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CONSOLIDATED CONDENSED 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, 2019   218.1 9.0      
Beginning 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 310.6       310.6  
Other comprehensive income, net of tax 4.0         4.0
Common stock issued under stock plans (in shares)   0.4        
Common stock issued under stock plans 29.1 $ 0.4   28.7    
Stock-based compensation expense 23.9     23.9    
Purchases of treasury stock (in shares)     3.0      
Purchases of treasury stock (614.8)   $ (614.8)      
Ending balance (in shares) at Mar. 31, 2020   218.5 12.0      
Ending balance at Mar. 31, 2020 3,901.1 $ 218.5 $ (1,893.5) 1,675.9 4,052.2 (152.0)
Beginning balance (in shares) at Dec. 31, 2020   636.4 12.1      
Beginning 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 338.2       338.2  
Other comprehensive income, net of tax (11.3)         (11.3)
Common stock issued under stock plans (in shares)   1.1        
Common stock issued under stock plans 31.6 $ 1.1   30.5    
Stock-based compensation expense 28.2     28.2    
Purchases of treasury stock (in shares)     3.6      
Purchases of treasury stock (302.6)   $ (302.6)      
Ending balance (in shares) at Mar. 31, 2021   637.5 15.7      
Ending balance at Mar. 31, 2021 $ 4,658.4 $ 637.5 $ (2,206.7) $ 1,496.8 $ 4,903.2 $ (172.4)