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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, 2015   239.1 23.7      
Beginning balance at Dec. 31, 2015 $ 2,503.1 $ 239.1 $ (1,837.0) $ 946.8 $ 3,336.8 $ (182.6)
Increase (Decrease) in Stockholders' Equity            
Net income 569.5       569.5  
Other comprehensive loss, net of tax (15.8)         (15.8)
Common stock issued under equity plans, including tax benefits (in shares)   3.5        
Common stock issued under equity plans, including tax benefits 167.6 $ 3.5   164.1    
Stock-based compensation expense 56.9     56.9    
Purchases of treasury stock (in shares)     7.3      
Purchases of treasury stock (662.3)   $ (662.3)      
Retirement of treasury stock     $ 0.0      
Ending balance (in shares) at Dec. 31, 2016   242.6 31.0      
Ending balance at Dec. 31, 2016 2,619.0 $ 242.6 $ (2,499.3) 1,167.8 3,906.3 (198.4)
Increase (Decrease) in Stockholders' Equity            
Impact to retained earnings from adoption of ASUs 9.3       9.3  
Adjusted beginning balance 2,628.3 $ 242.6 $ (2,499.3) 1,167.8 3,915.6 (198.4)
Net income 583.6       583.6  
Other comprehensive loss, net of tax 65.7         65.7
Common stock issued under equity plans, including tax benefits (in shares)   3.0        
Common stock issued under equity plans, including tax benefits 113.8 $ 3.0   110.8    
Stock-based compensation expense 61.6     61.6    
Stock issued to acquire business (in shares)     (2.8)      
Shares issued in payment for contingent consideration liabilities 266.5   $ 264.3 2.2    
Purchases of treasury stock (in shares)     7.7      
Purchases of treasury stock (763.3)   $ (763.3)      
Retirement of treasury stock (in shares)   (33.6) (33.6)      
Retirement of treasury stock 0.0 $ (33.6) $ 2,746.2 (175.5) (2,537.1)  
Ending balance (in shares) at Dec. 31, 2017   212.0 2.3      
Ending balance at Dec. 31, 2017 2,956.2 $ 212.0 $ (252.1) 1,166.9 1,962.1 (132.7)
Increase (Decrease) in Stockholders' Equity            
Net income 722.2       722.2  
Other comprehensive 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, including tax benefits 147.0 $ 3.2   143.8    
Stock-based compensation expense 71.0     71.0    
Stock issued to acquire business (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)      
Retirement of treasury stock     $ 0.0      
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)