CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
Cash provided by operating activities:
Net income/(loss)		$ 0.6		$ (16.3)	[1]	$ 50.2
Adjustments to reconcile net income/(loss) to cash provided by operating activities:
Depreciation and amortization		25.1		25.0	[2]	20.9
Restructuring and other (income)/charges		(1.5)		3.3	[2]	2.1
Separation-related (income)/charges		0.0		(0.3)	[2]	0.9
Deferred income taxes		12.5		(6.3)	[2]	(0.9)
Share-based compensation		5.3		4.1	[2]	4.3
Change in investments in trust fund securities		0.6		1.0	[2]	0.1
Equity in net loss of unconsolidated affiliates		5.5		0.5	[2]	0.0
Loss on debt extinguishment		0.0		0.1	[2]	0.0
Deferred financing fee amortization		0.3		0.7	[2]	0.0
Loss on asset disposal		0.5		0.6	[2]	0.0
Changes in operating assets and liabilities:
Trade receivables, net		(19.0)		15.3	[2]	51.4
Changes in deferred compensation		1.4		0.7	[2]	0.6
Inventories		(28.2)		10.1	[2]	(40.6)
Accounts payable, trade and other		20.9		(39.8)	[2]	10.8
Income taxes		3.0		(0.9)	[2]	(0.7)
Change in due to related party		0.0		0.0	[2]	(23.7)
Change in prepaid and other current assets and other assets		(3.7)		(9.9)	[2]	(2.7)
Change in accrued and other current and long-term liabilities		3.1		18.4	[2]	(14.6)
Cash provided by operating activities		26.4		6.3	[2]	58.1
Cash used in investing activities:
Capital expenditures	[3]	(131.9)		(124.0)	[2]	(184.3)
Investments in Livent NQSP securities		(1.4)		(0.6)	[2]	(0.4)
Proceeds from settlement of long-term supply agreement		0.0		10.0	[2]	0.0
Investments in unconsolidated affiliate		(8.0)		(15.0)	[2]	(0.8)
Other investing activities		(2.0)		(1.5)	[2]	(4.5)
Cash used in investing activities		(143.3)		(131.1)	[2]	(190.0)
Cash provided by financing activities:
Proceeds from Revolving Credit Facility		39.5		175.5	[2]	232.0
Repayments of Revolving Credit Facility		(75.1)		(294.6)	[2]	(111.4)
Proceeds from 2025 Notes		0.0		245.8	[2]	0.0
Payments of financing fees		0.0		(8.4)	[2]	(0.1)
Proceeds from issuance of common stock - incentive plans		1.5		0.8	[2]	0.0
Payments of underwriting fees and expenses - Offering		(9.4)		0.0	[2]	0.0
Proceeds from Offering		261.6		0.0	[2]	0.0
Net purchases of treasury stock - Livent NQSP		(0.1)		0.0	[2]	0.0
Cash provided by financing activities		218.0		119.1	[2]	120.5
Effect of exchange rate changes on cash and cash equivalents		0.3		0.5	[2]	(0.1)
Increase/(decrease) in cash and cash equivalents		101.4		(5.2)	[2]	(11.5)
Cash and cash equivalents, beginning of period		11.6	[2]	16.8	[2]	28.3
Cash and cash equivalents, end of period		113.0		11.6	[2]	16.8	[2]
Supplemental disclosure for cash flow:
Income taxes paid, net of refunds	[4]	4.1		2.6		38.5
Cash payments for interest, net	[3]	13.3		5.6		4.3
Cash payments for Restructuring and other charges		5.3		7.4		4.1
Cash (receipts)/payments for Separation-related charges	[5]	2.0		(0.8)		9.9
Accrued capital expenditures		32.5		15.1		34.0
Operating lease right-of-use assets and lease liabilities recorded for ASC 842		2.1		0.8		16.1
Accrued investment in unconsolidated affiliate		$ 0.0		$ 6.3		$ 0.0

[1] As adjusted for the adoption of ASU 2020-06 using the full retrospective method.

[2] As adjusted for the adoption of ASU 2020-06 using the full retrospective method.

[3] For the year ended December 31, 2021 and December 31, 2020 $15.4 million and $12.0 million of interest was capitalized, respectively. All of the interest related to our Revolving Credit Facility was capitalized for the year ended December 31, 2019.

[4] The year ended December 31, 2021 includes $1.7 million of refunds relating to U.S. state taxes and foreign taxes. The year ended December 31, 2020 includes refunds of $1.6 million and $1.9 million from FMC related to the Company's 2019 and 2018 federal income tax returns, respectively.

[5] The year ended December 31, 2020 includes $2.0 million gain on settlement of long-term supply agreement. The year ended December 31, 2019 includes $4.6 million paid to FMC related to the Separation steps.