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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Preferred stock, par value (in dollars per share) $ 0.00001 $ 0.00001
Preferred stock, shares authorized (in shares) 240,000,000 0
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.00001 $ 0.00001
Convertible preferred stock, $0.00001 par value; no shares authorized, issued and outstanding as of December 31, 2018; 151.2 shares authorized, 147.6 shares issued and outstanding with liquidation preference of $624.7 as of December 31, 2017    
Preferred stock, par value (in dollars per share) $ 0.00001 $ 0.00001
Preferred stock, shares authorized (in shares) 0 151,200,000.0
Preferred stock, shares issued (in shares) 0 147,600,000
Preferred stock, shares outstanding (in shares) 0 147,600,000
Preferred stock, liquidation preference value   $ 624.7
Class A common stock    
Common stock, par value (in dollars per share) $ 0.00001  
Common stock, shares authorized (in shares) 2,400,000,000.0 533,300,000.0
Common stock, shares issued (in shares) 211,000,000 8,900,000
Common stock, shares outstanding (in shares) 211,000,000 8,900,000
Class B common stock    
Common stock, par value (in dollars per share) $ 0.00001  
Common stock, shares authorized (in shares) 475,000,000.0 466,700,000.0
Common stock, shares issued (in shares) 198,600,000 187,900,000
Common stock, shares outstanding (in shares) 198,600,000 187,900,000
Class C common stock    
Common stock, par value (in dollars per share) $ 0.00001  
Common stock, shares authorized (in shares) 800,000,000.0 0
Common stock, shares issued (in shares) 0 0
Common stock, shares outstanding (in shares) 0 0