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Significant Accounting Policies - Convertible Senior Notes (Details) - Senior Notes - USD ($) | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Apr. 30, 2019 | Apr. 30, 2018 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
0.125 Percent Convertible Senior Notes Due 2025 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount |  |  | $ 800,000,000 | $ 700,000,000 |
Interest rate, stated percentage |  |  |  | 0.125% |
Option to purchase additional notes | $ 100,000,000 |  |  |  |
Principal amount | $ 800,000,000 |  |  |  |
0.25% Convertible Senior Notes Due 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount |  | $ 345,000,000 | $ 345,000,000 |  | $ 345,000,000
Interest rate, stated percentage |  | 0.25% |  |  |
Option to purchase additional notes |  | $ 45,000,000 |  |  |
Principal amount |  | $ 345,000,000 |  |  |

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