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v3.21.2

Convertible Senior Notes (Details) | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 31, 2020 USD ($) | Apr. 30, 2019 USD ($) | Apr. 30, 2018 USD ($) | Jun. 30, 2021 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) day $ / shares shares | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Mar. 31, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Repayments of convertible senior notes |  |  |  |  |  | $ 300,751,000 | $ 0 |  |
Proceeds from exercise of convertible senior notes capped call |  |  |  |  |  | 69,004,000 | 0 |  |
Loss on early extinguishment of debt |  |  |  | $ 0 | $ 0 | 78,152,000 | $ 0 |  |
Equity component of convertible senior notes, net of issuance costs |  |  |  | (225,615,000) |  | (236,920,000) |  |  |
Equity component of convertible senior notes, net of issuance costs |  |  |  | (225,615,000) |  | $ (236,920,000) |  |  |
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 | 0% Convertible Senior Notes Due 2026 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face value | $ 1,000,000,000.0 |  |  | $ 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 |  |  |  |  |  |  |  |
Less initial purchasers’ discount | (15,000,000) |  |  |  |  |  |  |  |
Less other issuance costs | (904,000) |  |  |  |  |  |  |  |
Net proceeds | $ 984,096,000 |  |  |  |  |  |  |  |
Conversion ratio | 0.0092978 |  |  |  |  |  |  |  |
Conversion price | $ / shares |  |  |  | $ 107.55 |  | $ 107.55 |  |  |
Senior Notes | 0% Convertible Senior Notes Due 2026 | Capped Call |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Net proceeds | $ 103,400,000 |  |  |  |  |  |  |  |
Conversion price | $ / 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 | 0.125% Convertible Senior Notes Due 2025 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face value |  | $ 100,000,000 |  | $ 699,992,000 |  | $ 699,992,000 |  | 800,000,000 | $ 700,000,000
Interest rate, stated percentage |  |  |  |  |  |  |  |  | 0.125%
Proceeds from issuance of debt |  | 800,000,000 |  |  |  |  |  |  |
Less initial purchasers’ discount |  | (18,998,000) |  |  |  |  |  |  |
Less other issuance costs |  | (822,000) |  |  |  |  |  |  |
Net proceeds |  | $ 780,180,000 |  |  |  |  |  |  |
Repurchased principal amount |  |  |  | 100,000,000.0 |  | 100,000,000.0 |  |  |
Repayments of convertible senior notes |  |  |  |  |  | 184,900,000 |  |  |
Carrying amount |  |  |  | 98,300,000 |  | 98,300,000 |  |  |
Derivative liability |  |  |  | $ 176,500,000 |  | 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 | $ / shares |  |  |  | $ 51.56 |  | $ 51.56 |  |  |
Senior Notes | 0.125% Convertible Senior Notes Due 2025 | Capped Call |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Net proceeds |  | $ 97,200,000 |  |  |  |  |  |  |
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 |  | 22,600,000 |  |  |
Gain (loss) in change in fair value |  |  |  |  |  | $ 1,300,000 |  |  |
Conversion price | $ / shares |  |  |  | $ 79.32 |  | $ 79.32 |  |  |
Senior Notes | 0.25% Convertible Senior Notes Due 2023 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |
Less initial purchasers’ discount |  |  | (8,625,000) |  |  |  |  |  |
Less other issuance costs |  |  | (757,000) |  |  |  |  |  |
Net proceeds |  |  | $ 335,618,000 |  |  |  |  |  |
Conversion ratio |  |  | 0.0371051 |  |  |  |  |  |
Conversion price | $ / shares |  |  |  | $ 26.95 |  | $ 26.95 |  |  |
Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Settlement Of Principal During Three Months |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Repurchased principal amount |  |  |  | $ 110,900,000 |  | $ 110,900,000 |  |  |
Aggregate consideration |  |  |  | 335,200,000 |  |  |  |  |
Repayments of convertible senior notes |  |  |  | $ 110,900,000 |  |  |  |  |
Debt conversion, shares issued (in shares) | shares |  |  |  | 2,857,008 |  |  |  |  |
Debt conversion, shares issued, value |  |  |  | $ 224,300,000 |  |  |  |  |
Carrying amount |  |  |  | 109,600,000 |  | 109,600,000 |  |  |
Equity component of convertible senior notes, net of issuance costs |  |  |  | 225,600,000 |  |  |  |  |
Equity component of convertible senior notes, net of issuance costs |  |  |  | 225,600,000 |  |  |  |  |
Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Settlement Of Principal During Six Months |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
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 of convertible senior notes, net of issuance costs |  |  |  |  |  | 236,900,000 |  |  |
Equity component of convertible senior notes, net of issuance costs |  |  |  |  |  | $ 236,900,000 |  |  |
Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Capped Call | Settlement Of Principal During Three Months |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, convertible, shares terminated (in shares) | shares |  |  |  | 4,201,633 |  |  |  |  |
Proceeds from exercise of convertible senior notes capped call |  |  |  | $ 44,200,000 |  |  |  |  |
Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Capped Call | Settlement Of Principal During Six Months |  |  |  |  |  |  |  |  |
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 | 0.25% Convertible Senior Notes Due 2023 | Exchange Of Aggregate Principal Amount |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Repurchased principal amount |  |  |  |  |  |  |  | $ 172,000,000.0 |
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 |  |  |
Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Requests For Conversions |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Repurchased principal amount |  |  |  | 24,700,000 |  | 24,700,000 |  |  |
Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Election Of Option To Redeem Outstanding Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Repurchased principal amount |  |  |  | $ 90,900,000 |  | $ 90,900,000 |  |  |

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