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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

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