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Income taxes - Operating loss carryforwards (Details) - USD ($)
$ in Millions
1 Months Ended
Jun. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Income taxes        
Deferred tax liability from restructuring $ 79.5      
UNITED STATES        
Income taxes        
Net operating loss carry forwards   $ 332.0 $ 0.0 $ 0.0
State and Local Jurisdiction [Member]        
Income taxes        
Net operating loss carry forwards   $ 119.5 $ 0.0 $ 0.0