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Convertible Senior Notes - Net Carrying Amount (Details) - Senior Notes - USD ($)	Jun. 30, 2021	Dec. 31, 2020	Aug. 31, 2020	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	$ 1,000,000,000.0
Unamortized debt discount	0	(226,732,000)
Unamortized issuance costs	(13,637,000)	(11,338,000)
0.125% Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Principal	699,992,000	800,000,000		$ 100,000,000	$ 700,000,000
Unamortized debt discount	0	(149,138,000)
Unamortized issuance costs	(11,015,000)	(10,248,000)
0.25% Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Principal		115,576,000				$ 345,000,000
Unamortized debt discount		(9,953,000)
Unamortized issuance costs		(1,245,000)
Carrying Amount | Fair Value, Measurements, Nonrecurring
Debt Instrument [Line Items]
Net carrying amount	1,675,340,000	1,506,922,000
Carrying Amount | Fair Value, Measurements, Nonrecurring | 0% Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Net carrying amount	986,363,000	761,930,000
Carrying Amount | Fair Value, Measurements, Nonrecurring | 0.125% Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Net carrying amount	688,977,000	640,614,000
Carrying Amount | Fair Value, Measurements, Nonrecurring | 0.25% Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Net carrying amount	$ 0	$ 104,378,000

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