Plant and equipment (Details) - USD ($) | 3 Months Ended |
Mar. 31, 2023 | Mar. 31, 2022 |
Reconciliation of changes in property, plant and equipment [abstract] | | |
Property, plant and equipment at beginning of period | $ 210,400,000 | |
Property, plant and equipment at end of period | 295,600,000 | |
Employee salaries capitalized to assets under construction | 2,000,000 | $ 0 |
Share-based compensation cost capitalized to assets under construction | 200,000 | 0 |
Borrowing costs capitalised | $ 5,700,000 | $ 0 |
Capitalisation rate of borrowing costs eligible for capitalisation | 12.60% | |
Construction in progress | | |
Reconciliation of changes in property, plant and equipment [abstract] | | |
Property, plant and equipment at end of period | $ 253,100,000 | |
Machinery | | |
Reconciliation of changes in property, plant and equipment [abstract] | | |
Property, plant and equipment at end of period | 32,100,000 | |
Computer equipment | | |
Reconciliation of changes in property, plant and equipment [abstract] | | |
Property, plant and equipment at end of period | 1,900,000 | |
Vehicles | | |
Reconciliation of changes in property, plant and equipment [abstract] | | |
Property, plant and equipment at end of period | 200,000 | |
Leasehold improvements | | |
Reconciliation of changes in property, plant and equipment [abstract] | | |
Property, plant and equipment at end of period | 8,300,000 | |
Gross carrying amount | | |
Reconciliation of changes in property, plant and equipment [abstract] | | |
Property, plant and equipment at beginning of period | 217,600,000 | |
Additions other than through business combinations, property, plant and equipment | 87,100,000 | |
Increase (decrease) through transfers from construction in progress, property, plant and equipment | 0 | |
Property, plant and equipment at end of period | 304,700,000 | |
Gross carrying amount | Construction in progress | | |
Reconciliation of changes in property, plant and equipment [abstract] | | |
Property, plant and equipment at beginning of period | 167,100,000 | |
Additions other than through business combinations, property, plant and equipment | 86,600,000 | |
Increase (decrease) through transfers from construction in progress, property, plant and equipment | (600,000) | |
Property, plant and equipment at end of period | 253,100,000 | |
Gross carrying amount | Machinery | | |
Reconciliation of changes in property, plant and equipment [abstract] | | |
Property, plant and equipment at beginning of period | 38,200,000 | |
Additions other than through business combinations, property, plant and equipment | 0 | |
Increase (decrease) through transfers from construction in progress, property, plant and equipment | 600,000 | |
Property, plant and equipment at end of period | 38,800,000 | |
Gross carrying amount | Computer equipment | | |
Reconciliation of changes in property, plant and equipment [abstract] | | |
Property, plant and equipment at beginning of period | 2,100,000 | |
Additions other than through business combinations, property, plant and equipment | 300,000 | |
Increase (decrease) through transfers from construction in progress, property, plant and equipment | 0 | |
Property, plant and equipment at end of period | 2,400,000 | |
Gross carrying amount | Vehicles | | |
Reconciliation of changes in property, plant and equipment [abstract] | | |
Property, plant and equipment at beginning of period | 300,000 | |
Additions other than through business combinations, property, plant and equipment | 0 | |
Property, plant and equipment at end of period | 300,000 | |
Gross carrying amount | Leasehold improvements | | |
Reconciliation of changes in property, plant and equipment [abstract] | | |
Property, plant and equipment at beginning of period | 9,900,000 | |
Additions other than through business combinations, property, plant and equipment | 200,000 | |
Property, plant and equipment at end of period | 10,100,000 | |
Accumulated depreciation | | |
Reconciliation of changes in property, plant and equipment [abstract] | | |
Property, plant and equipment at beginning of period | (7,200,000) | |
Depreciation | (1,900,000) | |
Property, plant and equipment at end of period | (9,100,000) | |
Accumulated depreciation | Construction in progress | | |
Reconciliation of changes in property, plant and equipment [abstract] | | |
Property, plant and equipment at beginning of period | 0 | |
Depreciation | 0 | |
Property, plant and equipment at end of period | 0 | |
Accumulated depreciation | Machinery | | |
Reconciliation of changes in property, plant and equipment [abstract] | | |
Property, plant and equipment at beginning of period | (5,300,000) | |
Depreciation | (1,400,000) | |
Property, plant and equipment at end of period | (6,700,000) | |
Accumulated depreciation | Computer equipment | | |
Reconciliation of changes in property, plant and equipment [abstract] | | |
Property, plant and equipment at beginning of period | (300,000) | |
Depreciation | (200,000) | |
Property, plant and equipment at end of period | (500,000) | |
Accumulated depreciation | Vehicles | | |
Reconciliation of changes in property, plant and equipment [abstract] | | |
Property, plant and equipment at beginning of period | (100,000) | |
Depreciation | 0 | |
Property, plant and equipment at end of period | (100,000) | |
Accumulated depreciation | Leasehold improvements | | |
Reconciliation of changes in property, plant and equipment [abstract] | | |
Property, plant and equipment at beginning of period | (1,500,000) | |
Depreciation | (300,000) | |
Property, plant and equipment at end of period | $ (1,800,000) | |