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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, 2023 $ 1,001.9 $ 70.0 $ 291.1 $ 915.8 $ (193.7) $ (81.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 51.6     51.6    
Total other comprehensive income (loss) (2.8)         (2.8)
Cash dividends declared (7.3)     (7.3)    
Stock-based payments:            
Stock-based compensation 4.4   4.4      
Stock option exercises and other 0.3 0.1 1.4   (1.2)  
Performance share unit transactions (3.6) 0.1 (0.1)   (3.6)  
Stock repurchase program (0.1)       (0.1)  
Ending Balance at Mar. 31, 2024 1,044.4 70.2 296.8 960.1 (198.6) (84.1)
Beginning Balance at Dec. 31, 2024 1,186.1 70.3 309.8 1,102.8 (207.8) (89.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 46.3     46.3    
Total other comprehensive income (loss) 4.3         4.3
Cash dividends declared (8.6)     (8.6)    
Stock-based payments:            
Stock-based compensation 2.4   2.4      
Stock option exercises and other (0.2) 0.1 0.2   (0.5)  
Performance share unit transactions (8.2) 0.2 (0.2)   (8.2)  
Stock repurchase program (19.7)       (19.7)  
Ending Balance at Mar. 31, 2025 $ 1,202.4 $ 70.6 $ 312.2 $ 1,140.5 $ (236.2) $ (84.7)