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Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
shares in Millions, $ in Millions
Total
Adjustment
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Accumulated Deficit
Adjustment
Treasury Stock
Balance at beginning of period (shares) at Dec. 31, 2018     90.0          
Balance at beginning of period at Dec. 31, 2018 $ 663.3 $ 2.1 $ 0.1 $ 1,560.6 $ 1.5 $ (798.9) $ 2.1 $ (100.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Issuance of common stock under equity incentive plans (shares)     1.3          
Issuance of common stock under equity incentive plans 0.3     0.3        
Issuance of common stock for Employee Stock Purchase Plan (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 income (loss), net of tax (0.5)       (0.5)      
Balance at end of period (shares) at Sep. 30, 2019     91.5          
Balance at end of period at Sep. 30, 2019 764.3   $ 0.1 1,651.6 1.0 (788.4)   (100.0)
Balance at beginning of period (shares) at Jun. 30, 2019     91.2          
Balance at beginning of period 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 (shares)     0.2          
Issuance of common stock for Employee Stock Purchase Plan (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 income (loss), net of tax (1.0)       (1.0)      
Balance at end of period (shares) at Sep. 30, 2019     91.5          
Balance at end of period at Sep. 30, 2019 764.3   $ 0.1 1,651.6 1.0 (788.4)   (100.0)
Balance at beginning of period (shares) at Dec. 31, 2019     91.6          
Balance at beginning of period at Dec. 31, 2019 882.6   $ 0.1 1,675.9 2.3 (695.7)   (100.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Issuance of common stock under equity incentive plans (shares)     1.0          
Issuance of common stock under equity incentive plans 0.3     0.3        
Issuance of common stock for Employee Stock Purchase Plan 15.0     15.0        
Equity component of 2025 Notes issuance, net of issuance costs 289.4     289.4        
Repurchase and conversions of 2022 Notes, net of tax (shares)     3.4          
Repurchase and conversions of 2022 Notes, net of tax 87.8     87.8        
Share-based compensation expense 85.3     85.3        
Net income 138.4         138.4    
Other comprehensive income (loss), net of tax 0.5       0.5      
Balance at end of period (shares) at Sep. 30, 2020     96.0          
Balance at end of period at Sep. 30, 2020 1,499.3   $ 0.1 2,153.7 2.8 (557.3)   (100.0)
Balance at beginning of period (shares) at Jun. 30, 2020     95.4          
Balance at beginning of period at Jun. 30, 2020 1,353.9   $ 0.1 2,079.8 3.5 (629.5)   (100.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Issuance of common stock under equity incentive plans (shares)     0.2          
Issuance of common stock for Employee Stock Purchase Plan 8.6     8.6        
Repurchase and conversions of 2022 Notes, net of tax (shares)     0.4          
Repurchase and conversions of 2022 Notes, net of tax 34.6     34.6        
Share-based compensation expense 30.7     30.7        
Net income 72.2         72.2    
Other comprehensive income (loss), net of tax (0.7)       (0.7)      
Balance at end of period (shares) at Sep. 30, 2020     96.0          
Balance at end of period at Sep. 30, 2020 $ 1,499.3   $ 0.1 $ 2,153.7 $ 2.8 $ (557.3)   $ (100.0)