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Debt - Senior Convertible Notes (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | May 31, 2020 | Nov. 30, 2018
Senior Convertible Notes |  |  |  |
Carrying amount of liability component | $ 1,702,700,000 | $ 1,667,200,000 |  |
Senior Notes |  |  |  |
Senior Convertible Notes |  |  |  |
Total principal amount | 1,999,800,000 | 2,057,500,000 |  |
Unamortized debt discount | (282,700,000) | (371,100,000) |  |
Unamortized debt issuance costs | (14,400,000) | (19,200,000) |  |
Carrying amount of liability component | 1,702,700,000 | 1,667,200,000 |  |
Carrying value of equity component | 449,400,000 | 461,000,000.0 |  |
Senior Notes | Convertible Notes due 2023 |  |  |  |
Senior Convertible Notes |  |  |  |
Total principal amount | $ 792,300,000 | $ 850,000,000.0 |  | $ 850,000,000
Remaining amortization period of debt discount on the liability component: | 1 year 10 months 24 days | 2 years 10 months 24 days |  |
Senior Notes | Convertible Notes due 2025 |  |  |  |
Senior Convertible Notes |  |  |  |
Total principal amount | $ 1,207,500,000 | $ 1,207,500,000 | $ 1,210,000,000 |
Remaining amortization period of debt discount on the liability component: | 3 years 10 months 24 days | 4 years 10 months 24 days |  |

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