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Long-Term Debt - 3.875% Notes (Details) - USD ($) | Dec. 31, 2020 | Aug. 21, 2020 | Dec. 31, 2019 | Mar. 31, 2017
--- | --- | --- | --- | ---
3.875% Notes | Notes Payable |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, interest rate | 3.875% | 3.875% |  |
Principal amount of debt |  | $ 700,000,000.0 |  |
Debt discount and issuance costs |  | $ 9,400,000 |  |
1.625% Notes | Convertible Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, interest rate | 1.625% |  | 1.625% | 1.625%
Principal amount of debt |  |  |  | $ 575,000,000.0

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