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Condensed 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
Beginning Balance (in shares) at Dec. 31, 2019   92.3      
Beginning Balance at Dec. 31, 2019 $ 636.9 $ 0.1 $ 1,768.1 $ 1.4 $ (1,132.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 59.4       59.4
Unrealized gain (loss) on debt securities available-for-sale, net of tax 1.8     1.8  
Share-based compensation expense 79.0   79.0    
Issuances of common stock under stock plans (in shares)   1.1      
Issuances of common stock under stock plans 27.2   27.2    
Ending Balance (in shares) at Sep. 30, 2020   93.4      
Ending Balance at Sep. 30, 2020 804.3 $ 0.1 1,874.3 3.2 (1,073.3)
Beginning Balance (in shares) at Jun. 30, 2020   93.2      
Beginning Balance at Jun. 30, 2020 831.2 $ 0.1 1,842.2 4.6 (1,015.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (57.6)       (57.6)
Unrealized gain (loss) on debt securities available-for-sale, net of tax (1.4)     (1.4)  
Share-based compensation expense 26.7   26.7    
Issuances of common stock under stock plans (in shares)   0.2      
Issuances of common stock under stock plans 5.4   5.4    
Ending Balance (in shares) at Sep. 30, 2020   93.4      
Ending Balance at Sep. 30, 2020 804.3 $ 0.1 1,874.3 3.2 (1,073.3)
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 96.9       96.9
Unrealized gain (loss) on debt securities available-for-sale, net of tax (1.4)     (1.4)  
Share-based compensation expense 98.6   98.6    
Issuances of common stock under stock plans (in shares)   1.3      
Issuances of common stock under stock plans 25.7   25.7    
Ending Balance (in shares) at Sep. 30, 2021   94.8      
Ending Balance at Sep. 30, 2021 1,346.0 $ 0.1 1,974.0 0.4 (628.5)
Beginning Balance (in shares) at Jun. 30, 2021   94.6      
Beginning Balance at Jun. 30, 2021 1,279.2 $ 0.1 1,929.4 0.7 (651.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 22.5       22.5
Unrealized gain (loss) on debt securities available-for-sale, net of tax (0.3)     (0.3)  
Share-based compensation expense 37.1   37.1    
Issuances of common stock under stock plans (in shares)   0.2      
Issuances of common stock under stock plans 7.5   7.5    
Ending Balance (in shares) at Sep. 30, 2021   94.8      
Ending Balance at Sep. 30, 2021 $ 1,346.0 $ 0.1 $ 1,974.0 $ 0.4 $ (628.5)