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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, Common
Accumulated Other Comprehensive Loss
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 67.7     67.7    
Total other comprehensive income (loss) 4.3         4.3
Cash dividends declared (11.6)     (11.6)    
Stock-based payments:            
Stock-based compensation 5.1   5.1      
Stock option exercises and other 0.8 0.3 4.1   (3.6)  
Performance share unit transactions (3.3) 0.1 (0.1)   (3.3)  
Ending Balance at Jun. 30, 2023 923.9 69.9 280.9 838.3 (185.5) (79.7)
Beginning Balance at Mar. 31, 2023 882.0 69.7 274.7 804.1 (183.1) (83.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 40.3          
Total other comprehensive income (loss) 3.7         3.7
Cash dividends declared (6.1)     (6.1)    
Stock-based payments:            
Stock-based compensation 3.1   3.1      
Stock option exercises and other 0.9 0.2 3.1   (2.4)  
Ending Balance at Jun. 30, 2023 923.9 69.9 280.9 838.3 (185.5) (79.7)
Beginning Balance at Dec. 31, 2023 1,001.9 70.0 291.1 915.8 (193.7) (81.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 112.4     112.4    
Total other comprehensive income (loss) (4.1)         (4.1)
Cash dividends declared (14.7)     (14.7)    
Stock-based payments:            
Stock-based compensation 7.9   7.9      
Stock option exercises and other (0.1) 0.2 3.1   (3.4)  
Performance share unit transactions (3.6) 0.1 (0.1)   (3.6)  
Stock repurchase program (0.1)       (0.1)  
Ending Balance at Jun. 30, 2024 1,099.6 70.3 302.0 1,013.5 (200.8) (85.4)
Beginning Balance at Mar. 31, 2024 1,044.4 70.2 296.8 960.1 (198.6) (84.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 60.8          
Total other comprehensive income (loss) (1.3)         (1.3)
Cash dividends declared (7.4)     (7.4)    
Stock-based payments:            
Stock-based compensation 3.5   3.5      
Stock option exercises and other (0.4) 0.1 1.7   (2.2)  
Ending Balance at Jun. 30, 2024 $ 1,099.6 $ 70.3 $ 302.0 $ 1,013.5 $ (200.8) $ (85.4)