Deferred revenue - Movement In Deferred Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Movement in Deferred Revenue [Roll Forward]
Current deferred revenue	$ 3.3	$ 0.2
Non-current deferred revenue	5.0	5.3
Product revenue
Movement in Deferred Revenue [Roll Forward]
Balance, beginning of the period	0.0	0.0
Additions	12.3	0.0
Revenue recognized	(11.7)	0.0
Balance, end of the period	0.6	0.0
Current deferred revenue	0.6	0.0
Non-current deferred revenue	0.0	0.0
Service
Movement in Deferred Revenue [Roll Forward]
Balance, beginning of the period	5.5	0.0
Additions	2.7	5.4
Revenue recognized	0.0	0.0
Foreign exchange loss	(0.5)	0.1
Balance, end of the period	7.7	5.5
Current deferred revenue	2.7	0.2
Non-current deferred revenue	$ 5.0	$ 5.3