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Intangible assets and goodwill - Schedule of Finite-lived Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Acquired Finite-Lived Intangible Assets [Line Items]    
Weighted Average Useful Life in Years 14 years 4 months 24 days  
Gross Carrying Amount $ 1,016.2 $ 832.1
Accumulated Amortization 287.4 227.5
Net Carrying Amount 728.8 604.6
Chimerix Asset Acquisition    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets acquired $ 156.9  
Products    
Acquired Finite-Lived Intangible Assets [Line Items]    
Weighted Average Useful Life in Years 14 years 4 months 24 days  
Gross Carrying Amount $ 982.1 798.0
Accumulated Amortization 253.3 193.5
Net Carrying Amount $ 728.8 604.5
Customer relationships    
Acquired 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    
Acquired 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 5.4
Net Carrying Amount $ 0.0 $ 0.1