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Debt - Senior Convertible Notes (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | May 31, 2020 | Nov. 30, 2018 | Jun. 12, 2017
Senior Convertible Notes |  |  |  |  |
Carrying amount of liability component | $ 1,667,200,000 | $ 1,059,700,000 |  |  |
Senior Notes |  |  |  |  |
Senior Convertible Notes |  |  |  |  |
Total principal amount | 2,057,500,000 | 1,250,000,000.0 |  |  |
Unamortized debt discount | (371,100,000) | (177,200,000) |  |  |
Unamortized debt issuance costs | (19,200,000) | (13,100,000) |  |  |
Carrying amount of liability component | 1,667,200,000 | 1,059,700,000 |  |  |
Carrying value of equity component | 461,000,000.0 | 242,200,000 |  |  |
Senior Notes | Convertible Notes due 2022 |  |  |  |  |
Senior Convertible Notes |  |  |  |  |
Total principal amount | 0 | $ 400,000,000.0 | $ 260,000,000.0 |  | $ 400,000,000.0
Remaining amortization period of debt discount on the liability component: |  | 2 years 6 months |  |  |
Senior Notes | Convertible Notes due 2023 |  |  |  |  |
Senior Convertible Notes |  |  |  |  |
Total principal amount | $ 850,000,000.0 | $ 850,000,000.0 |  | $ 850,000,000.0 |
Remaining amortization period of debt discount on the liability component: | 2 years 10 months 24 days | 4 years |  |  |
Senior Notes | Convertible Notes due 2025 |  |  |  |  |
Senior Convertible Notes |  |  |  |  |
Total principal amount | $ 1,207,500,000 | $ 0 | $ 1,210,000,000 |  |
Remaining amortization period of debt discount on the liability component: | 4 years 10 months 24 days |  |  |  |

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