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Subsequent events (Details)
$ in Millions
Aug. 08, 2023
USD ($)
employee
Jul. 31, 2023
USD ($)
productCandidate
Jun. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Subsequent Event [Line Items]        
Contract with customer, liability     $ 19.3 $ 31.7
Current portion of contract liabilities     $ 14.3 $ 26.4
Subsequent Event | August 2023 Restructuring Plan        
Subsequent Event [Line Items]        
Expected workforce reduction | employee 400      
Subsequent Event | August 2023 Restructuring Plan | Minimum        
Subsequent Event [Line Items]        
Expected restructuring charges $ 19.0      
Subsequent Event | August 2023 Restructuring Plan | Maximum        
Subsequent Event [Line Items]        
Expected restructuring charges $ 21.0      
Ebanga | Subsequent Event | Ridgeback | BARDA Contract, Payable in Third Quarter of 2023        
Subsequent Event [Line Items]        
Current portion of contract liabilities   $ 6.3    
Ebanga | Subsequent Event | Ridgeback | BARDA Contract, Contract not Ceased Prior to June 1, 2026        
Subsequent Event [Line Items]        
Maximum contingent consideration   $ 50.4    
BARDA | Ebanga | Subsequent Event        
Subsequent Event [Line Items]        
Term of contract   10 years    
Contract with customer, liability   $ 704.0    
BARDA | Ebanga | Two Year Option | Subsequent Event        
Subsequent Event [Line Items]        
Number of option periods | productCandidate   2    
Contract with customer, liability   $ 121.0    
BARDA | Ebanga | Five Year Option | Subsequent Event        
Subsequent Event [Line Items]        
Term of contract   5 years    
Number of option periods | productCandidate   5    
Contract with customer, liability   $ 583.0