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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($)
$ in Millions
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Beginning balance (in shares) at Dec. 31, 2023   25,131,460        
Beginning balance at Dec. 31, 2023 $ 2,674.4 $ 0.3 $ 349.1 $ 3,649.8 $ 28.1 $ (1,352.8)
Increase (Decrease) in Stockholders' Equity            
Net income 403.3     403.3    
Other comprehensive income (loss), net of taxes 17.7       17.7  
Purchases of treasury stock, including excise tax (130.7)         (130.7)
Net issuance of treasury shares to stock compensation plans (in shares)   (49,320)        
Net issuance of treasury shares to stock compensation plans 10.6   (2.1)     12.7
Stock-based compensation 20.0   20.0      
Dividends declared (19.1)     (19.1)    
Ending balance (in shares) at Sep. 30, 2024   25,082,140        
Ending balance at Sep. 30, 2024 2,976.2 $ 0.3 367.0 4,033.9 45.8 (1,470.8)
Beginning balance (in shares) at Jun. 30, 2024   25,092,785        
Beginning balance at Jun. 30, 2024 2,866.3 $ 0.3 359.7 3,923.0 27.0 (1,443.7)
Increase (Decrease) in Stockholders' Equity            
Net income 117.3     117.3    
Other comprehensive income (loss), net of taxes 18.8       18.8  
Purchases of treasury stock, including excise tax (30.1)         (30.1)
Net issuance of treasury shares to stock compensation plans (in shares)   (10,645)        
Net issuance of treasury shares to stock compensation plans 4.5   1.6     2.9
Stock-based compensation 5.7   5.7      
Dividends declared (6.4)     (6.4)    
Ending balance (in shares) at Sep. 30, 2024   25,082,140        
Ending balance at Sep. 30, 2024 2,976.2 $ 0.3 367.0 4,033.9 45.8 (1,470.8)
Beginning balance (in shares) at Dec. 31, 2024   24,989,807        
Beginning balance at Dec. 31, 2024 2,974.3 $ 0.2 356.1 4,122.4 1.6 (1,506.2)
Increase (Decrease) in Stockholders' Equity            
Net income 281.6     281.6    
Other comprehensive income (loss), net of taxes 33.3       33.3  
Purchases of treasury stock, including excise tax (251.7)         (251.7)
Net issuance of treasury shares to stock compensation plans (in shares)   (42,370)        
Net issuance of treasury shares to stock compensation plans 12.7   3.8     8.9
Stock-based compensation 22.5   22.5      
Dividends declared (19.6)     (19.6)    
Ending balance (in shares) at Sep. 30, 2025   24,947,437        
Ending balance at Sep. 30, 2025 3,053.1 $ 0.2 382.4 4,384.4 34.9 (1,748.9)
Beginning balance (in shares) at Jun. 30, 2025   24,954,226        
Beginning balance at Jun. 30, 2025 3,136.0 $ 0.2 372.0 4,377.9 54.4 (1,668.6)
Increase (Decrease) in Stockholders' Equity            
Net income 13.0     13.0    
Other comprehensive income (loss), net of taxes (19.4)       (19.4)  
Purchases of treasury stock, including excise tax (83.3)         (83.3)
Net issuance of treasury shares to stock compensation plans (in shares)   (6,789)        
Net issuance of treasury shares to stock compensation plans 6.6   3.7     2.9
Stock-based compensation 6.7   6.7      
Dividends declared (6.5)     (6.5)    
Ending balance (in shares) at Sep. 30, 2025   24,947,437        
Ending balance at Sep. 30, 2025 $ 3,053.1 $ 0.2 $ 382.4 $ 4,384.4 $ 34.9 $ (1,748.9)