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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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