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v3.20.2

Convertible Senior Notes (Details) | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 31, 2020 USD ($) shares | Apr. 30, 2019 USD ($) | Apr. 30, 2018 USD ($) day | Sep. 30, 2020 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Mar. 31, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Net proceeds |  |  |  | $ 984,096,000 | $ 780,180,000 |  |
Repayments of convertible senior notes |  |  |  | 159,677,000 | 0 |  |
Gain (loss) on extinguishment of debt |  |  |  | (3,315,000) | 0 |  |
Proceeds from exercise of convertible senior notes capped call |  |  |  | $ 57,414,000 | $ 0 |  |
Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  |  |  | $ 71.44 |  |  |
Senior Notes | 0% Convertible Senior Notes Due 2026 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Face value | $ 1,000,000,000.0 |  |  | $ 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 |  |  |  |  |  |
Debt instrument, equity component | $ 241,300,000 |  |  | $ 237,462,000 |  |  |
Conversion ratio | 0.0092978 |  |  |  |  |  |
Conversion price | $ / shares |  |  |  | $ 107.55 |  |  |
Debt instrument, remaining useful life |  |  |  | 5 years 10 months 24 days |  |  |
Debt conversion, converted instrument, amount |  |  |  | $ 664,200,000 |  |  |
Debt instrument, if-converted value less than principal |  |  |  | (335,800,000) |  |  |
Interest rate, effective percentage |  | 4.63% |  |  |  |  |
Debt issuance costs | $ (15,900,000) |  |  | $ (11,842,000) |  |  |
Senior Notes | 0% Convertible Senior Notes Due 2026 | Debt Instrument, Liability Component |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt issuance costs | (12,100,000) |  |  |  |  |  |
Senior Notes | 0% Convertible Senior Notes Due 2026 | Debt Instrument, Equity Component |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt issuance costs | (3,800,000) |  |  |  |  |  |
Senior Notes | 0% Convertible Senior Notes Due 2026 | Carrying Amount |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Convertible senior notes | 758,700,000 |  |  |  |  |  |
Senior Notes | 0% Convertible Senior Notes Due 2026 | Capped Call |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Net proceeds | 103,400,000 |  |  |  |  |  |
Debt instrument, convertible (in shares) | shares |  |  |  | 9,297,800 |  |  |
Conversion price | $ / shares |  |  |  | $ 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 |  | $ 800,000,000 |  | $ 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 |  |  |  |  |
Debt instrument, equity component |  | $ 212,000,000.0 |  | $ 206,747,000 |  | 206,747,000 |
Conversion ratio |  | 0.0193956 |  |  |  |  |
Conversion price | $ / shares |  |  |  | $ 51.56 |  |  |
Debt instrument, remaining useful life |  |  |  | 4 years 6 months |  |  |
Debt conversion, converted instrument, amount |  |  |  | $ 1,108,500,000 |  |  |
Debt instrument, if-converted value in excess of principal |  |  |  | 308,500,000 |  |  |
Interest rate, effective percentage |  | 5.40% |  |  |  |  |
Debt issuance costs |  | $ (19,800,000) |  | $ (10,862,000) |  | (12,691,000) |
Senior Notes | 0.125% Convertible Senior Notes Due 2025 | Debt Instrument, Liability Component |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt issuance costs |  | (14,600,000) |  |  |  |  |
Senior Notes | 0.125% Convertible Senior Notes Due 2025 | Debt Instrument, Equity Component |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt issuance costs |  | (5,300,000) |  |  |  |  |
Senior Notes | 0.125% Convertible Senior Notes Due 2025 | Carrying Amount |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Convertible senior notes |  | 588,000,000.0 |  |  |  |  |
Senior Notes | 0.125% Convertible Senior Notes Due 2025 | Capped Call |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Net proceeds |  | $ 97,200,000 |  |  |  |  |
Debt instrument, convertible (in shares) | shares |  |  |  | 15,516,480 |  |  |
Conversion price | $ / shares |  |  |  | $ 79.32 |  |  |
Senior Notes | 0.25% Convertible Senior Notes Due 2023 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Face value |  |  | $ 345,000,000 | $ 173,018,000 |  | 345,000,000 |
Interest rate, stated percentage |  |  | 0.25% |  |  |  |
Proceeds from issuance of debt |  |  | $ 345,000,000 |  |  |  |
Less initial purchasers’ discount |  |  | (8,625,000) |  |  |  |
Less other issuance costs |  |  | (757,000) |  |  |  |
Net proceeds |  |  | 335,618,000 |  |  |  |
Option to purchase additional notes |  |  | 45,000,000 |  |  |  |
Repurchased principal amount | 172,000,000.0 |  |  |  |  |  |
Aggregate consideration for principal amount exchanged | 501,700,000 |  |  |  |  |  |
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 |  |  |  |  |  |
Convertible senior notes | 156,100,000 |  |  |  |  |  |
Debt instrument, equity component | 345,600,000 |  | $ 64,200,000 | $ 31,316,000 |  | 62,444,000 |
Carrying amount | 152,800,000 |  |  |  |  |  |
Gain (loss) on extinguishment of debt | $ (3,300,000) |  |  |  |  |  |
Conversion ratio |  |  | 0.0371051 |  |  |  |
Conversion price | $ / shares |  |  |  | $ 26.95 |  |  |
Debt instrument, remaining useful life |  |  |  | 2 years 7 months 6 days |  |  |
Debt conversion, converted instrument, amount |  |  |  | $ 458,600,000 |  |  |
Debt instrument, if-converted value in excess of principal |  |  |  | 285,600,000 |  |  |
Interest rate, effective percentage |  |  | 4.34% |  |  |  |
Debt issuance costs |  |  | $ (9,400,000) | $ (1,960,000) |  | $ (5,028,000) |
Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Debt Instrument, Liability Component |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt issuance costs |  |  | (7,600,000) |  |  |  |
Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Debt Instrument, Equity Component |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt issuance costs |  |  | (1,700,000) |  |  |  |
Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Carrying Amount |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Convertible senior notes |  |  | $ 280,800,000 |  |  |  |
Senior Notes | 0.25% Convertible Senior Notes Due 2023 | 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 | 0.25% Convertible Senior Notes Due 2023 | 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 | 0.25% Convertible Senior Notes Due 2023 | 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 | 0.25% Convertible Senior Notes Due 2023 | Capped Call |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Net proceeds |  |  | $ 39,200,000 |  |  |  |
Debt instrument, convertible, shares terminated (in shares) | shares | 6,380,815 |  |  |  |  |  |
Proceeds from exercise of convertible senior notes capped call | $ 57,400,000 |  |  |  |  |  |
Debt instrument, convertible (in shares) | shares |  |  |  | 6,419,850 |  |  |
Conversion price | $ / shares |  |  |  | $ 40.68 |  |  |

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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
Name: | us-gaap_LongTermDebtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash outflow from the repayment of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Price of a single share of a number of saleable stocks of a company. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |