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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
shares in Millions, $ in Millions
Total
Convertible preferred stock
Class A and Class B common stock
Additional paid-in capital
Accumulated deficit
Accumulated other comprehensive income (loss)
Shares outstanding, beginning of the period (in shares) at Dec. 31, 2017   147.6 196.8      
Shareholders equity, beginning balance at Dec. 31, 2017 $ 102.9 $ 615.3 $ 0.0 $ 533.1 $ (1,049.7) $ 4.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Release of restricted stock units (in shares)     30.6      
Release of restricted stock units 0.0          
Shares repurchased for tax withholdings on release of restricted stock (in shares)     (11.8)      
Shares repurchased for tax withholdings on release of restricted stock (247.3)     (162.1) (85.2)  
Conversion of preferred stock to common stock in connection with initial public offering (in shares)   (147.6) 147.6      
Conversion of preferred stock to common stock in connection with initial public offering 0.0 $ (615.3)   615.3    
Issuance of common stock in connection with initial public offering and private placement, net of underwriters' discounts and commissions and issuance costs (in shares)     31.6      
Issuance of common stock in connection with initial public offering and private placement, net of underwriters' discounts and commissions and issuance costs 631.3     631.3    
Exercise of stock options and awards (in shares)     0.2      
Exercise of stock options and awards 0.8     0.8    
Stock-based compensation 486.5     486.5    
Other comprehensive income 1.4         1.4
Net loss (465.5)       (465.5)  
Shares outstanding, end of the period (in shares) at Mar. 31, 2018   0.0 395.0      
Shareholders equity, ending balance at Mar. 31, 2018 510.1 $ 0.0 $ 0.0 2,104.9 (1,600.4) 5.6
Shares outstanding, beginning of the period (in shares) at Dec. 31, 2018   0.0 409.6      
Shareholders equity, beginning balance at Dec. 31, 2018 676.8 $ 0.0 $ 0.0 2,337.5 (1,659.5) (1.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Release of restricted stock units (in shares)     2.6      
Release of restricted stock units $ 0.0          
Shares repurchased for tax withholdings on release of restricted stock (in shares) (1.0)   (1.0)      
Shares repurchased for tax withholdings on release of restricted stock $ (25.5)     (17.0) (8.5)  
Exercise of stock options and awards (in shares) 0.2   0.2      
Exercise of stock options and awards $ 0.9     0.9    
Assumed stock options in connection with acquisition 0.8     0.8    
Stock-based compensation 55.6     55.6    
Other comprehensive income 3.0         3.0
Net loss (7.7)          
Net loss | Accounting Standards Update 2016-02 (7.7)          
Shares outstanding, end of the period (in shares) at Mar. 31, 2019   0.0 411.4      
Shareholders equity, ending balance at Mar. 31, 2019 $ 704.9 $ 0.0 $ 0.0 $ 2,377.8 $ (1,674.7) $ 1.8