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Summary of significant accounting policies - Liquidity and capital resources (Details) - USD ($)
12 Months Ended
Aug. 20, 2024
Jul. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Sep. 30, 2024
Aug. 30, 2024
Debt Instrument [Line Items]              
Long-term debt     $ 700,000,000.0 $ 868,400,000      
Proceeds from sale of business     110,200,000 270,200,000 $ 0    
Cash and cash equivalents     99,500,000 $ 111,700,000 $ 642,600,000    
Jansen Pharmaceuticals, Inc.              
Debt Instrument [Line Items]              
Proceeds from legal settlements   $ 50,000,000 50,000,000        
Disposal Group, Disposed of by Sale, Not Discontinued Operations | RSDL              
Debt Instrument [Line Items]              
Proceeds from sale of business   $ 75,000,000 75,000,000        
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Baltimore-Camden Facility              
Debt Instrument [Line Items]              
Proceeds from sale of business $ 35,000,000   35,000,000        
Secured Debt | Term Loan | Line of Credit              
Debt Instrument [Line Items]              
Debt instrument, face amount           $ 250,000,000 $ 250,000,000
Long-term debt     250,000,000        
Revolving Credit Facility | Revolving Loans | Line of Credit              
Debt Instrument [Line Items]              
Long-term debt     0        
Maximum borrowing capacity     100,000,000     100,000,000  
Maximum borrowing capacity, increase limit     125,000,000     125,000,000  
Maximum borrowing capacity, decrease limit     50,000,000     $ 50,000,000  
Current borrowing capacity     $ 100,000,000