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Intangible assets and goodwill - Schedule of Finite-Lived Intangible Assets (Details) - USD ($)
$ in Millions
 3 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 889.5 $ 1,016.2
Accumulated Amortization 306.7 287.4
Net Carrying Amount 582.8 728.8
Chimerix    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets acquired $ 6.3  
BARDA | Ebanga    
Finite-Lived Intangible Assets [Line Items]    
Term of contract 10 years  
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Travel Health Business    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets disposed of in sale $ 102.9  
Products    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Useful Life in Years 13 years 6 months  
Gross Carrying Amount $ 855.4 982.1
Accumulated Amortization 272.6 253.3
Net Carrying Amount $ 582.8 728.8
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Useful Life in Years 0 years  
Gross Carrying Amount $ 28.6 28.6
Accumulated Amortization 28.6 28.6
Net Carrying Amount $ 0.0 0.0
CDMO    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Useful Life in Years 0 years  
Gross Carrying Amount $ 5.5 5.5
Accumulated Amortization 5.5 5.5
Net Carrying Amount $ 0.0 $ 0.0