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Subsequent Events (Details)
$ in Thousands
1 Months Ended 2 Months Ended 12 Months Ended
Nov. 09, 2021
USD ($)
shares
Feb. 09, 2021
USD ($)
shares
Apr. 30, 2024
USD ($)
Mar. 31, 2024
USD ($)
shares
Sep. 30, 2022
USD ($)
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Feb. 29, 2024
shares
Jan. 31, 2024
entity
Aug. 08, 2022
shares
May 09, 2022
USD ($)
pence
Disclosure of non-adjusting events after reporting period [line items]                        
Sale of investments held at fair value           $ 33,309 $ 118,710 $ 218,125        
Karuna                        
Disclosure of non-adjusting events after reporting period [line items]                        
Sale of investments held at fair value $ 100,125 $ 118,000     $ 115,457 $ 33,309            
Common                        
Disclosure of non-adjusting events after reporting period [line items]                        
Value of shares authorized to be repurchased                       $ 50,000
Stock repurchase program, purchase price per share | pence                       1
Aggregated number of shares repurchased under share repurchase program (in shares) | shares           18,278,873            
Common | Karuna                        
Disclosure of non-adjusting events after reporting period [line items]                        
Sale of equity instruments in other entities (in shares) | shares 750,000 1,000,000       167,579         125,000  
Establishment of new entities                        
Disclosure of non-adjusting events after reporting period [line items]                        
Number of entities established | entity                   2    
Major ordinary share transactions                        
Disclosure of non-adjusting events after reporting period [line items]                        
Proposed capital return amount       $ 100,000                
Major ordinary share transactions | Common                        
Disclosure of non-adjusting events after reporting period [line items]                        
Aggregated number of shares repurchased under share repurchase program (in shares) | shares                 20,182,863      
Sale of investment held at fair value | Karuna                        
Disclosure of non-adjusting events after reporting period [line items]                        
Sale of investments held at fair value       $ 292,672                
Sale of investment held at fair value | Common | Karuna                        
Disclosure of non-adjusting events after reporting period [line items]                        
Sale of equity instruments in other entities (in shares) | shares       886,885,000                
Major Financing Activity | Seaport Therapeutics                        
Disclosure of non-adjusting events after reporting period [line items]                        
Series A financing, amount     $ 100,000                  
Major Equity Investment | Seaport Therapeutics                        
Disclosure of non-adjusting events after reporting period [line items]                        
Purchase of equity investment     $ 32,000                  
Ownership interest     61.50%