Property, plant and equipment, net - Schedule of Property and Equipment (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 718.3	$ 684.9
Less – accumulated depreciation	(25.1)	(16.1)
Total property, plant and equipment, net	693.2	668.8
Building
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	58.8	58.8
Plant equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	51.2	55.3
Computer software and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4.9	4.5
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	0.2	0.2
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	14.7	13.5
Assets under construction
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 588.5	$ 552.6