v3.26.1
Accounting policies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Useful lives    
Cash and cash equivalents in subsidiaries subject to credit agreement restrictions $ 37,129 $ 97,370
Minimum | Leased Land And Buildings [Member]    
Useful lives    
Years of estimated useful life - Leases. 5 years  
Minimum | Leased Plant And Machinery [Member]    
Useful lives    
Years of estimated useful life - Leases. 1 year  
Maximum | Leased Land And Buildings [Member]    
Useful lives    
Years of estimated useful life - Leases. 50 years  
Maximum | Leased Plant And Machinery [Member]    
Useful lives    
Years of estimated useful life - Leases. 37 years  
Capitalised development expenditure | Minimum    
Disclosure of intangible assets material to entity [abstract]    
Amortization period 4 years  
Capitalised development expenditure | Maximum    
Disclosure of intangible assets material to entity [abstract]    
Amortization period 10 years  
Rights of use | Minimum    
Disclosure of intangible assets material to entity [abstract]    
Amortization period 10 years  
Rights of use | Maximum    
Disclosure of intangible assets material to entity [abstract]    
Amortization period 20 years  
Computer software | Minimum    
Disclosure of intangible assets material to entity [abstract]    
Amortization period 2 years  
Computer software | Maximum    
Disclosure of intangible assets material to entity [abstract]    
Amortization period 5 years  
Buildings | Minimum    
Useful lives    
Years of Estimated Useful Life 25 years  
Buildings | Maximum    
Useful lives    
Years of Estimated Useful Life 50 years  
Plant and machinery | Minimum    
Useful lives    
Years of Estimated Useful Life 8 years  
Plant and machinery | Maximum    
Useful lives    
Years of Estimated Useful Life 20 years  
Tools | Minimum    
Useful lives    
Years of Estimated Useful Life 12 years 6 months  
Tools | Maximum    
Useful lives    
Years of Estimated Useful Life 15 years  
Furniture and fixtures | Minimum    
Useful lives    
Years of Estimated Useful Life 10 years  
Furniture and fixtures | Maximum    
Useful lives    
Years of Estimated Useful Life 15 years  
Computer hardware | Minimum    
Useful lives    
Years of Estimated Useful Life 4 years  
Computer hardware | Maximum    
Useful lives    
Years of Estimated Useful Life 8 years  
Transport equipment | Minimum    
Useful lives    
Years of Estimated Useful Life 10 years  
Transport equipment | Maximum    
Useful lives    
Years of Estimated Useful Life 15 years