     (20.1)    
Repurchases of common stock (in shares) (290,920)   (290,920)        
Repurchases of common stock $ (21.7) (21.7)   (21.7)      
Ending balance (in shares) at Dec. 31, 2023 18,521,485   18,631,384        
Ending balance at Dec. 31, 2023 $ 578.3 $ 577.0 $ 7.0 $ 64.9 $ 547.4 $ (42.3) $ 1.3