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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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