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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, 2020 $ 702.1 $ 67.8 $ 240.8 $ 605.0 $ (119.8) $ (91.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 51.9     51.9    
Total other comprehensive income (loss) 3.3         3.3
Cash dividends declared (11.0)     (11.0)    
Stock-based payments:            
Stock-based compensation 3.2   3.2      
Stock option exercises and other 0.5 0.7 5.8   (6.0)  
Performance share unit transactions (3.8) 0.2 (0.2)   (3.8)  
Stock repurchase program (0.2)       (0.2)  
Ending Balance at Jun. 30, 2021 746.0 68.7 249.6 645.9 (129.8) (88.4)
Beginning Balance at Mar. 31, 2021 719.6 68.4 245.2 621.7 (124.3) (91.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 29.7     29.7    
Total other comprehensive income (loss) 3.0         3.0
Cash dividends declared (5.5)     (5.5)    
Stock-based payments:            
Stock-based compensation 1.9   1.9      
Stock option exercises and other (2.5) 0.3 2.5   (5.3)  
Stock repurchase program (0.2)       (0.2)  
Ending Balance at Jun. 30, 2021 746.0 68.7 249.6 645.9 (129.8) (88.4)
Beginning Balance at Dec. 31, 2021 784.0 68.9 256.7 683.6 (151.0) (74.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 54.0     54.0    
Total other comprehensive income (loss) (4.8)         (4.8)
Cash dividends declared (10.9)     (10.9)    
Stock-based payments:            
Stock-based compensation 4.7   4.7      
Stock option exercises and other (0.5) 0.2 1.1   (1.8)  
Performance share unit transactions (1.3) 0.1 (0.1)   (1.3)  
Stock repurchase program (16.1)       (16.1)  
Ending Balance at Jun. 30, 2022 809.1 69.2 262.4 726.7 (170.2) (79.0)
Beginning Balance at Mar. 31, 2022 787.8 69.1 259.3 698.6 (166.5) (72.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 33.5     33.5    
Total other comprehensive income (loss) (6.3)         (6.3)
Cash dividends declared (5.4)     (5.4)    
Stock-based payments:            
Stock-based compensation 2.3   2.3      
Stock option exercises and other (0.3) 0.1 0.8   (1.2)  
Stock repurchase program (2.5)       (2.5)  
Ending Balance at Jun. 30, 2022 $ 809.1 $ 69.2 $ 262.4 $ 726.7 $ (170.2) $ (79.0)