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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 329.0     329.0    
Other comprehensive (loss) income, net of taxes 18.1       18.1  
Purchases of treasury stock, including excise tax (66.5)         (66.5)
Net issuance of treasury shares to stock compensation plans 3.1   (9.4)     12.5
Net issuance of treasury shares to stock compensation plans (in shares)   (68,454)        
Stock-based compensation 10.5   10.5      
Dividends declared (12.8)     (12.8)    
Ending balance at Jun. 30, 2023 2,518.9 $ 0.3 339.8 3,389.7 40.6 (1,251.5)
Ending balance (in shares) at Jun. 30, 2023   25,164,166        
Beginning balance at Mar. 31, 2023 2,352.5 $ 0.3 333.6 3,225.5 16.7 (1,223.7)
Beginning balance (in shares) at Mar. 31, 2023   25,150,165        
Increase (Decrease) in Stockholders' Equity            
Net income 170.5     170.5    
Other comprehensive (loss) income, net of taxes 23.8       23.8  
Purchases of treasury stock, including excise tax (31.6)         (31.6)
Net issuance of treasury shares to stock compensation plans 5.2   1.5     3.7
Net issuance of treasury shares to stock compensation plans (in shares)   14,001        
Stock-based compensation 4.8   4.8      
Dividends declared (6.4)     (6.4)    
Ending balance at Jun. 30, 2023 2,518.9 $ 0.3 339.8 3,389.7 40.6 (1,251.5)
Ending balance (in shares) at Jun. 30, 2023   25,164,166        
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 286.1     286.1    
Other comprehensive (loss) income, net of taxes (1.2)       (1.2)  
Purchases of treasury stock, including excise tax (100.6)         (100.6)
Net issuance of treasury shares to stock compensation plans 6.1   (3.7)     9.8
Net issuance of treasury shares to stock compensation plans (in shares)   (38,675)        
Stock-based compensation 14.2   14.2      
Dividends declared (12.8)     (12.8)    
Ending balance at Jun. 30, 2024 2,866.3 $ 0.3 359.7 3,923.0 27.0 (1,443.7)
Ending balance (in shares) at Jun. 30, 2024   25,092,785        
Beginning balance at Mar. 31, 2024 2,772.4 $ 0.3 351.7 3,791.3 30.3 (1,401.1)
Beginning balance (in shares) at Mar. 31, 2024   25,109,781        
Increase (Decrease) in Stockholders' Equity            
Net income 138.2     138.2    
Other comprehensive (loss) income, net of taxes (3.3)       (3.3)  
Purchases of treasury stock, including excise tax (46.5)         (46.5)
Net issuance of treasury shares to stock compensation plans 5.2   1.4     3.9
Net issuance of treasury shares to stock compensation plans (in shares)   (16,996)        
Stock-based compensation 6.6   6.6      
Dividends declared (6.4)     (6.4)    
Ending balance at Jun. 30, 2024 $ 2,866.3 $ 0.3 $ 359.7 $ 3,923.0 $ 27.0 $ (1,443.7)
Ending balance (in shares) at Jun. 30, 2024   25,092,785