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v3.21.2

Convertible Senior Notes - Additional Information (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 31, 2021 USD ($) shares | Aug. 31, 2020 USD ($) | Apr. 30, 2019 USD ($) | Apr. 30, 2018 USD ($) day | Sep. 30, 2021 USD ($) $ / shares | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) shares | Mar. 31, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of convertible senior notes |  |  |  |  |  |  | $ 300,755,000 | $ 159,677,000 |  |
Equity component on conversions of 2023 notes and 2025 notes |  |  |  |  |  | $ 237,462,000 | (236,920,000) | 237,462,000 |  |
Proceeds from exercise of convertible senior notes capped call |  |  |  |  |  |  | 69,005,000 | 57,414,000 |  |
Loss on early extinguishment of debt |  |  |  |  | $ 0 | $ 3,315,000 | 78,152,000 | $ 3,315,000 |  |
Senior Notes | Sale Price Is Greater Or Equal 130% |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Threshold trading days | day |  |  |  | 20 |  |  |  |  |  |
Threshold consecutive trading days | day |  |  |  | 30 |  |  |  |  |  |
Threshold percentage of stock price trigger |  |  |  | 130.00% |  |  |  |  |  |
Senior Notes | Trading Price Per $1,000 Principal Amount Less Than 98% |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Threshold trading days | day |  |  |  | 5 |  |  |  |  |  |
Threshold consecutive trading days | day |  |  |  | 10 |  |  |  |  |  |
Senior Notes | Trading Price Per $1,000 Principal Amount Less Than 98% | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Threshold percentage of stock price trigger |  |  |  | 98.00% |  |  |  |  |  |
Senior Notes | Fundamental Change Scenario |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Threshold percentage of stock price trigger |  |  |  | 100.00% |  |  |  |  |  |
Senior Notes | 2026 Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face value |  | $ 1,000,000,000 |  |  | $ 1,000,000,000 |  | $ 1,000,000,000 |  | $ 1,000,000,000 |
Interest rate, stated percentage |  | 0.00% |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  | $ 1,000,000,000 |  |  |  |  |  |  |  |
Conversion ratio |  | 0.0092978 |  |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  |  |  |  | $ 107.55 |  | $ 107.55 |  |  |
Senior Notes | 2026 Notes | Capped Call |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  |  |  |  | $ 156.44 |  | $ 156.44 |  |  |
Senior Notes | 0% Convertible Senior Notes Due 2026, Additional Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face value |  | $ 100,000,000 |  |  |  |  |  |  |  |
Senior Notes | 2025 Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face value |  |  | $ 100,000,000 |  | $ 699,989,000 |  | $ 699,989,000 |  | 800,000,000 | $ 700,000,000
Interest rate, stated percentage |  |  |  |  |  |  |  |  |  | 0.125%
Proceeds from issuance of debt |  |  | $ 800,000,000 |  |  |  |  |  |  |
Repurchased principal amount |  |  |  |  | $ 100,000,000 |  | 100,000,000 |  |  |
Repayments of convertible senior notes | $ 184,900,000 |  |  |  |  |  | $ 184,900,000 |  |  |
Carrying amount | 98,300,000 |  |  |  |  |  |  |  |  |
Debt extinguished | 100,000,000 |  |  |  |  |  |  |  |  |
Derivative liability | 176,500,000 |  |  |  |  |  |  |  |  |
Gain (loss) in change in fair value | (8,400,000) |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt | $ 78,200,000 |  |  |  |  |  |  |  |  |
Conversion ratio |  |  | 0.0193956 |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  |  |  |  | $ 51.56 |  | $ 51.56 |  |  |
Senior Notes | 2025 Notes | Capped Call |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, convertible, shares terminated (in shares) | shares | 1,939,560 |  |  |  |  |  |  |  |  |
Proceeds from exercise of convertible senior notes capped call | $ 23,900,000 |  |  |  |  |  |  |  |  |
Derivative liability | 22,600,000 |  |  |  |  |  |  |  |  |
Gain (loss) in change in fair value | $ 1,300,000 |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  |  |  |  | $ 79.32 |  | $ 79.32 |  |  |
Senior Notes | 2023 Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face value |  |  |  | $ 345,000,000 |  |  |  |  | 115,576,000 |
Interest rate, stated percentage |  |  |  | 0.25% |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  | $ 345,000,000 |  |  |  |  |  |
Option to purchase additional notes |  |  |  | $ 45,000,000 |  |  |  |  |  |
Repurchased principal amount |  |  |  |  | $ 115,600,000 |  | $ 115,600,000 |  |  |
Aggregate consideration |  |  |  |  |  |  | 351,100,000 |  |  |
Repayments of convertible senior notes |  |  |  |  |  |  | $ 115,600,000 |  |  |
Debt conversion, shares issued (in shares) | shares |  |  |  |  |  |  | 2,983,011 |  |  |
Debt conversion, shares issued, value |  |  |  |  |  |  | $ 235,500,000 |  |  |
Carrying amount |  |  |  |  | $ 114,200,000 |  | 114,200,000 |  |  |
Equity component on conversions of 2023 notes and 2025 notes |  |  |  |  |  |  | $ 236,900,000 |  |  |
Conversion ratio |  |  |  | 0.0371051 |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  |  |  |  | $ 26.95 |  | $ 26.95 |  |  |
Senior Notes | 2023 Notes | Requests For Conversions |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repurchased principal amount |  |  |  |  | $ 24,700,000 |  | $ 24,700,000 |  |  |
Senior Notes | 2023 Notes | Election Of Option To Redeem Outstanding Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repurchased principal amount |  |  |  |  | $ 90,900,000 |  | $ 90,900,000 |  |  |
Senior Notes | 2023 Notes | Capped Call |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, convertible, shares terminated (in shares) | shares |  |  |  |  |  |  | 4,288,459 |  |  |
Proceeds from exercise of convertible senior notes capped call |  |  |  |  |  |  | $ 45,200,000 |  |  |
Senior Notes | 2023 Notes | Exchange Of Aggregate Principal Amount |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repurchased principal amount |  |  |  |  |  |  |  |  | 172,000,000 |
Repayments of convertible senior notes |  |  |  |  |  |  |  |  | $ 174,600,000 |
Debt conversion, shares issued (in shares) | shares |  |  |  |  |  |  |  |  | 4,182,320 |
Debt conversion, shares issued, value |  |  |  |  |  |  |  |  | $ 327,100,000 |
Aggregate consideration for principal amount exchanged |  |  |  |  |  |  |  |  | $ 501,700,000 |

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