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Intangible assets - Schedule of Finite-lived Intangible Assets (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2022
Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]      
Cost $ 963.6 $ 963.6 $ 803.5
Accumulated Amortization 240.9 240.9 198.9
Net 722.7 722.7 604.6
Chimerix Asset Acquisition      
Finite-Lived Intangible Assets [Line Items]      
Finite-lived intangible assets acquired 154.7    
Products      
Finite-Lived Intangible Assets [Line Items]      
Cost 958.1 958.1 798.0
Accumulated Amortization 235.4 235.4 193.5
Net 722.7 $ 722.7 604.5
Products | Minimum      
Finite-Lived Intangible Assets [Line Items]      
Estimated Life   8 years  
Products | Maximum      
Finite-Lived Intangible Assets [Line Items]      
Estimated Life   22 years  
CDMO      
Finite-Lived Intangible Assets [Line Items]      
Estimated Life   8 years  
Cost 5.5 $ 5.5 5.5
Accumulated Amortization 5.5 5.5 5.4
Net $ 0.0 $ 0.0 $ 0.1