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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Millions
Total
Cumulative-effect adjustment to equity due to adoption of ASU 2016-02
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Accumulated Deficit
Cumulative-effect adjustment to equity due to adoption of ASU 2016-02
Beginning balance (in shares) at Dec. 31, 2017     88,800,000        
Beginning balance at Dec. 31, 2017 $ 372.2   $ 0.1 $ 1,572.8 $ (1.9) $ (1,198.8)  
Net income 21.1         21.1  
Unrealized gain (loss) on debt securities available-for sale (0.1)       (0.1)    
Share-based compensation expense $ 58.1     58.1      
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201602Member            
Issuance of common stock for vested restricted stock units (in shares)     400,000        
Issuance of common stock for stock option exercises (in shares)     1,600,000        
Issuance of common stock for stock option exercises $ 29.5     29.5      
Ending balance (in shares) at Dec. 31, 2018     90,800,000        
Ending balance at Dec. 31, 2018 480.8 $ 8.0 $ 0.1 1,660.4 (2.0) (1,177.7) $ 8.0
Net income 37.0         37.0  
Unrealized gain (loss) on debt securities available-for sale 3.4       3.4    
Share-based compensation expense 75.3     75.3      
Issuance of common stock for vested restricted stock units (in shares)     400,000        
Issuance of common stock for stock option exercises (in shares)     1,000,000.0        
Issuance of common stock for stock option exercises 27.3     27.3      
Issuance of common stock for employee stock purchase plan (in shares)     100,000        
Issuance of common stock for employee stockpurchase plan 5.1     5.1      
Ending balance (in shares) at Dec. 31, 2019     92,300,000        
Ending balance at Dec. 31, 2019 636.9   $ 0.1 1,768.1 1.4 (1,132.7)  
Net income 407.3         407.3  
Unrealized gain (loss) on debt securities available-for sale 0.4       0.4    
Share-based compensation expense 100.0     100.0      
Equity component of repurchased convertible senior notes, net $ (47.5)     (47.5)      
Issuance of common stock for vested restricted stock units (in shares)     500,000        
Issuance of common stock for stock option exercises (in shares) 600,000   600,000        
Issuance of common stock for stock option exercises $ 23.5     23.5      
Issuance of common stock for employee stock purchase plan (in shares)     100,000        
Issuance of common stock for employee stockpurchase plan 5.6     5.6      
Ending balance (in shares) at Dec. 31, 2020     93,500,000        
Ending balance at Dec. 31, 2020 $ 1,126.2   $ 0.1 $ 1,849.7 $ 1.8 $ (725.4)