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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 166.3     166.3    
Total other comprehensive income (loss) (0.2)         (0.2)
Cash dividends declared (22.0)     (22.0)    
Stock-based payments:            
Stock-based compensation 11.3   11.3      
Stock option exercises and other 0.2 0.2 3.7   (3.7)  
Performance share unit transactions (3.6) 0.1 (0.1)   (3.6)  
Stock repurchase program (4.5)       (4.5)  
Ending Balance at Sep. 30, 2024 1,149.4 70.3 306.0 1,060.1 (205.5) (81.5)
Beginning Balance at Jun. 30, 2024 1,099.6 70.3 302.0 1,013.5 (200.8) (85.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 53.9     53.9    
Total other comprehensive income (loss) 3.9         3.9
Cash dividends declared (7.3)     (7.3)    
Stock-based payments:            
Stock-based compensation 3.4   3.4      
Stock option exercises and other 0.3 0.0 0.6   (0.3)  
Stock repurchase program (4.4)       (4.4)  
Ending Balance at Sep. 30, 2024 1,149.4 70.3 306.0 1,060.1 (205.5) (81.5)
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 185.8     185.8    
Total other comprehensive income (loss) 14.2         14.2
Cash dividends declared (25.6)     (25.6)    
Stock-based payments:            
Stock-based compensation 10.8   10.8      
Stock option exercises and other (1.5) 0.2 3.9   (5.6)  
Performance share unit transactions (8.2) 0.2 (0.2)   (8.2)  
Stock repurchase program (39.9)       (39.9)  
Ending Balance at Sep. 30, 2025 1,321.7 70.7 324.3 1,263.0 (261.5) (74.8)
Beginning Balance at Jun. 30, 2025 1,262.2 70.7 319.8 1,203.4 (260.2) (71.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 68.1     68.1    
Total other comprehensive income (loss) (3.3)         (3.3)
Cash dividends declared (8.5)     (8.5)    
Stock-based payments:            
Stock-based compensation 3.6   3.6      
Stock option exercises and other (0.4) 0.0 0.9   (1.3)  
Ending Balance at Sep. 30, 2025 $ 1,321.7 $ 70.7 $ 324.3 $ 1,263.0 $ (261.5) $ (74.8)