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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
Impact to retained earnings from adoption of ASU 2016-16 and ASU 2018-02
Impact to retained earnings from adoption of ASU 2016-16 and ASU 2018-02
Retained Earnings
Impact to retained earnings from adoption of ASU 2016-16 and ASU 2018-02
Accumulated Other Comprehensive Loss
Cumulative Effect, Period of Adoption, Adjusted Balance
Cumulative Effect, Period of Adoption, Adjusted Balance
Common Stock
Cumulative Effect, Period of Adoption, Adjusted Balance
Treasury Stock
Cumulative Effect, Period of Adoption, Adjusted Balance
Additional Paid-in Capital
Cumulative Effect, Period of Adoption, Adjusted Balance
Retained Earnings
Cumulative Effect, Period of Adoption, Adjusted Balance
Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Dec. 31, 2017   212.0 2.3               212.0 2.3      
Beginning balance at Dec. 31, 2017 $ 2,956.2 $ 212.0 $ (252.1) $ 1,166.9 $ 1,962.1 $ (132.7) $ 2.6 $ 10.4 $ (7.8) $ 2,958.8 $ 212.0 $ (252.1) $ 1,166.9 $ 1,972.5 $ (140.5)
Increase (Decrease) in Stockholders' Equity                              
Net income 722.2       722.2                    
Other comprehensive income (loss), net of tax 2.0         2.0                  
Common stock issued under equity plans, including tax benefits (in shares)   3.2                          
Common stock issued under equity plans 147.0 $ 3.2   143.8                      
Stock-based compensation expense 71.0     71.0                      
Stock issued in payment for contingent consideration liabilities (in shares)     (0.3)                        
Shares issued in payment for contingent consideration liabilities 34.9   $ 32.2 2.7                      
Purchases of treasury stock (in shares)     5.5                        
Purchases of treasury stock (795.5)   $ (795.5)                        
Ending balance (in shares) at Dec. 31, 2018   215.2 7.5                        
Ending 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, including tax benefits (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, including tax benefits (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)