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Significant Accounting Policies - Convertible Senior Notes (Details) - Senior Notes - USD ($)	1 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
0.125 Percent Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Face amount			$ 800,000,000	$ 700,000,000
Interest rate, stated percentage				0.125%
Option to purchase additional notes	$ 100,000,000
Principal amount	$ 800,000,000
0.25% Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Face amount		$ 345,000,000	$ 345,000,000		$ 345,000,000
Interest rate, stated percentage		0.25%
Option to purchase additional notes		$ 45,000,000
Principal amount		$ 345,000,000

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