v3.25.4
Income tax - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]      
Deferred income tax asset $ 0    
Accumulated loss carry-forwards 1,292,900,000 $ 1,052,900,000  
Unused tax losses for which no deferred tax asset recognized 1,252,800,000 1,013,900,000 $ 940,100,000
Hypothetical deferred tax impact of unused tax losses for which no deferred tax asset recognised 258,100,000 208,900,000 193,700,000
Other Foreign Jurisdictions Tax Losses      
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]      
Unused tax losses for which no deferred tax asset recognized 1,100,000 $ 5,200,000 $ 2,700,000
Subsidiaries      
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]      
Deferred income tax asset $ 0    
Sweden      
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]      
Income tax rate 206.00% 206.00% 206.00%