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Acquisitions - PaxVax Narrative (Details) $ in Millions |  | 6 Months Ended |
--- | --- | --- | ---
Oct. 04, 2018 USD ($) employee | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |  |
Weighted average amortization period |  | 14 years |
Goodwill |  | $ 268.3 | $ 259.7
PaxVax |  |  |
Business Acquisition [Line Items] |  |  |
Number of employees | employee | 250 |  |
Total purchase price | $ 273.1 |  |
Acquired intangible asset | $ 133.0 |  |
Weighted average amortization period | 19 years |  |
Goodwill | $ 71.0 |  |
Vivotif | PaxVax |  |  |
Business Acquisition [Line Items] |  |  |
Present value, discount rate | 14.50% |  |
Vaxchora | PaxVax |  |  |
Business Acquisition [Line Items] |  |  |
Present value, discount rate | 15.00% |  |

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