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Plant and equipment (Tables)
3 Months Ended
Mar. 31, 2023
Disclosure of detailed information about property, plant and equipment [abstract]  
Summary of plant and equipment
For the three months ended March 31,2023
Assets under constructionPlant equipment and otherComputer equipmentVehiclesLeasehold improvementsTotal
Cost
Balance, beginning of the period$167.1 $38.2 $2.1 $0.3 $9.9 $217.6 
Additions86.6 — 0.3 — 0.2 87.1 
Transfers(0.6)0.6 — — — — 
Balance, end of the period253.1 38.8 2.4 0.3 10.1 304.7 
Accumulated depreciation
Balance, beginning of the period— (5.3)(0.3)(0.1)(1.5)(7.2)
Depreciation— (1.4)(0.2)— (0.3)(1.9)
Balance, end of the period (6.7)(0.5)(0.1)(1.8)(9.1)
Net book value$253.1 $32.1 $1.9 $0.2 $8.3 $295.6