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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)   1.3        
Issuance of common stock under equity incentive plans 1.1   1.1      
Issuance of common stock for Employee Stock Purchase Plan (in shares)   0.1        
Issuance of common stock for Employee Stock Purchase Plan 4.1   4.1      
Share-based compensation expense 50.2   50.2      
Net income (loss) 6.0       6.0  
Net loss 1.3     1.3    
Ending Balance (in shares) at Jun. 30, 2018   88.4        
Ending Balance at Jun. 30, 2018 482.1 $ 0.1 1,149.1 (1.3) (665.8) 0.0
Beginning Balance (in shares) at Mar. 31, 2018   88.1        
Beginning Balance at Mar. 31, 2018 421.7 $ 0.1 1,122.5 (4.9) (696.0) 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 1.0   1.0      
Issuance of common stock for Employee Stock Purchase Plan 0.0          
Share-based compensation expense 25.6   25.6      
Net income (loss) 30.2       30.2  
Net loss 3.6     3.6    
Ending Balance (in shares) at Jun. 30, 2018   88.4        
Ending Balance at Jun. 30, 2018 482.1 $ 0.1 1,149.1 (1.3) (665.8) 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]            
Issuance of common stock under equity incentive plans (in shares)   1.1        
Issuance of common stock under equity incentive plans 0.3   0.3      
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 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 54.7   54.7      
Net income (loss) (37.4)       (37.4)  
Net loss 0.5     0.5    
Ending Balance (in shares) at Jun. 30, 2019   91.2        
Ending Balance at Jun. 30, 2019 688.3 $ 0.1 1,620.4 2.0 (834.2) (100.0)
Beginning Balance (in shares) at Mar. 31, 2019   91.0        
Beginning Balance at Mar. 31, 2019 668.6 $ 0.1 1,590.6 1.6 (823.7) (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 0.1   0.1      
Issuance of common stock for Employee Stock Purchase Plan (in shares)   0.0        
Issuance of common stock for Employee Stock Purchase Plan 0.0   0.0      
Share-based compensation expense 29.7   29.7      
Net income (loss) (10.5)       (10.5)  
Net loss 0.4     0.4    
Ending Balance (in shares) at Jun. 30, 2019   91.2        
Ending Balance at Jun. 30, 2019 $ 688.3 $ 0.1 $ 1,620.4 $ 2.0 $ (834.2) $ (100.0)