v3.25.4
Non-financial assets and liabilities - Summary of Intangible Assets (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Dec. 31, 2025
Jun. 30, 2025
Intangible Assets And Goodwill [Roll Forward]    
Opening net book amount $ 571,826 $ 575,736
Additions 65 50
Reclassification   0
Exchange differences 8 (1)
Amortization charge (3,099) (3,959)
Closing net book amount 568,800 571,826
Cost    
Intangible Assets And Goodwill [Roll Forward]    
Opening net book amount 651,226  
Closing net book amount 651,299 651,226
Accumulated amortization    
Intangible Assets And Goodwill [Roll Forward]    
Opening net book amount (17,481)  
Closing net book amount (20,580) (17,481)
Accumulated impairment    
Intangible Assets And Goodwill [Roll Forward]    
Opening net book amount (61,919)  
Closing net book amount (61,919) (61,919)
Goodwill    
Intangible Assets And Goodwill [Roll Forward]    
Opening net book amount 134,453 134,453
Reclassification   0
Exchange differences 0 0
Closing net book amount 134,453 134,453
Goodwill | Cost    
Intangible Assets And Goodwill [Roll Forward]    
Opening net book amount 134,453  
Closing net book amount 134,453 134,453
Goodwill | Accumulated amortization    
Intangible Assets And Goodwill [Roll Forward]    
Opening net book amount 0  
Closing net book amount 0 0
Goodwill | Accumulated impairment    
Intangible Assets And Goodwill [Roll Forward]    
Opening net book amount 0  
Closing net book amount 0 0
Acquired licenses to patents    
Intangible Assets And Goodwill [Roll Forward]    
Opening net book amount 1,655 1,626
Additions 65 50
Reclassification   0
Exchange differences 8 (1)
Amortization charge (17) (20)
Closing net book amount 1,711 1,655
Acquired licenses to patents | Cost    
Intangible Assets And Goodwill [Roll Forward]    
Opening net book amount 3,077  
Closing net book amount 3,150 3,077
Acquired licenses to patents | Accumulated amortization    
Intangible Assets And Goodwill [Roll Forward]    
Opening net book amount (1,422)  
Closing net book amount (1,439) (1,422)
Acquired licenses to patents | Accumulated impairment    
Intangible Assets And Goodwill [Roll Forward]    
Opening net book amount 0  
Closing net book amount 0 0
In-process research and development acquired    
Intangible Assets And Goodwill [Roll Forward]    
Opening net book amount 325,081 427,779
Additions 0 0
Reclassification   (102,698)
Exchange differences 0 0
Amortization charge 0 0
Closing net book amount 325,081 $ 325,081
Useful life   22 years
In-process research and development acquired | Cost    
Intangible Assets And Goodwill [Roll Forward]    
Opening net book amount 387,000  
Closing net book amount 387,000 $ 387,000
In-process research and development acquired | Accumulated amortization    
Intangible Assets And Goodwill [Roll Forward]    
Opening net book amount 0  
Closing net book amount 0 0
In-process research and development acquired | Accumulated impairment    
Intangible Assets And Goodwill [Roll Forward]    
Opening net book amount (61,919)  
Closing net book amount (61,919) (61,919)
Current marketed products    
Intangible Assets And Goodwill [Roll Forward]    
Opening net book amount 110,637 11,878
Additions 0 0
Reclassification   102,698
Exchange differences 0 0
Amortization charge (3,082) (3,939)
Closing net book amount 107,555 110,637
Current marketed products | Cost    
Intangible Assets And Goodwill [Roll Forward]    
Opening net book amount 126,696  
Closing net book amount 126,696 126,696
Current marketed products | Accumulated amortization    
Intangible Assets And Goodwill [Roll Forward]    
Opening net book amount (16,059)  
Closing net book amount (19,141) (16,059)
Current marketed products | Accumulated impairment    
Intangible Assets And Goodwill [Roll Forward]    
Opening net book amount 0  
Closing net book amount $ 0 $ 0