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Convertible Senior Notes - Net Carrying Amount (Details) - Senior Notes - USD ($)	Mar. 31, 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	(14,294,000)	(11,338,000)
0.125% Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Principal	699,995,000	800,000,000		$ 100,000,000	$ 700,000,000
Unamortized debt discount	0	(149,138,000)
Unamortized issuance costs	(11,755,000)	(10,248,000)
0.25% Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Principal	110,896,000	115,576,000				$ 345,000,000
Unamortized debt discount	0	(9,953,000)
Unamortized issuance costs	(1,402,000)	(1,245,000)
Carrying Amount | Fair Value, Measurements, Nonrecurring
Debt Instrument [Line Items]
Net carrying amount	1,783,440,000	1,506,922,000
Carrying Amount | Fair Value, Measurements, Nonrecurring | 0% Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Net carrying amount	985,706,000	761,930,000
Carrying Amount | Fair Value, Measurements, Nonrecurring | 0.125% Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Net carrying amount	688,240,000	640,614,000
Carrying Amount | Fair Value, Measurements, Nonrecurring | 0.25% Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Net carrying amount	$ 109,494,000	$ 104,378,000

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Face (par) amount of debt instrument at time of issuance.

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