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v3.19.3.a.u2

Long-Term Debt - 1.00% Notes due 2020 (Details) - 1.00% Notes | Jun. 08, 2015 USD ($) d $ / shares Rate | Dec. 31, 2019 $ / shares | Dec. 31, 2018
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Debt instrument, interest rate |  | 1.00% |
Convertible Debt |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount of debt | $ | $ 690,000,000.0 |  |
Debt instrument, interest rate | 1.00% | 1.00% | 1.00%
Conversion rate | Rate | 5.40643% |  |
Conversion price per share (in dollars per share) | $ / shares | $ 18.50 | $ 18.50 |
Debt Conversion One | Convertible Debt |  |  |
Debt Instrument [Line Items] |  |  |
Threshold trading days | 20 |  |
Threshold consecutive trading days | 30 |  |
Threshold percentage of stock price trigger (greater than or equal to) | 130.00% |  |
Debt Conversion Two | Convertible Debt |  |  |
Debt Instrument [Line Items] |  |  |
Threshold consecutive trading days | 5 |  |
Period immediately following consecutive trading days (in business days) | 5 days |  |
Ratio of trading price per 1000 principal amount (as a percent) (less than) | 0.98 |  |

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