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Stockholders' Equity - Convertible Preferred Stock and Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Mar. 26, 2018
Dec. 31, 2018
Dec. 31, 2017
Mar. 27, 2018
Class of Stock [Line Items]        
Preferred stock, shares authorized (in shares)   240,000,000 0  
Preferred stock, shares outstanding (in shares)   0 0  
Preferred stock, per share price at issuance (in dollars per share)       $ 21.00
Class A common stock        
Class of Stock [Line Items]        
Shares issued in conversion (in shares)   0    
Class B common stock        
Class of Stock [Line Items]        
Shares converted in conversion (in shares)   157,000,000    
Convertible preferred stock        
Class of Stock [Line Items]        
Preferred stock, shares authorized (in shares)   0 151,200,000.0  
Preferred stock, shares outstanding (in shares)   0 147,600,000  
Aggregate liquidation preference     $ 624.7  
Series A Convertible Preferred Stock        
Class of Stock [Line Items]        
Preferred stock, shares authorized (in shares)     63,900,000  
Preferred stock, shares outstanding (in shares)     63,900,000  
Preferred stock, per share price at issuance (in dollars per share)     $ 0.09  
Aggregate liquidation preference     $ 6.0  
Preferred stock, dividend per share amount (in dollars per share)     $ 0.02  
Series A-1 Convertible Preferred Stock        
Class of Stock [Line Items]        
Preferred stock, shares authorized (in shares)     52,000,000  
Preferred stock, shares outstanding (in shares)     51,900,000  
Preferred stock, per share price at issuance (in dollars per share)     $ 0.03  
Aggregate liquidation preference     $ 1.3  
Preferred stock, dividend per share amount (in dollars per share)     $ 0.02  
Series B Convertible Preferred Stock        
Class of Stock [Line Items]        
Preferred stock, shares authorized (in shares)     19,500,000  
Preferred stock, shares outstanding (in shares)     19,500,000  
Preferred stock, per share price at issuance (in dollars per share)     $ 13.58  
Aggregate liquidation preference     $ 264.8  
Preferred stock, dividend per share amount (in dollars per share)     $ 1.08  
Series C Convertible Preferred Stock        
Class of Stock [Line Items]        
Preferred stock, shares authorized (in shares)     15,800,000  
Preferred stock, shares outstanding (in shares)     12,300,000  
Preferred stock, per share price at issuance (in dollars per share)     $ 28.65  
Aggregate liquidation preference     $ 352.6  
Preferred stock, dividend per share amount (in dollars per share)     $ 2.30  
Conversion of Convertible Preferred Stock to Class B Common Stock | Class B common stock        
Class of Stock [Line Items]        
Shares issued in conversion (in shares) 147,310,563      
Conversion of Convertible Preferred Stock to Class B Common Stock | Convertible preferred stock        
Class of Stock [Line Items]        
Shares converted in conversion (in shares) 147,310,563      
Conversion of Convertible Preferred Stock to Class A Common Stock | Class A common stock        
Class of Stock [Line Items]        
Shares issued in conversion (in shares) 258,620      
Conversion of Convertible Preferred Stock to Class A Common Stock | Convertible preferred stock        
Class of Stock [Line Items]        
Shares converted in conversion (in shares) 258,620