Arcadium Lithium (ALTM) 10-K 29 Feb 24 2023 FY Annual report Financial data

Cover

Cover - USD ($)	12 Months Ended
	Dec. 31, 2023	Jan. 31, 2024	Jun. 30, 2023
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2023
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-38694
Entity Registrant Name	ARCADIUM LITHIUM PLC
Entity Incorporation, State or Country Code	Y9
Entity Tax Identification Number	98-1737136
Entity Address, Address Line One	Suite 12, Gateway Hub
Entity Address, Address Line Two	Shannon Airport House
Entity Address, City or Town	Shannon, Co. Clare
Entity Address, Country	IE
Entity Address, Postal Zip Code	V14 E370
City Area Code	353-1
Local Phone Number	6875238
Title of 12(b) Security	Ordinary Shares, $1.00 par value per share
Trading Symbol	ALTM
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 4,896,548,501
Entity Common Stock, Shares Outstanding		1,074,397,786
Documents Incorporated by Reference	Portions of the registrant's definitive proxy statement to be filed with the Securities and Exchange Commission in connection with the registrant's annual meeting of shareholders or on an amendment on Form 10-K/A are incorporated by reference in Part III.
Entity Central Index Key	0001977303
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Amendment Flag	false

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2023
Audit Information [Abstract]
Auditor Name	KPMG LLP
Auditor Location	Philadelphia, PA
Auditor Firm ID	185

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement [Abstract]
Revenue	$ 882.5	$ 813.2	$ 420.4
Costs and expenses:
Costs of sales	413.2	417.5	332
Gross margin	469.3	395.7	88.4
Selling, general and administrative expenses	63.2	55.2	49.9
Research and development expenses	5.8	3.9	3
Restructuring and other charges	56.7	7.5	3.8
Separation-related costs	0	0.7	2
Total costs and expenses	538.9	484.8	390.7
Income from operations before equity in net loss of unconsolidated affiliate, interest expense, net, loss on debt extinguishment and other gain	343.6	328.4	29.7
Equity in net loss of unconsolidated affiliates	23.1	15.1	5.5
Interest expense, net	0	0	0.3
Loss on debt extinguishment	0	0.1	0
Other gain	(68.5)	(22.2)	0
Income from operations before income taxes	389	335.4	23.9
Income tax expense	58.9	61.9	23.3
Net income	$ 330.1	$ 273.5	$ 0.6
Net income per weighted average share - basic (in dollars per share)	$ 1.84	$ 1.59	$ 0
Net income per weighted average share - diluted (in dollars per share)	$ 1.58	$ 1.36	$ 0
Weighted average common shares outstanding - basic (in shares)	179.7	171.8	154.7
Weighted average common shares outstanding – diluted (in shares)	209.2	201.6	184.3

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income		$ 330.1	$ 273.5	$ 0.6
Foreign currency adjustments:
Foreign currency translation gain/(loss) arising during the period		1.2	(7.9)	1.3
Total foreign currency translation adjustments		1.2	(7.9)	1.3
Derivative instruments:
Unrealized hedging (losses)/gains, net of tax of zero, $0.2 and zero		(0.5)	(0.9)	0.3
Reclassification of deferred hedging losses/(gains) included in net income, net of tax of zero, $(0.2) and zero	[1]	0.5	0.7	(0.1)
Total derivative instruments		0	(0.2)	0.2
Other comprehensive income/(loss), net of tax		1.2	(8.1)	1.5
Comprehensive income		331.3	265.4	2.1
Comprehensive income attributable to the noncontrolling interest		0	0	0
Comprehensive income attributable to Arcadium Lithium plc		$ 331.3	$ 265.4	$ 2.1
[1] For more detail on the components of these reclassifications and the affected line item in the consolidated statements of operations, see Note 13 within these consolidated financial statements.

CONSOLIDATED STATEMENTS OF CO_2

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax [Abstract]
Unrealized hedging gains (losses) and other, tax	$ 0	$ 200,000	$ 0
Reclassification of deferred hedging losses included in net income, tax	$ 0	$ (200,000)	$ 0

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Current assets
Cash and cash equivalents	$ 237.6	$ 189
Trade receivables, net of allowance of approximately $0.3 in 2023 and $0.3 in 2022	106.7	141.6
Inventories, net	217.5	152.3
Prepaid and other current assets	86.4	61.1
Total current assets	648.2	544
Investments	34.8	440.3
Property, plant and equipment, net of accumulated depreciation of $269.1 in 2023 and $253.1 in 2022	2,237.1	968.3
Goodwill	120.7	0
Other intangibles, net	53.4	0
Deferred income taxes	1.4	0.4
Right of use assets - operating leases, net	6.8	4.8
Other assets	127.7	116.4
Total assets	3,230.1	2,074.2
Current liabilities
Short-term debt and current portion of long-term debt	2.4	0
Accounts payable, trade and other	115.4	81.7
Accrued and other liabilities	136.8	37.4
Contract liability - short-term	4.4	15.5
Operating lease liabilities - current	1.3	0.9
Income taxes	8.3	13.2
Total current liabilities	268.6	148.7
Long-term debt	299.6	241.9
Operating lease liabilities - long-term	5.6	4.2
Environmental liabilities	7	6.4
Deferred income taxes	126.4	16.1
Contract liability - long-term	217.8	198
Other long-term liabilities	21.3	15.9
Commitments and contingent liabilities (Note 16)	0	0
Total current and long-term liabilities	946.3	631.2
Equity
Common stock; $0.001 par value; 2 billion shares authorized; 179,991,665 and 179,652,125 shares issued; 179,882,077 and 179,548,550 outstanding at December 31, 2023 and 2022, respectively	0.1	0.1
Capital in excess of par value of common stock	1,170.4	1,160.4
Retained earnings	664.5	334.4
Accumulated other comprehensive loss	(49.8)	(51)
Treasury stock, common, at cost; 109,588 and 103,575 shares at December 31, 2023 and 2022, respectively	(1)	(0.9)
Total Livent stockholders’ equity	1,784.2	1,443
Noncontrolling interest	499.6	0
Total equity	2,283.8	1,443
Total liabilities and equity	$ 3,230.1	$ 2,074.2

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Allowance for trade receivable	$ 0.3	$ 0.3
Accumulated depreciation	$ 269.1	$ 253.1
Equity
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	2,000,000,000	2,000,000,000
Common stock, shares issued (in shares)	179,991,665	179,652,125
Shares of common stock outstanding (in shares)	179,882,077	179,548,550
Treasury stock, shares issued (in shares)	109,588	103,575

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash provided by operating activities:
Net income		$ 330.1	$ 273.5	$ 0.6
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization		29.6	27.7	25.1
Restructuring and other charges/(income)		28.1	4	(1.5)
Deferred income taxes		(4.4)	3.8	12.5
Share-based compensation		8.4	6.8	5.3
Change in investments in trust fund securities		(0.2)	(0.5)	0.6
Equity in net loss of unconsolidated affiliates		23.1	15.1	5.5
Other gain, Blue Chip Swap		(68.5)	(22.2)	0
Deferred financing fee amortization		0	0	0.3
Loss on asset disposal		0	1.4	0.5
Other non-cash adjustments		0	(0.1)	0
Changes in operating assets and liabilities:
Trade receivables, net		34.7	(51.1)	(19)
Changes in deferred compensation		1.8	(0.3)	1.4
Inventories		(68.9)	(22.9)	(28.2)
Accounts payable, trade and other		(17.2)	18.9	20.9
Contract liability - short-term		(11.1)	15.5	0
Contract liability - long-term		0	198	0
Income taxes		(4.7)	10.5	3
Change in prepaid and other current assets and other assets		32.5	(31.1)	(3.7)
Change in accrued and other liabilities and other long-term liabilities		(16)	7.7	3.1
Cash provided by operating activities		297.3	454.7	26.4
Cash used in investing activities:
Capital expenditures	[1]	(327.1)	(336.9)	(131.9)
Investments in Livent NQSP securities		(1.1)	(0.2)	(1.4)
Proceeds from Blue Chip Swap, net of purchases		68.5	22.2	0
Nemaska - cash & cash equivalents	[2]	133.5	0	0
Investments in unconsolidated affiliates		(88.7)	(47.1)	(8)
Other investing activities		(13.4)	(2.7)	(2)
Cash used in investing activities		(228.3)	(364.7)	(143.3)
Cash used in by financing activities:
Proceeds from Revolving Credit Facility		0	13	39.5
Repayments of Revolving Credit Facility		0	(13)	(75.1)
Payments of financing fees		0	(2.2)	0
Proceeds from issuance of common stock - incentive plans		1.6	3.2	1.5
Repayment of QLP Note		0	(13.5)	0
Payments of underwriting fees and expenses - Offering		0	0	(9.4)
Proceeds from Offering		0	0	261.6
Payment of deposit to customs authorities		(21.7)	0	0
Other financing activities		(0.3)	0	(0.1)
Cash used in by financing activities		(20.4)	(12.5)	218
Effect of exchange rate changes on cash and cash equivalents		0	(1.5)	0.3
Increase in cash and cash equivalents		48.6	76	101.4
Cash and cash equivalents, beginning of period		189	113	11.6
Cash and cash equivalents, end of period		237.6	189	113
Supplemental disclosure for cash flow:
Cash payments for income taxes, net of refunds	[3]	65.9	43.1	4.1
Cash payments for interest	[1]	11.7	12.3	13.3
Cash payments for Restructuring and other charges		28.7	3.5	5.3
Cash payments for Separation-related charges		0	0.9	2
Accrued capital expenditures		56.2	16.5	32.5
Accrued investment in unconsolidated affiliates		27	0.2	0
Non-cash assumption of QLP Note		0	13.5	0
Non-cash investment in unconsolidated affiliate		0	387.1	0
Operating lease right-of-use assets and lease liabilities recorded for ASC 842		$ 0.9	$ 0	$ 2.1
[1] For the years ended December 31, 2023, 2022, and 2021, $16.8 million , $15.8 million, and $15.4 million of interest was capitalized, respectively. On October 18, 2023 we began consolidating Nemaska Lithium, see Note 6 for details. The year ended December 31, 2023 includes refunds of $1.0 million relating to U.S. federal taxes. The year ended December 31, 2022 and 2021 include $1.0 million and $1.7 million of refunds relating to U.S. state taxes and foreign taxes, respectively.

CONSOLIDATED STATEMENTS OF CA_2

CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Capitalized interest costs	$ 16.8	$ 15.8	$ 15.4
Domestic Tax Authority
Income tax refunds	$ 1
State And Foreign Tax Authority
Income tax refunds		$ 1	$ 1.7

CONSOLIDATED STATEMENTS OF EQUI

CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Millions		Total		Common Stock, 0.001 Per Share Par Value	Capital In Excess of Par	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock	Noncontrolling Interest
Beginning balance at Dec. 31, 2020		$ 536.2		$ 0.1	$ 520.9	$ 60.3	$ (44.4)	$ (0.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		0.6				0.6
Stock compensation plans		5.3			5.3
Shares withheld for taxes - common stock issuances		(1.8)			(1.8)
Issuance of common stock - Offering/Issuance of common stock - QLP Merger		252.2			252.2
Net hedging gains (losses), net of income tax expense		0.2					0.2
Reclassification of deferred hedging losses, net of income tax	[1]	(0.1)
Foreign currency translation adjustments		1.3					1.3
Exercise of stock options		1.5			1.5
Net sales of treasury stock - Livent NQSP		(0.1)						(0.1)
Ending balance at Dec. 31, 2021		795.4		0.1	778.1	60.9	(42.9)	(0.8)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		273.5				273.5
Stock compensation plans		6.9			6.9
Shares withheld for taxes - common stock issuances		(1.7)			(1.7)
Issuance of common stock - Offering/Issuance of common stock - QLP Merger		373.9			373.9
Net hedging gains (losses), net of income tax expense		(0.9)					(0.9)
Reclassification of deferred hedging losses, net of income tax		0.7	[1]				0.7
Foreign currency translation adjustments		(7.9)					(7.9)
Exercise of stock options		3.2			3.2
Net sales of treasury stock - Livent NQSP		(0.1)						(0.1)
Ending balance at Dec. 31, 2022		1,443		0.1	1,160.4	334.4	(51)	(0.9)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		330.1				330.1
Stock compensation plans		9.5			9.5
Shares withheld for taxes - common stock issuances		(1.1)			(1.1)
Issuance of common stock - Offering/Issuance of common stock - QLP Merger		1.6			1.6
Net hedging gains (losses), net of income tax expense		(0.5)					(0.5)
Reclassification of deferred hedging losses, net of income tax		0.5	[1]				0.5
Foreign currency translation adjustments		1.2					1.2
Noncontrolling interest		499.6							499.6
Net sales of treasury stock - Livent NQSP		(0.1)						(0.1)
Ending balance at Dec. 31, 2023		$ 2,283.8		$ 0.1	$ 1,170.4	$ 664.5	$ (49.8)	$ (1)	$ 499.6
[1] For more detail on the components of these reclassifications and the affected line item in the consolidated statements of operations, see Note 13 within these consolidated financial statements.

CONSOLIDATED STATEMENTS OF EQ_2

CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - $ / shares	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Stockholders' Equity [Abstract]
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001	$ 0.001	$ 0.001

Description of the Business

Description of the Business	12 Months Ended
	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of the Business	Description of the Business Background and Nature of Operations Arcadium Lithium manufactures a wide range of lithium products, which are used primarily in lithium-based batteries, specialty polymers and chemical synthesis applications. We serve a diverse group of markets. A major growth driver for lithium in the future will be the increasing adoption of electric vehicles ("EVs") and other energy storage applications. On January 4, 2024, Arcadium Lithium completed the Allkem Livent Merger. On January 4, 2024, the Company's shares started trading on the New York Stock Exchange under the trading symbol ALTM. See Note 18 for more information. Livent, a Delaware corporation formed in 2018, now a wholly owned subsidiary of Arcadium Lithium, is a fully integrated lithium company, with a long, proven history of producing performance lithium compounds. Its primary products, namely battery-grade lithium hydroxide, lithium carbonate, butyllithium and high purity lithium metal, are critical inputs used in various performance applications.

Principal Accounting Policies a

Principal Accounting Policies and Related Financial Information	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Principal Accounting Policies and Related Financial Information	Principal Accounting Policies and Related Financial Information Basis of presentation and principles of consolidation . In this Annual Report on Form 10-K, because Arcadium Lithium plc is the successor company to Livent in the Allkem Livent Merger which closed on January 4, 2024, we are presenting the results of Livent’s operations for the years ended December 31, 2023, 2022 and 2021 and as of December 31, 2023. The financial statements of the Company presented in this Annual Report on Form 10-K do not include the financial position or operations of Allkem since the Allkem Livent Merger occurred subsequent to the end of the reporting period. Refer to Note 18 for further information related to the Allkem Livent Merger. The accompanying consolidated financial statements are presented on a consolidated basis and include all of the accounts and operations of Livent and its majority-owned subsidiaries. For entities that we control, but own less than 100%, we record the minority ownership as noncontrolling interest. The financial statements reflect the financial position, results of operations and cash flows of Arcadium Lithium in accordance with U.S. GAAP. All significant intercompany accounts and transactions are eliminated in consolidation. Earnings per share . The weighted average common shares outstanding for both basic and diluted earnings per share for all periods presented was calculated, in accordance with ASC 260, Earnings Per Share. Estimates and assumptions . In preparing the financial statements in conformity with U.S. GAAP we are required to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ materially from these estimates under different assumptions or conditions, but we do not believe such differences will materially affect our financial position, results of operations or cash flows. Cash equivalents . We consider investments in all liquid debt instruments with original maturities of three months or less to be cash equivalents. Trade receivables, net of allowance and other receivables . Trade receivables consist of amounts owed to us from customer sales and are recorded when revenue is recognized. The allowance for trade receivables represents our best estimate of the probable losses associated with potential customer defaults. In developing our allowance for trade receivables, we use a two stage process which includes calculating a formula to develop an allowance to appropriately address the uncertainty surrounding collection risk of our entire portfolio and specific allowances for customers where the risk of collection has been reasonably identified either due to liquidity constraints or disputes over contractual terms and conditions. Our method of calculating the formula consists of estimating the recoverability of trade receivables based on historical experience, current collection trends, and external business factors such as economic factors, including regional bankruptcy rates, and political factors. Our analysis of trade receivable collection risk is performed quarterly, and the allowance is adjusted accordingly. One of our subsidiaries that conducts business within Argentina has outstanding receivables due from the Argentina government, which primarily represent export tax and export rebate receivables. As with all outstanding receivable balances, we continually review recoverability by analyzing historical experience, current collection trends and regional business and political factors among other factors. Inventories . Inventories are stated at the lower of cost or net realizable value. Inventory costs include those costs directly attributable to products before sale, including all manufacturing overhead but excluding distribution costs. All inventories are determined on a first-in, first-out ("FIFO") basis. Property, plant and equipment . We record property, plant and equipment, including capitalized interest, at cost. We recognize acquired property, plant and equipment, from acquisitions at its estimated fair value. Depreciation is calculated principally on a straight-line basis over the estimated useful lives of the assets. The major classifications of property, equipment and software, including their respective expected useful lives, consisted of the following: Asset type Useful Life Land — Land improvements 20 years Buildings 20-40 years Mining rights 33 years Machinery and Equipment 3-18 years Software 3-10 years Gains and losses are reflected in income upon sale or retirement of assets. Expenditures that extend the useful lives of property, plant and equipment or increase productivity are capitalized. Ordinary repairs and maintenance are expensed as incurred through operating expense. Capitalized interest . For the years ended December 31, 2023, 2022 and 2021 we capitalized interest expense of $16.8 million , $15.8 million and $15.4 million, respectively. These costs were associated with the construction of certain long-lived assets and have been capitalized as part of the cost of those assets. We amortize capitalized interest over the estimated useful lives of the assets. Impairments of long-lived assets . We review the recoverability of the net book value of long-lived assets whenever events and circumstances indicate ("triggering events") that the net book value of an asset may not be recoverable from the estimated undiscounted future cash flows expected to result from its use and eventual disposition. In cases where a triggering event occurs and undiscounted expected future cash flows are less than the net book value, we recognize an impairment loss equal to an amount by which the net book value exceeds the fair value of the asset. Long-lived assets to be disposed of are reported at the lower of carrying amount or fair value less cost to sell. There were no significant impairments during the three years ended December 31, 2023. Asset retirement obligations . We record asset retirement obligations ("AROs") at present value at the time the liability is incurred if we can reasonably estimate the settlement date. The associated AROs are capitalized as part of the carrying amount of related long-lived assets. In future periods, the liability is accreted to its estimated fair value and the capitalized cost is depreciated over the useful life of the related asset. We also adjust the liability for changes resulting from the passage of time and/or revisions to the timing or the amount of the original estimate. Upon retirement of the long-lived asset, we either settle the obligation for its recorded amount or incur a gain or loss. We have mining operations and legal reclamation obligations related to our facilities upon closure of the mines. The AROs primarily relate to post-closure reclamation of brine wells and sites involved in the surface mining and manufacturing of lithium in Argentina. Also, we have obligations at certain of our manufacturing facilities and offices in the event of permanent plant shutdown. The carrying amounts for the AROs for the years ended December 31, 2023 and 2022 are $3.7 million and $0.2 million, respectively. These amounts are included in "Other long-term liabilities" on the consolidated balance sheets. Deferred compensation plan . We have established a trust fund administered by a third party to provide funding for benefits payable under the Livent Non-qualified Saving Plan ("Livent NQSP") to which highly compensated Livent employees can elect to defer part of their compensation. The assets held in the trust consist of money market investments, a managed portfolio of equity securities and Livent common stock. For each reporting period, the Company records a net mark-to-market adjustment to Selling, general and administrative expense in our consolidated statements of operations for the investments in the trust fund and the corresponding obligation to participants in the Livent NQSP. The money market investments and equity securities assets are included in Other assets in the accompanying consolidated balance sheets. The investments in Livent common stock under the Livent NQSP are included in Treasury stock on our consolidated balance sheets. The deferred compensation obligation to participants is included in Other long-term liabilities on our consolidated balance sheets. See Note 15 and Note 17 for additional details on the Livent NQSP deferred compensation plan. 4.125% Convertible Senior Notes due 2025 (the "2025 Notes") . We account for our 2025 Notes under Accounting Standards Update ("ASU") No. 2020-06, Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity's Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity's Own Equity ("ASU 2020-06"). Financial instruments . Our financial instruments include cash and cash equivalents, trade receivables, other current assets, investments held in trust fund, trade payables, debt, derivatives and amounts included in accruals meeting the definition of financial instruments. Trade receivables and trade payables are recorded at carrying value, which approximates fair value due to the short-term nature of the instruments. Investments held in trust are for the Livent NQSP as discussed in "Deferred compensation plan" subsection above. Livent enters into derivative contracts to hedge exposures and the associated assets or liabilities are recorded in our consolidated balance sheets and the gains or losses associated with these transactions are included in the consolidated statements of operations. Equity method investments . If facts and circumstances indicate that a decrease in value of the investment has occurred that is other than temporary, we recognize an impairment loss equal to an amount by which the carrying amount exceeds the fair value of the equity method investment. There were no impairments during the three years ended December 31, 2023. We began consolidating Nemaska Lithium on October 18, 2023, which was previously accounted for as an equity method investment. We had no equity method investments as of December 31, 2023. Leases. The Company determines if an arrangement is a lease at the inception of the contract. Our operating leases are included in Operating lease right-of-use ("ROU") assets, Operating lease liabilities - current, and Operating lease liabilities - long term in the consolidated balance sheets. The operating lease ROU assets and operating lease liabilities are recognized based on the present value of future minimum lease payments over the lease term at commencement date. As most of our leases do not provide an implicit interest rate, we utilize an estimated incremental borrowing rate based on the information available at commencement date in determining the present value of future payments. In determining the discount rate used in the present value calculation, the Company has elected to apply the portfolio approach for leases provided the leases commenced at or around the same time. This election allows the Company to account for leases at a portfolio level provided that the resulting accounting at this level would not differ materially from the accounting at the individual lease level. Lease expense for minimum lease payments is recognized on a straight-line basis over the lease term. The Company has elected not to separate lease and non-lease components and accounts for each separate lease component and non-lease component associated with that lease component as a single lease component. Operating lease ROU assets include all contractual lease payments and initial direct costs incurred less any lease incentives. Facility leases generally only contain lease expense and non-component items such as taxes and pass through charges. Additionally, we have elected not to apply the recognition requirements of ASC 842 to leases which have a lease term of less than one year at the commencement date. Most of the Company's leases for corporate facilities contain terms for renewal and extension of the lease agreement. The exercise of lease renewal options is generally at the Company’s sole discretion. The Company includes the lease extensions when it is reasonably certain we will exercise the extension. The Company’s lease agreements do not contain any material variable lease payments, material residual value guarantees or any material restrictive covenants. We currently do not have any finance leases. See Note 16 for information on related disclosures regarding leases. Restructuring and other charges . We continually perform strategic reviews and assess the return on our businesses. This sometimes results in a plan to restructure the operations of our business. We record an accrual for severance and other exit costs under the provisions of the relevant accounting guidance. Additionally, as part of these restructuring plans, write-downs of long-lived assets may occur. Two types of assets are impacted: assets to be disposed of by sale and assets to be abandoned. Assets to be disposed of by sale are measured at the lower of carrying amount or estimated net proceeds from the sale. Assets to be abandoned with no remaining future service potential are written down to amounts expected to be recovered. The useful life of assets to be abandoned that have a remaining future service potential are adjusted and depreciation is recorded over the adjusted useful life. Restructuring and other charges also includes transaction costs related to the Allkem Livent Merger. Finite-lived intangible assets . Finite-lived intangible assets consist of patents, which are amortized over a period of approximately 15 years. We evaluate the recovery of our finite-lived intangible assets by comparing the net carrying value of the asset group to the undiscounted net cash flows expected to be generated from the use and eventual disposition of that asset group when events or changes in circumstances indicate that its carrying amount may not be recoverable. If the carrying amount of the asset group is not recoverable, the fair value of the asset group is measured and if the carrying amount exceeds the fair value, an impairment loss is recognized. Goodwill . We account for goodwill and other intangibles acquired in a business combination in conformity with current accounting guidance, which requires goodwill and indefinite-lived intangible assets to not be amortized. On October 18, 2023, the Company consolidated Nemaska Lithium and recorded goodwill of $120.7 million primarily related to potential synergies arising from the proximity of Nemaska Lithium to other resources in the region. Nemaska Lithium was previously accounted for under the equity method of accounting, see Note 6 for details. The Company has elected a policy to perform its annual goodwill impairment test in the fourth quarter of each year as of October 31 and will perform its first annual goodwill impairment testing on October 31, 2024 or upon the occurrence of events or changes in circumstances that would more likely than not reduce the fair value of its reporting units below their carrying amounts. We test goodwill for impairment by comparing the estimated fair value of our reporting units to the related carrying value. Our reporting units are either our operating business segment or one level below our operating business segment for which discrete financial information is available and for which operating results are regularly reviewed by the business management. In applying the goodwill impairment test, the Company initially performs a qualitative test ("Step 0"), where it first assesses qualitative factors to determine whether it is more likely than not that the fair value of the reporting units is less than its carrying value. Qualitative factors may include, but are not limited to, economic conditions, industry and market considerations, cost factors, overall financial performance of the reporting units and other entity and reporting unit specific events. If after assessing these qualitative factors, the Company determines it is "more-likely-than-not" that the fair value of the reporting unit is less than the carrying value, the Company performs a quantitative test ("Step 1"). During Step 1, the Company estimates the fair value using a discounted cash flow model. Revenue recognition . Revenue from product sales is recognized when we satisfy a performance obligation by transferring the promised goods to a customer, that is, when control of the good transfers to the customer. The customer is then invoiced at the agreed-upon price with payment terms generally ranging from 30 to 180 days. See Note 4 for further details regarding revenue recognition. Research and Development . Research and development costs are expensed as incurred. Income and other taxes . We provide current income taxes on income reported for financial statement purposes adjusted for transactions that do not enter into the computation of income taxes payable and recognize deferred tax liabilities and assets for the expected future tax consequences of temporary differences between the carrying amounts and the tax basis of assets and liabilities. Prior to the Separation, pursuant to the tax matters agreement with FMC, in jurisdictions where we file consolidated returns with FMC, we have recorded our allocated share of the consolidated liability as part of the income tax payable in our consolidated balance sheets. In taxing jurisdictions where we file as a standalone entity we have recorded the tax liability/benefit to income tax payable/receivable. We do not provide income taxes on the equity in undistributed earnings of consolidated foreign subsidiaries as it is our intention that such earnings will remain invested in those companies. Segment information. We operate as one reportable segment based on the commonalities among our products and services and the manner in which we review and evaluate operating performance. Stock-based compensation . Stock-based compensation expense for the three years ended December 31, 2023 has been recognized for all share options and other equity-based arrangements. Stock-based compensation cost is measured at the date of grant, based on the fair value of the award, and is recognized over the employee’s requisite service period. We made a policy election to recognize forfeitures in stock-based compensation expense as they occur. See Note 12 for more information. Environmental obligations . We provide for environmental-related obligations when they are probable and amounts can be reasonably estimated. Included in our environmental liabilities are costs for the operation, maintenance and monitoring of site remediation plans ("OM&M"). Such reserves are based on our best estimates for these OM&M plans. Over time we may incur OM&M costs in excess of these reserves which could be significant. Environmental remediation charges represent the costs for the continuing charges associated with environmental remediation at operating sites from previous years and from products that are no longer manufactured. Livent has one environmental remediation site located in Bessemer City, North Carolina. The charge/(income) associated with the cost of remediation for the years ended December 31, 2023, 2022 and 2021 are $0.8 million, $1.2 million and $(0.3) million, respectively. These amounts are recorded as a component within "Restructuring and other charges" on the consolidated statements of operations. The total environmental remediation liability as of December 31, 2023 and 2022 was $7.5 million and $7.0 million, respectively. Foreign currency . We translate the assets and liabilities of our foreign operations at exchange rates in effect at the balance sheet date. For foreign operations for which the functional currency is not the U.S. dollar, we record translation gains and losses as a component of accumulated other comprehensive loss in equity. The foreign operations’ statements of operations are translated at the monthly exchange rates for the period. Transactions denominated in foreign currency other than our functional currency of the operation are recorded upon initial recognition at the exchange rate at the date of the transaction. After initial recognition, monetary assets and liabilities denominated in foreign currency are remeasured at each reporting date into the functional currency at the exchange rate at that date. Exchange rate differences are recognized as foreign currency transaction gain or loss recorded as a component of Costs of sales in our consolidated statements of operations. We recorded transaction and remeasurement losses of $68.9 million, $7.0 million and $10.3 million for the years ended December 31, 2023, 2022 and 2021, respectively. Blue Chip Swap .

Recently Issued and Adopted Acc

Recently Issued and Adopted Accounting Pronouncements and Regulatory Items	12 Months Ended
	Dec. 31, 2023
Accounting Standards Update and Change in Accounting Principle [Abstract]
Recently Issued and Adopted Accounting Pronouncements and Regulatory Items	Recently Issued and Adopted Accounting Pronouncements and Regulatory Items New Accounting guidance and regulatory items In December 2023, the Financial Accounting Standard Board ("FASB") issued ASU No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures . This ASU enhances existing income tax disclosures to better assess how an entity's operation and related tax risks, tax planning, and operational opportunities affect its tax rate and prospects for future cash flows. The ASU is effective for annual periods beginning after December 15, 2024. We are currently evaluating the effect the guidance will have on our consolidated financial statements. In November 2023, the FASB issued ASU No. 2023-07, Segment Reporting (Topic 280)

Revenue Recognition

Revenue Recognition	12 Months Ended
	Dec. 31, 2023
Revenue from Contract with Customer [Abstract]
Revenue Recognition	Revenue Recognition Disaggregation of revenue We disaggregate revenue from contracts with customers by geographical areas (based on product destination) and by product categories. The following table provides information about disaggregated revenue by major geographical region: Year Ended December 31, (in Millions) 2023 2022 2021 Asia Pacific (1) $ 649.7 $ 566.5 $ 296.8 North America (1) 143.8 145.7 61.4 Europe, Middle East & Africa 87.2 98.1 62.2 Latin America 1.8 2.9 — Total Revenue $ 882.5 $ 813.2 $ 420.4 ____________________ 1. In 2023, countries with sales in excess of 10% of combined revenue consisted of China, the U.S., Japan and South Korea. Sales for the year ended December 31, 2023 for China, the U.S., Japan and South Korea totaled $364.8 million, $138.7 million, $136.9 million, and $123.0 million, respectively. In 2022, countries with sales in excess of 10% of combined revenue consisted of China, Japan, and the U.S. S ales for the year ended December 31, 2022 for China, Japan, and the U.S. totaled $304.9 million, $167.6 million, and $139.1 million, respectively. In 2021, countries with sales in excess of 10% of combined revenue consisted of China, Japan, the U.S. and South Korea. Sales for the year ended December 31, 2021 for China, Japan, the U.S. and South Korea totaled $160.0 million, $75.1 million, $59.9 million and $43.6 million, respectively. For the year ended December 31, 2023, two customers accounted for approximately 28% and 22% of total revenue, and our 10 largest customers accounted in aggregate for approximately 72% of our revenue. For the years ended 2022 and 2021, one customer accounted for approximately 24% and 31% of total revenue, respectively and our 10 largest customers accounted in aggregate for approximately 63% and 69% of our revenue, respectively. A loss of any material customer could have a material adverse effect on our business, financial condition and results of operations. The following table provides information about disaggregated revenue by major product category: Year Ended December 31, (in Millions) 2023 2022 2021 Lithium Hydroxide $ 564.4 $ 415.5 $ 208.0 Butyllithium 227.6 277.7 105.4 High Purity Lithium Metal and Other Specialty Compounds 44.9 50.9 36.9 Lithium Carbonate and Lithium Chloride 45.6 69.1 70.1 Total Revenue $ 882.5 $ 813.2 $ 420.4 Our lithium products are developed and sold to global and regional customers in the EV, electronics, agrochemicals, pharmaceuticals, polymer and specialty alloy metals market among others. Lithium hydroxide products are used in advanced batteries for all-electric vehicles as well as other products that require portable energy storage such as power tools and military devices. Lithium hydroxide is also sold into grease applications for use in automobiles, aircraft, railcars, agricultural and other types of equipment. Butyllithium products are primarily used as polymer initiators, and in the synthesis of agrochemicals and pharmaceuticals. High purity lithium metal and other specialty compounds include lithium phosphate, pharmaceutical-grade lithium carbonate, high purity lithium chloride and specialty organics. Additionally, we sell whatever lithium carbonate and lithium chloride we do not use internally to our customers for various applications. Sale of Goods Revenue from product sales is recognized when we satisfy a performance obligation by transferring the promised goods to a customer, that is, when control of the good transfers to the customer. The customer is then invoiced at the agreed-upon price with payment terms generally ranging from 30 to 180 days. In determining when the control of goods is transferred, we typically assess, among other things, the transfer of title and risk of loss and the shipping terms of the contract. We record amounts billed for shipping and handling fees as revenue. Costs incurred for shipping and handling are recorded in cost of sales. When we perform shipping and handling activities after the transfer of control to the customer (e.g., when control transfers prior to delivery), they are considered fulfillment activities, and accordingly, the costs are accrued to cost of sales when the related revenue is recognized. Amounts billed for sales and use taxes, VAT, and certain excise and other specific transactional taxes imposed on revenue-producing transactions are presented on a net basis and excluded from revenue in the consolidated statements of operations. We record a liability until remitted to the respective taxing authority. Right of Return We warrant to our customers that our products conform to mutually agreed product specifications. We accrue for expected returns as they occur. Contract asset and contract liability balances We satisfy our obligations by transferring goods and services in exchange for consideration from customers. The timing of performance sometimes differs from the timing the associated consideration is received from the customer, thus resulting in the recognition of a contract liability. We recognize a contract liability if the customer’s payment of consideration is received prior to completion of our related performance obligation. On July 25, 2022 we entered into a long-term supply agreement with a customer to deliver battery-grade lithium hydroxide over six years between 2025 and 2030. The contract included an advance payment from the customer of $198 million, which we received in the third quarter of 2022. Revenue will be recognized as volumes are delivered. Any unrecognized deferred revenue is refundable if the agreement is terminated for any reason specified in the agreement. The following table presents the opening and closing balances of our contract liabilities and current trade receivables (including buy/sell arrangements), net of allowances from contracts with customers. Balance as of (in Millions) December 31, 2023 December 31, 2022 (Decrease)/increase Receivables from contracts with customers, net of allowances $ 106.7 $ 141.6 $ (34.9) Contract liability - short-term 4.4 15.5 (11.1) Contract liability - long-term 217.8 198.0 19.8 Performance obligations Revenue is recognized when the performance obligation is satisfied, which is when the customer obtains control of the good or service. Occasionally, we may enter into multi-year take or pay supply agreements with customers. The aggregate amount of revenue expected to be recognized related to these contracts' performance obligations that are unsatisfied or partially unsatisfied is approximately $1.9 billion in the next five years. These approximate revenues do not include amounts of variable consideration attributable to contract renewals or contract contingencies. Based on our past experience with the customers under these arrangements, we expect to continue recognizing revenue in accordance with the contracts as we transfer control of the product to the customer (refer to the sales of goods section for our determination of transfer of control). However, in the case a shortfall of volume purchases occurs, we will recognize the amount payable by the customer over the remaining performance obligations in the contract.

Inventories, Net

Inventories, Net	12 Months Ended
	Dec. 31, 2023
Inventory Disclosure [Abstract]
Inventories, Net	Inventories, Net Inventories consisted of the following: December 31, (in Millions) 2023 2022 Finished goods $ 59.1 $ 44.6 Semi-finished goods 108.8 57.1 Raw materials, supplies, and other 49.6 50.6 FIFO inventory, net $ 217.5 $ 152.3

Investments

Investments	12 Months Ended
	Dec. 31, 2023
Equity Method Investments and Joint Ventures [Abstract]
Investments	Investments ESM ILiAD, LLC ("ESM") In the fourth quarter of 2023, Arcadium Lithium entered into an agreement with EnergySource Minerals, LLC ("EnergySource"), a developer of lithium projects in the Salton Sea Known Geothermal Resource Area in California, for a minority equity interest in ESM, a subsidiary of EnergySource and the parent company of ILiAD Technologies, LLC ("ILiAD Technologies"). In connection with its investment in ESM, Arcadium Lithium will have the right to license ILiAD Technologies' Integrated Lithium Adsorption Desorption ("ILiAD") technology for potential deployment at its lithium brine resources in Argentina. Arcadium Lithium accounts for its interest in ESM under ASC Topic 321, Investments – Equity Securities ("ASC 321"). Since our investment in ESM does not have a readily determinable fair value, we use the measurement alternative under ASC 321. Our investment is measured at cost less impairments, adjusted for observable price changes in orderly transactions for the identical or similar investment of the same issuer. If the Company determines that an indicator of impairment or upward adjustment is present, an adjustment is recorded, which is measured as the difference between carrying value and estimated fair value. Estimated fair value is generally determined using an income approach on discounted cash flows or negotiated transaction values. As of December 31, 2023, the carrying amount of our investment in ESM is $30.1 million. Nemaska Lithium Inc. ("Nemaska Lithium", or "NLI") Nemaska Lithium, domiciled in Canada and headquartered in Montreal, Québec, is a non-public mining company not yet in the production stage. It is a development company aiming to vertically integrate, from extracting, processing and concentrating spodumene to conversion of spodumene into battery grade lithium hydroxide, primarily intended for energy storage applications. Its primary assets are construction in progress and intangibles principally related to intellectual property. Nemaska Lithium intends to develop the Whabouchi spodumene mine and concentrator in the James Bay region of Québec and a lithium hydroxide conversion plant in Bécancour, Québec (collectively, the "Nemaska Lithium Project"). As a developing company and to fund the Nemaska Lithium Project, Nemaska Lithium is reliant on securing financing from its shareholders through share subscriptions. In December 2019, Nemaska Lithium and certain affiliates filed for creditor protection in Canada under the Companies’ Creditors Arrangement Act (the "CCAA") in the Superior Court of Québec (the "CCAA Court"). In October 2020, the CCAA Court approved a sale of Nemaska Lithium structured as a credit bid under the CCAA to a group made up of Orion Mine Finance ("Orion"), Investissement Québec ("IQ", a company established by the Government of Québec to favor investment in Québec by Québec-based and international companies) and The Pallinghurst Group ("Pallinghurst", acting through a new entity named Québec Lithium Partners (UK) Limited ("QLP")). After a series of amalgamations and restructurings, the sale transactions were completed on December 1, 2020, pursuant to which IQ and QLP each acquired a 50% equity interest in Nemaska Lithium. In the fourth quarter of 2020, Livent entered into an agreement with Pallinghurst for a 50% equity interest in QLP. Through this investment, Livent obtained indirect ownership of a 25% equity interest in Nemaska Lithium. On June 6, 2022, Livent issued 17,500,000 shares of its common stock to acquire the remaining 50% share of QLP previously owned by Pallinghurst and certain of its investors (the "QLP Merger"). Upon consummation of the QLP Merger, Livent recorded an Investment of $387.1 million, QLP's cash and cash equivalents of $0.3 million and short-term debt of $13.5 million; and an increase to additional paid in capital of $373.9 million. Livent now owns a 50% economic interest in NLI through its ownership of QLP. The Québec provincial government, through IQ, continues to own the remaining 50% interest in Nemaska Lithium. At present, we do not have off-take rights on the production to come out of the Nemaska Lithium Project. On October 18 2023, we entered into an amendment to our shareholders agreement with Nemaska Lithium, and also amendments to certain related service agreements. The amendments to these agreements provide QLP with control of certain substantive participating rights, and as such, the Company began to consolidate Nemaska Lithium as of October 18, 2023. Nemaska Lithium is a development company which, as of the October 18, 2023 consolidation date, met the U.S. GAAP definition of a business and, as such, the Company remeasured its equity interest in Nemaska, including the noncontrolling interest of IQ, at fair value as of the consolidation date. We estimated the fair value of IQ's noncontrolling interest by multiplying the total fair value of Nemaska Lithium equity by IQ's equity ownership interest and also considered any discounts for lack of control and marketability. The fair value of the assets and liabilities of Nemaska Lithium assumed under business combination accounting guidance for the Nemaska Lithium consolidation, including the impact of income taxes, is preliminary. The preliminary fair value allocation is subject to change for up to one year subsequent to the October 18, 2023 consolidation date of Nemaska Lithium. Determining the fair value of the assets and liabilities of Nemaska Lithium requires judgment and certain assumptions to be made, the most significant of these being related to the valuation of Nemaska Lithium's mining properties and rights. Nemaska Lithium is consolidated on a one-quarter lag basis. The table below represents Nemaska Lithium's balance sheet at fair value consolidated by the Company as of October 18, 2023: Nemaska Lithium Inc. October 18, (in Millions) Note 2023 (a) ASSETS Cash and cash equivalents $ 133.5 Sales tax receivable 9.2 Prepaid expenses 3.4 Total current assets 146.1 In-trust deposits b 9.9 Property, plant and equipment c 925.2 Goodwill d 120.7 Intangible assets e 52.0 Other non-current assets 0.5 Total non-current assets 1,108.3 Total assets $ 1,254.4 LIABILITIES AND EQUITY Current portion of long-term debt f $ 2.4 Accounts payable and accrued liabilities 59.8 Total current liabilities 62.2 Long-term debt g 56.1 Contract liability - long-term g 19.8 Asset retirement obligations h 3.4 Deferred income taxes 113.4 Other non-current liabilities 0.3 Total non-current liabilities 193.0 Total current and long-term liabilities 255.2 Livent stockholders’ equity 499.6 Noncontrolling interest 499.6 Total equity 999.2 Total liabilities and equity $ 1,254.4 a. Represents the Nemaska Lithium balance sheet as of the October 18, 2023 consolidation date. b. Represents a deposit held in trust for estimated restoration costs relating to the Whabouchi site asset retirement obligation. c. Primarily represents mining property, mining rights and construction in progress for the Whabouchi and Bécancour sites related to project engineering, equipment and site preparation and capitalized financing costs. d. Primarily related to potential synergies arising from the proximity of Nemaska Lithium to other resources in the region. e. Primarily represents intellectual property in relation to patents and development costs with a weighted average amortization period of 15 years. f. Represents current portion of the unsecured obligation governing the working relationship between the Nemaska Lithium Project and the Cree Nation of Nemaska. g. Primarily represents $75.0 million for the prepayment received for a customer supply agreement entered on October 18, 2023, recorded net of imputed discount of $19.8 million. h. Represents the asset retirement obligation for estimated inflation-adjusted and discounted future costs associated with mine reclamation and closure activities at the Whabouchi site, and assuming that the disbursements would be made in 2056. Before October 18, 2023, the Company accounted for its interest in Nemaska Lithium as an equity method investment on a one-quarter lag basis and it was included in Investments in our consolidated balance sheets. The carrying amount of our interest in Nemaska Lithium was $437.1 million as of December 31, 2022 under equity method investment accounting. For the years ended December 31, 2023, 2022, and 2021 we recorded a $23.1 million, $15.1 million, and $5.5 million loss, respectively, related to our interest in Nemaska Lithium to Equity in net loss of unconsolidated affiliate in our consolidated statements of operations. The following summarized financial data for Nemaska Lithium present, on a one-quarter lag basis, the assets, liabilities, equity, results of operations and cash flows for Nemaska Lithium for periods in which it was a significant unconsolidated affiliate: Nemaska Lithium Inc. December 31, (in Millions) Note 2022 (a) 2021 (a) ASSETS Cash and cash equivalents $ 5.9 $ 10.3 Sales tax receivable 2.5 0.4 Prepaid expenses 0.6 0.6 Other current assets 0.1 — Assets held for sale 1.0 1.1 Total current assets 10.1 12.4 In-trust deposits b 8.9 7.3 Property, plant and equipment, net of accumulated depreciation of $0.7 in 2022 and $0.6 in 2021 c 166.6 176.3 Intangible assets d 29.5 31.9 Total non-current assets 205.0 215.5 Total assets $ 215.1 $ 227.9 LIABILITIES AND EQUITY Current portion of long-term debt e $ 35.7 $ 2.7 Accounts payable and accrued liabilities 4.1 2.1 Current portion of financial liability f 0.5 9.5 Total current liabilities 40.3 14.3 Long-term debt g — 30.5 Non-current portion of unsecured obligation h 2.3 5.1 Asset retirement obligations i 6.9 6.4 Other non-current liabilities 0.4 — Total non-current liabilities 9.6 42.0 Total current and long-term liabilities 49.9 56.3 Share capital j 115.0 71.6 Contributed surplus 24.0 25.8 Retained earnings 26.2 74.2 Total equity 165.2 171.6 Total liabilities and equity $ 215.1 $ 227.9 ________________________ a. Represents September 30, 2022 and September 30, 2021, respectively, for Nemaska Lithium on a one-quarter lag basis, as allowed under ASC 323. b. Represents a deposit held in trust for estimated restoration costs relating to the Whabouchi site asset retirement obligation (note i). c. Primarily represents construction in progress for the Whabouchi site related to project engineering, equipment and site preparation and capitalized financing costs. d. Primarily represents intellectual property in relation to patents and development costs. e. Includes $33.2 million representing current portion of the Orion promissory note and $2.5 million related to the unsecured obligation governing the working relationship between the Nemaska Lithium Project and the Cree Nation of Nemaska (see Note h). f. Includes a bankruptcy restructuring obligation due to a supplier that was paid in the first quarter of 2022. g. Represents a promissory note to Orion. The Orion note bears interest at 8%, matured November 26, 2022, and was secured by Nemaska Lithium's tangible and intangible assets. h. Represents an unsecured obligation governing the working relationship between the Nemaska Lithium Project and the Cree Nation of Nemaska. The obligation bears interest at 4.75% per annum, matures in September 2024, and is repaid in quarterly installments. i. Represents the asset retirement obligation for estimated inflation-adjusted and discounted future costs associated with mine reclamation and closure activities at the Whabouchi site, and assuming that the disbursements would be made in 2056. j. For the twelve months ended September 30, 2022 and the ten months ended September 30, 2021, Nemaska Lithium issued 20 million and 60 million shares, respectively, for cash proceeds of $50.6 million and $70.2 million, respectively. An unlimited number of shares are authorized without par value. Nemaska Lithium Inc. (in Millions) Year Ended December 31, Note 2023 (a) 2022 (a) 2021 (a) Summary of Statement of Operations Information: Operating costs b $ 30.7 $ 25.7 $ 11.5 General and administrative costs c 16.7 14.2 8.0 Other (income)/costs d (1.3) 4.3 2.5 Net loss from operations before income taxes (46.1) (44.2) (22.0) Income tax benefit — — (0.2) Net loss $ (46.1) $ (44.2) $ (21.8) _________________________ a. Represents the nine months and 17 days ended July 17, 2023, the twelve months ended September 30, 2022 and the ten months ended September 30, 2021 (our initial investment was made on December 1, 2020), respectively, for Nemaska Lithium on a one-quarter lag basis, as allowed under ASC 323, all prior to consolidation of Nemaska Lithium on October 18, 2023. b. Primarily includes construction management and engineering consulting fees. c. Primarily includes employee compensation, rent, office and other expenses and professional fees. d. Primarily includes finance (income)/costs and foreign exchange gains and losses. Nemaska Lithium Inc. (in Millions) Year Ended December 31, Note 2022 (a) 2021 (a) Cash used in operating activities $ (41.6) $ (15.0) Cash used in investing activities: Additions to property, plant and equipment (1.4) — Purchases of intangible assets (0.1) — Proceeds from sale of assets — 0.3 Increase in deposit to suppliers — (0.8) Cash used in investing activities $ (1.5) $ (0.5) Cash provided by financing activities: Proceeds from issuance of shares b 50.6 70.2 Debt repayment (8.8) (50.0) Payment of unsecured obligation (2.6) (2.7) Cash provided by financing activities $ 39.2 $ 17.5 Effect of exchange rate changes on cash and cash equivalents (0.5) 0.6 (Decrease)/increase in cash and cash equivalents (4.4) 2.6 Cash and cash equivalents, beginning of period 10.3 7.7 Cash and cash equivalents, end of period $ 5.9 $ 10.3 _________________________ a. Represents the twelve months ended September 30, 2022 and the ten months ended September 30, 2021, respectively, for Nemaska Lithium on a one-quarter lag basis, as allowed under ASC 323. b.

Property, Plant and Equipment,

Property, Plant and Equipment, Net	12 Months Ended
	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment, Net	Property, Plant and Equipment, Net Property, plant and equipment consisted of the following: December 31, (in Millions) 2023 2022 Land and land improvements $ 106.2 $ 87.0 Buildings 134.9 85.8 Machinery and equipment 420.7 333.4 Mineral rights (1) 560.0 — Construction in progress 1,284.4 715.2 Total cost $ 2,506.2 $ 1,221.4 Accumulated depreciation (269.1) (253.1) Property, plant and equipment, net $ 2,237.1 $ 968.3 _______________ 1. On October 18, 2023 we began consolidating Nemaska Lithium, see Note 6 for details. Depreciation expense was $26.6 million, $25.1 million, and $22.9 million in 2023, 2022 and 2021, respectively.

Restructuring and Other Charges

Restructuring and Other Charges	12 Months Ended
	Dec. 31, 2023
Restructuring and Related Activities [Abstract]
Restructuring and Other Charges	Restructuring and Other Charges The following table shows total restructuring and other charges included in the consolidated statements of operations: Year Ended December 31, (in Millions) 2023 2022 2021 Restructuring charges: Severance-related and exit costs $ 2.4 $ 1.8 $ 0.2 Other charges: Cost related to the Allkem Livent Merger 54.1 2.9 — Environmental remediation 0.8 1.2 (0.3) Other (0.6) 1.6 3.9 Total restructuring and other charges $ 56.7 $ 7.5 $ 3.8 Bessemer City Plant Fire On June 26, 2023, a fire broke out at Livent's 800-acre manufacturing facility in Bessemer City, North Carolina. The fire was principally contained to a steel and concrete warehouse which was used primarily to store lithium metal ingots, as well as some ancillary maintenance and production supplies. The warehouse and its contents were destroyed by the fire. There were no injuries and to our knowledge no toxic chemicals or compounds were on fire or released into the environment. All lithium hydroxide, butyllithium and catalyst grade lithium metal production lines were back in operation by June 29, 2023. The production unit for pharmaceutical grade lithium carbonate was able to resume operation in October 2023, and the production unit for high purity lithium metal resumed operations in January 2024. Construction to rebuild the warehouse is anticipated to begin in the second quarter of 2024 and the work is expected to be completed by the end of 2024.

Environmental Obligations

Environmental Obligations	12 Months Ended
	Dec. 31, 2023
Environmental Remediation Obligations [Abstract]
Environmental Obligations	Environmental Obligations We are subject to various federal, state, local and foreign environmental laws and regulations that govern emissions of air pollutants, discharges of water pollutants, and the manufacturing, storage, handling and disposal of hazardous substances, hazardous wastes and other toxic materials and remediation of contaminated sites. We are also subject to liabilities arising under the Comprehensive Environmental Response, Compensation and Liability Act ("CERCLA") and similar state laws that impose responsibility on persons who arranged for the disposal of hazardous substances, and on current and previous owners and operators of a facility for the clean-up of hazardous substances released from the facility into the environment. We are also subject to liabilities under the Resource Conservation and Recovery Act ("RCRA") and analogous state laws that require owners and operators of facilities that have treated, stored or disposed of hazardous waste pursuant to a RCRA permit to follow certain waste management practices and to clean up releases of hazardous substances into the environment associated with past or present practices. In addition, when deemed appropriate, we enter certain sites with potential liability into voluntary remediation compliance programs, which are also subject to guidelines that require owners and operators, current and previous, to clean up releases of hazardous substances into the environment associated with past or present practices. Environmental liabilities consist of obligations relating to waste handling and the remediation and/or study of sites at which we are alleged to have released or disposed of hazardous substances. As of the periods presented, the Bessemer City site located in North Carolina is the only site for which we have a reserve. We have provided reserves for potential environmental obligations that we consider probable and for which a reasonable estimate of the obligation can be made. Accordingly, total reserves of $7.5 million and $7.0 million existed for the years ended December 31, 2023 and 2022, respectively. The estimated reasonably possible environmental loss contingencies exceed amount accrued by approximately $2.1 million at December 31, 2023. This reasonably possible estimate is based upon information available as of the date of the filing and the actual future losses may be higher given the uncertainties regarding the status of laws, regulations, enforcement policies, the impact of potentially responsible parties, technology and information related to the site. Although potential environmental remediation expenditures in excess of the reserves and estimated loss contingencies could be significant, the impact on our future consolidated financial results is not subject to reasonable estimation due to numerous uncertainties concerning the nature and scope of possible contamination, identification of remediation alternatives under constantly changing requirements, selection of new and diverse clean-up technologies to meet compliance standards, and the timing of potential expenditures. The liabilities arising from potential environmental obligations that have not been reserved for at this time may be material to results of operations in the future. The table below is a roll forward of our total environmental reserves. (in Millions) Environmental Reserves Total Balance as of December 31, 2021 $ 6.1 Change in reserves 1.2 Cash payments (0.3) Balance as of December 31, 2022 $ 7.0 Change in reserves 0.8 Cash payments (0.3) Balance as of December 31, 2023 $ 7.5 The table below provides detail of current and long-term environmental reserves. December 31, (in Millions) 2023 2022 Environmental reserves, current (1) $ 0.5 $ 0.6 Environmental reserves, long-term (2) 7.0 6.4 Total environmental reserves $ 7.5 $ 7.0 ______________ 1. These amounts are included within "Accrued and other liabilities" on the consolidated balance sheets. 2. These amounts are included in "Environmental liabilities" on the consolidated balance sheets.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Domestic and foreign components of income from operations before income taxes are shown below: Year Ended December 31, (in Millions) 2023 2022 2021 Domestic $ 34.8 $ 133.2 $ (15.2) Foreign 354.2 202.2 39.1 Total $ 389.0 $ 335.4 $ 23.9 The provision for income taxes attributable to income from operations consisted of: Year Ended December 31, (in Millions) 2023 2022 2021 Current: Federal $ 31.7 $ 43.7 $ 1.7 Foreign 27.6 5.6 2.6 State 0.6 1.3 — Total current $ 59.9 $ 50.6 $ 4.3 Deferred: Federal $ 4.5 $ (1.9) $ 1.3 Foreign (5.9) 13.3 17.7 State 0.4 (0.1) — Total deferred (1.0) 11.3 19.0 Total $ 58.9 $ 61.9 $ 23.3 The effective income tax rate applicable to income from operations before income taxes was different from the statutory U.S. federal income tax rate due to the factors listed in the following table: Year Ended December 31, (in Millions) 2023 2022 2021 U.S. Federal statutory rate $ 81.7 $ 70.4 $ 5.1 Foreign earnings subject to different tax rates (78.9) (30.0) (1.2) Foreign derived intangible income (0.9) (2.1) (0.7) State and local income taxes, less federal income tax benefit 0.9 0.9 — Tax on intercompany dividends and deemed dividends for tax purposes 27.7 19.8 3.8 Changes to unrecognized tax benefits 0.4 (0.5) (0.9) Other permanent items 1.3 (2.8) (0.9) Change in valuation allowance (1) 66.0 (1.7) 4.4 Exchange gains and losses (2) (43.0) 6.9 12.7 Withholding taxes net of credits 4.7 0.6 0.8 Other (1.0) 0.4 0.2 Total tax provision $ 58.9 $ 61.9 $ 23.3 ____________________ 1. For the year ended December 31, 2023, the company recorded a valuation allowance of $60.3 million in 2023 to the statement of operations on the net deferred tax assets in Argentina, primarily relating to the net operating loss as a result of the significant fluctuations in foreign currency. These significant fluctuations in foreign currency impacts primarily occurred in December 2023. 2. Includes the impact of foreign currency exchange gains or losses in Argentina on net monetary assets for which no corresponding tax expense or benefit is realized and the tax provision for statutory taxable gains or losses in foreign jurisdictions for which there is no corresponding amount in income before taxes. Additionally, the years ended December 31, 2023, 2022 and 2021 include an adjustment relating to inflation. Significant components of our deferred tax assets and liabilities were attributable to: Year Ended December 31, (in Millions) 2023 2022 Net operating loss carry-forwards and credits (1)(2) $ 239.2 $ 19.2 Exploration and development expenses (2) 12.0 — Other assets and reserves 29.5 13.9 Deferred tax assets $ 280.7 $ 33.1 Valuation allowance, net (3) (83.1) (2.8) Deferred tax assets, net of valuation allowance $ 197.6 $ 30.3 Property, plant and equipment, net (2) (281.8) (17.0) Intangibles (11.8) — Deferred inflationary gain (28.4) (28.4) Other liabilities (0.6) (0.6) Deferred tax liabilities (322.6) (46.0) Net deferred tax liabilities $ (125.0) $ (15.7) ___________________ 1. The year ended December 31, 2023 primarily relates to net operating losses generated in Argentina and Canada. The net operating losses in Canada relate to Nemaska Lithium, see Note 6 for details. 2. On October 18, 2023 we began consolidating Nemaska Lithium, see Note 6 for details. The company recorded $137.8 million of net operating loss carry-forwards and credits and $(188.4) million relating to property, plant and equipment, net. 3. For the year ended December 31, 2023, the company recorded a valuation allowance in 2023 on the net deferred tax assets in Argentina, primarily relating to the net operating loss as a result of the significant fluctuations in foreign currency. These significant fluctuations in foreign currency impacts primarily occurred in December 2023. The balance at the end of the year is $80.2 million. We evaluate our deferred income taxes quarterly to determine if valuation allowances are required or should be adjusted. U.S. GAAP requires companies to assess whether valuation allowances should be established against deferred tax assets based on all available evidence, both positive and negative, using a "more likely than not" standard. In assessing the need for a valuation allowance, appropriate consideration is given to all positive and negative evidence related to the realization of deferred tax assets. This assessment considers, among other matters, the nature and severity of current and cumulative losses, forecasts of future profitability, the duration of statutory carry-forward periods, and tax planning alternatives. The company recorded a valuation allowance of $80.2 million to the balance sheet in 2023 on the net deferred tax assets in Argentina, primarily relating to the net operating loss as a result of the significant fluctuations in foreign currency. As of December 31, 2023, we had total foreign net operating loss carry-forwards of $233.1 million (tax effected) primarily related to Argentina and Canada and expiring within 5 years and within 20 years, respectively. The net operating losses in Canada relate to Nemaska Lithium, see Note 6 for details. As of December 31, 2022, we had total foreign net operating loss carry-forwards of $17.6 million (tax effected) primarily related to Argentina and expiring within 5 years. Income taxes are not provided for any additional outside basis differences inherent in our investments in subsidiaries because the investments and related unremitted earnings are essentially permanent in duration or we have concluded that no additional tax liability will arise upon disposal. Determining the amount of unrecognized deferred tax liability related to any remaining undistributed foreign earnings is not practicable due to the complexity of the hypothetical calculation. Uncertain Income Tax Positions U.S. GAAP accounting guidance for uncertainty in income taxes prescribes a model for the recognition and measurement of a tax position taken or expected to be taken in a tax return, and provides guidance on derecognition, classification, interest and penalties, disclosure and transition. We file tax returns in various jurisdictions. Pursuant to the TMA with FMC we have recorded amounts in uncertain tax positions at December 31, 2018 for tax positions that relate to our legacy business before IPO. In jurisdictions where we filed consolidated returns with FMC, and did not maintain the entity at IPO, our uncertain tax positions have been reduced as of December 31, 2023. We have recorded a $1.0 million indemnification asset from FMC regarding uncertain tax positions that are related to our legacy business before IPO and for which we are indemnified by FMC. Our significant foreign jurisdictions, which total two, are open for examination and adjustment during varying periods from 2016 - 2022. As of December 31, 2023, we had total unrecognized tax benefits of $4.7 million, of which $2.0 million would favorably impact the effective tax rate from operations if recognized. As of December 31, 2022, we had total unrecognized tax benefits of $4.5 million. As of December 31, 2021, we had total unrecognized tax benefits of $2.9 million. Interest and penalties related to unrecognized tax benefits are reported as a component of income tax expense. For the years ended December 31, 2023, 2022 and 2021, we recognized interest and penalties of $0.3 million, $0.2 million, and $(0.1) million, respectively, in the consolidated statement of operations. As of December 31, 2023 and 2022, we have accrued interest and penalties in the consolidated balance sheets of $1.1 million and $0.8 million, res pectively. Due to the potential for resolution of federal, state, or foreign examinations, and the expiration of various jurisdictional statutes of limitation, it is reasonably possible that our liability for unrecognized tax benefits will decrease within the next 12 months by a range of zero to $3.9 million. A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows: (in Millions) 2023 2022 2021 Balance at beginning of year $ 4.5 $ 2.9 $ 2.7 Increases related to positions taken in the current year 0.4 3.3 — Decreases related to positions taken in prior years — — (1.6) Increases related to positions taken in prior years — — 1.9 Decreases related to lapse of statutes of limitations (0.2) (0.1) (0.1) Settlement of uncertain tax positions — (1.6) — Balance at end of year $ 4.7 $ 4.5 $ 2.9

Debt

Debt	12 Months Ended
	Dec. 31, 2023
Debt Disclosure [Abstract]
Debt	Debt Long-term debt Long-term debt consists of the following: Interest Rate Percentage Maturity December 31, 2023 December 31, 2022 (in Millions) SOFR borrowings Base rate borrowings Revolving Credit Facility (1) 7.20% 9.25% 2027 $ — $ — 4.125% Convertible Senior Notes due 2025 4.125% 2025 245.8 245.8 Transaction costs - 2025 Notes (2.4) (3.9) Nemaska - Prepayment agreement (2) 8.9% 75.0 — Discount - Prepayment agreement (19.8) — Nemaska - Other 3.4 — Subtotal long-term debt (including current maturities) 302.0 241.9 Less current maturities (2.4) — Total long-term debt $ 299.6 $ 241.9 ______________________________ 1. As of December 31, 2023 and December 31, 2022, there were $15.5 million and $14.9 million, respectively, in letters of credit outstanding under our Revolving Credit Facility and $484.5 million and $485.1 million available funds as of December 31, 2023 and December 31, 2022, respectively. Fund availability is subject to the Company meeting its debt covenants. 2. Represents first advance payment in connection with customer supply agreement repayable in equal quarterly installments beginning in January 2027 and ending in October 2031. Represents U.S. GAAP imputed interest rate. 4.125% Convertible Senior Notes due 2025 In 2020, the Company issued $245.8 million in aggregate principal amount of 4.125% Convertible Senior Notes due in July 2025 (the "2025 Notes"). The 2025 Notes are our general unsecured senior obligations. Total net cash proceeds received were $238.2 million net of $7.6 million of third-party transaction costs, including initial purchasers' discounts and commissions. The Company used or will use the net proceeds received to finance or refinance eligible green projects designed to align with the provisions of the International Capital Market Association Green Bond Principles 2018. Each $1,000 of principal of the 2025 Notes was initially convertible into 114.4885 shares of common stock of Livent Corporation, which was equivalent to an initial conversion price of $8.73 per share, subject to adjustment upon the occurrence of specified events. Following the effectiveness of that certain First Supplemental Indenture, dated as of January 4, 2024, by and among the Company, Livent Corporation and U.S. Bank Trust Company, National Association, each $1,000 of principal of the 2025 Notes is convertible into 275.459331 shares of our common stock, which is equivalent to a conversion price of $3.63 per share, subject to adjustment upon the occurrence of specified events. We may redeem for cash all or any portion of the 2025 Notes, at our option, if the last reported sale price of our common stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period (including the last trading day of such period) ending on, and including, the trading day immediately preceding the date on which we provide notice of redemption at a redemption price equal to 100% of the principal amount of the 2025 Notes to be redeemed, plus accrued and unpaid interest. Holders of the 2025 Notes may convert their notes at any time, at their option, on or after January 15, 2025. Further, holders of the 2025 Notes may convert their notes at any time, at their option, prior to January 15, 2025 only under the following circumstances: (1) during any calendar quarter commencing after September 30, 2020 (and only during such calendar quarter), if the last reported sale price of our common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each trading day; (2) during the five-business day period after any five-consecutive trading day period in which the trading price per $1,000 principal amount of the 2025 Notes for each trading day of such period is less than 98% of the product of the last reported sale price of our common stock and the conversion rate on each such trading day, (3) if we call any or all of the 2020 Notes for redemption, at any time prior to the close of business on the scheduled trading day immediately preceding the redemption date or (4) if specified corporate events occur. Upon conversion, the 2025 Notes will be settled in cash, shares of our common stock or a combination thereof, at our election. If a fundamental change occurs prior to the maturity date, holders of the 2025 Notes may require us to repurchase all or a portion of their 2025 Notes for cash at a repurchase price equal to 100% of the principal amount plus any accrued and unpaid interest. In addition, if specific corporate events occur prior to the maturity date or if we deliver a notice of redemption, we will increase the conversion rate for a holder who elects to convert its 2025 Notes in connection with such an event or notice of redemption in certain circumstances. In the first quarter of 2024, the holders of the 2025 Notes were notified that the last reported sale price of Livent Corporation's common stock for at least 20 trading days (whether or not consecutive) during the period of 30 consecutive trading days ending on, and including, December 31, 2023 was greater than or equal to 130% of the conversion price then in effect on each trading day, and as a result, the holders have the option to convert all or any portion of their 2025 Notes through March 31, 2024. The 2025 Notes are classified as long-term debt. The Company recorded interest expense related to the amortization of transaction costs of $1.5 million for each of the years ended December 31, 2023 and 2022, all of which was capitalized. The Company recorded $10.1 million and $10.2 million of accrued interest expense related to the principal amount for the years ended December 31, 2023 and 2022, respectively, all of which was capitalized. Amended and Restated Credit Agreement, (the "Revolving Credit Facility") On January 4, 2024, Livent Corporation, Livent USA Corp., the Company, Arcadium Lithium Financing IRL Limited ("FinCo") and Irish IntermediateCo (collectively, the "Borrowers" and, each, a "Borrower"), the guarantors party thereto from time to time (the "Guarantors"), the lenders party thereto (the "Lenders") and issuing banks party thereto and Citibank, N.A., as administrative agent (the "Administrative Agent") for the Lenders, entered into a Joinder and First Amendment (the "Credit Agreement Amendment") to that certain Amended and Restated Credit Agreement, dated as of September 1, 2022, among Livent, Livent USA Corp., the guarantors party thereto from time to time, the lenders party thereto from time to time and the Administrative Agent (the "Credit Agreement" and as amended by the Credit Agreement Amendment, the The Credit Agreement Amendment provided for, among other things, (i) the addition of Arcadium, Irish IntermediateCo and FinCo as borrowers and obligors under the Amended Credit Agreement and (ii) the assignment of certain of Livent Corporation's rights and obligations (including information reporting obligations) under the Amended Credit Agreement to Arcadium. The Revolving Credit Facility provides for a $500 million senior secured revolving credit facility, $50 million of which is available for the issuance of letters of credit for the account of the Borrowers, with an option to request, and subject to each Lender’s sole discretion, that the aggregate revolving credit commitments be increased to up to $700 million. The issuance of letters of credit and the proceeds of revolving credit loans made pursuant to the Revolving Credit Facility may be used for general corporate purposes, including capital expenditures and permitted acquisitions. Revolving loans under the Revolving Credit Facility will bear interest at a floating rate, which will be (i) a base rate, (ii) Adjusted Term Secured Overnight Financing Rate ("SOFR") (defined as the forward-looking SOFR term rate published by CME Group Benchmark Administration Limited plus 0.10% per annum subject to a floor of zero) or (iii) Euro Interbank Offered Rate ("EURIBOR"), plus, in each case, an applicable margin, as determined in accordance with the provisions of the Revolving Credit Facility. The Revolving Credit Facility includes a quarterly commitment fee on the average daily unused amount of each Lender’s revolving credit commitment at a rate equal to an applicable percentage based on the Company’s first lien leverage ratio. The initial commitment fee is 0.25% per annum. Amounts under the Revolving Credit Facility may be borrowed, repaid and re-borrowed from time to time until the final maturity date on September 1, 2027. Voluntary prepayments and commitment reductions are permitted at any time without payment of any prepayment fee upon proper notice and subject to minimum dollar amounts. Certain of the Borrowers’ domestic subsidiaries (the "Guarantors") guarantee the obligations of the Borrowers under the Revolving Credit Facility. The obligations of the Borrower and the Guarantors are secured by all of the assets of the Borrowers and the Guarantors, including the Borrowers’ facility and real estate in Bessemer City, North Carolina, subject to certain exceptions and exclusions. The foregoing description of the Revolving Credit Facility does not purport to be complete and is qualified in its entirety by reference to the Amended and Restated Credit Agreement, which is filed as Exhibit 10.23 to this Annual Report on Form 10-K. We recorded $2.2 million of incremental deferred financing costs in the consolidated balance sheets for the Revolving Credit Facility commitment, arrangement and legal fees and a $0.1 million loss on debt extinguishment in the consolidated statements of operations for the twelve months ended December 31, 2022 for the write off of existing deferred financing costs to recognize a partial change in syndication related to the Revolving Credit Facility. The carrying value of our deferred financing costs was $2.3 million as of December 31, 2023 and is recorded to Other assets in our consolidated balance sheet. Covenants The Credit Agreement contains certain affirmative and negative covenants that are binding on the Borrowers and their subsidiaries, including, among others, restrictions (subject to exceptions and qualifications) on the ability of the Borrowers and their subsidiaries to create liens, to undertake fundamental changes, to incur debt, to sell or dispose of assets, to make investments, to make restricted payments such as dividends, distributions or equity repurchases, to change the nature of their businesses, to enter into transactions with affiliates and to enter into certain burdensome agreements. Furthermore, the Borrowers are subject to financial covenants regarding leverage (measured as the ratio of debt to adjusted earnings) and interest coverage (measured as the ratio of adjusted earnings to interest expense). Our financial covenants have not changed with the Credit Agreement Amendment. Our maximum allowable first lien leverage ratio is 3.5 as of December 31, 2023. Our minimum allowable interest coverage ratio is 3.5. We were in compliance with all requirements of the covenants as of December 31, 2023.

Stock-based Compensation

Stock-based Compensation	12 Months Ended
	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Stock-based Compensation	Stock-based Compensation Livent Corporation Incentive Compensation and Stock Plan As of December 31, 2023, the total shares of Livent common stock authorized for issuance under the Livent Corporation Incentive Compensation and Stock Plan (the "Livent Plan") is 10,683,837 shares. The Livent Plan provides for the grant of a variety of cash and equity awards to officers, directors, employees and consultants, including stock options, restricted stock, restricted stock units (including performance units), stock appreciation rights, and management incentive awards. The Compensation and Organization Committee of the Livent Board of Directors (the "Livent Committee") has the authority to amend the Livent Plan at any time, approve financial targets, award grants, establish performance objectives and conditions and the times and conditions for payment of awards. Stock options granted under the Livent Plan may be incentive or non-qualified stock options. The exercise price for stock options may not be less than the fair market value of the stock at the date of grant. Awards granted under the Livent Plan vest or become exercisable or payable at the time designated by the Livent Committee. The options granted in 2023 will vest on the third anniversary of the date of grant, subject generally to continued employment, and cost is recognized over the vesting period. Incentive and non-qualified options granted under the Livent Plan expire not later than 10 years from the grant date. Under the Livent Plan, awards of restricted stock units ("RSUs") vest over periods designated by the Livent Committee. The RSUs granted in 2023 to employees vest on the same schedule as the stock options granted in 2023. The RSUs granted to non-employee directors in 2023 vest at the Company's next annual meeting of stockholders following the grant date. Compensation cost is recognized over the vesting periods based on the market value of Livent common stock on the grant date of the award. Stock Compensation We recognized the following stock compensation expense for awards under the Livent Plan: Year Ended December 31, (in Millions) 2023 2022 2021 Stock Option Expense, net of taxes of $0.3, $0.3 and $0.3 $ 1.7 $ 1.8 $ 1.6 Restricted Stock Expense, net of taxes of $0.9, $0.7 and $0.6 4.5 3.6 2.9 Performance-Based Restricted Stock Expense, net of taxes of $0.3 and $0.1 1.8 0.4 — Total Stock Compensation Expense, net of taxes of $1.5, $1.1 and $0.9 (1) $ 8.0 $ 5.8 $ 4.5 ____________________ 1. Gross stock compensation charges of $8.4 million and $1.1 million were recorded to "Selling, general and administrative expenses" and "Restructuring and other charges", respectively, in our consolidated statement of operations for the year ended December 31, 2023. Gross stock compensation charges of $6.8 million and $0.1 million was recorded to "Selling, general and administrative expenses" and "Restructuring and other charges", respectively, in our consolidated statement of operations for the year ended and December 31, 2022. Gross stock compensation charges of $5.3 million was recorded to "Selling, general and administrative expenses" in our consolidated statement of operations for the year ended December 31, 2021. Stock Options The grant date fair values of the stock options granted in the year ended December 31, 2023, were estimated using the Black-Scholes option valuation model, the key assumptions for which are listed in the table below. The expected volatility assumption is based on the historical volatility of a group of fourteen of our publicly traded peers that operate in the specialty chemical sector. The expected life represents the period of time that options granted are expected to be outstanding. The risk-free interest rate is based on U.S. Treasury securities with terms equal to the expected timing of stock option exercises as of the grant date. The dividend yield assumption reflects anticipated dividends on Livent's common stock. Livent stock options granted in 2023 cliff vest on the third anniversary following the grant date and expire ten years from the date of grant. The following table contains Black Scholes valuation assumptions for stock option granted for the years ended December 31, 2023, 2022 and 2021: 2023 2022 2021 Expected dividend yield —% —% —% Expected volatility 30.2% 28.9% 27.0% Expected life (in years) 6.5 6.5 6.5 Risk-free interest rate 4.04% 1.95% 0.81% The weighted-average grant date fair value of options granted during the years ended December 31, 2023, 2022 and 2021 was $9.22 per share, $7.01 and $5.86 per share, respectively. The following table shows stock option activity, for the year ended December 31, 2023: Number of Options Granted But Not Exercised Weighted-Average Remaining Contractual Life Weighted-Average Exercise Price Per Share Aggregate Intrinsic Value (in Millions) Outstanding as of December 31, 2022 2,074,082 6.1 $ 15.16 $ 10.2 Granted 182,109 $ 23.33 Exercised (150,282) $ 10.41 $ 1.4 Forfeited (2,512) $ 22.01 Outstanding as of December 31, 2023 2,103,397 5.6 $ 16.19 $ 6.5 Exercisable as of December 31, 2023 1,206,667 4.2 $ 12.56 $ 6.5 As of December 31, 2023 and December 31, 2022, we had total remaining unrecognized compensation cost related to unvested stock options of $1.8 million and $2.1 million, which will be amortized over the weighted-average remaining requisite service period of approximately 1.7 years. The aggregate intrinsic value of stock options exercised for the year ended December 31, 2022 and 2021 was $4.9 million and $1.2 million, respectively. Restricted Stock Unit Awards The grant date fair value of RSUs under the Livent Plan is based on the market price per share of Livent's common stock on the date of grant, and the related compensation cost is amortized to expense on a straight-line basis over the vesting period during which the employees perform related services, which for the RSUs granted in 2023 is cliff vesting on the third anniversary following the grant date. The following table shows RSU activity for the year ended December 31, 2023: Restricted Stock Units Number of Weighted-Average Grant Date Fair Value Aggregate Intrinsic Value (in Millions) Nonvested as of December 31, 2022 789,115 $ 16.76 $ 15.7 Granted 245,530 $ 22.87 Vested (80,737) $ 10.45 Forfeited (3,380) $ 22.78 Nonvested as of December 31, 2023 950,528 $ 18.85 $ 17.1 The weighted-average grant date fair value of RSUs granted during the years ended December 31, 2023, 2022 and 2021 was $22.87 per share, $22.72 per share and $20.12 per share, respectively. The intrinsic value of RSUs vested during the years ended December 31, 2023, 2022, and 2021 was $1.8 million, $4.7 million, and $5.0 million, respectively. The total fair value of RSUs vested during the years ended December 31, 2023, 2022 and 2021 was $0.8 million, $2.5 million, and $3.2 million, respectively. As of December 31, 2023, there was total remaining unrecognized compensation cost related to unvested RSUs of $5.9 million which will be amortized over the weighted-average remaining requisite service period of approximately 1.7 years. Performance-Based Restricted Stock Unit ("PRSU") Awards The Company granted approximately sixty-eight thousand PRSUs ("2023 PRSUs") to key employees on February 22, 2023, as authorized under the provisions of the Livent Plan. The number of 2023 PRSUs ultimately earned will be based on Livent's Total Shareholder Return ("TSR") relative to the TSR of the companies in the Russell 3000 Chemical Supersector Index over a three year performance period from January 1, 2023 through December 31, 2025 (the "Performance Period"). The final number of 2023 PRSUs earned will range from 0% to 200% of the number of 2023 PRSUs granted based on the Company's relative TSR performance over the Performance Period. Because the value of the 2023 PRSUs is dependent upon the attainment of a level of TSR, it requires the impact of the market condition to be considered when estimating the fair value of the 2023 PRSUs. As a result, the Monte Carlo model is applied and the most significant valuation assumptions used related to the 2023 PRSUs during the year ending December 31, 2023, include: Valuation date stock price $23.33 Expected volatility 70.81% Risk free rate 4.41% The February 22, 2023 grant date fair value of each 2023 PRSU granted was $24.59 per share. Related compensation cost is amortized to expense on a straight-line basis over the vesting period during which the employees perform related services, which for the 2023 PRSUs granted in 2023 is cliff vesting on the third anniversary following the grant date. The following table shows PRSU activity for the year ended December 31, 2023: Performance-Based Restricted Stock Units Number of Weighted-Average Grant Date Fair Value Aggregate Intrinsic Value (in Millions) Nonvested as of December 31, 2022 62,846 $ 20.82 $ 1.2 Granted 68,293 $ 24.59 Vested (89,973) $ 22.83 Forfeited (888) $ 22.55 Nonvested as of December 31, 2023 40,278 $ 22.68 $ 0.7 The weighted-average grant date fair value of PRSUs granted during the year ended December 31, 2023 was $24.59 per share. Due to the Allkem Livent Merger, on December 22, 2023, 89,973 PRSUs of certain Livent executive officers vested on an accelerated basis at the higher of the PRSU payout on the accelerated vest date, which was —%, or 100%. As of December 31, 2023, there was total remaining unrecognized compensation cost related to unvested PRSUs of $0.4 million which will be amortized over the weighted-average remaining requisite service period of approximately 1.7 years.

Equity

Equity	12 Months Ended
	Dec. 31, 2023
Equity [Abstract]
Equity	Equity The following table reflects the changes in Livent's common shares issued and outstanding for each period presented: Issued Treasury Outstanding Balance as of December 31, 2021 161,791,602 (101,618) 161,689,984 RSU awards 113,565 — 113,565 Stock option awards 246,958 — 246,958 Net purchases of treasury stock - NQSP — (1,957) (1,957) Issuance of common stock 17,500,000 — 17,500,000 Balance as of December 31, 2022 179,652,125 (103,575) 179,548,550 RSU awards 134,903 — 134,903 PRSU awards 52,544 — 52,544 Stock option awards 151,979 — 151,979 Net purchases of treasury stock - NQSP — (6,013) (6,013) Issuance of common stock - conversion of 2025 Notes 114 — 114 Balance as of December 31, 2023 179,991,665 (109,588) 179,882,077 On June 6, 2022, the Company closed on the QLP Merger and issued 17,500,000 shares of its common stock, par value $0.001 per share, in a private placement as consideration to acquire the remaining 50% share of QLP previously owned by Pallinghurst and certain of its investors. See Note 6 for details. Accumulated other comprehensive loss Summarized below is the roll forward of accumulated other comprehensive loss, net of tax. (in Millions) Foreign currency adjustments Derivative Instruments (1) Total Accumulated other comprehensive loss, net of tax as of December 31, 2021 $ (43.1) $ 0.2 $ (42.9) Other comprehensive income before reclassifications (7.9) (0.9) $ (8.8) Amounts reclassified from accumulated other comprehensive loss — 0.7 0.7 Accumulated other comprehensive loss, net of tax as of December 31, 2022 $ (51.0) $ — $ (51.0) Other comprehensive loss before reclassifications 1.2 (0.5) 0.7 Amounts reclassified from accumulated other comprehensive loss — 0.5 0.5 Accumulated other comprehensive loss, net of tax as of December 31, 2023 $ (49.8) $ — $ (49.8) ______________ 1. See Note 15 for more information. Reclassifications of accumulated other comprehensive loss The table below provides details about the reclassifications from accumulated other comprehensive loss and the affected line items in the consolidated statement of operations for each of the periods presented. Details about Accumulated Other Comprehensive Loss Components Amounts Reclassified from Accumulated Other Comprehensive Loss Affected Line Item in the Consolidated Statements of Income (in Millions) Year ended December 31, 2023 Year ended December 31, 2022 Year ended December 31, 2021 Derivative instruments Foreign currency contracts $ 0.5 $ 0.9 $ (0.1) Costs of sales Total before tax 0.5 0.9 (0.1) — (0.2) — Provision for income taxes Amount included in net income $ 0.5 $ 0.7 $ (0.1) Total reclassifications for the period $ 0.5 $ 0.7 $ (0.1) Amount included in net income Dividends

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2023
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share Earnings per common share ("EPS") is computed by dividing net income by the weighted average number of common shares outstanding during the period on a basic and diluted basis. Our potentially dilutive securities include potential common shares related to our stock options, restricted stock units, performance-based restricted stock units and 2025 Notes. Diluted earnings per share ("Diluted EPS") considers the impact of potentially dilutive securities except in periods in which there is a loss because the inclusion of the potential common shares would have an anti-dilutive effect. Diluted EPS excludes the impact of potential common shares related to our stock options in periods in which the option exercise price is greater than the average market price of our common stock for the period. We use the if-converted method when calculating the potential dilutive effect of our 2025 Notes. Earnings applicable to common stock and common stock shares used in the calculation of basic and diluted earnings per share are as follows: (in Millions, Except Per Share Data) Year Ended December 31, 2023 2022 2021 Numerator: Net income $ 330.1 $ 273.5 $ 0.6 Adjustment for interest on 2025 Notes, net of tax (1) — — 0.2 Net income after assumed conversion of 2025 Notes $ 330.1 $ 273.5 $ 0.8 Denominator: Weighted average common shares outstanding - basic 179.7 171.8 154.7 Dilutive share equivalents from share-based plans 1.4 1.7 1.5 Dilutive share equivalents from 2025 Notes 28.1 28.1 28.1 Weighted average common shares outstanding - diluted 209.2 201.6 184.3 Basic earnings per common share: Net income per weighted average share - basic $ 1.84 $ 1.59 $ — Diluted earnings per common share: Net income per weighted average share - diluted $ 1.58 $ 1.36 $ — _______________________________ 1. For the years ended December 31, 2023, 2022 and 2021 $11.6 million, $11.6 million and $11.4 million of interest for the 2025 Notes was capitalized, respectively. Anti-dilutive stock options For the year ended December 31, 2023, options to purchase 155,404 shares of our common stock, at an average exercise price of $23.33 per share were anti-dilutive and not included in the computation of diluted earnings per share because the exercise price of the options was greater than the average market price of the common stock for the year ended December 31, 2023. For the years ended December 31, 2022 and 2021, none of the outstanding options to purchase shares of our common stock were anti-dilutive.

Financial Instruments, Risk Man

Financial Instruments, Risk Management and Fair Value Measurements	12 Months Ended
	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Financial Instrument, Risk Management and Fair Value Measurements	Financial Instruments, Risk Management and Fair Value Measurements Our financial instruments include cash and cash equivalents, trade receivables, other current assets, investments held in trust fund, trade payables, debt, derivatives and amounts included in accruals meeting the definition of financial instruments. Investments in the Livent NQSP deferred compensation plan trust fund are considered Level 1 investments based on readily available quoted prices in active markets for identical assets. The carrying value of cash and cash equivalents, trade receivables, other current assets, and accounts payable approximates their fair value and are considered Level 1 investments. Our other financial instruments include the following: Financial Instrument Valuation Method Foreign exchange forward contracts Estimated amounts that would be received or paid to terminate the contracts at the reporting date based on current market prices for applicable currencies. The estimated fair value of our foreign exchange forward contracts have been determined using standard pricing models which take into account the present value of expected future cash flows discounted to the balance sheet date. These standard pricing models utilize inputs derived from, or corroborated by, observable market data such as interest rate yield curves and currency and commodity spot and forward rates. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (exit price). The inputs used to measure fair value are classified into the following hierarchy: Level 1 - Unadjusted quoted prices in active markets for identical assets or liabilities. Level 2 - Unadjusted quoted prices in active markets for similar assets or liabilities, or unadjusted quoted prices for identical or similar assets or liabilities in markets that are not active, or inputs other than quoted prices that are observable for the asset or liability. Level 3 - Unobservable inputs for the asset or liability. The estimated fair value and the carrying amount of debt was $571.2 million and $299.6 million, respectively, as of December 31, 2023. Our 2025 Notes are classified as Level 2 in the fair value hierarchy. Use of Derivative Financial Instruments to Manage Risk We mitigate certain financial exposures connected to currency risk through a program of risk management that includes the use of derivative financial instruments. We enter into foreign exchange forward contracts to reduce the effects of fluctuating foreign currency exchange rates. We formally document all relationships between hedging instruments and hedged items, as well as the risk management objective and strategy for undertaking various hedge transactions. This process includes relating derivatives that are designated as fair value or cash flow hedges to specific assets and liabilities on the balance sheet or to specific firm commitments or forecasted transactions. We also assess both at the inception of the hedge and on an ongoing basis, whether each derivative is highly effective in offsetting changes in fair values or cash flows of the hedged item. If we determine that a derivative is not highly effective as a hedge, or if a derivative ceases to be a highly effective hedge, we discontinue hedge accounting with respect to that derivative prospectively. Foreign Currency Exchange Risk Management We conduct business in many foreign countries, exposing earnings, cash flows, and our financial position to foreign currency risks. The majority of these risks arise as a result of foreign currency transactions. The primary currencies for which we have exchange rate exposure are the Euro, the British pound, the Chinese yuan, the Argentine peso, and the Japanese yen. We currently do not hedge foreign currency risks associated with the Argentine peso due to the limited availability and the high cost of suitable derivative instruments. Our policy is to minimize exposure to adverse changes in currency exchange rates. This is accomplished through a controlled program of risk management that could include the use of foreign currency debt and forward foreign exchange contracts. We also use forward foreign exchange contracts to hedge firm and highly anticipated foreign currency cash flows, with an objective of balancing currency risk to provide adequate protection from significant fluctuations in the currency markets. Concentration of Credit Risk Our counterparties to derivative contracts are primarily major financial institutions. We limit the dollar amount of contracts entered into with any one financial institution and monitor counterparties’ credit ratings. We also enter into master netting agreements with each financial institution, where possible, which helps mitigate the credit risk associated with our financial instruments. While we may be exposed to credit losses due to the nonperformance of counterparties, we consider this risk remote. Accounting for Derivative Instruments and Hedging Activities Cash Flow Hedges We recognize all derivatives on the balance sheet at fair value. On the date we enter into the derivative instrument, we designate the derivative as a hedge of the variability of cash flows to be received or paid related to a forecasted transaction (cash flow hedge). We record in Accumulated Other Comprehensive Loss ("AOCL") changes in the fair value of derivatives that are designated as and meet all the required criteria for, a cash flow hedge. We then reclassify these amounts into earnings as the underlying hedged item affects earnings. In contrast we immediately record in earnings changes in the fair value of derivatives that are not designated as cash flow hedges. As of December 31, 2023, we had no open foreign currency forward contracts in AOCL designated as cash flow hedges of underlying forecasted sales and purchases. Derivatives Not Designated As Cash Flow Hedging Instruments We hold certain forward contracts that have not been designated as cash flow hedging instruments for accounting purposes. Contracts used to hedge the exposure to foreign currency fluctuations associated with certain monetary assets and liabilities are not designated as cash flow hedging instruments and changes in the fair value of these items are recorded in earnings. We had open forward contracts not designated as cash flow hedging instruments for accounting purposes with various expiration dates to buy, sell or exchange foreign currencies with a U.S. dollar equivalent of approximately $97.7 million as of December 31, 2023. Fair Value of Derivative Instruments The Company has no open derivative cash flow hedge contracts as of December 31, 2023, and open derivative cash flow contracts with a liability position of less than $0.1 million as of December 31, 2022. The following tables summarize the gains or losses related to our cash flow hedges and derivatives not designated as cash flow hedging instruments. The Company has no open derivative cash flow hedge contracts as of December 31, 2023, and open derivative cash flow contracts with a liability position of less than $0.1 million as of December 31, 2022. Derivatives in Cash Flow Hedging Relationships (in Millions) Total Foreign Exchange Contracts Accumulated other comprehensive loss, net of tax at December 31, 2021 $ 0.2 Unrealized hedging losses, net of tax (0.9) Reclassification of deferred hedging losses, net of tax (1) 0.7 Total derivative instrument impact on comprehensive income, net of tax (0.2) Accumulated other comprehensive loss, net of tax at December 31, 2022 $ — Unrealized hedging losses, net of tax (0.5) Reclassification of deferred hedging losses, net of tax (1) 0.5 Total derivative instrument impact on comprehensive loss, net of tax — Accumulated other comprehensive loss, net of tax at December 31, 2023 $ — ____________________ 1. Amounts are included in "Cost of sales" on the consolidated statement of operations. Derivatives Not Designated as Cash Flow Hedging Instruments Location of Loss Amount of Pre-tax Loss Recognized in Income on Derivatives (1) Year Ended December 31, (in Millions) 2023 2022 2021 Foreign Exchange contracts Cost of sales $ (2.8) $ (5.2) $ (2.4) Total $ (2.8) $ (5.2) $ (2.4) ____________________ 1. Amounts in the columns represent the gain or loss on the derivative instrument offset by the gain or loss on the hedged item. Fair-Value Measurements Fair-Value Hierarchy We have categorized our assets and liabilities that are recorded at fair value, based on the priority of the inputs to the valuation technique, into a three-level fair-value hierarchy. The fair-value hierarchy gives the highest priority to quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). If the inputs used to measure the assets and liabilities fall within different levels of the hierarchy, the categorization is based on the lowest level input that is significant to the fair-value measurement of the instrument. Recurring Fair Value Measurements The following tables present our fair-value hierarchy for those assets and liabilities measured at fair-value on a recurring basis in our consolidated balance sheets as of December 31, 2023 and 2022. (in Millions) December 31, 2023 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Assets Investments in deferred compensation plan (1) $ 4.1 $ 4.1 $ — $ — Total Assets (3) $ 4.1 $ 4.1 $ — $ — Liabilities Deferred compensation plan obligation (2) $ 6.7 $ 6.7 $ — $ — Total Liabilities (3) $ 6.7 $ 6.7 $ — $ — (in Millions) December 31, 2022 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Assets Investments in deferred compensation plan (1) $ 3.1 $ 3.1 $ — — Total Assets $ 3.1 $ 3.1 $ — $ — Liabilities Deferred compensation plan obligation (2) $ 5.1 $ 5.1 $ — $ — Total Liabilities (3) $ 5.1 $ 5.1 $ — $ — ____________________ 1. Balance is included in "Other assets" in the consolidated balance sheets. Livent NQSP investments in Livent common stock are recorded as "Treasury stock" in the consolidated balance sheets and carried at historical cost. A mark-to-market gain of $0.2 million and a mark-to-market gain of $0.5 million related to the Livent common stock was recorded in "Selling, general and administrative expense" in the consolidated statements of operations for the years ended December 31, 2023 and December 31, 2022, respectively, with a corresponding offset to the deferred compensation plan obligation in the consolidated balance sheets. 2. Balance is included in "Other long-term liabilities" in the consolidated balance sheets. 3.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Commitments Leases All of our leases are operating leases as of December 31, 2023. We have operating leases for corporate offices, manufacturing facilities, and land. Our leases have remaining lease terms of less than 2 years to 27 years. Disclosures about our leases under ASC 842 are summarized in the table below. Year ended December 31, (in Millions) 2023 2022 2021 Lease Cost Operating lease cost (1) $ 1.4 $ 1.3 $ 1.2 Short-term lease cost 0.4 0.4 0.9 Variable lease cost (1) — — 0.1 Total lease cost (1) $ 1.8 $ 1.7 $ 2.2 Other information Cash paid for amounts included in the measurement of lease liabilities: Cash paid for operating leases $ 1.4 $ 1.3 $ 1.8 ____________________________ 1. Lease expense is classified as "Selling, general and administrative expenses" in our consolidated statements of operations. As of December 31, 2023, our operating leases had a weighted average remaining lease term of 17.8 years and a weighted average discount rate of 6.5%. The table below presents a maturity analysis of our operating lease liabilities for each of the next five years and a total of the amounts for the remaining years. (in Millions) Undiscounted cash flows 2024 $ 1.5 2025 1.5 2026 0.7 2027 0.3 2028 0.3 Thereafter 7.3 Total future minimum lease payments 11.6 Less: Imputed interest (4.7) Total $ 6.9 Contingencies We are a party to various legal proceedings, including those noted in this section. Livent records reserves for estimated losses from contingencies when information available indicates that a loss is probable and the amount of the loss, or range of loss, can be reasonably estimated. As additional information becomes available, management adjusts its assessments and estimates. Legal costs are expensed as incurred. In addition to the legal proceedings noted below, we have certain contingent liabilities arising in the ordinary course of business. Some of these contingencies are known but are so preliminary that the merits cannot be determined, or if more advanced, are not deemed material based on current knowledge; and some are unknown - for example, claims with respect to which we have no notice or claims which may arise in the future from products sold, guarantees or warranties made, or indemnities provided. Therefore, we are unable to develop a reasonable estimate of our potential exposure of loss for these contingencies, either individually or in the aggregate, at this time. There can be no assurance that the outcome of these contingencies will be favorable, and adverse results in certain of these contingencies could have a material adverse effect on the consolidated financial position, results of operations in any one reporting period, or liquidity. Argentine Customs & Tax Authority Matters Minera del Altiplano SA, our subsidiary in Argentina ("MdA"), has received notices from the Argentine Customs Authorities that they are conducting customs audits in Salta (for 2016 to 2019, 2021 and 2022), Rosario (for 2016 and 2017), Buenos Aires and Ezeiza (for 2018, 2019, 2021 and 2022) regarding the export of Lithium Carbonate by MdA from each of those locations. MdA was also notified by the Argentine Tax Authority of the start of transfer pricing audits for the periods 2017 and 2018. During a part of this period, MdA was a subsidiary of FMC. However, the Company agreed to bear any possible liability for these types of matters under the terms of the Tax Matters Agreement that it entered into with FMC in connection with the Separation. A range of reasonably possible liabilities, if any, cannot be currently estimated by the Company. In January, 2023, the Argentina Ministry of Economy issued a resolution to cancel an export rebate regime relating to lithium products, which was followed by Presidential Decree No. 57/2023 in February, 2023. The Presidential Decree prospectively cancels all export rebates for lithium products. Prior to the Presidential Decree, MdA had the right to collect 4% of the FOB value for the exported products (which consisted of the "La Puna" rebate which was 2.5% and the "Export" rebate which was 1.5%). In October 2023 by Presidential Decree No. 557/2023 the Export rebate of 1.5% was reinstated. Subsequent to the Presidential Decree entering into force on October 26, 2023 MdA is entitled to the 1.5% rebate/refund on FOB value of its exported products. As of December 31, 2023, MdA has a receivable of approximately $3.9 million USD which is still valid and remains in force after the Presidential Decrees. SDJ is under transfer pricing and customs audits by the Argentine Tax Authority and Argentine Customs Authority for the periods 2017 and 2018.

Supplemental Information

Supplemental Information	12 Months Ended
	Dec. 31, 2023
Balance Sheet Related Disclosures [Abstract]
Supplemental Information	Supplemental Information The following tables present details of prepaid and other current assets, other assets, accrued and other liabilities and other long-term liabilities as presented on the consolidated balance sheets: (in Millions) December 31, 2023 2022 Prepaid and other current assets Income tax receivable - refunds and prepayments $ 29.5 $ 22.0 Argentina government receivable (1) 7.9 6.7 Prepaid expenses 16.9 11.6 Other receivables 28.2 7.4 Bank Acceptance Drafts (2) — 6.9 Other current assets 3.9 6.5 Total $ 86.4 $ 61.1 (in Millions) December 31, 2023 2022 Other assets Argentina government receivable (1)(3) $ 71.3 $ 80.3 Advance to contract manufacturers (4) 27.6 17.2 Long-term raw materials inventory 1.0 1.6 Capitalized software, net 1.1 1.4 Other income tax related items 4.0 3.7 Other long-term assets 22.7 12.2 Total $ 127.7 $ 116.4 ____________________ 1. We have various subsidiaries that conduct business within Argentina. At December 31, 2023 and 2022, $38.8 million and $40.0 million of outstanding receivables due from the Argentina government, which primarily represent export tax and export rebate receivables, were denominated in U.S. dollars. A recent judicial decision relating to the U.S. dollar-denominated export tax receivable portion ($34.8 million) permits the Argentina government to reimburse us in Argentine pesos at the historical foreign exchange rate applicable at each past payment date, adjusted by a bank deposit interest rate. While Livent filed an appeal on November 6, 2023 and believes it has valid defenses on the technical merits, the ultimate resolution of this matter could result in a possible loss of up to $33.8 million. We continually review the recoverability of all outstanding receivables by analyzing historical experience, current collection trends and regional business and political factors among other factors. 2. Bank Acceptance Drafts are a common Chinese finance note used to settle trade transactions. Livent accepts these notes from Chinese customers based on criteria intended to ensure collectability and limit working capital usage. 3. In June 2023, the Company decided to pay $21.7 million for the export duties and interest claimed by the Customs Authorities of Buenos Aires, Ezeiza and Salta related to exports made between the years 2018 – 2022 registered in those locations. This payment stops the accrual of any further interest. It was a deposit made under protest, and was not an admission of any of the claims made by the Customs Authorities or a waiver of any of the Company's defenses, including recovery of the deposit plus interest. The cases remain in discussion. See Note 16 for more information. 4. We record deferred charges related to certain contract manufacturing agreements which we amortize over the term of the underlying contract. (in Millions) December 31, 2023 2022 Accrued and other current liabilities Accrued payroll $ 31.2 $ 19.8 Accrued investment in unconsolidated affiliate 27.0 0.1 Restructuring reserves 1.7 3.1 Retirement liability - 401K 3.2 2.6 Environmental reserves, current 0.5 0.6 Severance — 0.1 Other accrued and other current liabilities 73.2 11.1 Total $ 136.8 $ 37.4 (in Millions) December 31, 2023 2022 Other long-term liabilities Deferred compensation plan obligation $ 6.7 $ 5.1 Contingencies related to uncertain tax positions (1) 6.2 5.7 Self insurance reserves 1.1 1.5 Asset retirement obligations 3.7 0.2 Other long-term liabilities 3.6 3.4 Total $ 21.3 $ 15.9 ____________________ 1. As of December 31, 2023, we have recorded a liability for uncertain tax positions of $5.8 million and a $0.4 million indemnification liability to FMC for assets where the offsetting uncertain tax position is with FMC.

Subsequent Event

Subsequent Event	12 Months Ended
	Dec. 31, 2023
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event On January 4, 2024, Arcadium Lithium completed the previously announced Allkem Livent Merger by and among Livent Corporation, a Delaware corporation ("Livent"), Allkem Limited, an Australian public company limited by shares ("Allkem"), Arcadium Lithium plc, a public limited company incorporated under the laws of the Bailiwick of Jersey ("Arcadium Lithium"), Lightning-A Merger Sub, Inc., a Delaware corporation ("Merger Sub"), and Arcadium Lithium Intermediate IRL Limited, a private company limited by shares and incorporated and registered in Ireland ("Irish IntermediateCo"). The transaction was consummated by way of (a) a scheme of arrangement under Australian law (the “scheme”), pursuant to which each issued, fully paid ordinary share of Allkem held by Allkem shareholders was exchanged for (i) where the Allkem shareholder did not elect to receive ordinary shares, par value $1.00 per share, of Arcadium Lithium (each, an "Arcadium Lithium Share"), one Arcadium Lithium CHESS Depositary Instrument (a "CDI") quoted on the Australian Stock Exchange, each CDI representing a beneficial ownership interest in one Arcadium Lithium Share and (ii) where the Allkem shareholder elected to receive Arcadium Lithium Shares, one Arcadium Lithium Share, with Allkem becoming a wholly owned subsidiary of Arcadium Lithium and (b) a merger, whereby Merger Sub, a wholly owned subsidiary of Irish IntermediateCo (a direct wholly owned subsidiary of Arcadium Lithium) merged with and into Livent, with Livent surviving the Allkem Livent Merger as an indirect wholly owned subsidiary of Arcadium Lithium, and pursuant to which each share of Livent common stock, par value $0.001 per share (each, a "Livent Share"), was converted into the right to receive 2.406 Arcadium Lithium Shares, and such Arcadium Lithium Shares were issued at the effective time of the Allkem Livent Merger. Pursuant to the Allkem Livent Merger, 433,156,855 Arcadium Lithium Shares were issued to former Livent stockholders and 641,337,840 Arcadium Lithium Shares (comprising 98,725,616 Arcadium Lithium Shares and 542,612,224 CDIs in respect of Arcadium Lithium Shares) were issued to former Allkem shareholders. The total purchase consideration for the Allkem Livent Merger was approximately $4.4 billion which represents the sum of the (i) estimated fair value of the 641,337,840 Arcadium Shares issued to Allkem shareholders and (ii) the portion of the fair value of accelerated Allkem performance rights attributable to pre-combination service. The following table summarizes the fair value of the consideration associated with the Allkem Livent Merger: (in millions) Amount Fair value of Arcadium Shares issued to Allkem shareholders $ 4,385.6 Fair value of converted Allkem performance rights attributable to pre-combination service 4.8 Preliminary estimated aggregate purchase consideration $ 4,390.4 The Allkem Livent Merger meets the criteria to be accounted for as a business combination and will be accounted for using the acquisition method of accounting, with Livent being treated as the accounting acquirer. Under the acquisition method of accounting, the assets and liabilities of Allkem and its subsidiaries will be recorded at their respective fair values as of the date of completion of the Allkem Livent Merger and added to Livent’s and the difference between the fair value of the consideration paid for the acquired entity and fair value of the net assets acquired will be recorded as goodwill. We have not yet completed the purchase accounting for the Allkem Livent Merger, including determining the preliminary fair value of the assets acquired and liabilities assumed. The preliminary purchase price allocation is expected to be completed in the first quarter of fiscal year 2024 and is subject to change for up to one year subsequent to the closing date of the Allkem Livent Merger. Determining the fair value of the assets and liabilities of Allkem requires judgment and certain assumptions to be made, the most significant of these being related to the valuation of Allkem's mining properties and rights. Unaudited Pro Forma Financial Information

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pay vs Performance Disclosure
Net income	$ 330.1	$ 273.5	$ 0.6

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Dec. 31, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Principal Accounting Policies_2

Principal Accounting Policies and Related Financial Information (Policies)	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Basis of presentation and principles of consolidation	Basis of presentation and principles of consolidation . In this Annual Report on Form 10-K, because Arcadium Lithium plc is the successor company to Livent in the Allkem Livent Merger which closed on January 4, 2024, we are presenting the results of Livent’s operations for the years ended December 31, 2023, 2022 and 2021 and as of December 31, 2023. The financial statements of the Company presented in this Annual Report on Form 10-K do not include the financial position or operations of Allkem since the Allkem Livent Merger occurred subsequent to the end of the reporting period. Refer to Note 18 for further information related to the Allkem Livent Merger. The accompanying consolidated financial statements are presented on a consolidated basis and include all of the accounts and operations of Livent and its majority-owned subsidiaries. For entities that we control, but own less than 100%, we record the minority ownership as noncontrolling interest. The financial statements reflect the financial position, results of operations and cash flows of Arcadium Lithium in accordance with U.S. GAAP. All significant intercompany accounts and transactions are eliminated in consolidation.
Earnings per share	Earnings per share . The weighted average common shares outstanding for both basic and diluted earnings per share for all periods presented was calculated, in accordance with ASC 260, Earnings Per Share.
Estimates and assumptions	Estimates and assumptions . In preparing the financial statements in conformity with U.S. GAAP we are required to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ materially from these estimates under different assumptions or conditions, but we do not believe such differences will materially affect our financial position, results of operations or cash flows.
Cash equivalents	Cash equivalents . We consider investments in all liquid debt instruments with original maturities of three months or less to be cash equivalents.
Trade receivables, net of allowance and other receivables	Trade receivables, net of allowance and other receivables . Trade receivables consist of amounts owed to us from customer sales and are recorded when revenue is recognized. The allowance for trade receivables represents our best estimate of the probable losses associated with potential customer defaults. In developing our allowance for trade receivables, we use a two stage process which includes calculating a formula to develop an allowance to appropriately address the uncertainty surrounding collection risk of our entire portfolio and specific allowances for customers where the risk of collection has been reasonably identified either due to liquidity constraints or disputes over contractual terms and conditions.
Inventories	Inventories . Inventories are stated at the lower of cost or net realizable value. Inventory costs include those costs directly attributable to products before sale, including all manufacturing overhead but excluding distribution costs. All inventories are determined on a first-in, first-out ("FIFO") basis.
Property, plant and equipment	Property, plant and equipment
Capitalized interest	Capitalized interest . For the years ended December 31, 2023, 2022 and 2021 we capitalized interest expense of $16.8 million , $15.8 million and $15.4 million, respectively. These costs were associated with the construction of certain long-lived assets and have been capitalized as part of the cost of those assets. We amortize capitalized interest over the estimated useful lives of the assets.
Impairments of long-lived assets	Impairments of long-lived assets . We review the recoverability of the net book value of long-lived assets whenever events and circumstances indicate ("triggering events") that the net book value of an asset may not be recoverable from the estimated undiscounted future cash flows expected to result from its use and eventual disposition. In cases where a triggering event occurs and undiscounted expected future cash flows are less than the net book value, we recognize an impairment loss equal to an amount by which the net book value exceeds the fair value of the asset. Long-lived assets to be disposed of are reported at the lower of carrying amount or fair value less cost to sell. There were no significant impairments during the three years ended December 31, 2023.
Asset retirement obligations	Asset retirement obligations . We record asset retirement obligations ("AROs") at present value at the time the liability is incurred if we can reasonably estimate the settlement date. The associated AROs are capitalized as part of the carrying amount of related long-lived assets. In future periods, the liability is accreted to its estimated fair value and the capitalized cost is depreciated over the useful life of the related asset. We also adjust the liability for changes resulting from the passage of time and/or revisions to the timing or the amount of the original estimate. Upon retirement of the long-lived asset, we either settle the obligation for its recorded amount or incur a gain or loss. We have mining operations and legal reclamation obligations related to our facilities upon closure of the mines. The AROs primarily relate to post-closure reclamation of brine wells and sites involved in the surface mining and manufacturing of lithium in Argentina. Also, we have obligations at certain of our manufacturing facilities and offices in the event of permanent plant shutdown. The carrying amounts for the AROs for the years ended December 31, 2023 and 2022 are $3.7 million and $0.2 million, respectively. These amounts are included in "Other long-term liabilities" on the consolidated balance sheets.
Deferred compensation plan	Deferred compensation plan .
4.125% Convertible Senior Notes due 2025 (the "2025 Notes")	4.125% Convertible Senior Notes due 2025 (the "2025 Notes") . We account for our 2025 Notes under Accounting Standards Update ("ASU") No. 2020-06, Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity's Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity's Own Equity ("ASU 2020-06").
Financial instruments	Financial instruments . Our financial instruments include cash and cash equivalents, trade receivables, other current assets, investments held in trust fund, trade payables, debt, derivatives and amounts included in accruals meeting the definition of financial instruments. Trade receivables and trade payables are recorded at carrying value, which approximates fair value due to the short-term nature of the instruments. Investments held in trust are for the Livent NQSP as discussed in "Deferred compensation plan" subsection above. Livent enters into derivative contracts to hedge exposures and the associated assets or liabilities are recorded in our consolidated balance sheets and the gains or losses associated with these transactions are included in the consolidated statements of operations.
Equity method investments	Equity method investments
Leases	Leases. The Company determines if an arrangement is a lease at the inception of the contract. Our operating leases are included in Operating lease right-of-use ("ROU") assets, Operating lease liabilities - current, and Operating lease liabilities - long term in the consolidated balance sheets. The operating lease ROU assets and operating lease liabilities are recognized based on the present value of future minimum lease payments over the lease term at commencement date. As most of our leases do not provide an implicit interest rate, we utilize an estimated incremental borrowing rate based on the information available at commencement date in determining the present value of future payments. In determining the discount rate used in the present value calculation, the Company has elected to apply the portfolio approach for leases provided the leases commenced at or around the same time. This election allows the Company to account for leases at a portfolio level provided that the resulting accounting at this level would not differ materially from the accounting at the individual lease level. Lease expense for minimum lease payments is recognized on a straight-line basis over the lease term. The Company has elected not to separate lease and non-lease components and accounts for each separate lease component and non-lease component associated with that lease component as a single lease component. Operating lease ROU assets include all contractual lease payments and initial direct costs incurred less any lease incentives. Facility leases generally only contain lease expense and non-component items such as taxes and pass through charges. Additionally, we have elected not to apply the recognition requirements of ASC 842 to leases which have a lease term of less than one year at the commencement date.
Restructuring and other charges	Restructuring and other charges . We continually perform strategic reviews and assess the return on our businesses. This sometimes results in a plan to restructure the operations of our business. We record an accrual for severance and other exit costs under the provisions of the relevant accounting guidance. Additionally, as part of these restructuring plans, write-downs of long-lived assets may occur. Two types of assets are impacted: assets to be disposed of by sale and assets to be abandoned. Assets to be disposed of by sale are measured at the lower of carrying amount or estimated net proceeds from the sale. Assets to be abandoned with no remaining future service potential are written down to amounts expected to be recovered. The useful life of assets to be abandoned that have a remaining future service potential are adjusted and depreciation is recorded over the adjusted useful life. Restructuring and other charges also includes transaction costs related to the Allkem Livent Merger.
Finite-lived intangible assets and Goodwill	Finite-lived intangible assets . Finite-lived intangible assets consist of patents, which are amortized over a period of approximately 15 years. We evaluate the recovery of our finite-lived intangible assets by comparing the net carrying value of the asset group to the undiscounted net cash flows expected to be generated from the use and eventual disposition of that asset group when events or changes in circumstances indicate that its carrying amount may not be recoverable. If the carrying amount of the asset group is not recoverable, the fair value of the asset group is measured and if the carrying amount exceeds the fair value, an impairment loss is recognized. Goodwill . We account for goodwill and other intangibles acquired in a business combination in conformity with current accounting guidance, which requires goodwill and indefinite-lived intangible assets to not be amortized. On October 18, 2023, the Company consolidated Nemaska Lithium and recorded goodwill of $120.7 million primarily related to potential synergies arising from the proximity of Nemaska Lithium to other resources in the region. Nemaska Lithium was previously accounted for under the equity method of accounting, see Note 6 for details. The Company has elected a policy to perform its annual goodwill impairment test in the fourth quarter of each year as of October 31 and will perform its first annual goodwill impairment testing on October 31, 2024 or upon the occurrence of events or changes in circumstances that would more likely than not reduce the fair value of its reporting units below their carrying amounts.
Revenue recognition	Revenue recognition Our lithium products are developed and sold to global and regional customers in the EV, electronics, agrochemicals, pharmaceuticals, polymer and specialty alloy metals market among others. Lithium hydroxide products are used in advanced batteries for all-electric vehicles as well as other products that require portable energy storage such as power tools and military devices. Lithium hydroxide is also sold into grease applications for use in automobiles, aircraft, railcars, agricultural and other types of equipment. Butyllithium products are primarily used as polymer initiators, and in the synthesis of agrochemicals and pharmaceuticals. High purity lithium metal and other specialty compounds include lithium phosphate, pharmaceutical-grade lithium carbonate, high purity lithium chloride and specialty organics. Additionally, we sell whatever lithium carbonate and lithium chloride we do not use internally to our customers for various applications. Sale of Goods Revenue from product sales is recognized when we satisfy a performance obligation by transferring the promised goods to a customer, that is, when control of the good transfers to the customer. The customer is then invoiced at the agreed-upon price with payment terms generally ranging from 30 to 180 days. In determining when the control of goods is transferred, we typically assess, among other things, the transfer of title and risk of loss and the shipping terms of the contract. We record amounts billed for shipping and handling fees as revenue. Costs incurred for shipping and handling are recorded in cost of sales. When we perform shipping and handling activities after the transfer of control to the customer (e.g., when control transfers prior to delivery), they are considered fulfillment activities, and accordingly, the costs are accrued to cost of sales when the related revenue is recognized. Amounts billed for sales and use taxes, VAT, and certain excise and other specific transactional taxes imposed on revenue-producing transactions are presented on a net basis and excluded from revenue in the consolidated statements of operations. We record a liability until remitted to the respective taxing authority. Right of Return We warrant to our customers that our products conform to mutually agreed product specifications. We accrue for expected returns as they occur. Contract asset and contract liability balances We satisfy our obligations by transferring goods and services in exchange for consideration from customers. The timing of performance sometimes differs from the timing the associated consideration is received from the customer, thus resulting in the recognition of a contract liability. We recognize a contract liability if the customer’s payment of consideration is received prior to completion of our related performance obligation.
Research and Development	Research and Development . Research and development costs are expensed as incurred.
Income and other taxes	Income and other taxes . We provide current income taxes on income reported for financial statement purposes adjusted for transactions that do not enter into the computation of income taxes payable and recognize deferred tax liabilities and assets for the expected future tax consequences of temporary differences between the carrying amounts and the tax basis of assets and liabilities. Prior to the Separation, pursuant to the tax matters agreement with FMC, in jurisdictions where we file consolidated returns with FMC, we have recorded our allocated share of the consolidated liability as part of the income tax payable in our consolidated balance sheets. In taxing jurisdictions where we file as a standalone entity we have recorded the tax liability/benefit to income tax payable/receivable. We do not provide income taxes on the equity in undistributed earnings of consolidated foreign subsidiaries as it is our intention that such earnings will remain invested in those companies.
Segment information	Segment information.
Stock-based compensation	Stock-based compensation
Environmental obligations	Environmental obligations . We provide for environmental-related obligations when they are probable and amounts can be reasonably estimated. Included in our environmental liabilities are costs for the operation, maintenance and monitoring of site remediation plans ("OM&M"). Such reserves are based on our best estimates for these OM&M plans. Over time we may incur OM&M costs in excess of these reserves which could be significant.
Foreign currency	Foreign currency
New Accounting guidance and regulatory items	New Accounting guidance and regulatory items In December 2023, the Financial Accounting Standard Board ("FASB") issued ASU No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures . This ASU enhances existing income tax disclosures to better assess how an entity's operation and related tax risks, tax planning, and operational opportunities affect its tax rate and prospects for future cash flows. The ASU is effective for annual periods beginning after December 15, 2024. We are currently evaluating the effect the guidance will have on our consolidated financial statements. In November 2023, the FASB issued ASU No. 2023-07, Segment Reporting (Topic 280)
Derivatives	Use of Derivative Financial Instruments to Manage Risk We mitigate certain financial exposures connected to currency risk through a program of risk management that includes the use of derivative financial instruments. We enter into foreign exchange forward contracts to reduce the effects of fluctuating foreign currency exchange rates. We formally document all relationships between hedging instruments and hedged items, as well as the risk management objective and strategy for undertaking various hedge transactions. This process includes relating derivatives that are designated as fair value or cash flow hedges to specific assets and liabilities on the balance sheet or to specific firm commitments or forecasted transactions. We also assess both at the inception of the hedge and on an ongoing basis, whether each derivative is highly effective in offsetting changes in fair values or cash flows of the hedged item. If we determine that a derivative is not highly effective as a hedge, or if a derivative ceases to be a highly effective hedge, we discontinue hedge accounting with respect to that derivative prospectively. Foreign Currency Exchange Risk Management We conduct business in many foreign countries, exposing earnings, cash flows, and our financial position to foreign currency risks. The majority of these risks arise as a result of foreign currency transactions. The primary currencies for which we have exchange rate exposure are the Euro, the British pound, the Chinese yuan, the Argentine peso, and the Japanese yen. We currently do not hedge foreign currency risks associated with the Argentine peso due to the limited availability and the high cost of suitable derivative instruments. Our policy is to minimize exposure to adverse changes in currency exchange rates. This is accomplished through a controlled program of risk management that could include the use of foreign currency debt and forward foreign exchange contracts. We also use forward foreign exchange contracts to hedge firm and highly anticipated foreign currency cash flows, with an objective of balancing currency risk to provide adequate protection from significant fluctuations in the currency markets. Concentration of Credit Risk Our counterparties to derivative contracts are primarily major financial institutions. We limit the dollar amount of contracts entered into with any one financial institution and monitor counterparties’ credit ratings. We also enter into master netting agreements with each financial institution, where possible, which helps mitigate the credit risk associated with our financial instruments. While we may be exposed to credit losses due to the nonperformance of counterparties, we consider this risk remote. Accounting for Derivative Instruments and Hedging Activities Cash Flow Hedges

Principal Accounting Policies_3

Principal Accounting Policies and Related Financial Information (Tables)	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Schedule of Property, Plant and Equipment	The major classifications of property, equipment and software, including their respective expected useful lives, consisted of the following: Asset type Useful Life Land — Land improvements 20 years Buildings 20-40 years Mining rights 33 years Machinery and Equipment 3-18 years Software 3-10 years Property, plant and equipment consisted of the following: December 31, (in Millions) 2023 2022 Land and land improvements $ 106.2 $ 87.0 Buildings 134.9 85.8 Machinery and equipment 420.7 333.4 Mineral rights (1) 560.0 — Construction in progress 1,284.4 715.2 Total cost $ 2,506.2 $ 1,221.4 Accumulated depreciation (269.1) (253.1) Property, plant and equipment, net $ 2,237.1 $ 968.3 _______________ 1. On October 18, 2023 we began consolidating Nemaska Lithium, see Note 6 for details.

Revenue Recognition (Tables)

Revenue Recognition (Tables)	12 Months Ended
	Dec. 31, 2023
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following table provides information about disaggregated revenue by major geographical region: Year Ended December 31, (in Millions) 2023 2022 2021 Asia Pacific (1) $ 649.7 $ 566.5 $ 296.8 North America (1) 143.8 145.7 61.4 Europe, Middle East & Africa 87.2 98.1 62.2 Latin America 1.8 2.9 — Total Revenue $ 882.5 $ 813.2 $ 420.4 ____________________ 1. In 2023, countries with sales in excess of 10% of combined revenue consisted of China, the U.S., Japan and South Korea. Sales for the year ended December 31, 2023 for China, the U.S., Japan and South Korea totaled $364.8 million, $138.7 million, $136.9 million, and $123.0 million, respectively. In 2022, countries with sales in excess of 10% of combined revenue consisted of China, Japan, and the U.S. S ales for the year ended December 31, 2022 for China, Japan, and the U.S. totaled $304.9 million, $167.6 million, and $139.1 million, respectively. In 2021, countries with sales in excess of 10% of combined revenue consisted of China, Japan, the U.S. and South Korea. Sales for the year ended December 31, 2021 for China, Japan, the U.S. and South Korea totaled $160.0 million, $75.1 million, $59.9 million and $43.6 million, respectively. The following table provides information about disaggregated revenue by major product category: Year Ended December 31, (in Millions) 2023 2022 2021 Lithium Hydroxide $ 564.4 $ 415.5 $ 208.0 Butyllithium 227.6 277.7 105.4 High Purity Lithium Metal and Other Specialty Compounds 44.9 50.9 36.9 Lithium Carbonate and Lithium Chloride 45.6 69.1 70.1 Total Revenue $ 882.5 $ 813.2 $ 420.4
Receivables and Contract Liabilities	The following table presents the opening and closing balances of our contract liabilities and current trade receivables (including buy/sell arrangements), net of allowances from contracts with customers. Balance as of (in Millions) December 31, 2023 December 31, 2022 (Decrease)/increase Receivables from contracts with customers, net of allowances $ 106.7 $ 141.6 $ (34.9) Contract liability - short-term 4.4 15.5 (11.1) Contract liability - long-term 217.8 198.0 19.8

Inventories, Net (Tables)

Inventories, Net (Tables)	12 Months Ended
	Dec. 31, 2023
Inventory Disclosure [Abstract]
Schedule of Inventories	Inventories consisted of the following: December 31, (in Millions) 2023 2022 Finished goods $ 59.1 $ 44.6 Semi-finished goods 108.8 57.1 Raw materials, supplies, and other 49.6 50.6 FIFO inventory, net $ 217.5 $ 152.3

Investments (Tables)

Investments (Tables)	12 Months Ended
	Dec. 31, 2023
Equity Method Investments and Joint Ventures [Abstract]
Schedule of Equity Method Investment, Summarized Financial Information	The table below represents Nemaska Lithium's balance sheet at fair value consolidated by the Company as of October 18, 2023: Nemaska Lithium Inc. October 18, (in Millions) Note 2023 (a) ASSETS Cash and cash equivalents $ 133.5 Sales tax receivable 9.2 Prepaid expenses 3.4 Total current assets 146.1 In-trust deposits b 9.9 Property, plant and equipment c 925.2 Goodwill d 120.7 Intangible assets e 52.0 Other non-current assets 0.5 Total non-current assets 1,108.3 Total assets $ 1,254.4 LIABILITIES AND EQUITY Current portion of long-term debt f $ 2.4 Accounts payable and accrued liabilities 59.8 Total current liabilities 62.2 Long-term debt g 56.1 Contract liability - long-term g 19.8 Asset retirement obligations h 3.4 Deferred income taxes 113.4 Other non-current liabilities 0.3 Total non-current liabilities 193.0 Total current and long-term liabilities 255.2 Livent stockholders’ equity 499.6 Noncontrolling interest 499.6 Total equity 999.2 Total liabilities and equity $ 1,254.4 a. Represents the Nemaska Lithium balance sheet as of the October 18, 2023 consolidation date. b. Represents a deposit held in trust for estimated restoration costs relating to the Whabouchi site asset retirement obligation. c. Primarily represents mining property, mining rights and construction in progress for the Whabouchi and Bécancour sites related to project engineering, equipment and site preparation and capitalized financing costs. d. Primarily related to potential synergies arising from the proximity of Nemaska Lithium to other resources in the region. e. Primarily represents intellectual property in relation to patents and development costs with a weighted average amortization period of 15 years. f. Represents current portion of the unsecured obligation governing the working relationship between the Nemaska Lithium Project and the Cree Nation of Nemaska. g. Primarily represents $75.0 million for the prepayment received for a customer supply agreement entered on October 18, 2023, recorded net of imputed discount of $19.8 million. h. Represents the asset retirement obligation for estimated inflation-adjusted and discounted future costs associated with mine reclamation and closure activities at the Whabouchi site, and assuming that the disbursements would be made in 2056. The following summarized financial data for Nemaska Lithium present, on a one-quarter lag basis, the assets, liabilities, equity, results of operations and cash flows for Nemaska Lithium for periods in which it was a significant unconsolidated affiliate: Nemaska Lithium Inc. December 31, (in Millions) Note 2022 (a) 2021 (a) ASSETS Cash and cash equivalents $ 5.9 $ 10.3 Sales tax receivable 2.5 0.4 Prepaid expenses 0.6 0.6 Other current assets 0.1 — Assets held for sale 1.0 1.1 Total current assets 10.1 12.4 In-trust deposits b 8.9 7.3 Property, plant and equipment, net of accumulated depreciation of $0.7 in 2022 and $0.6 in 2021 c 166.6 176.3 Intangible assets d 29.5 31.9 Total non-current assets 205.0 215.5 Total assets $ 215.1 $ 227.9 LIABILITIES AND EQUITY Current portion of long-term debt e $ 35.7 $ 2.7 Accounts payable and accrued liabilities 4.1 2.1 Current portion of financial liability f 0.5 9.5 Total current liabilities 40.3 14.3 Long-term debt g — 30.5 Non-current portion of unsecured obligation h 2.3 5.1 Asset retirement obligations i 6.9 6.4 Other non-current liabilities 0.4 — Total non-current liabilities 9.6 42.0 Total current and long-term liabilities 49.9 56.3 Share capital j 115.0 71.6 Contributed surplus 24.0 25.8 Retained earnings 26.2 74.2 Total equity 165.2 171.6 Total liabilities and equity $ 215.1 $ 227.9 ________________________ a. Represents September 30, 2022 and September 30, 2021, respectively, for Nemaska Lithium on a one-quarter lag basis, as allowed under ASC 323. b. Represents a deposit held in trust for estimated restoration costs relating to the Whabouchi site asset retirement obligation (note i). c. Primarily represents construction in progress for the Whabouchi site related to project engineering, equipment and site preparation and capitalized financing costs. d. Primarily represents intellectual property in relation to patents and development costs. e. Includes $33.2 million representing current portion of the Orion promissory note and $2.5 million related to the unsecured obligation governing the working relationship between the Nemaska Lithium Project and the Cree Nation of Nemaska (see Note h). f. Includes a bankruptcy restructuring obligation due to a supplier that was paid in the first quarter of 2022. g. Represents a promissory note to Orion. The Orion note bears interest at 8%, matured November 26, 2022, and was secured by Nemaska Lithium's tangible and intangible assets. h. Represents an unsecured obligation governing the working relationship between the Nemaska Lithium Project and the Cree Nation of Nemaska. The obligation bears interest at 4.75% per annum, matures in September 2024, and is repaid in quarterly installments. i. Represents the asset retirement obligation for estimated inflation-adjusted and discounted future costs associated with mine reclamation and closure activities at the Whabouchi site, and assuming that the disbursements would be made in 2056. j. For the twelve months ended September 30, 2022 and the ten months ended September 30, 2021, Nemaska Lithium issued 20 million and 60 million shares, respectively, for cash proceeds of $50.6 million and $70.2 million, respectively. An unlimited number of shares are authorized without par value. Nemaska Lithium Inc. (in Millions) Year Ended December 31, Note 2023 (a) 2022 (a) 2021 (a) Summary of Statement of Operations Information: Operating costs b $ 30.7 $ 25.7 $ 11.5 General and administrative costs c 16.7 14.2 8.0 Other (income)/costs d (1.3) 4.3 2.5 Net loss from operations before income taxes (46.1) (44.2) (22.0) Income tax benefit — — (0.2) Net loss $ (46.1) $ (44.2) $ (21.8) _________________________ a. Represents the nine months and 17 days ended July 17, 2023, the twelve months ended September 30, 2022 and the ten months ended September 30, 2021 (our initial investment was made on December 1, 2020), respectively, for Nemaska Lithium on a one-quarter lag basis, as allowed under ASC 323, all prior to consolidation of Nemaska Lithium on October 18, 2023. b. Primarily includes construction management and engineering consulting fees. c. Primarily includes employee compensation, rent, office and other expenses and professional fees. d. Primarily includes finance (income)/costs and foreign exchange gains and losses. Nemaska Lithium Inc. (in Millions) Year Ended December 31, Note 2022 (a) 2021 (a) Cash used in operating activities $ (41.6) $ (15.0) Cash used in investing activities: Additions to property, plant and equipment (1.4) — Purchases of intangible assets (0.1) — Proceeds from sale of assets — 0.3 Increase in deposit to suppliers — (0.8) Cash used in investing activities $ (1.5) $ (0.5) Cash provided by financing activities: Proceeds from issuance of shares b 50.6 70.2 Debt repayment (8.8) (50.0) Payment of unsecured obligation (2.6) (2.7) Cash provided by financing activities $ 39.2 $ 17.5 Effect of exchange rate changes on cash and cash equivalents (0.5) 0.6 (Decrease)/increase in cash and cash equivalents (4.4) 2.6 Cash and cash equivalents, beginning of period 10.3 7.7 Cash and cash equivalents, end of period $ 5.9 $ 10.3 _________________________ a. Represents the twelve months ended September 30, 2022 and the ten months ended September 30, 2021, respectively, for Nemaska Lithium on a one-quarter lag basis, as allowed under ASC 323. b.

Property, Plant and Equipment_2

Property, Plant and Equipment, Net (Tables)	12 Months Ended
	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
Schedule of Property, Plant and Equipment	The major classifications of property, equipment and software, including their respective expected useful lives, consisted of the following: Asset type Useful Life Land — Land improvements 20 years Buildings 20-40 years Mining rights 33 years Machinery and Equipment 3-18 years Software 3-10 years Property, plant and equipment consisted of the following: December 31, (in Millions) 2023 2022 Land and land improvements $ 106.2 $ 87.0 Buildings 134.9 85.8 Machinery and equipment 420.7 333.4 Mineral rights (1) 560.0 — Construction in progress 1,284.4 715.2 Total cost $ 2,506.2 $ 1,221.4 Accumulated depreciation (269.1) (253.1) Property, plant and equipment, net $ 2,237.1 $ 968.3 _______________ 1. On October 18, 2023 we began consolidating Nemaska Lithium, see Note 6 for details.

Restructuring and Other Charg_2

Restructuring and Other Charges (Tables)	12 Months Ended
	Dec. 31, 2023
Restructuring and Related Activities [Abstract]
Schedule of Restructuring Charges and Asset Disposals	The following table shows total restructuring and other charges included in the consolidated statements of operations: Year Ended December 31, (in Millions) 2023 2022 2021 Restructuring charges: Severance-related and exit costs $ 2.4 $ 1.8 $ 0.2 Other charges: Cost related to the Allkem Livent Merger 54.1 2.9 — Environmental remediation 0.8 1.2 (0.3) Other (0.6) 1.6 3.9 Total restructuring and other charges $ 56.7 $ 7.5 $ 3.8

Environmental Obligations (Tabl

Environmental Obligations (Tables)	12 Months Ended
	Dec. 31, 2023
Environmental Remediation Obligations [Abstract]
Schedule of Environmental Reserves	The table below is a roll forward of our total environmental reserves. (in Millions) Environmental Reserves Total Balance as of December 31, 2021 $ 6.1 Change in reserves 1.2 Cash payments (0.3) Balance as of December 31, 2022 $ 7.0 Change in reserves 0.8 Cash payments (0.3) Balance as of December 31, 2023 $ 7.5
Schedule of Accrual for Environmental Contingencies	The table below provides detail of current and long-term environmental reserves. December 31, (in Millions) 2023 2022 Environmental reserves, current (1) $ 0.5 $ 0.6 Environmental reserves, long-term (2) 7.0 6.4 Total environmental reserves $ 7.5 $ 7.0 ______________ 1. These amounts are included within "Accrued and other liabilities" on the consolidated balance sheets. 2. These amounts are included in "Environmental liabilities" on the consolidated balance sheets.

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Schedule of Income before Income Tax, Domestic and Foreign	Domestic and foreign components of income from operations before income taxes are shown below: Year Ended December 31, (in Millions) 2023 2022 2021 Domestic $ 34.8 $ 133.2 $ (15.2) Foreign 354.2 202.2 39.1 Total $ 389.0 $ 335.4 $ 23.9
Schedule of Components of Income Tax Expense (Benefit)	The provision for income taxes attributable to income from operations consisted of: Year Ended December 31, (in Millions) 2023 2022 2021 Current: Federal $ 31.7 $ 43.7 $ 1.7 Foreign 27.6 5.6 2.6 State 0.6 1.3 — Total current $ 59.9 $ 50.6 $ 4.3 Deferred: Federal $ 4.5 $ (1.9) $ 1.3 Foreign (5.9) 13.3 17.7 State 0.4 (0.1) — Total deferred (1.0) 11.3 19.0 Total $ 58.9 $ 61.9 $ 23.3
Schedule of Effective Income Tax Rate Reconciliation	The effective income tax rate applicable to income from operations before income taxes was different from the statutory U.S. federal income tax rate due to the factors listed in the following table: Year Ended December 31, (in Millions) 2023 2022 2021 U.S. Federal statutory rate $ 81.7 $ 70.4 $ 5.1 Foreign earnings subject to different tax rates (78.9) (30.0) (1.2) Foreign derived intangible income (0.9) (2.1) (0.7) State and local income taxes, less federal income tax benefit 0.9 0.9 — Tax on intercompany dividends and deemed dividends for tax purposes 27.7 19.8 3.8 Changes to unrecognized tax benefits 0.4 (0.5) (0.9) Other permanent items 1.3 (2.8) (0.9) Change in valuation allowance (1) 66.0 (1.7) 4.4 Exchange gains and losses (2) (43.0) 6.9 12.7 Withholding taxes net of credits 4.7 0.6 0.8 Other (1.0) 0.4 0.2 Total tax provision $ 58.9 $ 61.9 $ 23.3 ____________________ 1. For the year ended December 31, 2023, the company recorded a valuation allowance of $60.3 million in 2023 to the statement of operations on the net deferred tax assets in Argentina, primarily relating to the net operating loss as a result of the significant fluctuations in foreign currency. These significant fluctuations in foreign currency impacts primarily occurred in December 2023. 2. Includes the impact of foreign currency exchange gains or losses in Argentina on net monetary assets for which no corresponding tax expense or benefit is realized and the tax provision for statutory taxable gains or losses in foreign jurisdictions for which there is no corresponding amount in income before taxes. Additionally, the years ended December 31, 2023, 2022 and 2021 include an adjustment relating to inflation.
Schedule of Deferred Tax Assets and Liabilities	Significant components of our deferred tax assets and liabilities were attributable to: Year Ended December 31, (in Millions) 2023 2022 Net operating loss carry-forwards and credits (1)(2) $ 239.2 $ 19.2 Exploration and development expenses (2) 12.0 — Other assets and reserves 29.5 13.9 Deferred tax assets $ 280.7 $ 33.1 Valuation allowance, net (3) (83.1) (2.8) Deferred tax assets, net of valuation allowance $ 197.6 $ 30.3 Property, plant and equipment, net (2) (281.8) (17.0) Intangibles (11.8) — Deferred inflationary gain (28.4) (28.4) Other liabilities (0.6) (0.6) Deferred tax liabilities (322.6) (46.0) Net deferred tax liabilities $ (125.0) $ (15.7) ___________________ 1. The year ended December 31, 2023 primarily relates to net operating losses generated in Argentina and Canada. The net operating losses in Canada relate to Nemaska Lithium, see Note 6 for details. 2. On October 18, 2023 we began consolidating Nemaska Lithium, see Note 6 for details. The company recorded $137.8 million of net operating loss carry-forwards and credits and $(188.4) million relating to property, plant and equipment, net. 3.
Schedule of Income Tax Contingencies	A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows: (in Millions) 2023 2022 2021 Balance at beginning of year $ 4.5 $ 2.9 $ 2.7 Increases related to positions taken in the current year 0.4 3.3 — Decreases related to positions taken in prior years — — (1.6) Increases related to positions taken in prior years — — 1.9 Decreases related to lapse of statutes of limitations (0.2) (0.1) (0.1) Settlement of uncertain tax positions — (1.6) — Balance at end of year $ 4.7 $ 4.5 $ 2.9

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2023
Debt Disclosure [Abstract]
Schedule of Long-Term Debt	Long-term debt consists of the following: Interest Rate Percentage Maturity December 31, 2023 December 31, 2022 (in Millions) SOFR borrowings Base rate borrowings Revolving Credit Facility (1) 7.20% 9.25% 2027 $ — $ — 4.125% Convertible Senior Notes due 2025 4.125% 2025 245.8 245.8 Transaction costs - 2025 Notes (2.4) (3.9) Nemaska - Prepayment agreement (2) 8.9% 75.0 — Discount - Prepayment agreement (19.8) — Nemaska - Other 3.4 — Subtotal long-term debt (including current maturities) 302.0 241.9 Less current maturities (2.4) — Total long-term debt $ 299.6 $ 241.9 ______________________________ 1. As of December 31, 2023 and December 31, 2022, there were $15.5 million and $14.9 million, respectively, in letters of credit outstanding under our Revolving Credit Facility and $484.5 million and $485.1 million available funds as of December 31, 2023 and December 31, 2022, respectively. Fund availability is subject to the Company meeting its debt covenants. 2.

Stock-based Compensation (Table

Stock-based Compensation (Tables)	12 Months Ended
	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan	We recognized the following stock compensation expense for awards under the Livent Plan: Year Ended December 31, (in Millions) 2023 2022 2021 Stock Option Expense, net of taxes of $0.3, $0.3 and $0.3 $ 1.7 $ 1.8 $ 1.6 Restricted Stock Expense, net of taxes of $0.9, $0.7 and $0.6 4.5 3.6 2.9 Performance-Based Restricted Stock Expense, net of taxes of $0.3 and $0.1 1.8 0.4 — Total Stock Compensation Expense, net of taxes of $1.5, $1.1 and $0.9 (1) $ 8.0 $ 5.8 $ 4.5 ____________________ 1.
Black Scholes Valuation Assumptions for Stock Option Grants	The following table contains Black Scholes valuation assumptions for stock option granted for the years ended December 31, 2023, 2022 and 2021: 2023 2022 2021 Expected dividend yield —% —% —% Expected volatility 30.2% 28.9% 27.0% Expected life (in years) 6.5 6.5 6.5 Risk-free interest rate 4.04% 1.95% 0.81% Valuation date stock price $23.33 Expected volatility 70.81% Risk free rate 4.41%
Summary of Stock Option Activity	The following table shows stock option activity, for the year ended December 31, 2023: Number of Options Granted But Not Exercised Weighted-Average Remaining Contractual Life Weighted-Average Exercise Price Per Share Aggregate Intrinsic Value (in Millions) Outstanding as of December 31, 2022 2,074,082 6.1 $ 15.16 $ 10.2 Granted 182,109 $ 23.33 Exercised (150,282) $ 10.41 $ 1.4 Forfeited (2,512) $ 22.01 Outstanding as of December 31, 2023 2,103,397 5.6 $ 16.19 $ 6.5 Exercisable as of December 31, 2023 1,206,667 4.2 $ 12.56 $ 6.5
Summary of Restricted Award Activity	The following table shows RSU activity for the year ended December 31, 2023: Restricted Stock Units Number of Weighted-Average Grant Date Fair Value Aggregate Intrinsic Value (in Millions) Nonvested as of December 31, 2022 789,115 $ 16.76 $ 15.7 Granted 245,530 $ 22.87 Vested (80,737) $ 10.45 Forfeited (3,380) $ 22.78 Nonvested as of December 31, 2023 950,528 $ 18.85 $ 17.1 The following table shows PRSU activity for the year ended December 31, 2023: Performance-Based Restricted Stock Units Number of Weighted-Average Grant Date Fair Value Aggregate Intrinsic Value (in Millions) Nonvested as of December 31, 2022 62,846 $ 20.82 $ 1.2 Granted 68,293 $ 24.59 Vested (89,973) $ 22.83 Forfeited (888) $ 22.55 Nonvested as of December 31, 2023 40,278 $ 22.68 $ 0.7

Equity (Tables)

Equity (Tables)	12 Months Ended
	Dec. 31, 2023
Equity [Abstract]
Schedule of Stock by Class	The following table reflects the changes in Livent's common shares issued and outstanding for each period presented: Issued Treasury Outstanding Balance as of December 31, 2021 161,791,602 (101,618) 161,689,984 RSU awards 113,565 — 113,565 Stock option awards 246,958 — 246,958 Net purchases of treasury stock - NQSP — (1,957) (1,957) Issuance of common stock 17,500,000 — 17,500,000 Balance as of December 31, 2022 179,652,125 (103,575) 179,548,550 RSU awards 134,903 — 134,903 PRSU awards 52,544 — 52,544 Stock option awards 151,979 — 151,979 Net purchases of treasury stock - NQSP — (6,013) (6,013) Issuance of common stock - conversion of 2025 Notes 114 — 114 Balance as of December 31, 2023 179,991,665 (109,588) 179,882,077
Schedule of Accumulated Other Comprehensive Income (Loss)	Summarized below is the roll forward of accumulated other comprehensive loss, net of tax. (in Millions) Foreign currency adjustments Derivative Instruments (1) Total Accumulated other comprehensive loss, net of tax as of December 31, 2021 $ (43.1) $ 0.2 $ (42.9) Other comprehensive income before reclassifications (7.9) (0.9) $ (8.8) Amounts reclassified from accumulated other comprehensive loss — 0.7 0.7 Accumulated other comprehensive loss, net of tax as of December 31, 2022 $ (51.0) $ — $ (51.0) Other comprehensive loss before reclassifications 1.2 (0.5) 0.7 Amounts reclassified from accumulated other comprehensive loss — 0.5 0.5 Accumulated other comprehensive loss, net of tax as of December 31, 2023 $ (49.8) $ — $ (49.8) ______________ 1. See Note 15 for more information.
Reclassifications of Accumulated Other Comprehensive Income	The table below provides details about the reclassifications from accumulated other comprehensive loss and the affected line items in the consolidated statement of operations for each of the periods presented. Details about Accumulated Other Comprehensive Loss Components Amounts Reclassified from Accumulated Other Comprehensive Loss Affected Line Item in the Consolidated Statements of Income (in Millions) Year ended December 31, 2023 Year ended December 31, 2022 Year ended December 31, 2021 Derivative instruments Foreign currency contracts $ 0.5 $ 0.9 $ (0.1) Costs of sales Total before tax 0.5 0.9 (0.1) — (0.2) — Provision for income taxes Amount included in net income $ 0.5 $ 0.7 $ (0.1) Total reclassifications for the period $ 0.5 $ 0.7 $ (0.1) Amount included in net income

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2023
Earnings Per Share [Abstract]
Calculation of Basic and Diluted Earnings Per Share	Earnings applicable to common stock and common stock shares used in the calculation of basic and diluted earnings per share are as follows: (in Millions, Except Per Share Data) Year Ended December 31, 2023 2022 2021 Numerator: Net income $ 330.1 $ 273.5 $ 0.6 Adjustment for interest on 2025 Notes, net of tax (1) — — 0.2 Net income after assumed conversion of 2025 Notes $ 330.1 $ 273.5 $ 0.8 Denominator: Weighted average common shares outstanding - basic 179.7 171.8 154.7 Dilutive share equivalents from share-based plans 1.4 1.7 1.5 Dilutive share equivalents from 2025 Notes 28.1 28.1 28.1 Weighted average common shares outstanding - diluted 209.2 201.6 184.3 Basic earnings per common share: Net income per weighted average share - basic $ 1.84 $ 1.59 $ — Diluted earnings per common share: Net income per weighted average share - diluted $ 1.58 $ 1.36 $ — _______________________________ 1. For the years ended December 31, 2023, 2022 and 2021

Financial Instruments, Risk M_2

Financial Instruments, Risk Management and Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Schedule of Financial Instrument Valuation Methods	Our other financial instruments include the following: Financial Instrument Valuation Method Foreign exchange forward contracts Estimated amounts that would be received or paid to terminate the contracts at the reporting date based on current market prices for applicable currencies.
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss)	The following tables summarize the gains or losses related to our cash flow hedges and derivatives not designated as cash flow hedging instruments. The Company has no open derivative cash flow hedge contracts as of December 31, 2023, and open derivative cash flow contracts with a liability position of less than $0.1 million as of December 31, 2022. Derivatives in Cash Flow Hedging Relationships (in Millions) Total Foreign Exchange Contracts Accumulated other comprehensive loss, net of tax at December 31, 2021 $ 0.2 Unrealized hedging losses, net of tax (0.9) Reclassification of deferred hedging losses, net of tax (1) 0.7 Total derivative instrument impact on comprehensive income, net of tax (0.2) Accumulated other comprehensive loss, net of tax at December 31, 2022 $ — Unrealized hedging losses, net of tax (0.5) Reclassification of deferred hedging losses, net of tax (1) 0.5 Total derivative instrument impact on comprehensive loss, net of tax — Accumulated other comprehensive loss, net of tax at December 31, 2023 $ — ____________________ 1. Amounts are included in "Cost of sales" on the consolidated statement of operations.
Schedule of Derivative Instruments, Gain (Loss) in Consolidated Statements of Income	Derivatives Not Designated as Cash Flow Hedging Instruments Location of Loss Amount of Pre-tax Loss Recognized in Income on Derivatives (1) Year Ended December 31, (in Millions) 2023 2022 2021 Foreign Exchange contracts Cost of sales $ (2.8) $ (5.2) $ (2.4) Total $ (2.8) $ (5.2) $ (2.4) ____________________ 1. Amounts in the columns represent the gain or loss on the derivative instrument offset by the gain or loss on the hedged item.
Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis	The following tables present our fair-value hierarchy for those assets and liabilities measured at fair-value on a recurring basis in our consolidated balance sheets as of December 31, 2023 and 2022. (in Millions) December 31, 2023 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Assets Investments in deferred compensation plan (1) $ 4.1 $ 4.1 $ — $ — Total Assets (3) $ 4.1 $ 4.1 $ — $ — Liabilities Deferred compensation plan obligation (2) $ 6.7 $ 6.7 $ — $ — Total Liabilities (3) $ 6.7 $ 6.7 $ — $ — (in Millions) December 31, 2022 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Assets Investments in deferred compensation plan (1) $ 3.1 $ 3.1 $ — — Total Assets $ 3.1 $ 3.1 $ — $ — Liabilities Deferred compensation plan obligation (2) $ 5.1 $ 5.1 $ — $ — Total Liabilities (3) $ 5.1 $ 5.1 $ — $ — ____________________ 1. Balance is included in "Other assets" in the consolidated balance sheets. Livent NQSP investments in Livent common stock are recorded as "Treasury stock" in the consolidated balance sheets and carried at historical cost. A mark-to-market gain of $0.2 million and a mark-to-market gain of $0.5 million related to the Livent common stock was recorded in "Selling, general and administrative expense" in the consolidated statements of operations for the years ended December 31, 2023 and December 31, 2022, respectively, with a corresponding offset to the deferred compensation plan obligation in the consolidated balance sheets. 2. Balance is included in "Other long-term liabilities" in the consolidated balance sheets. 3.

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Lease, Cost	Disclosures about our leases under ASC 842 are summarized in the table below. Year ended December 31, (in Millions) 2023 2022 2021 Lease Cost Operating lease cost (1) $ 1.4 $ 1.3 $ 1.2 Short-term lease cost 0.4 0.4 0.9 Variable lease cost (1) — — 0.1 Total lease cost (1) $ 1.8 $ 1.7 $ 2.2 Other information Cash paid for amounts included in the measurement of lease liabilities: Cash paid for operating leases $ 1.4 $ 1.3 $ 1.8 ____________________________ 1.
Lessee, Operating Lease, Liability, Maturity	The table below presents a maturity analysis of our operating lease liabilities for each of the next five years and a total of the amounts for the remaining years. (in Millions) Undiscounted cash flows 2024 $ 1.5 2025 1.5 2026 0.7 2027 0.3 2028 0.3 Thereafter 7.3 Total future minimum lease payments 11.6 Less: Imputed interest (4.7) Total $ 6.9

Supplemental Information (Table

Supplemental Information (Tables)	12 Months Ended
	Dec. 31, 2023
Balance Sheet Related Disclosures [Abstract]
Schedule of Other Assets	The following tables present details of prepaid and other current assets, other assets, accrued and other liabilities and other long-term liabilities as presented on the consolidated balance sheets: (in Millions) December 31, 2023 2022 Prepaid and other current assets Income tax receivable - refunds and prepayments $ 29.5 $ 22.0 Argentina government receivable (1) 7.9 6.7 Prepaid expenses 16.9 11.6 Other receivables 28.2 7.4 Bank Acceptance Drafts (2) — 6.9 Other current assets 3.9 6.5 Total $ 86.4 $ 61.1 (in Millions) December 31, 2023 2022 Other assets Argentina government receivable (1)(3) $ 71.3 $ 80.3 Advance to contract manufacturers (4) 27.6 17.2 Long-term raw materials inventory 1.0 1.6 Capitalized software, net 1.1 1.4 Other income tax related items 4.0 3.7 Other long-term assets 22.7 12.2 Total $ 127.7 $ 116.4 ____________________ 1. We have various subsidiaries that conduct business within Argentina. At December 31, 2023 and 2022, $38.8 million and $40.0 million of outstanding receivables due from the Argentina government, which primarily represent export tax and export rebate receivables, were denominated in U.S. dollars. A recent judicial decision relating to the U.S. dollar-denominated export tax receivable portion ($34.8 million) permits the Argentina government to reimburse us in Argentine pesos at the historical foreign exchange rate applicable at each past payment date, adjusted by a bank deposit interest rate. While Livent filed an appeal on November 6, 2023 and believes it has valid defenses on the technical merits, the ultimate resolution of this matter could result in a possible loss of up to $33.8 million. We continually review the recoverability of all outstanding receivables by analyzing historical experience, current collection trends and regional business and political factors among other factors. 2. Bank Acceptance Drafts are a common Chinese finance note used to settle trade transactions. Livent accepts these notes from Chinese customers based on criteria intended to ensure collectability and limit working capital usage. 3. In June 2023, the Company decided to pay $21.7 million for the export duties and interest claimed by the Customs Authorities of Buenos Aires, Ezeiza and Salta related to exports made between the years 2018 – 2022 registered in those locations. This payment stops the accrual of any further interest. It was a deposit made under protest, and was not an admission of any of the claims made by the Customs Authorities or a waiver of any of the Company's defenses, including recovery of the deposit plus interest. The cases remain in discussion. See Note 16 for more information. 4. We record deferred charges related to certain contract manufacturing agreements which we amortize over the term of the underlying contract.
Schedule of Other Liabilities	(in Millions) December 31, 2023 2022 Accrued and other current liabilities Accrued payroll $ 31.2 $ 19.8 Accrued investment in unconsolidated affiliate 27.0 0.1 Restructuring reserves 1.7 3.1 Retirement liability - 401K 3.2 2.6 Environmental reserves, current 0.5 0.6 Severance — 0.1 Other accrued and other current liabilities 73.2 11.1 Total $ 136.8 $ 37.4 (in Millions) December 31, 2023 2022 Other long-term liabilities Deferred compensation plan obligation $ 6.7 $ 5.1 Contingencies related to uncertain tax positions (1) 6.2 5.7 Self insurance reserves 1.1 1.5 Asset retirement obligations 3.7 0.2 Other long-term liabilities 3.6 3.4 Total $ 21.3 $ 15.9 ____________________ 1. As of December 31, 2023, we have recorded a liability for uncertain tax positions of $5.8 million and a $0.4 million indemnification liability to FMC for assets where the offsetting uncertain tax position is with FMC.

Subsequent Event (Tables)

Subsequent Event (Tables)	12 Months Ended
	Dec. 31, 2023
Subsequent Events [Abstract]
Schedule of Estimated fair Value of the Consideration Associated with the Allkem Livent Merger	The following table summarizes the fair value of the consideration associated with the Allkem Livent Merger: (in millions) Amount Fair value of Arcadium Shares issued to Allkem shareholders $ 4,385.6 Fair value of converted Allkem performance rights attributable to pre-combination service 4.8 Preliminary estimated aggregate purchase consideration $ 4,390.4

Principal Accounting Policies_4

Principal Accounting Policies and Related Financial Information - Property, Plant and Equipment (Details)	Dec. 31, 2023
Land improvements
Significant Accounting Policies [Line Items]
Useful life (in years)	20 years
Buildings | Minimum
Significant Accounting Policies [Line Items]
Useful life (in years)	20 years
Buildings | Maximum
Significant Accounting Policies [Line Items]
Useful life (in years)	40 years
Mining rights
Significant Accounting Policies [Line Items]
Useful life (in years)	33 years
Machinery and equipment | Minimum
Significant Accounting Policies [Line Items]
Useful life (in years)	3 years
Machinery and equipment | Maximum
Significant Accounting Policies [Line Items]
Useful life (in years)	18 years
Software | Minimum
Significant Accounting Policies [Line Items]
Useful life (in years)	3 years
Software | Maximum
Significant Accounting Policies [Line Items]
Useful life (in years)	10 years

Principal Accounting Policies_5

Principal Accounting Policies and Related Financial Information - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) segment remediation_site	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Oct. 18, 2023 USD ($)	Dec. 31, 2020
Significant Accounting Policies [Line Items]
Capitalized interest costs	$ 16.8	$ 15.8	$ 15.4
Asset retirement obligation	3.7	0.2
Goodwill	$ 120.7	0		$ 120.7
Number of reportable segments | segment	1
Number of environmental remediation sites | remediation_site	1
Remediation charges	$ 0.8	1.2	(0.3)
Environmental remediation liability	7.5	7	6.1
Foreign currency transaction losses	68.9	7	10.3
Other gain	$ 68.5	22.2	0
Minimum
Significant Accounting Policies [Line Items]
Payment term (in days)	30 days
Maximum
Significant Accounting Policies [Line Items]
Payment term (in days)	180 days
Patents
Significant Accounting Policies [Line Items]
Finite-lived intangible assets amortization period (in years)	15 years
Convertible Debt
Significant Accounting Policies [Line Items]
Capitalized interest costs	$ 11.6	$ 11.6	$ 11.4
Debt interest rate	4.125%
Convertible Senior Notes Due 2025 | Convertible Debt
Significant Accounting Policies [Line Items]
Debt interest rate	4.125%				4.125%

Revenue Recognition - Revenue B

Revenue Recognition - Revenue By Major Geographical Region (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 882.5	$ 813.2	$ 420.4
Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue	649.7	566.5	296.8
North America
Disaggregation of Revenue [Line Items]
Revenue	143.8	145.7	61.4
Europe, Middle East & Africa
Disaggregation of Revenue [Line Items]
Revenue	87.2	98.1	62.2
Latin America
Disaggregation of Revenue [Line Items]
Revenue	1.8	2.9	0
CHINA
Disaggregation of Revenue [Line Items]
Revenue	364.8	304.9	160
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenue	138.7	139.1	59.9
JAPAN
Disaggregation of Revenue [Line Items]
Revenue	136.9	$ 167.6	75.1
South Korea
Disaggregation of Revenue [Line Items]
Revenue	$ 123		$ 43.6

Revenue Recognition - Narrative

Revenue Recognition - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Contract liability - long-term	$ 217.8	$ 198		$ 198
Minimum
Disaggregation of Revenue [Line Items]
Contract payment term (in days)	30 days
Maximum
Disaggregation of Revenue [Line Items]
Contract payment term (in days)	180 days
Two Customers, One | Total Revenue | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	28%
Two Customers, Two | Total Revenue | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	22%
Ten Largest Customers | Total Revenue | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	72%	63%	69%
One Customer | Total Revenue | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk, percentage		24%	31%

Revenue Recognition - Revenue_2

Revenue Recognition - Revenue By Major Product Category (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 882.5	$ 813.2	$ 420.4
Lithium Hydroxide
Disaggregation of Revenue [Line Items]
Revenue	564.4	415.5	208
Butyllithium
Disaggregation of Revenue [Line Items]
Revenue	227.6	277.7	105.4
High Purity Lithium Metal and Other Specialty Compounds
Disaggregation of Revenue [Line Items]
Revenue	44.9	50.9	36.9
Lithium Carbonate and Lithium Chloride
Disaggregation of Revenue [Line Items]
Revenue	$ 45.6	$ 69.1	$ 70.1

Revenue Recognition - Assets an

Revenue Recognition - Assets and Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Receivables from contracts with customers, net of allowances	$ 106.7	$ 141.6
Contract liability - short term	4.4	15.5
Contract liability - long-term	217.8	198		$ 198
(Decrease)/increase contract liability - short-term	(11.1)	15.5	$ 0
(Decrease)/increase contract liability - long-term	0	$ 198	$ 0
Restatement Adjustment [Member]
Disaggregation of Revenue [Line Items]
(Decrease)/increase receivables from contracts with customers, net of allowances	(34.9)
(Decrease)/increase contract liability - short-term	(11.1)
(Decrease)/increase contract liability - long-term	$ 19.8

Revenue Recognition - Performan

Revenue Recognition - Performance Obligations (Details) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 $ in Billions	Dec. 31, 2023 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Expected timing of satisfaction of performance obligations	5 years
Remaining performance obligation	$ 1.9

Inventories, Net (Details)

Inventories, Net (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Inventory Disclosure [Abstract]
Finished goods	$ 59.1	$ 44.6
Semi-finished goods	108.8	57.1
Raw materials, supplies, and other	49.6	50.6
FIFO inventory, net	$ 217.5	$ 152.3

Investments - Narrative (Detail

Investments - Narrative (Details) - USD ($) $ in Millions		12 Months Ended
	Jun. 06, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Equity in net gain of unconsolidated affiliates		$ (23.1)	$ (15.1)	$ (5.5)
Quebec Lithium Partners UK
Schedule of Equity Method Investments [Line Items]
Voting interest percentage	50%				50%
Number of shares issued in transaction (in shares)	17,500,000
Equity method investments	$ 387.1
Cash and cash equivalents	0.3
Short-term debt	13.5
Issuance of common stock	$ 373.9
ESM ILiAD, LLC
Schedule of Equity Method Investments [Line Items]
Carrying amount of our investment		$ 30.1
Nemaska Lithium
Schedule of Equity Method Investments [Line Items]
Equity interest percentage	50%				25%
Equity method investments			$ 437.1
Nemaska Lithium | Canadian Government
Schedule of Equity Method Investments [Line Items]
Equity interest percentage	50%

Investments - Summarized Financ

Investments - Summarized Financial Information (Details) - USD ($) shares in Millions, $ in Millions		9 Months Ended	10 Months Ended	12 Months Ended
	Oct. 18, 2023	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
ASSETS
Cash and cash equivalents					$ 237.6	$ 189
Prepaid expenses					16.9	11.6
Other current assets					3.9	6.5
Total current assets					648.2	544
Accumulated depreciation					269.1	253.1
Property, plant and equipment					2,237.1	968.3
Goodwill	$ 120.7				120.7	0
Other non-current assets					127.7	116.4
Total assets					3,230.1	2,074.2
LIABILITIES AND EQUITY
Current portion of long-term debt					2.4	0
Total current liabilities					268.6	148.7
Long-term debt					299.6	241.9
Contract liability - long-term				$ 198	217.8	198
Asset retirement obligations					3.7	0.2
Deferred income taxes	113.4				126.4	16.1
Other long-term liabilities					21.3	15.9
Total current and long-term liabilities					946.3	631.2
Retained earnings					664.5	334.4
Total Livent stockholders’ equity					1,784.2	1,443
Noncontrolling interest					499.6	0
Total equity					2,283.8	1,443	$ 795.4	$ 536.2
Total liabilities and equity					3,230.1	2,074.2
Debt discount					2.4	3.9
Nemaska Lithium
ASSETS
Cash and cash equivalents	133.5					5.9	10.3
Sales tax receivable	9.2					2.5	0.4
Prepaid expenses	3.4					0.6	0.6
Other current assets						0.1	0
Assets held for sale						1	1.1
Total current assets	146.1					10.1	12.4
In-trust deposits	9.9					8.9	7.3
Accumulated depreciation						0.7	0.6
Property, plant and equipment	925.2					166.6	176.3
Intangible assets	52					29.5	31.9
Other non-current assets	0.5
Total non-current assets	1,108.3					205	215.5
Total assets	1,254.4					215.1	227.9
LIABILITIES AND EQUITY
Current portion of long-term debt	2.4					35.7	2.7
Accounts payable and accrued liabilities	59.8					4.1	2.1
Current portion of financial liability						0.5	9.5
Total current liabilities	62.2					40.3	14.3
Long-term debt	56.1					0	30.5
Contract liability - long-term	19.8
Non-current portion of unsecured obligation						2.3	5.1
Asset retirement obligations	3.4					6.9	6.4
Other long-term liabilities	0.3					0.4	0
Total non-current liabilities	193					9.6	42
Total current and long-term liabilities	255.2					49.9	56.3
Share capital						115	71.6
Contributed surplus						24	25.8
Retained earnings						26.2	74.2
Total Livent stockholders’ equity	499.6					165.2	171.6
Noncontrolling interest	499.6
Total equity	999.2
Total liabilities and equity	$ 1,254.4					215.1	$ 227.9
Weighted average amortization period	15 years
Supply agreement	$ 75
Number of shares issued (in shares)		60	60	20
Proceeds received		$ 70.2	$ 70.2	$ 50.6
Nemaska Lithium | Orion Promissory Note | Senior Notes
LIABILITIES AND EQUITY
Current portion of long-term debt					$ 33.2
Debt interest rate					8%
Nemaska Lithium | Unsecured Obligation | Unsecured Debt
LIABILITIES AND EQUITY
Current portion of long-term debt					$ 2.5
Debt interest rate					4.75%
Nemaska Lithium | Prepayment Agreement
LIABILITIES AND EQUITY
Debt discount					$ 19.8	$ 0
Debt interest rate					8.90%

Investments - Statement of Oper

Investments - Statement of Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
General and administrative costs	$ 63.2	$ 55.2	$ 49.9
Income from operations before income taxes	389	335.4	23.9
Income tax benefit	58.9	61.9	23.3
Net income	330.1	273.5	0.6
Nemaska Lithium
Schedule of Equity Method Investments [Line Items]
Operating costs	30.7	25.7	11.5
General and administrative costs	16.7	14.2	8
Other (income)/costs	(1.3)	4.3	2.5
Income from operations before income taxes	(46.1)	(44.2)	(22)
Income tax benefit	0	0	(0.2)
Net income	$ (46.1)	$ (44.2)	$ (21.8)

Investments - Cash Flow Informa

Investments - Cash Flow Information (Details) - USD ($) shares in Millions, $ in Millions		9 Months Ended	10 Months Ended	12 Months Ended
		Sep. 30, 2021	Sep. 30, 2021	Dec. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Cash provided by operating activities				$ 297.3	$ 454.7		$ 26.4
Cash used in investing activities:
Additions to property, plant and equipment	[1]			(327.1)	(336.9)		(131.9)
Increase in deposit to suppliers				(13.4)	(2.7)		(2)
Cash used in investing activities				(228.3)	(364.7)		(143.3)
Cash used in by financing activities:
Cash used in by financing activities				(20.4)	(12.5)		218
Effect of exchange rate changes on cash and cash equivalents				0	(1.5)		0.3
Increase in cash and cash equivalents				48.6	76		101.4
Cash and cash equivalents, beginning of period		$ 11.6		189	113		11.6
Cash and cash equivalents, end of period				237.6	189		113
Nemaska Lithium
Schedule of Equity Method Investments [Line Items]
Cash provided by operating activities					(41.6)		(15)
Cash used in investing activities:
Additions to property, plant and equipment					(1.4)		0
Purchases of intangible assets					(0.1)		0
Proceeds from sale of assets					0		0.3
Increase in deposit to suppliers					0		(0.8)
Cash used in investing activities					(1.5)		(0.5)
Cash used in by financing activities:
Proceeds from issuance of shares					50.6		70.2
Debt repayment			$ (50)		(8.8)		(50)
Payment of unsecured obligation					(2.6)		(2.7)
Cash used in by financing activities					39.2		17.5
Effect of exchange rate changes on cash and cash equivalents					(0.5)		0.6
Increase in cash and cash equivalents					(4.4)		2.6
Cash and cash equivalents, beginning of period		$ 7.7		$ 5.9	10.3		7.7
Cash and cash equivalents, end of period					5.9		10.3
Number of shares issued (in shares)		60	60			20
Proceeds received		$ 70.2	$ 70.2			$ 50.6
Repayments of debt			$ 50		$ 8.8		$ 50
[1] For the years ended December 31, 2023, 2022, and 2021, $16.8 million , $15.8 million, and $15.4 million of interest was capitalized, respectively.

Property, Plant and Equipment_3

Property, Plant and Equipment, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Total cost	$ 2,506.2	$ 1,221.4
Accumulated depreciation	(269.1)	(253.1)
Property, plant and equipment, net	2,237.1	968.3
Depreciation	26.6	25.1	$ 22.9
Land and land improvements
Property, Plant and Equipment [Line Items]
Total cost	106.2	87
Buildings
Property, Plant and Equipment [Line Items]
Total cost	134.9	85.8
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total cost	420.7	333.4
Mineral rights
Property, Plant and Equipment [Line Items]
Total cost	560	0
Construction in progress
Property, Plant and Equipment [Line Items]
Total cost	$ 1,284.4	$ 715.2

Restructuring and Other Charg_3

Restructuring and Other Charges - Restructuring Charges in Consolidated Income (Details)	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jun. 26, 2023 a
Other charges:
Cost related to the Allkem Livent Merger	$ 54,100,000	$ 2,900,000	$ 0
Environmental remediation	800,000	1,200,000	(300,000)
Other	(600,000)	1,600,000	3,900,000
Total restructuring and other charges	56,700,000	7,500,000	3,800,000
Bessemer City Plant Fire
Other charges:
Area of land | a				800
Asset impairment charges	0
Severance-related and exit costs
Restructuring charges:
Restructuring charges	$ 2,400,000	$ 1,800,000	$ 200,000

Environmental Obligations - Nar

Environmental Obligations - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Environmental Remediation Obligations [Abstract]
Accrual for environmental loss contingencies	$ 7.5	$ 7	$ 6.1
Loss exposure in excess of accrual	$ 2.1

Environmental Obligations - Env

Environmental Obligations - Environmental Reserve Rollforward (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Accrual for Environmental Loss Contingencies [Roll Forward]
Total environmental reserves, net of recoveries, beginning balance	$ 7	$ 6.1
Change in reserves	0.8	1.2
Cash payments	(0.3)	(0.3)
Total environmental reserves, net of recoveries, ending balance	$ 7.5	$ 7

Environmental Obligations - Res

Environmental Obligations - Reserves (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Environmental Remediation Obligations [Abstract]
Environmental reserves, current	$ 0.5	$ 0.6
Environmental Loss Contingency, Current, Statement of Financial Position [Extensible Enumeration]	Accrued and other liabilities	Accrued and other liabilities
Environmental reserves, long-term	$ 7	$ 6.4
Total environmental reserves	$ 7.5	$ 7	$ 6.1
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]	Environmental reserves, long-term, Accrued and other liabilities	Environmental reserves, long-term, Accrued and other liabilities

Income Taxes - Domestic and For

Income Taxes - Domestic and Foreign Income Tax Components (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Domestic	$ 34.8	$ 133.2	$ (15.2)
Foreign	354.2	202.2	39.1
Income from operations before income taxes	$ 389	$ 335.4	$ 23.9

Income Taxes - Provision (Benef

Income Taxes - Provision (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current:
Federal	$ 31.7	$ 43.7	$ 1.7
Foreign	27.6	5.6	2.6
State	0.6	1.3	0
Total current	59.9	50.6	4.3
Deferred:
Federal	4.5	(1.9)	1.3
Foreign	(5.9)	13.3	17.7
State	0.4	(0.1)	0
Total deferred	(1)	11.3	19
Total	$ 58.9	$ 61.9	$ 23.3

Income Taxes - Deferred Tax Ass

Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Oct. 18, 2023	Dec. 31, 2022
Deferred Tax Assets, Gross [Abstract]
Net operating loss carry-forwards and credits	$ 239.2		$ 19.2
Exploration and development expenses	12		0
Other assets and reserves	29.5		13.9
Deferred tax assets	280.7		33.1
Valuation allowance, net	(83.1)		(2.8)
Deferred tax assets, net of valuation allowance	197.6		30.3
Property, plant and equipment, net	(281.8)		(17)
Intangibles	(11.8)		0
Deferred inflationary gain	(28.4)		(28.4)
Other liabilities	(0.6)		(0.6)
Deferred tax liabilities	(322.6)		(46)
Net deferred tax liabilities	(125)		$ (15.7)
Operating loss carryforwards	$ 233.1	$ 137.8
Operating credit carryforwards		$ (188.4)

Income Taxes - Effective Income

Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
U.S. Federal statutory rate	$ 81.7	$ 70.4	$ 5.1
Foreign earnings subject to different tax rates	(78.9)	(30)	(1.2)
Foreign derived intangible income	(0.9)	(2.1)	(0.7)
State and local income taxes, less federal income tax benefit	0.9	0.9	0
Tax on intercompany dividends and deemed dividends for tax purposes	27.7	19.8	3.8
Changes to unrecognized tax benefits	0.4	(0.5)	(0.9)
Other permanent items	1.3	(2.8)	(0.9)
Change in valuation allowance	66	(1.7)	4.4
Exchange gains and losses	(43)	6.9	12.7
Withholding taxes net of credits	4.7	0.6	0.8
Other	(1)	0.4	0.2
Total	58.9	61.9	$ 23.3
Valuation allowance	$ 83.1	$ 2.8

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) jurisdiction	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Oct. 18, 2023 USD ($)
Income Tax Contingency [Line Items]
Valuation allowance	$ 83,100,000	$ 2,800,000
Operating loss carryforwards	$ 233,100,000			$ 137,800,000
Number of significant foreign jurisdictions | jurisdiction	2
Unrecognized tax benefits that would impact effective tax rate	$ 2,000,000
Interest and penalties recognized	300,000	200,000	$ (100,000)
Interest and penalties accrued	1,100,000	800,000
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	4,500,000	2,900,000	2,700,000
Increases related to positions taken in the current year	400,000	3,300,000	0
Decreases related to positions taken in prior years	0	0	(1,600,000)
Increases related to positions taken in prior years	0	0	1,900,000
Decreases related to lapse of statutes of limitations	(200,000)	(100,000)	(100,000)
Settlement of uncertain tax positions	0	(1,600,000)	0
Balance at end of year	4,700,000	4,500,000	$ 2,900,000
Minimum
Income Tax Contingency [Line Items]
Possible decrease in unrecognized tax benefits	0
Maximum
Income Tax Contingency [Line Items]
Possible decrease in unrecognized tax benefits	3,900,000
TMA Agreement, Indemnification Asset
Income Tax Contingency [Line Items]
Indemnification asset	1,000,000
Argentina
Income Tax Contingency [Line Items]
Valuation allowance	$ 60,300,000
Operating loss carryforwards		$ 17,600,000
Operating loss carryforwards, expiring period	5 years	5 years
Argentina | Foreign Tax Authority
Income Tax Contingency [Line Items]
Valuation allowance	$ 80,200,000
Canada
Income Tax Contingency [Line Items]
Operating loss carryforwards, expiring period	20 years

Debt - Long-term Debt (Details)

Debt - Long-term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2023	Oct. 18, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Transaction costs/discount	$ (2.4)		$ (3.9)
Subtotal long-term debt (including current maturities)	302		241.9
Less current maturities	(2.4)		0
Long-term debt	$ 299.6		241.9
Nemaska Lithium
Debt Instrument [Line Items]
Less current maturities		$ (2.4)	(35.7)	$ (2.7)
Long-term debt		$ 56.1	0	$ 30.5
Nemaska Lithium | Prepayment Agreement
Debt Instrument [Line Items]
Convertible debt, interest rate	8.90%
Transaction costs/discount	$ (19.8)		0
Nemaska - Prepayment agreement/Other	75		0
Nemaska Lithium | Other
Debt Instrument [Line Items]
Nemaska - Prepayment agreement/Other	$ 3.4		0
Convertible Debt
Debt Instrument [Line Items]
Convertible debt, interest rate	4.125%
Long-term debt, gross	$ 245.8		245.8
Revolving Credit Facility
Debt Instrument [Line Items]
Letters of credit outstanding, amount	15.5		14.9
Line of credit, remaining borrowing capacity	484.5		485.1
Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Long-term debt, gross	$ 0		$ 0
SOFR borrowings | Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility, interest rate	7.20%
Base rate borrowings | Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility, interest rate	9.25%

Debt - Narrative (Details)

Debt - Narrative (Details) $ / shares in Units, $ in Millions			3 Months Ended	12 Months Ended
	Jan. 04, 2024 $ / shares shares	Sep. 01, 2022 USD ($)	Mar. 31, 2024 day	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) day $ / shares shares
Debt Instrument [Line Items]
Loss on debt extinguishment				$ 0	$ 0.1	$ 0
Convertible Debt
Debt Instrument [Line Items]
Debt interest rate				4.125%
Convertible Debt | Subsequent Event | Forecast | Conversion Circumstance One
Debt Instrument [Line Items]
Percentage of conversion price			130%
Trading days | day			20
Consecutive trading days | day			30
Convertible Senior Notes Due 2025 | Convertible Debt
Debt Instrument [Line Items]
Aggregate principal amount of debt							$ 245.8
Debt interest rate				4.125%			4.125%
Conversion ratio (in shares) | shares							0.1144885
Initial conversion price per share (in dollars per share) | $ / shares							$ 8.73
Percentage of conversion price							130%
Trading days | day							20
Consecutive trading days | day							30
Redemption price, percentage of principal amount							100%
Business day period | day							5
Consecutive trading day period | day							5
Trading price as percentage of closing price of common stock							98%
Amortization of discount and transaction costs				$ 1.5	1.5
Debt discount, excluding amortization				10.1	$ 10.2
Convertible Senior Notes Due 2025 | Convertible Debt | Subsequent Event
Debt Instrument [Line Items]
Conversion ratio (in shares) | shares	0.275459331
Initial conversion price per share (in dollars per share) | $ / shares	$ 3.63
Convertible Senior Notes, Over-Allotment Option | Convertible Debt
Debt Instrument [Line Items]
Net cash proceeds from debt							$ 238.2
Payments of debt issuance costs							$ 7.6
Credit Agreement | Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 500
Maximum increase in revolving credit commitments		$ 700
Floor rate		0%
Commitment fee percentage		0.25%
Deferred financing costs				2.2
Loss on debt extinguishment				0.1
Deferred financing costs				$ 2.3
Net leverage ratio				3.5
Minimum interest coverage ratio				3.5
Credit Agreement | Line of Credit | Revolving Credit Facility | SOFR borrowings
Debt Instrument [Line Items]
Basis spread on variable rate		0.10%
Credit Agreement | Line of Credit | Letter of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 50

Stock-based Compensation - Narr

Stock-based Compensation - Narrative (Details)				12 Months Ended
	Dec. 22, 2023 USD ($)	Feb. 22, 2023 $ / shares	Feb. 23, 2022	Dec. 31, 2023 USD ($) publicly_traded_peer $ / shares shares	Dec. 31, 2022 USD ($) $ / shares	Dec. 31, 2021 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of publicly traded peers | publicly_traded_peer				14
Weighted average grant date fair value (in dollars per share) | $ / shares				$ 9.22	$ 7.01	$ 5.86
Exercise of stock options					$ 3,200,000	$ 1,500,000
Stock option awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award, expiration period (in years)				10 years
Unrecognized compensation cost related to unvested stock options				$ 1,800,000	2,100,000
Requisite service period (in years)				1 year 8 months 12 days
Exercise of stock options					$ 4,900,000	$ 1,200,000
RSU awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value (in dollars per share) | $ / shares				$ 22.87	$ 22.72	$ 20.12
Requisite service period (in years)				1 year 8 months 12 days
Intrinsic value of awards vested				$ 1,800,000	$ 4,700,000	$ 5,000,000
Fair value of awards vested				800,000	$ 2,500,000	$ 3,200,000
Unrecognized compensation cost				$ 5,900,000
Granted (in dollars per share) | $ / shares				$ 22.87
PRSU awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Requisite service period (in years)				1 year 8 months 12 days
Fair value of awards vested	$ 89,973
Unrecognized compensation cost				$ 400,000
Performance period (in years)			3 years
Granted (in dollars per share) | $ / shares		$ 24.59		$ 24.59
PRSU awards | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	0%		0%
PRSU awards | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	100%		200%
Livent Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized (in shares) | shares				10,683,837
Livent Plan | Stock option awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award, expiration period (in years)				10 years

Stock-based Compensation - Stoc

Stock-based Compensation - Stock Compensation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	$ 8	$ 5.8	$ 4.5
Compensation expense taxes	1.5	1.1	0.9
Stock option awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	1.7	1.8	1.6
Compensation expense taxes	0.3	0.3	0.3
RSU awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	4.5	3.6	2.9
Compensation expense taxes	0.9	0.7	0.6
PRSU awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	1.8	0.4	0
Compensation expense taxes	0.3	0.1
Selling, General and Administrative Expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Gross stock compensation charges	8.4	6.8	$ 5.3
Restructuring Charges
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Gross stock compensation charges	$ 1.1	$ 0.1

Stock-based Compensation - Blac

Stock-based Compensation - Black Scholes Assumptions (Details) - Stock option awards	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	0%	0%	0%
Expected volatility	30.20%	28.90%	27%
Expected life (in years)	6 years 6 months	6 years 6 months	6 years 6 months
Risk-free interest rate	4.04%	1.95%	0.81%

Stock-based Compensation - St_2

Stock-based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Number of Options Granted But Not Exercised
Beginning balance (in shares)	2,074,082
Granted (in shares)	182,109
Exercised (in shares)	(150,282)
Forfeited (in shares)	(2,512)
Ending balance (in shares)	2,103,397	2,074,082
Exercisable (in shares)	1,206,667
Weighted-Average Remaining Contractual Life (in Years)
Outstanding	5 years 7 months 6 days	6 years 1 month 6 days
Exercisable	4 years 2 months 12 days
Weighted-Average Exercise Price Per Share
Outstanding (in dollars per share)	$ 15.16
Granted (in dollars per share)	23.33
Exercised (in dollars per share)	10.41
Forfeited (in dollars per share)	22.01
Outstanding (in dollars per share)	16.19	$ 15.16
Exercisable (in dollars per share)	$ 12.56
Aggregate Intrinsic Value (in Millions)
Outstanding	$ 6.5	$ 10.2
Exercised	1.4
Exercisable	$ 6.5

Stock-based Compensation - St_3

Stock-based Compensation - Stock Activity (Details) - USD ($) $ / shares in Units, $ in Millions			12 Months Ended
	Feb. 22, 2023	Feb. 23, 2022	Dec. 31, 2023	Dec. 31, 2022
RSU awards
Number of awards
Nonvested, beginning balance (in shares)			789,115
Granted (in shares)			245,530
Vested (in shares)			(80,737)
Forfeited (in shares)			(3,380)
Nonvested, ending balance (in shares)			950,528
Weighted-Average Grant Date Fair Value
Nonvested, beginning balance (in dollars per share)			$ 16.76
Granted (in dollars per share)			22.87
Vested (in dollars per share)			10.45
Forfeited (in dollars per share)			22.78
Nonvested, ending balance (in dollars per share)			$ 18.85
Aggregate Intrinsic Value (in Millions)
Aggregate intrinsic value			$ 17.1	$ 15.7
PRSU awards
Number of awards
Nonvested, beginning balance (in shares)			62,846
Granted (in shares)		68,000	68,293
Vested (in shares)			(89,973)
Forfeited (in shares)			(888)
Nonvested, ending balance (in shares)			40,278
Weighted-Average Grant Date Fair Value
Nonvested, beginning balance (in dollars per share)			$ 20.82
Granted (in dollars per share)	$ 24.59		24.59
Vested (in dollars per share)			22.83
Forfeited (in dollars per share)			22.55
Nonvested, ending balance (in dollars per share)			$ 22.68
Aggregate Intrinsic Value (in Millions)
Aggregate intrinsic value			$ 0.7	$ 1.2

Stock-based Compensation - Fair

Stock-based Compensation - Fair Value Assumptions (Details) - PRSU awards	12 Months Ended
	Dec. 31, 2023 $ / shares
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Share price (USD per share)	$ 23.33
Expected volatility	70.81%
Risk free rate	4.41%

Equity - Summary of Common Stoc

Equity - Summary of Common Stock Activity (Details) - shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Issued
Beginning balance (in shares)	179,652,125	161,791,602
Ending balance (in shares)	179,991,665	179,652,125
Treasury
Beginning balance (in shares)	(103,575)	(101,618)
Net purchases of treasury stock - NQSP (in shares)	(6,013)	(1,957)
Ending balance (in shares)	(109,588)	(103,575)
Outstanding
Beginning balance (in shares)	179,548,550	161,689,984
Net purchases of treasury stock - NQSP (in shares)	(6,013)	(1,957)
Ending balance (in shares)	179,882,077	179,548,550
Common stock
Issued
Stock issued during period (in shares)	114	17,500,000
Outstanding
Stock issued during period (in shares)	114	17,500,000
PRSU awards
Issued
Stock issued during period (in shares)	52,544
Outstanding
Stock issued during period (in shares)	52,544
Livent Plan | RSU awards
Issued
Stock issued during period (in shares)	134,903	113,565
Outstanding
Stock issued during period (in shares)	134,903	113,565
Livent Plan | Stock option awards
Issued
Stock issued during period (in shares)	151,979	246,958
Outstanding
Stock issued during period (in shares)	151,979	246,958

Equity - Additional Information

Equity - Additional Information (Details) - USD ($)		12 Months Ended
	Jun. 06, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Common stock, par value (in dollars per share)		$ 0.001	$ 0.001	$ 0.001	$ 0.001
Dividends paid		$ 0	$ 0	$ 0
Quebec Lithium Partners UK
Class of Stock [Line Items]
Number of shares issued in transaction (in shares)	17,500,000
Common stock, par value (in dollars per share)	$ 0.001
Voting interest percentage	50%				50%

Equity - Schedule of Accumulate

Equity - Schedule of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,443
Other comprehensive income (loss) before reclassifications	0.7	$ (8.8)
Amounts reclassified from accumulated other comprehensive loss	0.5	0.7
Ending balance	1,784.2	1,443
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(51)	(42.9)
Ending balance	(49.8)	(51)
Foreign currency adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(51)	(43.1)
Other comprehensive income (loss) before reclassifications	1.2	(7.9)
Amounts reclassified from accumulated other comprehensive loss	0	0
Ending balance	(49.8)	(51)
Derivative Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	0	0.2
Other comprehensive income (loss) before reclassifications	(0.5)	(0.9)
Amounts reclassified from accumulated other comprehensive loss	0.5	0.7
Ending balance	$ 0	$ 0

Equity - Reclassification Out o

Equity - Reclassification Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	$ (389)	$ (335.4)	$ (23.9)
Income tax benefit	58.9	61.9	23.3
Net income	(330.1)	(273.5)	(0.6)
Amounts Reclassified from Accumulated Other Comprehensive Loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income	0.5	0.7	(0.1)
Derivative Instruments | Amounts Reclassified from Accumulated Other Comprehensive Loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	0.5	0.9	(0.1)
Income tax benefit	0	(0.2)	0
Net income	0.5	0.7	(0.1)
Foreign currency contracts | Derivative Instruments | Amounts Reclassified from Accumulated Other Comprehensive Loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Costs of sales	$ 0.5	$ 0.9	$ (0.1)

Earnings Per Share - EPS Comput

Earnings Per Share - EPS Computation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Numerator:
Net income	$ 330.1	$ 273.5	$ 0.6
Adjustment for interest on 2025 Notes, net of tax	0	0	0.2
Net income after assumed conversion of 2025 Notes	330.1	273.5	0.8
Net income after assumed conversion of 2025 Notes	$ 330.1	$ 273.5	$ 0.8
Denominator:
Weighted average common shares outstanding - basic (in shares)	179.7	171.8	154.7
Dilutive share equivalents from share-based plans (in shares)	1.4	1.7	1.5
Dilutive share equivalents from 2025 Notes (in shares)	28.1	28.1	28.1
Weighted average common shares outstanding – diluted (in shares)	209.2	201.6	184.3
Basic earnings per common share:
Net income per weighted average share - basic (in dollars per share)	$ 1.84	$ 1.59	$ 0
Diluted earnings per common share:
Net income per weighted average share - diluted (in dollars per share)	$ 1.58	$ 1.36	$ 0
Capitalized interest costs	$ 16.8	$ 15.8	$ 15.4
Convertible Debt
Diluted earnings per common share:
Capitalized interest costs	$ 11.6	$ 11.6	$ 11.4

Earnings Per Share - Narrative

Earnings Per Share - Narrative (Details) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities, exercise price (in dollars per share)	$ 23.33
Stock option awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	155,404	0	0
Antidilutive securities, exercise price (in dollars per share)	$ 23.33

Financial Instruments, Risk M_3

Financial Instruments, Risk Management and Fair Value Measurements - Narrative (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Debt value	$ 571,200,000
Total long-term debt	302,000,000	$ 241,900,000
Liabilities fair value disclosure	6,700,000	5,100,000
Designated as Hedging Instrument | Cash Flow Hedging
Derivative [Line Items]
Liabilities fair value disclosure	0	$ 100,000
Foreign currency contracts | Not Designated as Hedging Instrument
Derivative [Line Items]
Notional amount	$ 97,700,000

Financial Instruments, Risk M_4

Financial Instruments, Risk Management and Fair Value Measurements - Derivatives in Cash Flow Hedging Relationships (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,443
Unrealized hedging losses, net of tax	0.7	$ (8.8)
Reclassification of deferred hedging gains, net of tax	0.5	0.7
Total derivative instrument impact on comprehensive income (loss), net of tax	1.2	(8.1)	$ 1.5
Ending balance	1,784.2	1,443
Derivative Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	0	0.2
Unrealized hedging losses, net of tax	(0.5)	(0.9)
Reclassification of deferred hedging gains, net of tax	0.5	0.7
Total derivative instrument impact on comprehensive income (loss), net of tax	0	(0.2)
Ending balance	$ 0	$ 0	$ 0.2

Financial Instruments, Risk M_5

Financial Instruments, Risk Management and Fair Value Measurements - Derivatives Not Designated As Cash Flow Hedging Instruments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Amount of pre-tax loss recognized in income on derivatives	$ (2.8)	$ (5.2)	$ (2.4)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Costs of sales	Costs of sales	Costs of sales
Foreign Exchange contracts
Derivative [Line Items]
Amount of pre-tax loss recognized in income on derivatives	$ (2.8)	$ (5.2)	$ (2.4)

Financial Instruments, Risk M_6

Financial Instruments, Risk Management and Fair Value Measurements - Recurring Fair Value Measurements (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Assets
Investments in deferred compensation plan	$ 4,100,000	$ 3,100,000
Total Assets	4,100,000	3,100,000
Liabilities
Deferred compensation plan obligation	6,700,000	5,100,000
Total Liabilities	6,700,000	5,100,000
Cash Flow Hedging | Designated as Hedging Instrument
Liabilities
Total Liabilities	0	100,000
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Investments in deferred compensation plan	4,100,000	3,100,000
Total Assets	4,100,000	3,100,000
Liabilities
Deferred compensation plan obligation	6,700,000	5,100,000
Total Liabilities	6,700,000	5,100,000
Significant Other Observable Inputs (Level 2)
Assets
Investments in deferred compensation plan	0	0
Total Assets	0	0
Liabilities
Deferred compensation plan obligation	0	0
Total Liabilities	0	0
Significant Unobservable Inputs (Level 3)
Assets
Investments in deferred compensation plan	0	0
Total Assets	0	0
Liabilities
Deferred compensation plan obligation	0	0
Total Liabilities	0	0
Selling, General and Administrative Expenses
Liabilities
Mark-to-market gain (loss)	$ 200,000	$ 500,000

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) $ in Millions	Dec. 31, 2023 USD ($)	Oct. 31, 2023	Oct. 26, 2023	Feb. 07, 2023
Lessor, Lease, Description [Line Items]
Operating lease, weighted average remaining lease term (in years)	17 years 9 months 18 days
Operating lease, weighted average discount rate (as a percent)	6.50%
Export rate, percent of FOB value			1.50%	4%
Export LA Puna rate, percent of FOB value				0.025
Remaining export rate, percent of FOB value		0.015		0.015
Export rebate receivable	$ 3.9
Minimum
Lessor, Lease, Description [Line Items]
Remaining lease term (in years)	2 years
Maximum
Lessor, Lease, Description [Line Items]
Remaining lease term (in years)	27 years

Commitments and Contingencies_2

Commitments and Contingencies - Lease Cost and Terms (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Operating lease cost	$ 1.4	$ 1.3	$ 1.2
Short-term lease cost	0.4	0.4	0.9
Variable lease cost	0	0	0.1
Total lease cost	1.8	1.7	2.2
Cash paid for amounts included in the measurement of lease liabilities:
Cash paid for operating leases	$ 1.4	$ 1.3	$ 1.8

Commitments and Contingencies_3

Commitments and Contingencies - Maturity of Operating Lease Liabilities (Details) $ in Millions	Dec. 31, 2023 USD ($)
Undiscounted cash flows
2024	$ 1.5
2025	1.5
2026	0.7
2027	0.3
2028	0.3
Thereafter	7.3
Total future minimum lease payments	11.6
Less: Imputed interest	(4.7)
Total	$ 6.9

Supplemental Information (Detai

Supplemental Information (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Nov. 06, 2023
Prepaid and other current assets
Income tax receivable - refunds and prepayments		$ 29.5	$ 22
Argentina government receivable		7.9	6.7
Prepaid expenses		16.9	11.6
Other receivables		28.2	7.4
Bank Acceptance Drafts		0	6.9
Other current assets		3.9	6.5
Total		86.4	61.1
Other assets
Argentina government receivable		71.3	80.3
Advance to contract manufacturers		27.6	17.2
Long-term raw materials inventory		1	1.6
Capitalized software, net		1.1	1.4
Other income tax related items		4	3.7
Other long-term assets		22.7	12.2
Total		127.7	116.4
Export tax receivable portion		34.8
Payment of deposit to customs authorities	$ 21.7	21.7	0	$ 0
Accrued and other current liabilities
Accrued payroll		31.2	19.8
Accrued investment in unconsolidated affiliate		27	0.1
Restructuring reserves		1.7	3.1
Retirement liability - 401K		3.2	2.6
Environmental reserves, current		0.5	0.6
Severance		0	0.1
Other accrued and other current liabilities		73.2	11.1
Total		136.8	37.4
Other long-term liabilities
Deferred compensation plan obligation		6.7	5.1
Contingencies related to uncertain tax positions		6.2	5.7
Self insurance reserves		1.1	1.5
Asset retirement obligations		3.7	0.2
Other long-term liabilities		3.6	3.4
Total		21.3	15.9
TMA Agreement, Uncertain Tax Positions
Other long-term liabilities
Contingencies related to uncertain tax positions		5.8
TMA Agreement, Indemnification Liability
Other long-term liabilities
Contingencies related to uncertain tax positions		0.4
Argentina Government
Other assets
Export tax and export rebate receivables		$ 38.8	$ 40
Estimate of possible loss					$ 33.8

Subsequent Event - Narrative (D

Subsequent Event - Narrative (Details) $ / shares in Units, $ in Millions		12 Months Ended
	Jan. 04, 2024 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares	Dec. 31, 2022 $ / shares	Dec. 31, 2021 $ / shares	Dec. 31, 2020 $ / shares
Subsequent Event [Line Items]
Common stock, par value (in dollars per share) | $ / shares		$ 0.001	$ 0.001	$ 0.001	$ 0.001
Allkem Livent Merger
Subsequent Event [Line Items]
Business acquisition, pro forma revenue | $		$ 2,000
Allkem Livent Merger | Subsequent Event
Subsequent Event [Line Items]
Business acquisition, share price (in dollars per share) | $ / shares	$ 1
Common stock, par value (in dollars per share) | $ / shares	$ 0.001
Conversion ratio	2.406
Preliminary estimated aggregate purchase consideration | $	$ 4,390.4
Allkem Livent Merger | Subsequent Event | Former Livent Stockholders
Subsequent Event [Line Items]
Number of shares issued in transaction (in shares)	433,156,855
Allkem Livent Merger | Subsequent Event | Former Allkem Shareholders
Subsequent Event [Line Items]
Number of shares issued in transaction (in shares)	641,337,840
Allkem Livent Merger | Subsequent Event | CHESS Depositary Instrument
Subsequent Event [Line Items]
Share consideration per share	1
Allkem Livent Merger | Subsequent Event | CHESS Depositary Instrument | Former Allkem Shareholders
Subsequent Event [Line Items]
Number of shares issued in transaction (in shares)	542,612,224
Allkem Livent Merger | Subsequent Event | Common stock
Subsequent Event [Line Items]
Share consideration per share	1
Allkem Livent Merger | Subsequent Event | Common stock | Former Allkem Shareholders
Subsequent Event [Line Items]
Number of shares issued in transaction (in shares)	98,725,616

Subsequent Event - Estimated fa

Subsequent Event - Estimated fair Value of the Consideration Associated with the Allkem Livent Merger (Details) - Allkem Livent Merger - Subsequent Event $ in Millions	Jan. 04, 2024 USD ($)
Subsequent Event [Line Items]
Fair value of Arcadium Shares issued to Allkem shareholders	$ 4,385.6
Fair value of converted Allkem performance rights attributable to pre-combination service	4.8
Preliminary estimated aggregate purchase consideration	$ 4,390.4