Income taxes - Schedule of Net Loss From Operations Before Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Canada	$ (49.3)	$ (72.0)
Foreign	(88.4)	(65.9)
Net loss before taxes	$ (137.7)	$ (137.9)