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Share-based compensation and stockholders' equity - Schedule of Stock-based Compensation Expense (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Total share-based compensation expense $ 5.9 $ 6.8
R&D    
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Total share-based compensation expense 0.5 0.7
Selling, general and administrative    
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Total share-based compensation expense 4.6 4.4
Total Product sales, net | Cost of Commercial Product sales    
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Total share-based compensation expense 0.0 0.1
MCM Product sales | Cost of Commercial Product sales    
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Total share-based compensation expense 0.7 1.3
Total Bioservices revenues | Cost of Commercial Product sales    
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Total share-based compensation expense $ 0.1 $ 0.3