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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 at Dec. 31, 2021 $ 1,825.2 $ 0.3 $ 325.8 $ 2,345.9 $ (156.2) $ (690.4)
Beginning Balance (in shares) at Dec. 31, 2021   25,336,054        
Increase (Decrease) in Stockholders' Equity            
Net income 594.6     594.6    
Other comprehensive income (loss), net of tax 151.5       151.5  
Purchases of treasury stock, including excise tax (359.5)         (359.5)
Net issuance of treasury shares to stock compensation plans (0.8)   (10.2)     9.4
Net issuance of treasury shares to stock compensation plans and other (in shares)   (96,547)        
Stock-based compensation 21.2   21.2      
Dividends declared (18.2)     (18.2)    
Ending balance at Sep. 30, 2022 2,214.1 $ 0.3 336.8 2,922.3 (4.7) (1,040.5)
Ending Balance (in shares) at Sep. 30, 2022   25,239,507        
Beginning balance at Jun. 30, 2022 2,004.5 $ 0.3 331.8 2,732.5 (128.3) (931.8)
Beginning Balance (in shares) at Jun. 30, 2022   25,258,744        
Increase (Decrease) in Stockholders' Equity            
Net income 195.7     195.7    
Other comprehensive income (loss), net of tax 123.5       123.5  
Purchases of treasury stock, including excise tax (105.4)         (105.4)
Net issuance of treasury shares to stock compensation plans (4.5)   (1.2)     (3.3)
Net issuance of treasury shares to stock compensation plans and other (in shares)   (19,237)        
Stock-based compensation 6.2   6.2      
Dividends declared (6.0)     (6.0)    
Ending balance at Sep. 30, 2022 2,214.1 $ 0.3 336.8 2,922.3 (4.7) (1,040.5)
Ending Balance (in shares) at Sep. 30, 2022   25,239,507        
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 income (loss), net of tax 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 and other (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 income (loss), net of tax (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 and other (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