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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Millions
Total
Common Stock
Capital in Excess of Par Value
Retained Earnings
Treasury Stock
Accumulated Other Comprehensive Loss
Beginning Balance at Dec. 31, 2018 $ 530.1 $ 66.4 $ 217.0 $ 432.5 $ (88.5) $ (97.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 78.7     78.7    
Total other comprehensive income (loss) (1.5)         (1.5) [1]
Cash dividends declared (14.5)     (14.5)    
Stock-based payments:            
Stock-based compensation 5.2   5.2      
Stock option exercises and other 1.6 0.4 3.4   (2.2)  
Performance share unit transactions (0.9) 0.1 (0.1)   (0.9)  
Stock repurchase program (1.0)       (1.0)  
Ending Balance at Sep. 30, 2019 604.2 66.9 225.5 503.2 (92.6) (98.8)
Beginning Balance at Jun. 30, 2019 580.1 66.7 221.3 479.7 (91.4) (96.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 28.4     28.4    
Total other comprehensive income (loss) (2.6)         (2.6) [1]
Cash dividends declared (4.9)     (4.9)    
Stock-based payments:            
Stock-based compensation 1.7   1.7      
Stock option exercises and other 1.5 0.2 2.5   (1.2)  
Ending Balance at Sep. 30, 2019 604.2 66.9 225.5 503.2 (92.6) (98.8)
Stock-based payments:            
Impact of adoption of ASU 2016-02 | Accounting Standards Update 2016-02 6.5     6.5    
Beginning Balance at Dec. 31, 2019 641.6 66.9 228.6 528.2 (93.0) (89.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 70.1     70.1    
Total other comprehensive income (loss) (0.8)         (0.8) [1]
Cash dividends declared (14.5)     (14.5)    
Stock-based payments:            
Stock-based compensation 5.4   5.4      
Stock option exercises and other (5.4) 0.7 3.6   (9.7)  
Performance share unit transactions (2.9) 0.2 (0.2)   (2.9)  
Stock repurchase program (13.7)       (13.7)  
Ending Balance at Sep. 30, 2020 679.8 67.8 237.4 583.8 (119.3) (89.9)
Beginning Balance at Jun. 30, 2020 655.4 67.5 234.7 563.3 (115.4) (94.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 25.3     25.3    
Total other comprehensive income (loss) 4.8         4.8 [1]
Cash dividends declared (4.8)     (4.8)    
Stock-based payments:            
Stock-based compensation 1.5   1.5      
Stock option exercises and other (2.2) 0.3 1.2   (3.7)  
Stock repurchase program (0.2)       (0.2)  
Ending Balance at Sep. 30, 2020 $ 679.8 $ 67.8 $ 237.4 $ 583.8 $ (119.3) $ (89.9)
[1] Amounts in parentheses indicate losses.