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Share-based compensation	9 Months Ended
Share-based compensation	Sep. 30, 2019
Stockholders' Equity Note [Abstract]
Share-based compensation	Share-based compensation During the nine months ended September 30, 2019, the Company granted stock options to purchase 0.3 million shares of common stock and 0.5 million restricted stock units under the Emergent BioSolutions Inc. Stock Incentive Plan. The grants vest over three equal annual installments beginning on the day prior to the anniversary of the grant date.