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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Millions
Total
Cumulative Effect, Period of Adoption, Adjustment
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Accumulated Deficit
Cumulative Effect, Period of Adoption, Adjustment
Beginning balance (in shares) at Dec. 31, 2018     90,800,000        
Beginning 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      
Issuances of common stock under stock plans (in shares)     1,500,000        
Issuances of common stock under stock plans 32.4     32.4      
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      
Issuances of common stock under stock plans (in shares)     1,200,000        
Issuances of common stock under stock plans 29.1     29.1      
Equity component of repurchased convertible senior notes, net (47.5)     (47.5)      
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)  
Net income 89.6         89.6  
Unrealized gain (loss) on debt securities available-for sale (3.5)       (3.5)    
Share-based compensation expense $ 134.2     134.2      
Accounting Standards Update [Extensible List] Accounting Standards Update 2020-06 [Member]            
Issuances of common stock under stock plans (in shares)     1,400,000        
Issuances of common stock under stock plans $ 27.5     27.5      
Ending balance (in shares) at Dec. 31, 2021     94,900,000        
Ending balance at Dec. 31, 2021 $ 1,374.0   $ 0.1 $ 2,011.4 $ (1.7) $ (635.8)