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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, 2021 $ 784.0 $ 68.9 $ 256.7 $ 683.6 $ (151.0) $ (74.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 20.5     20.5    
Total other comprehensive income (loss) 1.5         1.5
Cash dividends declared (5.5)     (5.5)    
Stock-based payments:            
Stock-based compensation 2.4   2.4      
Stock option exercises and other (0.2) 0.1 0.3   (0.6)  
Performance share unit transactions (1.3) 0.1 (0.1)   (1.3)  
Stock repurchase program (13.6)       (13.6)  
Ending Balance at Mar. 31, 2022 787.8 69.1 259.3 698.6 (166.5) (72.7)
Beginning Balance at Dec. 31, 2022 860.9 69.5 271.8 782.2 (178.6) (84.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 27.4     27.4    
Total other comprehensive income (loss) 0.6         0.6
Cash dividends declared (5.5)     (5.5)    
Stock-based payments:            
Stock-based compensation 2.0   2.0      
Stock option exercises and other (0.1) 0.1 1.0   (1.2)  
Performance share unit transactions (3.3) 0.1 (0.1)   (3.3)  
Ending Balance at Mar. 31, 2023 $ 882.0 $ 69.7 $ 274.7 $ 804.1 $ (183.1) $ (83.4)