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Convertible Senior Notes - Summary of Capped Calls (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended
Sep. 30, 2020
Mar. 31, 2020
Mar. 31, 2018
2023 Notes | Capped call      
Debt Instrument [Line Items]      
Initial approximate strike price per share, subject to certain adjustments (in dollars per share)     $ 81.45
Initial cap price per share, subject to certain adjustment (in dollars per share)     $ 119.04
Net cost incurred (in millions)     $ 49.9
2023 Notes | Capped call | Class A common stock      
Debt Instrument [Line Items]      
Class A common stock covered, subject to anti-dilution adjustments (in millions) (in shares)     5.6
2025 Notes | Class A common stock      
Debt Instrument [Line Items]      
Initial cap price per share, subject to certain adjustment (in dollars per share)   $ 360.43  
2025 Notes | Capped call      
Debt Instrument [Line Items]      
Initial approximate strike price per share, subject to certain adjustments (in dollars per share)   360.43  
Initial cap price per share, subject to certain adjustment (in dollars per share)   $ 480.56  
Net cost incurred (in millions)   $ 60.9  
2025 Notes | Capped call | Class A common stock      
Debt Instrument [Line Items]      
Class A common stock covered, subject to anti-dilution adjustments (in millions) (in shares)   2.8  
2026 Notes | Class A common stock      
Debt Instrument [Line Items]      
Initial cap price per share, subject to certain adjustment (in dollars per share) $ 424.03    
2026 Notes | Capped call      
Debt Instrument [Line Items]      
Initial approximate strike price per share, subject to certain adjustments (in dollars per share) 424.03    
Initial cap price per share, subject to certain adjustment (in dollars per share) $ 556.10    
Net cost incurred (in millions) $ 41.8    
2026 Notes | Capped call | Class A common stock      
Debt Instrument [Line Items]      
Class A common stock covered, subject to anti-dilution adjustments (in millions) (in shares) 1.5