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Convertible Senior Notes - Summary of Capped Calls (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 1 Months Ended
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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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