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Debt - Senior Convertible Notes (Details) - USD ($) | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019 | May 31, 2020 | Nov. 30, 2018 | Jun. 30, 2017
Debt Instrument [Line Items] |  |  |  |  |
Carrying amount of liability component | $ 1,658,800,000 | $ 1,059,700,000 |  |  |
Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount | 2,094,700,000 | 1,250,000,000.0 |  |  |
Unamortized debt discount | (414,200,000) | (177,200,000) |  |  |
Unamortized debt issuance costs | (21,700,000) | (13,100,000) |  |  |
Carrying amount of liability component | 1,658,800,000 | 1,059,700,000 |  |  |
Carrying amount of equity component | 467,700,000 | 242,200,000 |  |  |
Senior Notes | Senior Convertible Notes due 2022 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount | 37,200,000 | $ 400,000,000.0 | $ 260,000,000.0 |  | $ 400,000,000.0
Unamortized debt discount | (2,800,000) |  |  |  |
Unamortized debt issuance costs | $ (300,000) |  |  |  |
Remaining amortization period of debt discount on the liability component | 1 year 10 months 24 days | 2 years 6 months |  |  |
Senior Notes | Senior Convertible Notes due 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount | $ 850,000,000.0 | $ 850,000,000.0 |  | $ 850,000,000.0 |
Remaining amortization period of debt discount on the liability component | 3 years 4 months 24 days | 4 years |  |  |
Senior Notes | Senior Convertible Notes due 2025 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount | $ 1,207,500,000 | $ 0 | $ 1,210,000,000 |  |
Remaining amortization period of debt discount on the liability component | 5 years 4 months 24 days |  |  |  |

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- Definition Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Convertible Notes Payable, excluding current portion. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031898-161870 + Details
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