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Debt - Senior Convertible Notes (Details) - USD ($) | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020 | May 31, 2020 | Nov. 30, 2018
Senior Convertible Notes |  |  |  |
Carrying amount of liability component | $ 1,710,700,000 | $ 1,667,200,000 |  |
Senior Notes |  |  |  |
Senior Convertible Notes |  |  |  |
Principal amount | 2,057,500,000 | 2,057,500,000 |  |
Unamortized debt discount | (329,800,000) | (371,100,000) |  |
Unamortized debt issuance costs | (17,000,000.0) | (19,200,000) |  |
Carrying amount of liability component | 1,710,700,000 | 1,667,200,000 |  |
Carrying amount of equity component | 461,000,000.0 | 461,000,000.0 |  |
Senior Notes | Senior Convertible Notes due 2023 |  |  |  |
Senior Convertible Notes |  |  |  |
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 4 months 24 days | 2 years 10 months 24 days |  |
Senior Notes | Senior Convertible Notes due 2025 |  |  |  |
Senior Convertible Notes |  |  |  |
Principal amount | $ 1,207,500,000 | $ 1,207,500,000 | $ 1,210,000,000 |
Remaining amortization period of debt discount on the liability component: | 4 years 4 months 24 days | 4 years 10 months 24 days |  |

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