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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
Treasury Stock
Beginning balance at Dec. 31, 2023 $ 2,674.4 $ 0.3 $ 349.1 $ 3,649.8 $ 28.1 $ (1,352.8)
Beginning balance (in shares) at Dec. 31, 2023   25,131,460        
Increase (Decrease) in Stockholders' Equity            
Net income 147.9     147.9    
Other comprehensive income, net of taxes 2.1       2.1  
Purchases of treasury stock, including excise tax (54.2)         (54.2)
Net issuance of treasury shares to stock compensation plans 0.9   (5.0)     5.9
Net issuance of treasury shares to stock compensation plans (in shares)   (21,679)        
Stock-based compensation 7.6   7.6      
Dividends declared (6.4)     (6.4)    
Ending balance at Mar. 31, 2024 $ 2,772.4 $ 0.3 351.7 3,791.3 30.3 (1,401.1)
Ending balance (in shares) at Mar. 31, 2024   25,109,781        
Increase (Decrease) in Stockholders' Equity            
Dividends declared (in dollars per share) $ 0.47          
Beginning balance at Dec. 31, 2024 $ 2,974.3 $ 0.2 356.1 4,122.4 1.6 (1,506.2)
Beginning balance (in shares) at Dec. 31, 2024   24,989,807        
Increase (Decrease) in Stockholders' Equity            
Net income 128.1     128.1    
Other comprehensive income, net of taxes 13.8       13.8  
Purchases of treasury stock, including excise tax (123.5)         (123.5)
Net issuance of treasury shares to stock compensation plans (1.1)   (3.4)     2.3
Net issuance of treasury shares to stock compensation plans (in shares)   (25,429)        
Stock-based compensation 7.6   7.6      
Dividends declared (6.6)     (6.6)    
Ending balance at Mar. 31, 2025 $ 2,992.5 $ 0.2 $ 360.3 $ 4,243.9 $ 15.4 $ (1,627.4)
Ending balance (in shares) at Mar. 31, 2025   24,964,378        
Increase (Decrease) in Stockholders' Equity            
Dividends declared (in dollars per share) $ 0.50