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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, 2022 $ 2,237.5 $ 0.3 $ 338.7 $ 3,073.6 $ 22.5 $ (1,197.5)
Beginning balance (in shares) at Dec. 31, 2022   25,232,620        
Increase (Decrease) in Stockholders' Equity            
Net income 492.9     492.9    
Other comprehensive (loss) income, net of taxes 9.1       9.1  
Purchases of treasury stock, including excise tax (131.6)         (131.6)
Net issuance of treasury shares to stock compensation plans 7.2   (8.4)     15.6
Net issuance of treasury shares to stock compensation plans (in shares)   (82,754)        
Stock-based compensation 15.5   15.5      
Dividends declared (19.2)     (19.2)    
Ending balance at Sep. 30, 2023 2,611.4 $ 0.3 345.8 3,547.2 31.6 (1,313.5)
Ending balance (in shares) at Sep. 30, 2023   25,149,866        
Beginning balance at Jun. 30, 2023 2,518.9 $ 0.3 339.8 3,389.7 40.6 (1,251.5)
Beginning balance (in shares) at Jun. 30, 2023   25,164,166        
Increase (Decrease) in Stockholders' Equity            
Net income 163.9     163.9    
Other comprehensive (loss) income, net of taxes (9.0)       (9.0)  
Purchases of treasury stock, including excise tax (65.2)         (65.2)
Net issuance of treasury shares to stock compensation plans 4.2   1.0     3.2
Net issuance of treasury shares to stock compensation plans (in shares)   (14,300)        
Stock-based compensation 5.0   5.0      
Dividends declared (6.4)     (6.4)    
Ending balance at Sep. 30, 2023 2,611.4 $ 0.3 345.8 3,547.2 31.6 (1,313.5)
Ending balance (in shares) at Sep. 30, 2023   25,149,866        
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 403.3     403.3    
Other comprehensive (loss) income, 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 10.6   (2.1)     12.7
Net issuance of treasury shares to stock compensation plans (in shares)   (49,320)        
Stock-based compensation 20.0   20.0      
Dividends declared (19.1)     (19.1)    
Ending balance at Sep. 30, 2024 2,976.2 $ 0.3 367.0 4,033.9 45.8 (1,470.8)
Ending balance (in shares) at Sep. 30, 2024   25,082,140        
Beginning balance at Jun. 30, 2024 2,866.3 $ 0.3 359.7 3,923.0 27.0 (1,443.7)
Beginning balance (in shares) at Jun. 30, 2024   25,092,785        
Increase (Decrease) in Stockholders' Equity            
Net income 117.3     117.3    
Other comprehensive (loss) income, 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 4.5   1.6     2.9
Net issuance of treasury shares to stock compensation plans (in shares)   (10,645)        
Stock-based compensation 5.7   5.7      
Dividends declared (6.4)     (6.4)    
Ending balance at Sep. 30, 2024 $ 2,976.2 $ 0.3 $ 367.0 $ 4,033.9 $ 45.8 $ (1,470.8)
Ending balance (in shares) at Sep. 30, 2024   25,082,140