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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 81.1     81.1    
Total other comprehensive income (loss) 0.6         0.6
Cash dividends declared (16.5)     (16.5)    
Stock-based payments:            
Stock-based compensation 4.9   4.9      
Stock option exercises and other 0.7 0.7 6.4   (6.4)  
Performance share unit transactions (3.8) 0.2 (0.2)   (3.8)  
Stock repurchase program (3.4)       (3.4)  
Ending Balance at Sep. 30, 2021 765.7 68.7 251.9 669.6 (133.4) (91.1)
Beginning Balance at Jun. 30, 2021 746.0 68.7 249.6 645.9 (129.8) (88.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 29.2     29.2    
Total other comprehensive income (loss) (2.7)         (2.7)
Cash dividends declared (5.5)     (5.5)    
Stock-based payments:            
Stock-based compensation 1.7   1.7      
Stock option exercises and other 0.2 0.0 0.6   (0.4)  
Stock repurchase program (3.2)       (3.2)  
Ending Balance at Sep. 30, 2021 765.7 68.7 251.9 669.6 (133.4) (91.1)
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 85.8     85.8    
Total other comprehensive income (loss) (13.8)         (13.8)
Cash dividends declared (16.4)     (16.4)    
Stock-based payments:            
Stock-based compensation 6.8   6.8      
Stock option exercises and other (1.0) 0.2 1.7   (2.9)  
Performance share unit transactions (1.3) 0.1 (0.1)   (1.3)  
Stock repurchase program (16.1)       (16.1)  
Ending Balance at Sep. 30, 2022 828.0 69.2 265.1 753.0 (171.3) (88.0)
Beginning Balance at Jun. 30, 2022 809.1 69.2 262.4 726.7 (170.2) (79.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 31.8     31.8    
Total other comprehensive income (loss) (9.0)         (9.0)
Cash dividends declared (5.5)     (5.5)    
Stock-based payments:            
Stock-based compensation 2.1   2.1      
Stock option exercises and other (0.5) 0.0 0.6   (1.1)  
Ending Balance at Sep. 30, 2022 $ 828.0 $ 69.2 $ 265.1 $ 753.0 $ (171.3) $ (88.0)