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Debt - Senior Convertible Notes (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Nov. 30, 2018 | Jun. 30, 2017
Senior Convertible Notes |  |  |  |
Net carrying amount of Senior Convertible Notes | $ 1,059,700,000 | $ 1,010,300,000 |  |
Senior Notes |  |  |  |
Senior Convertible Notes |  |  |  |
Total net carrying amount of senior convertible notes | 1,059,700,000 | 1,010,300,000 |  |
Senior Notes | Senior convertible notes due 2022 |  |  |  |
Senior Convertible Notes |  |  |  |
Principal amount | 400,000,000.0 | 400,000,000.0 |  | $ 400,000,000.0
Unamortized debt discount | (37,200,000) | (51,100,000) |  |
Unamortized debt issuance costs | (4,600,000) | (6,300,000) |  |
Net carrying amount of Senior Convertible Notes | 358,200,000 | 342,600,000 |  |
Interest rate on convertible notes (as a percent) |  |  |  | 0.75%
Carrying value of equity component of convertible senior notes, net of debt issuance costs | $ 70,600,000 | $ 70,600,000 |  |
Remaining amortization period of debt discount on the liability component | 2 years 6 months | 3 years 6 months |  |
Senior Notes | Senior convertible notes due 2023 |  |  |  |
Senior Convertible Notes |  |  |  |
Principal amount | $ 850,000,000.0 | $ 850,000,000.0 | $ 850,000,000.0 |
Unamortized debt discount | (140,000,000.0) | (171,800,000) |  |
Unamortized debt issuance costs | (8,500,000) | (10,500,000) |  |
Net carrying amount of Senior Convertible Notes | 701,500,000 | 667,700,000 |  |
Interest rate on convertible notes (as a percent) |  |  | 0.75% | 0.75%
Carrying value of equity component of convertible senior notes, net of debt issuance costs | $ 171,600,000 | $ 171,600,000 |  |
Remaining amortization period of debt discount on the liability component | 4 years | 5 years |  |

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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=6877327&loc=d3e13212-122682 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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