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Subsequent events (Details)
$ in Millions
Oct. 19, 2023
USD ($)
Oct. 18, 2023
USD ($)
Option
Sep. 30, 2023
Royalty Purchase Agreement | Royalty Pharma      
Subsequent Event [Line Items]      
Previously assigned royalty payment, percentage     42.933%
Subsequent Event | Senior Secured Term Loan      
Subsequent Event [Line Items]      
Outstanding principal and accrued interest repaid $ 302.1    
Prepayment premiums, expenses and other exit fees $ 82.1    
Subsequent Event | A&R Royalty Purchase Agreement      
Subsequent Event [Line Items]      
Cash consideration   $ 1,000.0  
Retained Royalty Rights percentage sold   38.0447%  
Additional cash consideration   $ 500.0  
Number of put options held by the company | Option   5  
Maximum number of put options which can be exercised before Royalty Pharma can exercise a call option | Option   2  
Maximum percentage of remaining retained royalty rights that are available upon exercise of call option   50.00%  
Royalty purchase agreement termination period once there are no further royalty payment obligations   60 days  
Subsequent Event | A&R Royalty Purchase Agreement | Royalty Pharma      
Subsequent Event [Line Items]      
Total percentage of royalty rights assigned   80.9777%  
Royalty purchase agreement, payment maximum   $ 1,300.0  
Percentage of total royalty payable after threshold royalties received   66.6667%  
Percentage of maximum royalty payable until assigned royalty rights   90.4888%  
Percentage of maximum royalty payable thereafter assigned royalty rights   83.3333%