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Convertible Senior Notes - Net Carrying Amount (Details) - Senior Notes - USD ($)	Sep. 30, 2020	Aug. 31, 2020	Dec. 31, 2019	Apr. 30, 2019	Mar. 31, 2019	Apr. 30, 2018
0% Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Principal	$ 1,000,000,000	$ 1,000,000,000.0
Unamortized debt discount	(236,809,000)
Unamortized issuance costs	(11,842,000)	(15,900,000)
Debt discount for conversion option	241,300,000
Issuance costs	(3,838,000)
Net carrying amount (equity)	237,462,000	241,300,000
0.125% Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Principal	800,000,000		$ 800,000,000	$ 100,000,000	$ 700,000,000
Unamortized debt discount	(158,077,000)		(184,698,000)
Unamortized issuance costs	(10,862,000)		(12,691,000)	(19,800,000)
Debt discount for conversion option	212,000,000		212,000,000
Issuance costs	(5,253,000)		(5,253,000)
Net carrying amount (equity)	206,747,000		206,747,000	212,000,000.0
0.25% Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Principal	173,018,000		345,000,000			$ 345,000,000
Unamortized debt discount	(16,484,000)		(42,280,000)
Unamortized issuance costs	(1,960,000)		(5,028,000)			(9,400,000)
Net carrying amount (liability)		156,100,000
Debt discount for conversion option	32,193,000		64,193,000
Issuance costs	(877,000)		(1,749,000)
Net carrying amount (equity)	31,316,000	345,600,000	62,444,000			64,200,000
Carrying Amount | 0% Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Net carrying amount (liability)		$ 758,700,000
Carrying Amount | 0.125% Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Net carrying amount (liability)				$ 588,000,000.0
Carrying Amount | 0.25% Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Net carrying amount (liability)						$ 280,800,000
Carrying Amount | Fair Value, Measurements, Nonrecurring
Debt Instrument [Line Items]
Net carrying amount (liability)	1,536,984,000		900,303,000
Carrying Amount | Fair Value, Measurements, Nonrecurring | 0% Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Net carrying amount (liability)	751,349,000		0
Carrying Amount | Fair Value, Measurements, Nonrecurring | 0.125% Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Net carrying amount (liability)	631,061,000		602,611,000
Carrying Amount | Fair Value, Measurements, Nonrecurring | 0.25% Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Net carrying amount (liability)	$ 154,574,000		$ 297,692,000

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