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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Millions, $ in Millions
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Treasury Stock
Beginning Balance (in shares) at Dec. 31, 2017   87.0        
Beginning Balance at Dec. 31, 2017 $ 419.4 $ 0.1 $ 1,093.7 $ (2.6) $ (671.8) $ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under equity incentive plans (in shares)   1.6        
Issuance of common stock under equity incentive plans 1.7   1.7      
Issuance of common stock for Employee Stock Purchase Plan (in shares)   0.2        
Issuance of common stock for Employee Stock Purchase Plan 8.9   8.9      
Share-based compensation expense 77.3   77.3      
Net income 52.6       52.6  
Other comprehensive loss 2.3     2.3    
Ending Balance (in shares) at Sep. 30, 2018   88.8        
Ending Balance at Sep. 30, 2018 562.2 $ 0.1 1,181.6 (0.3) (619.2) 0.0
Beginning Balance (in shares) at Jun. 30, 2018   88.4        
Beginning Balance at Jun. 30, 2018 482.1 $ 0.1 1,149.1 (1.3) (665.8) 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under equity incentive plans (in shares)   0.3        
Issuance of common stock under equity incentive plans 0.6   0.6      
Issuance of common stock for Employee Stock Purchase Plan (in shares)   0.1        
Issuance of common stock for Employee Stock Purchase Plan 4.8   4.8      
Share-based compensation expense 27.1   27.1      
Net income 46.6       46.6  
Other comprehensive loss 1.0     1.0    
Ending Balance (in shares) at Sep. 30, 2018   88.8        
Ending Balance at Sep. 30, 2018 562.2 $ 0.1 1,181.6 (0.3) (619.2) 0.0
Beginning Balance (in shares) at Dec. 31, 2018   90.0        
Beginning Balance at Dec. 31, 2018 663.3 $ 0.1 1,560.6 1.5 (798.9) (100.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Cumulative-effect adjustment from adoption of new lease accounting standard (Note 2) 2.1          
Cumulative-effect adjustment from adoption of new lease accounting standard (Note 2) | Accounting Standards Update 2016-02         2.1  
Issuance of common stock under equity incentive plans (in shares)   1.3        
Issuance of common stock under equity incentive plans 0.3   0.3      
Issuance of common stock for Employee Stock Purchase Plan (in shares)   0.2        
Issuance of common stock for Employee Stock Purchase Plan 11.6   11.6      
Share-based compensation expense 79.1   79.1      
Net income 8.4       8.4  
Other comprehensive loss (0.5)     (0.5)    
Ending Balance (in shares) at Sep. 30, 2019   91.5        
Ending Balance at Sep. 30, 2019 764.3 $ 0.1 1,651.6 1.0 (788.4) (100.0)
Beginning Balance (in shares) at Jun. 30, 2019   91.2        
Beginning Balance at Jun. 30, 2019 688.3 $ 0.1 1,620.4 2.0 (834.2) (100.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under equity incentive plans (in shares)   0.2        
Issuance of common stock under equity incentive plans 0.0   0.0      
Issuance of common stock for Employee Stock Purchase Plan (in shares)   0.1        
Issuance of common stock for Employee Stock Purchase Plan 6.8   6.8      
Share-based compensation expense 24.4   24.4      
Net income 45.8       45.8  
Other comprehensive loss (1.0)     (1.0)    
Ending Balance (in shares) at Sep. 30, 2019   91.5        
Ending Balance at Sep. 30, 2019 $ 764.3 $ 0.1 $ 1,651.6 $ 1.0 $ (788.4) $ (100.0)