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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 158.4     158.4    
Other comprehensive income, net of taxes (5.7)       (5.7)  
Purchases of treasury stock, including excise tax (34.9)         (34.9)
Net issuance of treasury shares to stock compensation plans (2.2)   (10.9)     8.7
Net issuance of treasury shares to stock compensation plans and other (in shares)   (82,455)        
Stock-based compensation 5.8   5.8      
Dividends declared (6.5)     (6.5)    
Ending balance at Mar. 31, 2023 2,352.5 $ 0.3 333.6 3,225.5 16.7 (1,223.7)
Ending balance (in shares) at Mar. 31, 2023   25,150,165        
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 and other (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