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Contingent Consideration (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	$ 60.0
Milestone achievement - asset acquisition	10.0
Measurement period adjustment	1.5
Change in fair value	5.5
Settlements	(12.0)
Balance, end of period	65.0
Raxibacumab
Business Acquisition [Line Items]
Contingent consideration liability increase	$ 10.0

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- Definition

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Change In Fair Value

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

+ References

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-Name Accounting Standards Codification
-Topic 230
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-Section 45
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount of purchases of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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