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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