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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)
Net income 117.0       117.0
Unrealized gain (loss) on debt securities available-for-sale, net of tax 3.2     3.2  
Share-based compensation expense 52.3   52.3    
Issuances of common stock under stock plans (in shares)   0.9      
Issuances of common stock under stock plans 21.8   21.8    
Ending Balance (in shares) at Jun. 30, 2020   93.2      
Ending Balance at Jun. 30, 2020 831.2 $ 0.1 1,842.2 4.6 (1,015.7)
Beginning Balance (in shares) at Mar. 31, 2020   92.8      
Beginning Balance at Mar. 31, 2020 700.3 $ 0.1 1,796.9 (1.4) (1,095.3)
Net income 79.6       79.6
Unrealized gain (loss) on debt securities available-for-sale, net of tax 6.0     6.0  
Share-based compensation expense 29.5   29.5    
Issuances of common stock under stock plans (in shares)   0.4      
Issuances of common stock under stock plans 15.8   15.8    
Ending Balance (in shares) at Jun. 30, 2020   93.2      
Ending Balance at Jun. 30, 2020 831.2 $ 0.1 1,842.2 4.6 (1,015.7)
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)
Net income 74.4       74.4
Unrealized gain (loss) on debt securities available-for-sale, net of tax (1.1)     (1.1)  
Share-based compensation expense 61.5   61.5    
Issuances of common stock under stock plans (in shares)   1.1      
Issuances of common stock under stock plans 18.2   18.2    
Ending Balance (in shares) at Jun. 30, 2021   94.6      
Ending Balance at Jun. 30, 2021 1,279.2 $ 0.1 1,929.4 0.7 (651.0)
Beginning Balance (in shares) at Mar. 31, 2021   94.5      
Beginning Balance at Mar. 31, 2021 1,205.6 $ 0.1 1,897.8 1.0 (693.3)
Net income 42.3       42.3
Unrealized gain (loss) on debt securities available-for-sale, net of tax (0.3)     (0.3)  
Share-based compensation expense 28.6   28.6    
Issuances of common stock under stock plans (in shares)   0.1      
Issuances of common stock under stock plans 3.0   3.0    
Ending Balance (in shares) at Jun. 30, 2021   94.6      
Ending Balance at Jun. 30, 2021 $ 1,279.2 $ 0.1 $ 1,929.4 $ 0.7 $ (651.0)