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Consolidated Statements Of Stockholders' Equity - USD ($)
$ in Millions
Total
Common Stock Par Value
Capital in Excess of Par Value
Retained Earnings
Treasury Stock
Accumulated Other Comprehensive Loss
Beginning Balance at Dec. 31, 2017 $ 457.4 $ 66.1 $ 207.7 $ 346.6 $ (86.1) $ (76.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 94.0     94.0    
Total other comprehensive income (loss) (9.8)         (9.8)
Cash dividends declared (18.7)     (18.7)    
Stock-based payments:            
Stock-based compensation 7.0   7.0      
Stock option exercises and other 1.4 0.3 2.3   (1.2)  
Stock repurchase program (1.2)       (1.2)  
Ending Balance at Dec. 31, 2018 $ 530.1 66.4 217.0 432.5 (88.5) (97.3)
Stock-based payments:            
Cash dividends declared per common share (usd per share) $ 0.31          
Impact of adoption of new accounting principle | Accounting Standards Update 2018-02 $ 0.0     10.6   (10.6)
Net income 108.5     108.5    
Total other comprehensive income (loss) 8.2         8.2
Cash dividends declared (19.3)     (19.3)    
Stock-based compensation 8.1   8.1      
Stock option exercises and other 1.4 0.4 3.6   (2.6)  
Performance share unit transactions (0.9) 0.1 (0.1)   (0.9)  
Stock repurchase program (1.0)       (1.0)  
Ending Balance at Dec. 31, 2019 $ 641.6 66.9 228.6 528.2 (93.0) (89.1)
Stock-based payments:            
Cash dividends declared per common share (usd per share) $ 0.32          
Impact of adoption of new accounting principle | Accounting Standards Update 2016-02 $ 6.5     6.5    
Net income 96.2     96.2    
Total other comprehensive income (loss) (2.6)         (2.6)
Cash dividends declared (19.4)     (19.4)    
Stock-based compensation 7.8   7.8      
Stock option exercises and other (4.9) 0.7 4.6   (10.2)  
Performance share unit transactions (2.9) 0.2 (0.2)   (2.9)  
Stock repurchase program (13.7)       (13.7)  
Ending Balance at Dec. 31, 2020 $ 702.1 $ 67.8 $ 240.8 $ 605.0 $ (119.8) $ (91.7)
Stock-based payments:            
Cash dividends declared per common share (usd per share) $ 0.32