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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
shares in Millions, $ in Millions
Total
Cumulative Effect, Period of Adoption, Adjustment
Common Stock
Additional Paid-In Capital
Additional Paid-In Capital
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Accumulated Deficit
Cumulative Effect, Period of Adoption, Adjustment
Beginning Balance (in shares) at Dec. 31, 2020     93.5          
Beginning Balance at Dec. 31, 2020 $ 1,126.2   $ 0.1 $ 1,849.7   $ 1.8 $ (725.4)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 32.1           32.1  
Unrealized gain (loss) on debt securities available-for-sale, net of tax (0.8)         (0.8)    
Stock-based compensation expense 32.9     32.9        
Issuances of common stock under stock plans (in shares)     1.0          
Issuances of common stock under stock plans 15.2     15.2        
Ending Balance (in shares) at Mar. 31, 2021     94.5          
Ending Balance at Mar. 31, 2021 1,205.6   $ 0.1 1,897.8   1.0 (693.3)  
Beginning Balance (in shares) at Dec. 31, 2021     94.9          
Beginning Balance at Dec. 31, 2021 1,374.0 $ (32.3) $ 0.1 2,011.4 $ (106.8) (1.7) (635.8) $ 74.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 13.9           13.9  
Unrealized gain (loss) on debt securities available-for-sale, net of tax (7.6)         (7.6)    
Stock-based compensation expense 37.0     37.0        
Issuances of common stock under stock plans (in shares)     0.6          
Issuances of common stock under stock plans 6.1     6.1        
Ending Balance (in shares) at Mar. 31, 2022     95.5          
Ending Balance at Mar. 31, 2022 $ 1,391.1   $ 0.1 $ 1,947.7   $ (9.3) $ (547.4)