Restructuring and Related Cost, Number of Positions Expected To Be Eliminated, Percent

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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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The net result for the period of deducting operating expenses from operating revenues.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of cash restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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- Definition

Cash received on stock transaction after deduction of issuance costs.

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No definition available.

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Basis of Presentation - Narrative (Details) - USD ($) $ in Millions				3 Months Ended		6 Months Ended
	Mar. 26, 2024	Mar. 25, 2024	Aug. 10, 2021	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Mar. 11, 2024	Dec. 31, 2023	Dec. 31, 2022
Restricted Cash and Cash Equivalents Items [Line Items]
Operating income (loss)				$ (26.9)	$ (42.8)	$ (71.1)	$ (81.9)
Net cash used in operating activities						(72.0)	$ (63.8)
Restricted cash				9.6		9.6			$ 9.7
Sale of stock, consideration received on transaction			$ 315.5
Restructuring and related cost, number of positions expected to be eliminated, percent	17.00%	17.00%
Glencore Convertible Notes
Restricted Cash and Cash Equivalents Items [Line Items]
Amount Issued				306.2		306.2
Glencore Convertible Notes \| Convertible Debt
Restricted Cash and Cash Equivalents Items [Line Items]
Amount Issued				300.3		300.3		$ 75.0	$ 225.3	$ 208.1
Waste Disposal Obligation Securities
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash				2.9		2.9
Bank Guarantee
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash				$ 5.5		$ 5.5