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Fair Value Measurements - Narrative (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2017	Jun. 08, 2015
Non-financial Assets | Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-financial assets	$ 0	$ 0
1.00% Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, interest rate	1.00%
1.625% Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, interest rate	1.625%
Convertible Debt | 1.00% Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, interest rate	1.00%	1.00%		1.00%
Convertible Debt | 1.625% Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, interest rate	1.625%	1.625%	1.625%
AXSEM
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration		$ 0

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ References

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Contractual interest rate for funds borrowed, under the debt agreement.

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