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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
Total 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 249.7       249.7  
Other comprehensive income, net of tax (2.7)         (2.7)
Common stock issued under equity plans (in shares)   0.8        
Common stock issued under equity plans 45.0 $ 0.8   44.2    
Stock-based compensation expense 20.8     20.8    
Purchases of treasury stock (in shares)     0.1      
Purchases of treasury stock (5.7)   $ (5.7)      
Ending balance (in shares) at Mar. 31, 2019   216.0 7.6      
Ending balance at Mar. 31, 2019 3,447.5 $ 216.0 $ (1,021.1) 1,449.4 2,944.4 (141.2)
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 equity plans (in shares)   0.4        
Common stock issued under equity 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)