Consolidated balance sheets - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Oct. 31, 2022	Oct. 31, 2021
Current assets
Cash and cash equivalents	$ 70.6	$ 517.9	$ 578.3	$ 596.9
Restricted cash	9.7	0.0	0.0	0.0
Accounts receivable (net of allowance for credit losses of $0)	1.0	4.3	1.5	4.1
Other receivables	1.9	9.8	7.7	0.9
Prepayments, deposits and other current assets	56.2	95.2	85.8	8.6
Inventories, net	9.6	7.7	7.5	1.2
Total current assets	149.0	634.9	680.8	611.7
Non-current assets
Property, plant and equipment, net	668.8	210.0	150.2	26.4
Operating lease right-of-use assets	56.4	43.2	42.6	18.6
Finance lease right-of-use assets	2.2	0.0	0.0	0.0
Other assets	9.6	4.6	3.9	0.0
Total non-current assets	737.0	257.8	196.7	45.0
Total assets	886.0	892.7	877.5	656.7
Current liabilities
Accounts payable	76.4	20.1	12.6	9.4
Accrued liabilities	75.7	51.8	33.8	9.4
Deferred revenue	0.2	0.0	0.0	0.0
Operating lease liabilities	4.4	4.3	3.9	1.8
Total current liabilities	156.7	76.2	50.3	20.6
Non-current liabilities
Operating lease liabilities	56.2	41.7	40.5	18.7
Finance Lease, Liability, Noncurrent	2.3	0.0	0.0	0.0
Deferred revenue	5.3	0.0	0.0	0.0
Convertible debt	288.1	272.8	288.5	100.9
Warrants	0.0	0.0	0.0	82.1
Asset retirement obligations	1.0	0.4	0.4	0.4
Total noncurrent liabilities	352.9	314.9	329.4	202.1
Total liabilities	509.6	391.1	379.7	222.7
Commitments and Contingencies (Note 23)
Equity
Common stock and additional paid-in capital Authorized unlimited shares, Issued and outstanding - 178.2 million shares (176.1 million, 176.0 million, 163.3 million shares at December 31, 2022, October 31, 2022 and 2021, respectively)	648.3	635.3	633.1	519.3
Accumulated deficit	(271.6)	(133.6)	(135.2)	(85.0)
Accumulated other comprehensive loss	(0.3)	(0.3)	(0.3)	(0.3)
Non-controlling interest	0.0	0.2	0.2	0.0
Total equity	376.4	501.6	497.8	434.0
Total liabilities and equity	$ 886.0	$ 892.7	$ 877.5	$ 656.7