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Long-Term Debt - 1.625% Notes due 2023 (Details) | Dec. 31, 2020 USD ($) $ / shares | Dec. 01, 2020 trading_day | Mar. 31, 2017 USD ($) trading_day d $ / shares Rate | Dec. 31, 2019 USD ($)
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Current portion of long-term debt | $ | $ 531,600,000 |  |  | $ 736,000,000.0
1.625% Notes | Convertible Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, interest rate (as a percent) | 1.625% |  | 1.625% | 1.625%
Principal amount of debt | $ |  |  | $ 575,000,000.0 |
Conversion rate | Rate |  |  | 4.82567% |
Conversion price per share (in dollars per share) | $ / shares | $ 20.72 |  | $ 20.72 |
Threshold trading days |  | 20 |  |
Threshold consecutive trading days |  | 30 |  |
Threshold percentage of stock price trigger (greater than or equal to) | 130.00% |  |  |
Stock price trigger (in dollars per share) | $ / shares | $ 26.94 |  |  |
Current portion of long-term debt | $ | $ 515,600,000 |  |  |
Debt Conversion One | 1.625% Notes | 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 | 1.625% Notes | Convertible Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Threshold consecutive trading days | d |  |  | 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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