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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Millions, $ in Millions
Total
Common Stock
Treasury Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Dec. 31, 2018   215.2 7.5      
Beginning balance at Dec. 31, 2018 $ 3,140.4 $ 215.2 $ (1,015.4) $ 1,384.4 $ 2,694.7 $ (138.5)
Increase (Decrease) in Stockholders' Equity            
Net income 1,046.9       1,046.9  
Other comprehensive income (loss), net of tax (17.5)         (17.5)
Common stock issued under equity plans (in shares)   2.9        
Common stock issued under equity plans 160.5 $ 2.9   157.6    
Stock-based compensation expense 81.3     81.3    
Purchases of treasury stock (in shares)     1.5      
Purchases of treasury stock (263.3)   $ (263.3)      
Ending balance (in shares) at Dec. 31, 2019   218.1 9.0      
Ending balance at Dec. 31, 2019 4,148.3 $ 218.1 $ (1,278.7) 1,623.3 3,741.6 (156.0)
Increase (Decrease) in Stockholders' Equity            
Net income 823.4       823.4  
Other comprehensive income (loss), net of tax (5.1)         (5.1)
Common stock issued under equity plans (in shares)   4.5        
Common stock issued under equity plans 140.5 $ 4.5   136.0    
Stock-based compensation expense 92.6     92.6    
Purchases of treasury stock (in shares)     3.1      
Purchases of treasury stock (625.4)   $ (625.4)      
Stock issued to effect stock split (in shares)   413.8        
Stock issued to effect stock split 0.0 $ 413.8   (413.8)    
Ending balance (in shares) at Dec. 31, 2020   636.4 12.1      
Ending balance at Dec. 31, 2020 4,574.3 $ 636.4 $ (1,904.1) 1,438.1 4,565.0 (161.1)
Increase (Decrease) in Stockholders' Equity            
Net income 1,503.1       1,503.1  
Other comprehensive income (loss), net of tax 3.4         3.4
Common stock issued under equity plans (in shares)   5.6        
Common stock issued under equity plans 158.6 $ 5.6   153.0    
Stock-based compensation expense 109.3     109.3    
Purchases of treasury stock (in shares)     5.8      
Purchases of treasury stock (512.8)   $ (512.8)      
Ending balance (in shares) at Dec. 31, 2021   642.0 17.9      
Ending balance at Dec. 31, 2021 $ 5,835.9 $ 642.0 $ (2,416.9) $ 1,700.4 $ 6,068.1 $ (157.7)