v3.25.4
Property, plant and equipment - Additional Information (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2025
USD ($)
OperatingSegment
Dec. 31, 2024
USD ($)
OperatingSegment
Dec. 31, 2023
USD ($)
Disclosure of detailed information about property, plant and equipment [line items]      
Depreciation expense | $ $ 33.4 $ 34.0 $ 33.0
Number of operating segments of which impairment tests is to be performed for non-financial assets | OperatingSegment 3 3  
Cash flow extrapolated period using estimated some growth rate percentage five-year    
Estimated growth rate 2.00% 2.00%  
Pre-tax discount rate used 9.80% 10.20%  
China      
Disclosure of detailed information about property, plant and equipment [line items]      
Pre-tax discount rate used 8.40% 9.20%  
Percentage amount by which value assigned to pre-tax discount rate must increase in order for unit's recoverable amount to be equal to carrying amount 2.00%    
Percentage amount by which value assigned to long-term EBITDA margin must decrease in order for units recoverable amount to be equal to carrying amount. 2.10%    
North America      
Disclosure of detailed information about property, plant and equipment [line items]      
Pre-tax discount rate used 10.10% 10.60%