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Acquisitions - PaxVax Narrative (Details) $ in Millions		6 Months Ended
Acquisitions - PaxVax Narrative (Details) $ in Millions	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%