Luxfer (LXFR) 10-Q 25 Oct 21 2021 Q3 Quarterly report Financial data

Cover

Cover	9 Months Ended
	Sep. 26, 2021shares
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 26, 2021
Document Transition Report	false
Entity File Number	001-35370
Entity Registrant Name	Luxfer Holdings PLC
Entity Incorporation, State or Country Code	X0
Entity Tax Identification Number	98-1024030
Entity Address, Address Line One	Lumns Lane
Entity Address, City or Town	Manchester
Entity Address, Postal Zip Code	M27 8LN
Country Region	+1
City Area Code	414
Local Phone Number	269-2419
Title of 12(b) Security	Ordinary Shares, nominal value £0.50 each
Trading Symbol	LXFR
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding	27,704,918
Entity Central Index Key	0001096056
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Address, Country	GB

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020
Income Statement [Abstract]
Net sales		$ 91.2	$ 77.7	$ 275.4	$ 242.7
Cost of goods sold		(70.1)	(58.8)	(203.2)	(181.7)
Gross profit		21.1	18.9	72.2	61
Selling, general and administrative expenses		(10.6)	(8.4)	(33.9)	(30.3)
Research and development		(1.3)	(1)	(2.9)	(2.6)
Restructuring charges		(0.5)	(4.2)	(2.1)	(7.8)
Acquisition and disposal related costs		(0.6)	0	(1.5)	(0.2)
Other charges		0	0	(1.1)	0
Operating income		8.1	5.3	30.7	20.1
Interest expense		(0.8)	(1.2)	(2.4)	(3.5)
Defined benefit pension credit		0.6	1.1	1.8	3.3
Income before income taxes and equity in net loss from affiliates		7.9	5.2	30.1	19.9
Provision for income taxes		(1.9)	(2.8)	(3.6)	(5.6)
Income before equity in net loss from affiliates		6	2.4	26.5	14.3
Equity in net loss from affiliates (net of tax)		0	0	0	(0.1)
Net income from continuing operations		6	2.4	26.5	14.2
(Loss) / income from discontinued operations, net of tax		(0.7)	0.2	(2.8)	(1.3)
(Loss) / gain on disposition of discontinued operations, net of tax		(0.5)	0	6.6	0
Net (loss) / income from discontinued operations		(1.2)	0.2	3.8	(1.3)
Net income		$ 4.8	$ 2.6	$ 30.3	$ 12.9
Earnings / (loss) per share
Basic from continuing operations (usd per share)	[1]	$ 0.22	$ 0.09	$ 0.96	$ 0.52
Basic from discontinued operations (usd per share)	[1],[2]	(0.04)	0.01	0.14	(0.05)
Basic (usd per share)	[1]	0.17	0.09	1.09	0.47
Diluted from continuing operations (usd per share)		0.21	0.09	0.94	0.51
Diluted from discontinued operations (usd per share)	[2]	(0.04)	0.01	0.14	(0.05)
Diluted (usd per share)		$ 0.17	$ 0.09	$ 1.08	$ 0.46
Weighted average ordinary shares outstanding
Basic (in shares)		27,722,472	27,619,298	27,718,874	27,532,823
Diluted (in shares)		28,033,732	28,013,706	28,072,155	27,958,942
[1]	The calculation of earnings per share is performed separately for continuing and discontinued operations. As a result, the sum of the two in any particular period may not equal the earnings-per-share amount in total.
[2]	The loss per share for discontinued operations in the Third Quarter of 2021 and the year-to-date of 2020 has not been diluted, since the incremental shares included in the weighted-average number of shares outstanding would have been anti-dilutive.

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 4.8	$ 2.6	$ 30.3	$ 12.9
Other comprehensive (loss) / income
Change in foreign currency translation adjustment, net of tax	(2.1)	3	(0.1)	(3.7)
Pension and post-retirement actuarial gains, net of $0.2, $0.1, $0.5 and $0.3 tax, respectively	0.7	0.5	2.1	1.4
Other comprehensive (loss) / income, net of tax	(1.4)	3.5	2	(2.3)
Total comprehensive income	$ 3.4	$ 6.1	$ 32.3	$ 10.6

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020
Statement of Comprehensive Income [Abstract]
Pension and post-retirement actuarial gains, tax	$ 0.2	$ 0.1	$ 0.5	$ 0.3

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Millions	Sep. 26, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 15.1	$ 1.5
Restricted cash	0.1	0
Accounts and other receivables, net of allowances of $0.6 and $0.5, respectively	59	43.1
Inventories	80.6	68.8
Current assets held-for-sale	10.5	36
Other current assets	1.3	1.5
Total current assets	166.6	150.9
Non-current assets
Property, plant and equipment, net	88.5	86
Right-of-use assets from operating leases	11.7	9.5
Goodwill	72.9	70.2
Intangibles, net	12.2	12.8
Deferred tax assets	18	16.5
Investments in joint ventures and other affiliates	0.4	0.5
Total assets	370.3	346.4
Current liabilities
Accounts payable	30.7	18.6
Accrued liabilities	30.1	21.5
Taxes on income	3.6	0.4
Current liabilities held-for-sale	1.7	11.4
Other current liabilities	12.9	13.5
Total current liabilities	79	65.4
Non-current liabilities
Long-term debt	49.6	53.4
Pensions and other retirement benefits	42.4	50.8
Deferred tax liabilities	1.3	2
Other non-current liabilities	11.3	7.7
Total liabilities	183.6	179.3
Shareholders' equity
Additional paid-in capital	69.5	70.6
Treasury shares	(5.5)	(4)
Own shares held by ESOP	(1.2)	(1.4)
Retained earnings	111.3	91.2
Accumulated other comprehensive loss	(163.8)	(165.8)
Total shareholders' equity	186.7	167.1
Total liabilities and shareholders' equity	370.3	346.4
Ordinary shares
Shareholders' equity
Common stock	26.5	26.6
Deferred shares
Shareholders' equity
Common stock	$ 149.9	$ 149.9

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) $ in Millions	Sep. 26, 2021USD ($)shares	Sep. 26, 2021£ / shares	Dec. 31, 2020USD ($)shares	Dec. 31, 2020£ / shares
Accounts and other receivables, net of allowance | $	$ 0.6		$ 0.5
Ordinary shares
Common stock, par value (in GBP per share) | £ / shares		£ 0.50		£ 0.50
Common stock, shares authorized (in shares)	40,000,000		40,000,000
Common stock, shares issued (in shares)	28,944,000		29,000,000
Common stock, shares outstanding (in shares)	28,944,000		29,000,000
Deferred shares
Common stock, par value (in GBP per share) | £ / shares		£ 0.0001		£ 0.0001
Common stock, shares authorized (in shares)	761,835,338,444		761,835,338,444
Common stock, shares issued (in shares)	761,835,338,444		761,835,338,444
Common stock, shares outstanding (in shares)	761,835,338,444		761,835,338,444

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020
Operating activities
Net income	$ 30.3	$ 12.9
Net (income) / loss from discontinued operations	(3.8)	1.3
Net income from continuing operations	26.5	14.2
Adjustments to reconcile net income to net cash provided by operating activities
Equity in net loss from affiliates	0	0.1
Depreciation	10.5	9.4
Amortization of purchased intangible assets	0.7	0.6
Amortization of debt issuance costs	0.3	0.4
Share-based compensation charges	2.2	2.1
Deferred income taxes	(2.2)	0.4
Defined benefit pension credit	(1.8)	(3.3)
Defined benefit pension contributions	(4.6)	(2.7)
Changes in assets and liabilities
Accounts and other receivables	(10.2)	4.8
Inventories	(5.4)	3.7
Other current assets	(1.2)	10.7
Accounts payable	9.6	(9.5)
Accrued liabilities	8.6	2.7
Other current liabilities	(0.3)	2.6
Other non-current assets and liabilities	1.4	0.3
Net cash provided by operating activities - continuing	34.1	36.5
Net cash provided by operating activities - discontinued	0	0.2
Net cash provided by operating activities	34.1	36.7
Investing activities
Capital expenditures	(5.6)	(5.8)
Proceeds from sale of businesses and other	23.7	1.3
Acquisitions	19.3	0
Net cash used for investing activities - continuing	(1.2)	(4.5)
Net cash used for investing activities - discontinued	0	(0.2)
Net cash used for investing activities	(1.2)	(4.7)
Financing activities
Net repayment of long-term borrowings	(4.4)	(16.5)
Deferred consideration paid	0	(0.4)
Proceeds from sale of shares	0	1.1
Repurchase of own shares	(2.8)	0
Share-based compensation cash paid	(1.9)	(1.3)
Dividends paid	(10.2)	(10.2)
Net cash used for financing activities	(19.3)	(27.3)
Effect of exchange rate changes on cash and cash equivalents	0.1	(0.1)
Net increase	13.7	4.6
Cash, cash equivalents and restricted cash; beginning of year	1.5	10.3
Cash, cash equivalents and restricted cash; end of the Third Quarter	15.2	14.9
Supplemental cash flow information:
Interest payments	2.5	3.5
Income tax payments	$ 5.2	$ 1.6

CONDENSED CONSOLIDATED STATEM_5

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (UNAUDITED) - USD ($) $ in Millions	Total	Additional paid-in capital	Treasury shares	Own shares held by ESOP	Retained earnings	Accumulated other comprehensive loss	Ordinary sharesCommon stock	Deferred sharesCommon stock
Beginning balance at Dec. 31, 2019	$ 174.4	$ 68.4	$ (4)	$ (1.7)	$ 84.8	$ (149.6)	$ 26.6	$ 149.9
Beginning balance (in shares) at Dec. 31, 2019			(400,000)	(1,200,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6.2				6.2
Shares sold from ESOP	0
Other comprehensive income (loss), net of tax	(7.3)					(7.3)
Dividends declared	(3.4)				(3.4)
Share-based compensation	0.5	0.5
Utilization of treasury shares to satisfy share based compensation	(0.6)	(0.7)		$ 0.1
Utilization of treasury shares to satisfy share based compensation (in shares)				100,000
Ending balance at Mar. 29, 2020	169.8	68.2	$ (4)	$ (1.6)	87.6	(156.9)	26.6	149.9
Ending balance (in shares) at Mar. 29, 2020			(400,000)	(1,100,000)
Beginning balance at Dec. 31, 2019	174.4	68.4	$ (4)	$ (1.7)	84.8	(149.6)	26.6	149.9
Beginning balance (in shares) at Dec. 31, 2019			(400,000)	(1,200,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	12.9
Other comprehensive income (loss), net of tax	(2.3)
Ending balance at Sep. 27, 2020	176.7	70.1	$ (4)	$ (1.5)	87.5	(151.9)	26.6	149.9
Ending balance (in shares) at Sep. 27, 2020			(400,000)	(1,000,000)
Beginning balance at Mar. 29, 2020	169.8	68.2	$ (4)	$ (1.6)	87.6	(156.9)	26.6	149.9
Beginning balance (in shares) at Mar. 29, 2020			(400,000)	(1,100,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	4.1				4.1
Shares sold from ESOP	0.9	0.9
Other comprehensive income (loss), net of tax	1.5					1.5
Dividends declared	(3.4)				(3.4)
Share-based compensation	0.8	0.8
Utilization of shares from ESOP to satisfy share based compensation	(0.4)	(0.5)		$ 0.1
Utilization of shares from ESOP to satisfy share based compensation (in shares)				100,000
Ending balance at Jun. 28, 2020	173.3	69.4	$ (4)	$ (1.5)	88.3	(155.4)	26.6	149.9
Ending balance (in shares) at Jun. 28, 2020			(400,000)	(1,000,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2.6				2.6
Other comprehensive income (loss), net of tax	3.5					3.5
Dividends declared	(3.4)				(3.4)
Share-based compensation	0.8	0.8
Utilization of shares from ESOP to satisfy share based compensation	(0.1)	(0.1)
Ending balance at Sep. 27, 2020	176.7	70.1	$ (4)	$ (1.5)	87.5	(151.9)	26.6	149.9
Ending balance (in shares) at Sep. 27, 2020			(400,000)	(1,000,000)
Beginning balance at Dec. 31, 2020	167.1	70.6	$ (4)	$ (1.4)	91.2	(165.8)	26.6	149.9
Beginning balance (in shares) at Dec. 31, 2020			(400,000)	(1,000,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	14.5				14.5
Other comprehensive income (loss), net of tax	1.5					1.5
Dividends declared	(3.4)				(3.4)
Share-based compensation	0.5	0.5
Utilization of shares from ESOP to satisfy share based compensation	(1.3)	(1.4)		$ 0.1
Utilization of shares from ESOP to satisfy share based compensation (in shares)				100,000
Ending balance at Mar. 28, 2021	178.9	69.7	$ (4)	$ (1.3)	102.3	(164.3)	26.6	149.9
Ending balance (in shares) at Mar. 28, 2021			(400,000)	(900,000)
Beginning balance at Dec. 31, 2020	167.1	70.6	$ (4)	$ (1.4)	91.2	(165.8)	26.6	149.9
Beginning balance (in shares) at Dec. 31, 2020			(400,000)	(1,000,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	30.3
Other comprehensive income (loss), net of tax	$ 2
Purchase of own shares (in shares)	(126,734)
Purchase of own shares	$ (2.8)
Ending balance at Sep. 26, 2021	186.7	69.5	$ (5.5)	$ (1.2)	111.3	(163.8)	26.5	149.9
Ending balance (in shares) at Sep. 26, 2021			(500,000)	(800,000)
Beginning balance at Mar. 28, 2021	178.9	69.7	$ (4)	$ (1.3)	102.3	(164.3)	26.6	149.9
Beginning balance (in shares) at Mar. 28, 2021			(400,000)	(900,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	11				11
Other comprehensive income (loss), net of tax	1.9					1.9
Dividends declared	(3.4)				(3.4)
Share-based compensation	0.9	0.9
Utilization of shares from ESOP to satisfy share based compensation	(0.2)	(0.3)		$ 0.1
Utilization of shares from ESOP to satisfy share based compensation (in shares)				100,000
Cancellation of ordinary share capital	(0.9)	(0.8)					(0.1)
Ending balance at Jun. 27, 2021	188.2	69.5	$ (4)	$ (1.2)	109.9	(162.4)	26.5	149.9
Ending balance (in shares) at Jun. 27, 2021			(400,000)	(800,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	4.8				4.8
Shares sold from ESOP	(0.1)	(0.1)
Other comprehensive income (loss), net of tax	(1.4)					(1.4)
Dividends declared	(3.4)				(3.4)
Share-based compensation	0.8	0.8
Utilization of shares from ESOP to satisfy share based compensation	$ (0.3)	(0.3)
Purchase of own shares (in shares)	(88,734)		(100,000)
Purchase of own shares	$ (1.5)		$ (1.5)
Cancellation of ordinary share capital	(0.4)	(0.4)
Ending balance at Sep. 26, 2021	$ 186.7	$ 69.5	$ (5.5)	$ (1.2)	$ 111.3	$ (163.8)	$ 26.5	$ 149.9
Ending balance (in shares) at Sep. 26, 2021			(500,000)	(800,000)

CONDENSED CONSOLIDATED STATEM_6

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (UNAUDITED) (Parenthetical) - shares	Sep. 26, 2021	Jun. 27, 2021	Mar. 28, 2021	Dec. 31, 2020	Sep. 27, 2020
Ordinary shares
Common stock, shares outstanding (in shares)	28,944,000	28,962,000	29,000,000	29,000,000	29,000,000
Deferred shares
Common stock, shares outstanding (in shares)	761,835,338,444			761,835,338,444	761,835,338,444

Basis of Presentation and Respo

Basis of Presentation and Responsibility for interim Financial Statements	9 Months Ended
	Sep. 26, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Responsibility for interim Financial Statements	Basis of Presentation and Responsibility for Interim Financial Statements We prepared the accompanying unaudited consolidated condensed financial statements of Luxfer Holdings PLC and all wholly-owned, majority owned or otherwise controlled subsidiaries on the same basis as our annual audited financial statements. We condensed or omitted certain information and footnote disclosures normally included in our annual audited financial statements, which we prepared in accordance with U.S. Generally Accepted Accounting Principles (GAAP). Our quarterly financial statements should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2020. As used in this report, the terms "we," "us," "our," "Luxfer" and "the Company" mean Luxfer Holdings PLC and its subsidiaries, unless the context indicates another meaning. In the opinion of management, our financial statements reflect all adjustments, which are of a normal recurring nature, necessary for presentation of financial statements for interim periods in accordance with U.S. GAAP and with the instructions to Form 10-Q in Article 10 of Securities and Exchange Commission (SEC) Regulation S-X. The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions about future events that affect the reported amounts of assets and liabilities, the disclosure of contingent liabilities at the date of our financial statements and the reported amounts of revenue and expenses during the reporting periods. Actual results could differ from those estimates, and any such differences may be material to our financial statements. Our fiscal year ends on December 31. We report our interim quarterly periods on a 13-week quarter basis, ending on a Sunday. The Third Quarter 2021, ended on September 26, 2021, and the Third Quarter 2020, ended on September 27, 2020. Discontinued operations Certain amounts in the prior-year financial statements were reclassified to conform to the current-year presentation due to the classification of certain businesses as discontinued operations. Impact of COVID-19 on the Financial Statements In March 2020, the World Health Organization characterized the coronavirus ("COVID-19") a pandemic. The rapid spread of the pandemic and the continuously evolving responses to combat it have had an increasingly negative impact on the global economy. Luxfer’s 2020 results were significantly affected by the global macro environment resulting from the COVID-19 pandemic, including broad-based market weakness, which was especially evident in our general industrial and transportation end-markets, contributing to a full year decline of 18.0% and 14.7% respectively, in each of those markets. In the first nine months of 2021, with net sales up 13.5%, a return to growth across all end-markets and adjusted EBITDA up 21.7% on the prior year, the Company has delivered three quarters of strong performance amid the global economic recovery from the COVID-19 pandemic. Furthermore, it continues to operate all of its facilities at near normal production levels, following temporary closures of a few locations in the second and third quarters of 2020. Due to weaker demand resulting from uncertain economic conditions, supply constraints, and the impact of COVID-19, Luxfer implemented additional cost saving programs in the second half of 2020, including headcount reductions. Company performance is now much improved and the apparent success of vaccine programs in the U.S. and Europe has given rise to fewer restrictions, increased stability and macroeconomic recovery. That said, the coronavirus is still prevalent in many of our markets, there are pressures on availability and therefore cost of, raw materials, transport, energy and labor, continuing restrictions on international travel resulting in considerable uncertainty as to when normal conditions will prevail. If warranted, it is possible that the Company may again suspend or reduce operations at certain facilities, which could have an adverse effect on our financial position, results of operations and cash flows. The Company recognized that the COVID-19 pandemic constituted a triggering event in accordance with Accounting Standards Codification, ("ASC"), 350 Intangibles - Goodwill and Other, during the first quarter of 2020 and therefore performed an impairment assessment of its goodwill and other intangible assets. Based on the forecast at that time, we did not identify any impairments, nor marginal outcomes. During 2020 and in the first nine months of 2021, quarterly re-forecasts were performed to assess the impact COVID-19 was having on our results and liquidity, and in the fourth quarter of 2020 we carried out our annual goodwill and other intangibles impairment test using cash flows from the annual and strategic plan budgeting exercise. 1. Basis of Presentation and Responsibility for interim Financial Statements (continued) There have been no subsequent triggering events that has changed our assessment of fair value, as a result, no impairments nor marginal outcomes have been identified. Assumptions and judgments are required in calculating the fair value of the reporting units. In developing our discounted cash flow analysis, assumptions about future revenues and expenses, capital expenditures and changes in working capital are based on our annual operating plan and long-term business plan for each of our reporting units. These plans take into consideration numerous factors including historical experience, anticipated future economic conditions, changes in raw material prices and growth expectations for the industries and end markets we participate in. These assumptions and judgments may change as we learn more about the impact of the COVID-19 pandemic. In relation to liquidity, the Company has access to a revolving credit facility (see Note 9) and has performed stress testing on financial covenants using current forecast information and has not identified any liquidity concerns. Furthermore, the Company has reported historically low levels of net debt and continual strong cash flow generation since the onset of the pandemic. Accounting standards issued but not yet effective None that will be material to the Company.

Earnings per share

Earnings per share	9 Months Ended
	Sep. 26, 2021
Earnings Per Share [Abstract]
Earnings per share	Earnings per share Basic earnings per share are computed by dividing net income or loss for the period by the weighted-average number of ordinary shares outstanding, net of treasury shares and shares held in ESOP. Diluted earnings per share are computed by dividing net income for the period by the weighted average number of ordinary shares outstanding and the dilutive ordinary shares equivalents. Basic and diluted earnings per share were calculated as follows: Third Quarter Year-to-date In millions except share and per-share data 2021 2020 2021 2020 Basic earnings: Net income from continuing operations $ 6.0 $ 2.4 $ 26.5 $ 14.2 Net (loss) / income from discontinued operations (1.2) 0.2 3.8 (1.3) Net income $ 4.8 $ 2.6 $ 30.3 $ 12.9 Weighted average number of £0.50 ordinary shares: For basic earnings per share 27,722,472 27,619,298 27,718,874 27,532,823 Dilutive effect of potential common stock 311,260 394,408 353,281 426,119 For diluted earnings per share 28,033,732 28,013,706 28,072,155 27,958,942 Earnings / (loss) per share using weighted average number of ordinary shares outstanding 3 : Basic earnings per ordinary share for continuing operations $ 0.22 $ 0.09 $ 0.96 $ 0.52 Basic (loss) / earnings per ordinary share for discontinued operations (0.04) 0.01 0.14 (0.05) Basic earnings per ordinary share $ 0.17 $ 0.09 $ 1.09 $ 0.47 Diluted earnings per ordinary share for continuing operations $ 0.21 $ 0.09 $ 0.94 $ 0.51 Diluted (loss) / earnings per ordinary share for discontinued operations (0.04) 0.01 0.14 (0.05) Diluted earnings per ordinary share $ 0.17 $ 0.09 $ 1.08 $ 0.46 3 The calculation of earnings per share is performed separately for continuing and discontinued operations. As a result, the sum of the two in any particular period may not equal the earnings-per-share amount in total In the third quarter of 2021 and year-to-date 2020, basic average shares outstanding and diluted average shares outstanding were the same for discontinued operations because the effect of potential shares of common stock was anti-dilutive since the Company generated a net loss from discontinued operations. .

Net Sales

Net Sales	9 Months Ended
	Sep. 26, 2021
Revenue from Contract with Customer [Abstract]
Net Sales	Net Sales Disaggregated sales disclosures for the quarter and first nine months ended September 26, 2021, and September 27, 2020, are included below and in Note 14, Segmental Information. Third Quarter 2021 2020 In millions Gas Cylinders Elektron Total Gas Cylinders Elektron Total General industrial $ 7.6 $ 21.6 $ 29.2 $ 6.8 $ 20.0 $ 26.8 Transportation 19.7 11.4 31.1 11.9 9.9 21.8 Defense, First Response & Healthcare 18.3 12.6 30.9 13.6 15.5 29.1 Net sales $ 45.6 $ 45.6 $ 91.2 $ 32.3 $ 45.4 $ 77.7 Year-to-date 2021 2020 In millions Gas Cylinders Elektron Total Gas Cylinders Elektron Total General industrial $ 23.3 $ 69.0 $ 92.3 $ 19.6 $ 65.6 $ 85.2 Transportation 50.7 35.1 85.8 37.3 29.7 67.0 Defense, First Response & Healthcare 54.3 43.0 97.3 50.1 40.4 90.5 Net sales $ 128.3 $ 147.1 $ 275.4 $ 107.0 $ 135.7 $ 242.7

Restructuring

Restructuring	9 Months Ended
	Sep. 26, 2021
Restructuring and Related Activities [Abstract]
Restructuring	Restructuring The $0.5 million and $2.1 million restructuring charge in the third quarter and first nine months of 2021, respectively, included $0.3 million and $1.0 million, respectively, of further costs associated with the announced closure of Luxfer Gas Cylinders France, and was largely legal and professional fees. The nine months of 2021 also includes $0.9 million of one-time employee termination costs in the Elektron division, largely in relation to the divestiture of our small Luxfer Magtech production facility in Ontario, Canada in the second quarter of 2021. The $4.2 million and $7.8 million restructuring charge in the third quarter and first nine months of 2020, respectively, was predominantly ($3.3 million and $6.5 million, respectively) the result of further costs associated with the announced closure of Luxfer Gas Cylinders France, including one-time employee costs and associated legal and professional fees. In addition we incurred one-time employee costs in relation to COVID-led cost saving programs largely affecting our Elektron Division, of $0.9 million and $1.3 million in the third quarter and first nine months of 2020, respectively. Restructuring-related costs included within Restructuring charges in the Condensed Consolidated Financial Statements by reportable segment were as follows: Third Quarter Year-to-date In millions 2021 2020 2021 2020 Severance and related costs Gas Cylinders $ 0.5 $ 3.3 $ 1.1 $ 6.7 Elektron — 0.9 1.0 1.0 Other — — — 0.1 Total restructuring charges $ 0.5 $ 4.2 $ 2.1 $ 7.8 4. Restructuring Activity related to restructuring, recorded in Other current liabilities in the consolidated balance sheets is summarized as follows: In millions 2021 Balance at January 1, $ 9.0 Costs incurred 2.1 Cash payments and other (2.5) Balance at September 26, $ 8.6

Acquisition and disposal relate

Acquisition and disposal related costs	9 Months Ended
	Sep. 26, 2021
Business Combinations [Abstract]
Acquisition and disposal related costs	Acquisition and disposal related costs On March 15, 2021 the Company completed the acquisition of the Structural Composites Industries LLC (SCI) business of Worthington Industries, Inc., based in Pomona, California, for $19.3 million cash consideration. The acquisition of SCI strengthens Luxfer’s composite cylinder offerings and aligns with recent investment to enhance our alternative fuel capabilities to capitalize on the growing compressed natural gas (CNG) and hydrogen opportunities. At the Third Quarter of 2021 the purchase price allocation was ongoing and therefore a provisional allocation was presented. During the ongoing review of the purchase price allocation in the Third Quarter there has been a reallocation of $0.2 million from inventories to goodwill. No other changes in the purchase price allocation presented at the Second Quarter of 2021 have been identified, although the review remains ongoing. Acquisition-related costs of $0.6 million and $1.5 million incurred in the third quarter and first nine months of 2021 respectively, primarily represent transitional costs and professional fees incurred in relation to the SCI acquisition. Acquisition-related costs of $0.2 million in the first nine months of 2020 related to M&A exploration activities net of a $0.1 million release of deferred contingent consideration. In the Third Quarter of 2020 we sold our 51% investment in Luxfer Uttam India Private Limited to our joint venture partner resulting in a gain on sale of less than $0.1 million.

Other charges

Other charges	9 Months Ended
	Sep. 26, 2021
Other Income and Expenses [Abstract]
Other charges	Other chargesOther charges of $1.1 million in the first nine months of 2021 relates to the settlement of a class action lawsuit in the Gas Cylinders segment in relation to an alleged historic violation of the Californian Labor Code, concerning a Human Resources administration matter. The Company expects the cash related to the settlement to be paid during the year, with no additional charge to the income statement.

Supplementary balance sheet inf

Supplementary balance sheet information	9 Months Ended
	Sep. 26, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Supplementary balance sheet information	Supplementary balance sheet information September 26, December 31, In millions 2021 2020 Accounts and other receivables Trade receivables $ 50.0 $ 33.6 Related parties 0.2 0.2 Prepayments and accrued income 6.5 5.5 Derivative financial instruments 0.1 0.2 Deferred consideration 0.9 0.2 Other receivables 1.3 3.4 Total accounts and other receivables $ 59.0 $ 43.1 Inventories Raw materials and supplies $ 36.2 $ 26.2 Work-in-process 23.7 19.7 Finished goods 20.7 22.9 Total inventories $ 80.6 $ 68.8 Other current assets Income tax receivable 1.3 1.5 Total other current assets $ 1.3 $ 1.5 Property, plant and equipment, net Land, buildings and leasehold improvements $ 67.0 $ 65.2 Machinery and equipment 265.6 255.3 Construction in progress 6.5 7.8 Total property, plant and equipment 339.1 328.3 Accumulated depreciation and impairment (250.6) (242.3) Total property, plant and equipment, net $ 88.5 $ 86.0 Other current liabilities Restructuring related liabilities $ 8.6 $ 9.0 Contingent liabilities 1.5 1.1 Derivative financial instruments 0.1 0.4 Operating lease liability 1.1 2.9 Other current liabilities 1.6 0.1 Total other current liabilities $ 12.9 $ 13.5 Other non-current liabilities Contingent liabilities $ 0.6 $ 1.0 Operating lease liability 10.7 6.7 Total other non-current liabilities $ 11.3 $ 7.7 7. Supplementary balance sheet information (continued) In 2020, the Company classified its Superform aluminum superplastic forming business operating from sites in the U.S. and the U.K, and our U.S. aluminum gas cylinder business, as assets and liabilities held-for-sale in accordance with ASC 205-20 Discontinued Operations. See Note 10 for a breakdown of this disposal group. Our U.S. aluminum gas cylinder business was sold during the First Quarter of 2021 and our U.K. Superform business was sold during the Third Quarter of 2021. The respective assets and liabilities of the above disposal group have been reclassified as held-for-sale also included within assets held-for-sale, but not disclosed as discontinued operations, in 2021 and 2020 is one building valued at $3.7 million, within our Elektron Segment. Both of these respective items have been included in the table below. Held-for-sale assets September 26, December 31, In millions 2021 2020 Property, plant and equipment $ 4.8 $ 11.6 Right-of-use-assets from operating leases 0.4 3.1 Inventory 2.7 12.6 Accounts and other receivables 2.6 8.7 Held-for-sale assets $ 10.5 $ 36.0 Held-for-sale liabilities Accounts payable 0.6 4.3 Accrued liabilities 0.1 1.5 Other current liabilities 1.0 5.6 Held-for-sale liabilities $ 1.7 $ 11.4 There has been no reclassification of items from other comprehensive income to the income statement as a result of items reclassified to held-for-sale.

Goodwill and other identifiable

Goodwill and other identifiable intangible assets	9 Months Ended
	Sep. 26, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and other identifiable intangible assets	Goodwill and other identifiable intangible assets Changes in goodwill during the first nine months ended September 26, 2021, were as follows: In millions Gas Cylinders Elektron Total At January 1, 2021 $ 27.9 $ 42.3 $ 70.2 Additions 2.6 — 2.6 Exchange difference 0.1 — 0.1 Net balance at September 26, 2021 $ 30.6 $ 42.3 $ 72.9 Identifiable intangible assets consisted of the following: September 26, 2021 December 31, 2020 In millions Gross Accumulated amortization Net Gross Accumulated amortization Net Customer relationships $ 13.4 $ (5.5) $ 7.9 $ 13.4 $ (5.2) $ 8.2 Technology and trading related 8.3 (4.0) 4.3 8.3 (3.7) 4.6 $ 21.7 $ (9.5) $ 12.2 $ 21.7 $ (8.9) $ 12.8 Identifiable intangible asset amortization expense was $0.7 million and $0.6 million for the first nine months of 2021 and 2020, respectively. Intangible asset amortization expense during the remainder of 2021 and over the next five years is expected to be approximately $0.2 million in 2021, $0.9 million in 2022, $0.9 million in 2023, $0.9 million in 2024, $0.9 million in 2025 and $0.9 million in 2026.

Debt

Debt	9 Months Ended
	Sep. 26, 2021
Debt Disclosure [Abstract]
Debt	Debt Debt outstanding was as follows: In millions September 26, 2021 December 31, 2020 4.88% Loan Notes due 2023 $ 25.0 $ 25.0 4.94% Loan Notes due 2026 25.0 25.0 Revolving credit facility — 4.1 Unamortized debt issuance costs (0.4) (0.7) Total debt $ 49.6 $ 53.4 Less current portion $ — $ — Non-current debt $ 49.6 $ 53.4 The weighted-average interest rate on the revolving credit facility was 1.63% for the first nine months of 2021 and 2.19% for the full-year 2020. The maturity profile of the Company's debt, excluding unamortized issuance costs and discounts, is as follows: In millions 2021 2022 2023 2024 2025 Thereafter Total Loan Notes due 2023 $ — $ — $ 25.0 $ — $ — $ — $ 25.0 Loan Notes due 2026 — — — — — 25.0 25.0 Total debt $ — $ — $ 25.0 $ — $ — $ 25.0 $ 50.0 Loan notes due and shelf facility We have been in compliance with the covenants under the Note Purchase and Private Shelf Agreement throughout all of the quarterly measurement dates from and including September 30, 2014, to September 26, 2021. The Loan Notes due 2023 and 2026, the Shelf Facility and the Note Purchase and Private Shelf Agreement are governed by the law of the State of New York. Senior Facilities Agreement The balance outstanding on the revolving credit facility at September 26, 2021, was nil, and at December 31, 2020, was $4.1 million, with $100.0 million undrawn at September 26, 2021 and $145.9 million undrawn at December 31, 2020. During the second quarter of 2021 we reduced our Revolving credit facility to $100.0 million, from $150.0 million. The current banking facilities are due to expire July 31, 2022, however, a new facility is expected to be signed on October 26, 2021. See Note 16 for additional information. We have been in compliance with the covenants under the Senior Facilities Agreement throughout all of the quarterly measurement dates from and including September 30, 2011, to September 26, 2021.

Discontinued Operations

Discontinued Operations	9 Months Ended
	Sep. 26, 2021
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	Discontinued Operations Our Superform aluminum superplastic forming business which operated from sites in the U.S. and the U.K, and our U.S. aluminum gas cylinder business were historically included in the Gas Cylinders segment. As a result of our decision to exit non-strategic aluminum product lines, we have reflected the results of operations of these businesses as discontinued operations in the Condensed Consolidated Statements of Income for all periods presented. Our U.S. aluminum gas cylinder business was sold in March 2021 for $21.0 million. Subsequent to the First Quarter, $0.8 million of working capital adjustments were made, resulting in final proceeds of $20.2 million. In September 2021, our Superform U.K. business was sold for $4.1 million, made up of $3.5 million cash received and $0.6 million of non-contingent, deferred consideration,receivable by September 30, 2022. We expect our Superform U.S business to be sold within the next twelve months. 10. Discontinued Operations (continued) The assets and liabilities of the Superform U.S. business has been presented within Current assets held-for-sale and Current liabilities held-for-sale in the consolidated balance sheets for 2021 and 2020. Our Superform U.K. and U.S. aluminum gas cylinders business, along with our Superform U.S business has been presented within Current assets held-for-sale and Current liabilities held-for-sale in 2020. The Company has determined that the carrying value of the held-for-sale assets is recoverable and as a result no loss allowances have been recognized. Results of discontinued operations were as follows: Third Quarter Year-to-date In millions 2021 2020 2021 2020 Net sales $ 4.9 $ 12.7 $ 19.5 $ 41.0 Cost of goods sold (4.7) (13.3) (20.4) (40.4) Gross profit / (loss) $ 0.2 $ (0.6) $ (0.9) $ 0.6 Selling, general and administrative expenses (1.4) (1.4) (3.1) (4.1) Restructuring charges — (0.1) — (0.1) Other income — 2.3 — 2.3 Operating (loss) / profit $ (1.2) $ 0.2 $ (4.0) $ (1.3) Tax credit 0.5 — 1.2 — Net (loss) / income $ (0.7) $ 0.2 $ (2.8) $ (1.3) The earnings per share for discontinued operations for the first nine months of 2021 and 2020 was $0.14 and a loss of $0.05, respectively. The positive result in 2021 was the result of the $6.6 million gain on disposition of discontinued operations, partially offset by the $2.8 million loss from operations. In the First Quarter of 2021, the Company sold its U.S. aluminum gas cylinders business for $20.2 million, after working capital adjustments, which resulted in a gain on sale of $6.7 million, net of a $2.0 million tax charge which was recognized in the First Quarter of 2021. In the Third Quarter of 2021, the Company recorded a $0.1 million loss on the sale of the Superform U.K business, see below table. There was an additional $0.4 million true up to working capital in relation to the Graham disposal, resulting in a total $0.5 million loss on disposition in the quarter. Third Quarter In millions 2021 Cash consideration received $ 3.5 Deferred consideration payable 0.6 Less Net assets sold (4.2) Gross loss on disposition (0.1) Provision for income taxes — Net loss on disposition $ (0.1) 10. Discontinued Operations (continued) The assets and liabilities classified as held-for-sale related to discontinued operations were as follows: Held-for-sale assets September 26, December 31, In millions 2021 2020 Property, plant and equipment $ 1.1 $ 7.9 Right-of-use-assets from operating leases 0.4 3.1 Inventory 2.7 12.6 Accounts and other receivables 2.6 8.7 Held-for-sale assets $ 6.8 $ 32.3 Held-for-sale liabilities Accounts payable 0.6 4.3 Accrued liabilities 0.1 1.5 Other current liabilities 1.0 5.6 Held-for-sale liabilities $ 1.7 $ 11.4 Also included within assets held-for-sale, but not disclosed as discontinued operations, in 2021 and 2020 is one building valued at $3.7 million, within our Elektron Segment. The depreciation and amortization, capital expenditures and significant non-cash items were as follows: Third Quarter Year-to-date In millions 2021 2020 2021 2020 Cash flows from discontinued operations: Depreciation $ 0.1 $ 0.2 $ 0.4 $ 0.8 Cash balances are swept into the treasury entities at the end of each day, these sweeps are recorded within operating cash flows in the statements of cash flows.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 26, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes We manage our affairs so that we are centrally managed and controlled in the United Kingdom (“U.K.”) and therefore have our tax residency in the U.K. The provision for income taxes consists of provisions for the U.K. and international income taxes. We operate in an international environment with operations in various locations outside the U.K. Accordingly, the consolidated income tax rate is a composite rate reflecting the earnings in the various locations and the applicable rates. The effective income tax rate on continuing operations for the first none-months ended September 26, 2021, was 12.0%, compared to 28.1% for the first ine-months ended September 27, 2020. The 2021 rate has been impacted by a $2.8 million deferred tax credit as a result of the enacted increase in the U.K. tax rate from 19% to 25% from April 2023.

Share Plans

Share Plans	9 Months Ended
	Sep. 26, 2021
Share-based Payment Arrangement [Abstract]
Share Plans	Share Plans Total share-based compensation expense for the quarters ended September 26, 2021, and September 27, 2020, was as follows: Third Quarter Year-to-date In millions 2021 2020 2021 2020 Total share-based compensation charges $ 0.8 $ 0.8 $ 2.2 $ 2.1 In March 2021, we issued our annual share-based compensation grants under the Luxfer Holdings PLC Long-Term Umbrella Incentive Plan. The total number of awards issued was approximately 110,000 and the weighted average fair value of options granted in 2021 was estimated to be $21.14 per share. Also in March 2021, approximately 45,000 awards were granted based on the achievement of total shareholder return targets from the period January 1, 2018 to December 31, 2020. The awards vested immediately upon grant. In June 2021, we issued our annual share-based compensation grants under the Luxfer Holdings PLC Non-Executive Directors' Equity Incentive Plan. The total number of awards issued was 19,184 and the weighted-average fair value of options granted was estimated to be $21.69 per share. The following table illustrates the assumptions used in deriving the fair value of share options granted during 2021 and the year-ended December 31, 2020: 2021 2020 Dividend yield (%) 3.39 - 4.09 3.39 - 4.09 Expected volatility range (%) 36.48 - 56.28 36.48 - 56.28 Risk-free interest rate (%) 0.18 - 0.49 0.18 - 0.49 Expected life of share options range (years) 0.50 - 4.00 0.50 - 4.00 Forfeiture rate 5.00 5.00 Weighted average exercise price ($) $1.00 $1.00 Model used Black-Scholes & Monte-Carlo Black-Scholes & Monte-Carlo The expected life of the share options is based on historical data and current expectations, and is not necessarily indicative of exercise patterns that may occur. The expected volatility reflects the assumption that the historical volatility over a period similar to the life of the options is indicative of future trends, which may not necessarily be the actual outcome.

Shareholders' Equity

Shareholders' Equity	9 Months Ended
	Sep. 26, 2021
Equity [Abstract]
Shareholders' Equity	Shareholders' Equity Dividends paid and proposed Third Quarter Year-to-date In millions 2021 2020 2021 2020 Dividends declared and paid during the year: Interim dividend paid February 5, 2020 ($0.125 per ordinary share) $ — $ — $ — $ 3.4 Interim dividend paid May 6, 2020 ($0.125 per ordinary share) — — — 3.4 Interim dividend paid August 5, 2020 ($0.125 per ordinary share) — 3.4 — 3.4 Interim dividend paid February 4, 2021 ($0.125 per ordinary share) — — 3.4 — Interim dividend paid May 5, 2021 ($0.125 per ordinary share) — — 3.4 — Interim dividend paid August 4, 2021 ($0.125 per ordinary share) 3.4 — 3.4 — $ 3.4 $ 3.4 $ 10.2 $ 10.2 In millions 2021 2020 Dividends declared and paid after the quarter end (not recognized as a liability at the quarter end): Interim dividend declared October 5, and to be paid November 4, 2020 ($0.125 per ordinary share) $ — $ 3.4 Interim dividend declared October 5, and to be paid November 3, 2021 ($0.125 per ordinary share) 3.4 — $ 3.4 $ 3.4 Based on a share buyback program approved by shareholders at the 2021 Annual General Meeting, in the Third Quarter the company purchased 88,734 total shares for $1.9 million; year to date purchases were 126,734 total shares for $2.8 million. Of the 126,734 repurchased in the year, 56,000 have been canceled with the remaining 70,374 retained within Treasury shares.

Segmental Information

Segmental Information	9 Months Ended
	Sep. 26, 2021
Segment Reporting [Abstract]
Segmental Information	Segmental Information We classify our operations into two core business segments, Gas Cylinders and Elektron, based primarily on shared economic characteristics for the nature of the products and services; the nature of the production processes; the type or class of customer for their products and services; the methods used to distribute their products or provide their services; and the nature of the regulatory environment. The Company has four identified business units, which aggregate into the two reportable segments. Luxfer Gas Cylinders forms the Gas Cylinders segment, and Luxfer MEL Technologies, Luxfer Magtech and Luxfer Graphic Arts aggregate into the Elektron segment. The Superform business unit used to aggregate into the Gas Cylinders segment, but is now recognized as discontinued operations. A summary of the operations of the segments is provided below: Gas Cylinders segment Our Gas Cylinders segment manufactures and markets specialized products using composites and aluminum, including pressurized cylinders for use in various applications including self-contained breathing apparatus (SCBA) for firefighters, containment of oxygen and other medical gases for healthcare, alternative fuel vehicles, and general industrial. Elektron segment Our Elektron segment focuses on specialty materials based primarily on magnesium and zirconium, with key product lines including advanced lightweight magnesium alloys with a variety of uses across a variety of industries; magnesium powders for use in countermeasure flares, as well as heater meals; photoengraving plates for graphic arts; and high-performance zirconium-based materials and oxides used as catalysts and in the manufacture of advanced ceramics, and many other performance products. Other Other primarily represents unallocated corporate expense and includes non-service related defined benefit pension cost / credit. Management monitors the operating results of its reportable segments separately for the purpose of making decisions about resource allocation and performance assessment. Segment performance is evaluated by the chief operating decision maker, who is responsible for allocating resources and assessing performance of the operating segments as the CEO, using adjusted EBITA (1) and adjusted EBITDA, which we defined as segment income and are based on operating income adjusted for share based compensation charges; loss on disposal of property, plant and equipment; restructuring charges; impairment charges; acquisition and disposal related gains and costs; other charges; depreciation and amortization; and unwind of the discount on deferred consideration. 1 Adjusted EBITA is adjusted EBITDA less depreciation Unallocated assets and liabilities include those which are held on behalf of the Company and cannot be allocated to a segment, such as taxation, investments, cash, retirement benefits obligations, bank and other loans and holding company assets and liabilities. Financial information by reportable segment for the Third Quarter and year-to-date ended September 26, 2021, and September 27, 2020, is included in the following summary: Net sales Adjusted EBITDA Third Quarter Year-to-date Third Quarter Year-to-date In millions 2021 2020 2021 2020 2021 2020 2021 2020 Gas Cylinders segment $ 45.6 $ 32.3 $ 128.3 $ 107.0 $ 5.4 $ 7.1 $ 16.7 $ 16.6 Elektron segment 45.6 45.4 147.1 135.7 8.4 6.6 32.1 23.5 Consolidated $ 91.2 $ 77.7 $ 275.4 $ 242.7 $ 13.8 $ 13.7 $ 48.8 $ 40.1 Depreciation and amortization (1) Restructuring charges Third Quarter Year-to-date Third Quarter Year-to-date In millions 2021 2020 2021 2020 2021 2020 2021 2020 Gas Cylinders segment $ 1.4 $ 1.0 $ 3.9 $ 2.8 $ 0.5 $ 3.3 $ 1.1 $ 6.7 Elektron segment 2.4 2.4 7.3 7.2 — 0.9 1.0 1.0 Other — — — — — — — 0.1 Consolidated $ 3.8 $ 3.4 $ 11.2 $ 10.0 $ 0.5 $ 4.2 $ 2.1 $ 7.8 (1) Depreciation and amortization includes the expense recognized in relation to assets, and excludes amortization of debt issue costs. 14. Segmental Information (continued) Total assets Capital expenditures September 26, December 31, Third Quarter Year-to-date In millions 2021 2020 2021 2020 2021 2020 Gas Cylinders segment $ 128.3 $ 99.7 $ 0.2 $ 0.7 $ 0.7 $ 1.7 Elektron segment 194.8 189.7 1.8 0.9 4.9 3.4 Other 40.3 24.7 — — — — Discontinued operations 6.9 32.3 — — — — Consolidated $ 370.3 $ 346.4 $ 2.0 $ 1.6 $ 5.6 $ 5.1 Property, plant and equipment, net September 26, December 31, In millions 2021 2020 U.S. $ 47.4 $ 44.3 United Kingdom 36.3 36.6 Canada 3.4 3.7 Rest of Europe 1.1 1.1 Asia Pacific 0.3 0.3 $ 88.5 $ 86.0 The following table presents a reconciliation of Adjusted EBITDA to net income from continuing operations: Third Quarter Year-to-date In millions 2021 2020 2021 2020 Adjusted EBITDA $ 13.8 $ 13.7 $ 48.8 $ 40.1 Other share-based compensation charges (0.8) (0.8) (2.2) (2.1) Depreciation and amortization (3.8) (3.4) (11.2) (10.0) Restructuring charges (0.5) (4.2) (2.1) (7.8) Acquisition and disposal related costs (0.6) — (1.5) (0.2) Other charges — — (1.1) — Defined benefits pension credit 0.6 1.1 1.8 3.3 Interest expense, net (0.8) (1.2) (2.4) (3.5) Provision for income taxes (1.9) (2.8) (3.6) (5.6) Net income from continuing operations $ 6.0 $ 2.4 $ 26.5 $ 14.2 14. Segmental Information (continued) The following tables present certain geographic information by geographic region for the Third Quarter and year-to-date ended September 26, 2021, and September 27, 2020: Net Sales (1) Third Quarter Year-to-date 2021 2020 2021 2020 $M Percent $M Percent $M Percent $M Percent United States $ 49.4 54.2 % $ 41.1 52.9 % $ 151.8 55.1 % $ 132.8 54.8 % U.K. 6.5 7.1 % 4.1 5.3 % 17.5 6.4 % 13.8 5.7 % Germany 5.1 5.6 % 3.1 4.0 % 13.2 4.8 % 11.0 4.5 % France 2.6 2.9 % 4.9 6.3 % 9.3 3.4 % 14.0 5.8 % Italy 3.5 3.8 % 1.9 2.4 % 9.5 3.4 % 8.1 3.3 % Top five countries $ 67.1 73.6 % $ 55.1 70.9 % $ 201.3 73.1 % $ 179.7 74.1 % Rest of Europe 4.9 5.4 % 5.8 7.5 % 19.0 6.9 % 18.1 7.5 % Asia Pacific 13.7 15.0 % 12.1 15.6 % 38.1 13.8 % 32.9 13.5 % Other (2) 5.5 6.0 % 4.7 6.0 % 17.0 6.2 % 12.0 4.9 % $ 91.2 $ 77.7 $ 275.4 $ 242.7 (1) Net sales are based on the geographic destination of sale. (2) Other includes Canada, South America, Central America and Africa.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 26, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Committed and uncommitted banking facilities The Company had committed banking facilities of $100.0 million at September 26, 2021 and $150.0 million at December 31, 2020. Of these committed facilities, nil was drawn at September 26, 2021 and $4.1 million was drawn at December 31, 2020. The current banking facilities are due to expire July 31, 2022, however, a new facility is expected to be signed on October 26, 2021. See Note 16 for additional information. The Company had a separate (uncommitted) facility for letters of credit which at September 26, 2021 was £1.0 million ($1.4 million) and December 31, 2020 was £1.0 million ($1.3 million). None of these were utilized at September 26, 2021 and December 31, 2020, respectively. The Company also has two separate (uncommitted) bonding facilities for bank guarantees, one denominated in GBP sterling of £4.5 million (2021: $6.2 million, 2020: $6.1 million), and one denominated in USD of $1.5 million (2020: $1.5 million). Of that dominated in GBP, £0.6 million ($0.8 million) and £1.0 million ($1.4 million) was utilized at September 26, 2021, and December 31, 2020, respectively. Of that denominated in USD, $0.9 million was utilized at September 26, 2021 and $0.8 million was utilized at December 31, 2020. The Company also has a $4.0 million separate overdraft facility of which none was drawn at September 26, 2021 and at December 31, 2020. The Company has various uncommitted transitional banking and foreign exchange lines available for day-to-day operational purposes. 15. Commitments and Contingencies (continued) Contingencies During February 2014, a cylinder was sold to a long-term customer and ruptured at one of their gas facilities. As a result of this rupture, three people were noted to have injuries such as loss of hearing. There was no major damage to assets of the customer. A claim has been launched by the three people who were injured in the incident. We have reviewed our quality control checks from around the time which the cylinder was produced and no instances of failures have been noted. As a result we do not believe that we are liable for the incident, and therefore, do not currently expect this case to have a material impact on the Company's financial position or results of operations. In November 2018, an explosion occurred at a third-party waste disposal and treatment site in Boise, Idaho, allegedly causing property damage, personal injury, and one fatality. We had contracted with a service company for removal and disposal of certain waste resulting from the magnesium powder manufacturing operations at the Reade facility in Manchester, New Jersey. We believe this service company, in turn, apparently contracted with the third-party disposal company, at whose facility the explosion occurred, for treatment and disposal of the waste. In November 2020, we were named as a defendant in three lawsuits in relation to the incident – one by the third-party disposal company, one by the estate of the decedent, and one by an injured employee of the third-party disposal company. At present, we have received insufficient information on the cause of the explosion. We do not believe that we are liable for the incident, have asserted such, and, therefore, do not currently expect this matter to have a material impact on the Company’s financial position or results of operations.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 26, 2021
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events In October 2021, Luxfer has agreed a new five year, $100.0 million revolving credit facility, ("RCF") which is expected to become effective on October 26, 2021, with no material changes to the financial covenants but with improvements to other restrictive terms. The revised terms include an uncommitted, $50.0 million accordion facility. The existing $50.0 million US private placement notes will also be amended in line with the new RCF terms. Additionally, the amendment includes a $50.0 million, uncommitted shelf facility available to issue long-term notes for up to three years from the effective date.

Basis of Presentation and Res_2

Basis of Presentation and Responsibility for interim Financial Statements (Policies)	9 Months Ended
	Sep. 26, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Responsibility for interim Financial Statements	Basis of Presentation and Responsibility for Interim Financial Statements We prepared the accompanying unaudited consolidated condensed financial statements of Luxfer Holdings PLC and all wholly-owned, majority owned or otherwise controlled subsidiaries on the same basis as our annual audited financial statements. We condensed or omitted certain information and footnote disclosures normally included in our annual audited financial statements, which we prepared in accordance with U.S. Generally Accepted Accounting Principles (GAAP). Our quarterly financial statements should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2020. As used in this report, the terms "we," "us," "our," "Luxfer" and "the Company" mean Luxfer Holdings PLC and its subsidiaries, unless the context indicates another meaning. In the opinion of management, our financial statements reflect all adjustments, which are of a normal recurring nature, necessary for presentation of financial statements for interim periods in accordance with U.S. GAAP and with the instructions to Form 10-Q in Article 10 of Securities and Exchange Commission (SEC) Regulation S-X. The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions about future events that affect the reported amounts of assets and liabilities, the disclosure of contingent liabilities at the date of our financial statements and the reported amounts of revenue and expenses during the reporting periods. Actual results could differ from those estimates, and any such differences may be material to our financial statements.
Fiscal Year	Our fiscal year ends on December 31. We report our interim quarterly periods on a 13-week quarter basis, ending on a Sunday. The Third Quarter 2021, ended on September 26, 2021, and the Third Quarter 2020, ended on September 27, 2020.
Discontinued operations	Discontinued operations Certain amounts in the prior-year financial statements were reclassified to conform to the current-year presentation due to the classification of certain businesses as discontinued operations.
Impact of COVID-19 on the Financial Statements	Impact of COVID-19 on the Financial Statements In March 2020, the World Health Organization characterized the coronavirus ("COVID-19") a pandemic. The rapid spread of the pandemic and the continuously evolving responses to combat it have had an increasingly negative impact on the global economy. Luxfer’s 2020 results were significantly affected by the global macro environment resulting from the COVID-19 pandemic, including broad-based market weakness, which was especially evident in our general industrial and transportation end-markets, contributing to a full year decline of 18.0% and 14.7% respectively, in each of those markets. In the first nine months of 2021, with net sales up 13.5%, a return to growth across all end-markets and adjusted EBITDA up 21.7% on the prior year, the Company has delivered three quarters of strong performance amid the global economic recovery from the COVID-19 pandemic. Furthermore, it continues to operate all of its facilities at near normal production levels, following temporary closures of a few locations in the second and third quarters of 2020. Due to weaker demand resulting from uncertain economic conditions, supply constraints, and the impact of COVID-19, Luxfer implemented additional cost saving programs in the second half of 2020, including headcount reductions. Company performance is now much improved and the apparent success of vaccine programs in the U.S. and Europe has given rise to fewer restrictions, increased stability and macroeconomic recovery. That said, the coronavirus is still prevalent in many of our markets, there are pressures on availability and therefore cost of, raw materials, transport, energy and labor, continuing restrictions on international travel resulting in considerable uncertainty as to when normal conditions will prevail. If warranted, it is possible that the Company may again suspend or reduce operations at certain facilities, which could have an adverse effect on our financial position, results of operations and cash flows. The Company recognized that the COVID-19 pandemic constituted a triggering event in accordance with Accounting Standards Codification, ("ASC"), 350 Intangibles - Goodwill and Other, during the first quarter of 2020 and therefore performed an impairment assessment of its goodwill and other intangible assets. Based on the forecast at that time, we did not identify any impairments, nor marginal outcomes. During 2020 and in the first nine months of 2021, quarterly re-forecasts were performed to assess the impact COVID-19 was having on our results and liquidity, and in the fourth quarter of 2020 we carried out our annual goodwill and other intangibles impairment test using cash flows from the annual and strategic plan budgeting exercise. 1. Basis of Presentation and Responsibility for interim Financial Statements (continued) There have been no subsequent triggering events that has changed our assessment of fair value, as a result, no impairments nor marginal outcomes have been identified. Assumptions and judgments are required in calculating the fair value of the reporting units. In developing our discounted cash flow analysis, assumptions about future revenues and expenses, capital expenditures and changes in working capital are based on our annual operating plan and long-term business plan for each of our reporting units. These plans take into consideration numerous factors including historical experience, anticipated future economic conditions, changes in raw material prices and growth expectations for the industries and end markets we participate in. These assumptions and judgments may change as we learn more about the impact of the COVID-19 pandemic. In relation to liquidity, the Company has access to a revolving credit facility (see Note 9) and has performed stress testing on financial covenants using current forecast information and has not identified any liquidity concerns. Furthermore, the Company has reported historically low levels of net debt and continual strong cash flow generation since the onset of the pandemic.
Accounting standards issued but not yet effective	Accounting standards issued but not yet effective None that will be material to the Company.

Earnings per share (Tables)

Earnings per share (Tables)	9 Months Ended
	Sep. 26, 2021
Earnings Per Share [Abstract]
Schedule of Earnings Per Share	Basic and diluted earnings per share were calculated as follows: Third Quarter Year-to-date In millions except share and per-share data 2021 2020 2021 2020 Basic earnings: Net income from continuing operations $ 6.0 $ 2.4 $ 26.5 $ 14.2 Net (loss) / income from discontinued operations (1.2) 0.2 3.8 (1.3) Net income $ 4.8 $ 2.6 $ 30.3 $ 12.9 Weighted average number of £0.50 ordinary shares: For basic earnings per share 27,722,472 27,619,298 27,718,874 27,532,823 Dilutive effect of potential common stock 311,260 394,408 353,281 426,119 For diluted earnings per share 28,033,732 28,013,706 28,072,155 27,958,942 Earnings / (loss) per share using weighted average number of ordinary shares outstanding 3 : Basic earnings per ordinary share for continuing operations $ 0.22 $ 0.09 $ 0.96 $ 0.52 Basic (loss) / earnings per ordinary share for discontinued operations (0.04) 0.01 0.14 (0.05) Basic earnings per ordinary share $ 0.17 $ 0.09 $ 1.09 $ 0.47 Diluted earnings per ordinary share for continuing operations $ 0.21 $ 0.09 $ 0.94 $ 0.51 Diluted (loss) / earnings per ordinary share for discontinued operations (0.04) 0.01 0.14 (0.05) Diluted earnings per ordinary share $ 0.17 $ 0.09 $ 1.08 $ 0.46 3 The calculation of earnings per share is performed separately for continuing and discontinued operations. As a result, the sum of the two in any particular period may not equal the earnings-per-share amount in total

Net Sales (Tables)

Net Sales (Tables)	9 Months Ended
	Sep. 26, 2021
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	Disaggregated sales disclosures for the quarter and first nine months ended September 26, 2021, and September 27, 2020, are included below and in Note 14, Segmental Information. Third Quarter 2021 2020 In millions Gas Cylinders Elektron Total Gas Cylinders Elektron Total General industrial $ 7.6 $ 21.6 $ 29.2 $ 6.8 $ 20.0 $ 26.8 Transportation 19.7 11.4 31.1 11.9 9.9 21.8 Defense, First Response & Healthcare 18.3 12.6 30.9 13.6 15.5 29.1 Net sales $ 45.6 $ 45.6 $ 91.2 $ 32.3 $ 45.4 $ 77.7 Year-to-date 2021 2020 In millions Gas Cylinders Elektron Total Gas Cylinders Elektron Total General industrial $ 23.3 $ 69.0 $ 92.3 $ 19.6 $ 65.6 $ 85.2 Transportation 50.7 35.1 85.8 37.3 29.7 67.0 Defense, First Response & Healthcare 54.3 43.0 97.3 50.1 40.4 90.5 Net sales $ 128.3 $ 147.1 $ 275.4 $ 107.0 $ 135.7 $ 242.7

Restructuring (Tables)

Restructuring (Tables)	9 Months Ended
	Sep. 26, 2021
Restructuring and Related Activities [Abstract]
Restructuring and Related Costs	Restructuring-related costs included within Restructuring charges in the Condensed Consolidated Financial Statements by reportable segment were as follows: Third Quarter Year-to-date In millions 2021 2020 2021 2020 Severance and related costs Gas Cylinders $ 0.5 $ 3.3 $ 1.1 $ 6.7 Elektron — 0.9 1.0 1.0 Other — — — 0.1 Total restructuring charges $ 0.5 $ 4.2 $ 2.1 $ 7.8
Schedule of Restructuring Reserve	Activity related to restructuring, recorded in Other current liabilities in the consolidated balance sheets is summarized as follows: In millions 2021 Balance at January 1, $ 9.0 Costs incurred 2.1 Cash payments and other (2.5) Balance at September 26, $ 8.6

Supplementary balance sheet i_2

Supplementary balance sheet information (Tables)	9 Months Ended
	Sep. 26, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Condensed Balance Sheet	Supplementary balance sheet information September 26, December 31, In millions 2021 2020 Accounts and other receivables Trade receivables $ 50.0 $ 33.6 Related parties 0.2 0.2 Prepayments and accrued income 6.5 5.5 Derivative financial instruments 0.1 0.2 Deferred consideration 0.9 0.2 Other receivables 1.3 3.4 Total accounts and other receivables $ 59.0 $ 43.1 Inventories Raw materials and supplies $ 36.2 $ 26.2 Work-in-process 23.7 19.7 Finished goods 20.7 22.9 Total inventories $ 80.6 $ 68.8 Other current assets Income tax receivable 1.3 1.5 Total other current assets $ 1.3 $ 1.5 Property, plant and equipment, net Land, buildings and leasehold improvements $ 67.0 $ 65.2 Machinery and equipment 265.6 255.3 Construction in progress 6.5 7.8 Total property, plant and equipment 339.1 328.3 Accumulated depreciation and impairment (250.6) (242.3) Total property, plant and equipment, net $ 88.5 $ 86.0 Other current liabilities Restructuring related liabilities $ 8.6 $ 9.0 Contingent liabilities 1.5 1.1 Derivative financial instruments 0.1 0.4 Operating lease liability 1.1 2.9 Other current liabilities 1.6 0.1 Total other current liabilities $ 12.9 $ 13.5 Other non-current liabilities Contingent liabilities $ 0.6 $ 1.0 Operating lease liability 10.7 6.7 Total other non-current liabilities $ 11.3 $ 7.7
Schedule of Current Held-for-Sale Assets and Liabilities	The respective assets and liabilities of the above disposal group have been reclassified as held-for-sale also included within assets held-for-sale, but not disclosed as discontinued operations, in 2021 and 2020 is one building valued at $3.7 million, within our Elektron Segment. Both of these respective items have been included in the table below. Held-for-sale assets September 26, December 31, In millions 2021 2020 Property, plant and equipment $ 4.8 $ 11.6 Right-of-use-assets from operating leases 0.4 3.1 Inventory 2.7 12.6 Accounts and other receivables 2.6 8.7 Held-for-sale assets $ 10.5 $ 36.0 Held-for-sale liabilities Accounts payable 0.6 4.3 Accrued liabilities 0.1 1.5 Other current liabilities 1.0 5.6 Held-for-sale liabilities $ 1.7 $ 11.4 Results of discontinued operations were as follows: Third Quarter Year-to-date In millions 2021 2020 2021 2020 Net sales $ 4.9 $ 12.7 $ 19.5 $ 41.0 Cost of goods sold (4.7) (13.3) (20.4) (40.4) Gross profit / (loss) $ 0.2 $ (0.6) $ (0.9) $ 0.6 Selling, general and administrative expenses (1.4) (1.4) (3.1) (4.1) Restructuring charges — (0.1) — (0.1) Other income — 2.3 — 2.3 Operating (loss) / profit $ (1.2) $ 0.2 $ (4.0) $ (1.3) Tax credit 0.5 — 1.2 — Net (loss) / income $ (0.7) $ 0.2 $ (2.8) $ (1.3) Third Quarter In millions 2021 Cash consideration received $ 3.5 Deferred consideration payable 0.6 Less Net assets sold (4.2) Gross loss on disposition (0.1) Provision for income taxes — Net loss on disposition $ (0.1) The assets and liabilities classified as held-for-sale related to discontinued operations were as follows: Held-for-sale assets September 26, December 31, In millions 2021 2020 Property, plant and equipment $ 1.1 $ 7.9 Right-of-use-assets from operating leases 0.4 3.1 Inventory 2.7 12.6 Accounts and other receivables 2.6 8.7 Held-for-sale assets $ 6.8 $ 32.3 Held-for-sale liabilities Accounts payable 0.6 4.3 Accrued liabilities 0.1 1.5 Other current liabilities 1.0 5.6 Held-for-sale liabilities $ 1.7 $ 11.4 The depreciation and amortization, capital expenditures and significant non-cash items were as follows: Third Quarter Year-to-date In millions 2021 2020 2021 2020 Cash flows from discontinued operations: Depreciation $ 0.1 $ 0.2 $ 0.4 $ 0.8

Goodwill and other identifiab_2

Goodwill and other identifiable intangible assets (Tables)	9 Months Ended
	Sep. 26, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	Changes in goodwill during the first nine months ended September 26, 2021, were as follows: In millions Gas Cylinders Elektron Total At January 1, 2021 $ 27.9 $ 42.3 $ 70.2 Additions 2.6 — 2.6 Exchange difference 0.1 — 0.1 Net balance at September 26, 2021 $ 30.6 $ 42.3 $ 72.9
Schedule of Intangible Assets	Identifiable intangible assets consisted of the following: September 26, 2021 December 31, 2020 In millions Gross Accumulated amortization Net Gross Accumulated amortization Net Customer relationships $ 13.4 $ (5.5) $ 7.9 $ 13.4 $ (5.2) $ 8.2 Technology and trading related 8.3 (4.0) 4.3 8.3 (3.7) 4.6 $ 21.7 $ (9.5) $ 12.2 $ 21.7 $ (8.9) $ 12.8

Debt (Tables)

Debt (Tables)	9 Months Ended
	Sep. 26, 2021
Debt Disclosure [Abstract]
Schedule of Debt	Debt outstanding was as follows: In millions September 26, 2021 December 31, 2020 4.88% Loan Notes due 2023 $ 25.0 $ 25.0 4.94% Loan Notes due 2026 25.0 25.0 Revolving credit facility — 4.1 Unamortized debt issuance costs (0.4) (0.7) Total debt $ 49.6 $ 53.4 Less current portion $ — $ — Non-current debt $ 49.6 $ 53.4
Schedule of Maturities of Company's Debt	The maturity profile of the Company's debt, excluding unamortized issuance costs and discounts, is as follows: In millions 2021 2022 2023 2024 2025 Thereafter Total Loan Notes due 2023 $ — $ — $ 25.0 $ — $ — $ — $ 25.0 Loan Notes due 2026 — — — — — 25.0 25.0 Total debt $ — $ — $ 25.0 $ — $ — $ 25.0 $ 50.0

Discontinued Operations (Tables

Discontinued Operations (Tables)	9 Months Ended
	Sep. 26, 2021
Discontinued Operations and Disposal Groups [Abstract]
Schedule of Results of Discontinued Operations	The respective assets and liabilities of the above disposal group have been reclassified as held-for-sale also included within assets held-for-sale, but not disclosed as discontinued operations, in 2021 and 2020 is one building valued at $3.7 million, within our Elektron Segment. Both of these respective items have been included in the table below. Held-for-sale assets September 26, December 31, In millions 2021 2020 Property, plant and equipment $ 4.8 $ 11.6 Right-of-use-assets from operating leases 0.4 3.1 Inventory 2.7 12.6 Accounts and other receivables 2.6 8.7 Held-for-sale assets $ 10.5 $ 36.0 Held-for-sale liabilities Accounts payable 0.6 4.3 Accrued liabilities 0.1 1.5 Other current liabilities 1.0 5.6 Held-for-sale liabilities $ 1.7 $ 11.4 Results of discontinued operations were as follows: Third Quarter Year-to-date In millions 2021 2020 2021 2020 Net sales $ 4.9 $ 12.7 $ 19.5 $ 41.0 Cost of goods sold (4.7) (13.3) (20.4) (40.4) Gross profit / (loss) $ 0.2 $ (0.6) $ (0.9) $ 0.6 Selling, general and administrative expenses (1.4) (1.4) (3.1) (4.1) Restructuring charges — (0.1) — (0.1) Other income — 2.3 — 2.3 Operating (loss) / profit $ (1.2) $ 0.2 $ (4.0) $ (1.3) Tax credit 0.5 — 1.2 — Net (loss) / income $ (0.7) $ 0.2 $ (2.8) $ (1.3) Third Quarter In millions 2021 Cash consideration received $ 3.5 Deferred consideration payable 0.6 Less Net assets sold (4.2) Gross loss on disposition (0.1) Provision for income taxes — Net loss on disposition $ (0.1) The assets and liabilities classified as held-for-sale related to discontinued operations were as follows: Held-for-sale assets September 26, December 31, In millions 2021 2020 Property, plant and equipment $ 1.1 $ 7.9 Right-of-use-assets from operating leases 0.4 3.1 Inventory 2.7 12.6 Accounts and other receivables 2.6 8.7 Held-for-sale assets $ 6.8 $ 32.3 Held-for-sale liabilities Accounts payable 0.6 4.3 Accrued liabilities 0.1 1.5 Other current liabilities 1.0 5.6 Held-for-sale liabilities $ 1.7 $ 11.4 The depreciation and amortization, capital expenditures and significant non-cash items were as follows: Third Quarter Year-to-date In millions 2021 2020 2021 2020 Cash flows from discontinued operations: Depreciation $ 0.1 $ 0.2 $ 0.4 $ 0.8

Share Plans (Tables)

Share Plans (Tables)	9 Months Ended
	Sep. 26, 2021
Share-based Payment Arrangement [Abstract]
Schedule of Share-based Compensation Expense	Total share-based compensation expense for the quarters ended September 26, 2021, and September 27, 2020, was as follows: Third Quarter Year-to-date In millions 2021 2020 2021 2020 Total share-based compensation charges $ 0.8 $ 0.8 $ 2.2 $ 2.1
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions	The following table illustrates the assumptions used in deriving the fair value of share options granted during 2021 and the year-ended December 31, 2020: 2021 2020 Dividend yield (%) 3.39 - 4.09 3.39 - 4.09 Expected volatility range (%) 36.48 - 56.28 36.48 - 56.28 Risk-free interest rate (%) 0.18 - 0.49 0.18 - 0.49 Expected life of share options range (years) 0.50 - 4.00 0.50 - 4.00 Forfeiture rate 5.00 5.00 Weighted average exercise price ($) $1.00 $1.00 Model used Black-Scholes & Monte-Carlo Black-Scholes & Monte-Carlo

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	9 Months Ended
	Sep. 26, 2021
Equity [Abstract]
Schedule of Dividends Paid and Proposed	Third Quarter Year-to-date In millions 2021 2020 2021 2020 Dividends declared and paid during the year: Interim dividend paid February 5, 2020 ($0.125 per ordinary share) $ — $ — $ — $ 3.4 Interim dividend paid May 6, 2020 ($0.125 per ordinary share) — — — 3.4 Interim dividend paid August 5, 2020 ($0.125 per ordinary share) — 3.4 — 3.4 Interim dividend paid February 4, 2021 ($0.125 per ordinary share) — — 3.4 — Interim dividend paid May 5, 2021 ($0.125 per ordinary share) — — 3.4 — Interim dividend paid August 4, 2021 ($0.125 per ordinary share) 3.4 — 3.4 — $ 3.4 $ 3.4 $ 10.2 $ 10.2 In millions 2021 2020 Dividends declared and paid after the quarter end (not recognized as a liability at the quarter end): Interim dividend declared October 5, and to be paid November 4, 2020 ($0.125 per ordinary share) $ — $ 3.4 Interim dividend declared October 5, and to be paid November 3, 2021 ($0.125 per ordinary share) 3.4 — $ 3.4 $ 3.4

Segmental Information (Tables)

Segmental Information (Tables)	9 Months Ended
	Sep. 26, 2021
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	Financial information by reportable segment for the Third Quarter and year-to-date ended September 26, 2021, and September 27, 2020, is included in the following summary: Net sales Adjusted EBITDA Third Quarter Year-to-date Third Quarter Year-to-date In millions 2021 2020 2021 2020 2021 2020 2021 2020 Gas Cylinders segment $ 45.6 $ 32.3 $ 128.3 $ 107.0 $ 5.4 $ 7.1 $ 16.7 $ 16.6 Elektron segment 45.6 45.4 147.1 135.7 8.4 6.6 32.1 23.5 Consolidated $ 91.2 $ 77.7 $ 275.4 $ 242.7 $ 13.8 $ 13.7 $ 48.8 $ 40.1 Depreciation and amortization (1) Restructuring charges Third Quarter Year-to-date Third Quarter Year-to-date In millions 2021 2020 2021 2020 2021 2020 2021 2020 Gas Cylinders segment $ 1.4 $ 1.0 $ 3.9 $ 2.8 $ 0.5 $ 3.3 $ 1.1 $ 6.7 Elektron segment 2.4 2.4 7.3 7.2 — 0.9 1.0 1.0 Other — — — — — — — 0.1 Consolidated $ 3.8 $ 3.4 $ 11.2 $ 10.0 $ 0.5 $ 4.2 $ 2.1 $ 7.8 (1) Depreciation and amortization includes the expense recognized in relation to assets, and excludes amortization of debt issue costs. 14. Segmental Information (continued) Total assets Capital expenditures September 26, December 31, Third Quarter Year-to-date In millions 2021 2020 2021 2020 2021 2020 Gas Cylinders segment $ 128.3 $ 99.7 $ 0.2 $ 0.7 $ 0.7 $ 1.7 Elektron segment 194.8 189.7 1.8 0.9 4.9 3.4 Other 40.3 24.7 — — — — Discontinued operations 6.9 32.3 — — — — Consolidated $ 370.3 $ 346.4 $ 2.0 $ 1.6 $ 5.6 $ 5.1
Property, Plant and Equipment, Net by Geographic Region	Property, plant and equipment, net September 26, December 31, In millions 2021 2020 U.S. $ 47.4 $ 44.3 United Kingdom 36.3 36.6 Canada 3.4 3.7 Rest of Europe 1.1 1.1 Asia Pacific 0.3 0.3 $ 88.5 $ 86.0
Reconciliation of Operating Profit (Loss) from Segments to Consolidated	The following table presents a reconciliation of Adjusted EBITDA to net income from continuing operations: Third Quarter Year-to-date In millions 2021 2020 2021 2020 Adjusted EBITDA $ 13.8 $ 13.7 $ 48.8 $ 40.1 Other share-based compensation charges (0.8) (0.8) (2.2) (2.1) Depreciation and amortization (3.8) (3.4) (11.2) (10.0) Restructuring charges (0.5) (4.2) (2.1) (7.8) Acquisition and disposal related costs (0.6) — (1.5) (0.2) Other charges — — (1.1) — Defined benefits pension credit 0.6 1.1 1.8 3.3 Interest expense, net (0.8) (1.2) (2.4) (3.5) Provision for income taxes (1.9) (2.8) (3.6) (5.6) Net income from continuing operations $ 6.0 $ 2.4 $ 26.5 $ 14.2
Revenue from External Customers and Long-term Assets by Geographic Areas	The following tables present certain geographic information by geographic region for the Third Quarter and year-to-date ended September 26, 2021, and September 27, 2020: Net Sales (1) Third Quarter Year-to-date 2021 2020 2021 2020 $M Percent $M Percent $M Percent $M Percent United States $ 49.4 54.2 % $ 41.1 52.9 % $ 151.8 55.1 % $ 132.8 54.8 % U.K. 6.5 7.1 % 4.1 5.3 % 17.5 6.4 % 13.8 5.7 % Germany 5.1 5.6 % 3.1 4.0 % 13.2 4.8 % 11.0 4.5 % France 2.6 2.9 % 4.9 6.3 % 9.3 3.4 % 14.0 5.8 % Italy 3.5 3.8 % 1.9 2.4 % 9.5 3.4 % 8.1 3.3 % Top five countries $ 67.1 73.6 % $ 55.1 70.9 % $ 201.3 73.1 % $ 179.7 74.1 % Rest of Europe 4.9 5.4 % 5.8 7.5 % 19.0 6.9 % 18.1 7.5 % Asia Pacific 13.7 15.0 % 12.1 15.6 % 38.1 13.8 % 32.9 13.5 % Other (2) 5.5 6.0 % 4.7 6.0 % 17.0 6.2 % 12.0 4.9 % $ 91.2 $ 77.7 $ 275.4 $ 242.7 (1) Net sales are based on the geographic destination of sale. (2) Other includes Canada, South America, Central America and Africa.

Basis of Presentation and Res_3

Basis of Presentation and Responsibility for interim Financial Statements (Details)	9 Months Ended	12 Months Ended
	Sep. 26, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Change in revenue from prior period, percent	13.50%
Change In EBITDA from prior period, percent	21.70%
General industrial
Disaggregation of Revenue [Line Items]
Change in revenue from prior period, percent		(18.00%)
Transportation
Disaggregation of Revenue [Line Items]
Change in revenue from prior period, percent		(14.70%)

Earnings per share (Details)

Earnings per share (Details) $ / shares in Units, $ in Millions		3 Months Ended						9 Months Ended
		Sep. 26, 2021USD ($)$ / sharesshares	Jun. 27, 2021USD ($)	Mar. 28, 2021USD ($)	Sep. 27, 2020USD ($)$ / sharesshares	Jun. 28, 2020USD ($)	Mar. 29, 2020USD ($)	Sep. 26, 2021USD ($)$ / sharesshares	Sep. 27, 2020USD ($)$ / sharesshares	Sep. 26, 2021£ / shares	Dec. 31, 2020£ / shares	Sep. 27, 2020£ / shares
Basic earnings:
Net income from continuing operations | $		$ 6			$ 2.4			$ 26.5	$ 14.2
Net (loss) / income from discontinued operations | $		(1.2)			0.2			3.8	(1.3)
Net income | $		$ 4.8	$ 11	$ 14.5	$ 2.6	$ 4.1	$ 6.2	$ 30.3	$ 12.9
Weighted average number of £0.50 ordinary shares:
For basic earnings per share (in shares) | shares		27,722,472			27,619,298			27,718,874	27,532,823
Dilutive effect of potential common stock (in shares) | shares		311,260			394,408			353,281	426,119
For diluted earnings per share (in shares) | shares		28,033,732			28,013,706			28,072,155	27,958,942
Earnings / (loss) per share using weighted average number of ordinary shares outstanding:
Basic earnings per ordinary share for continuing operations (usd per share)	[1]	$ 0.22			$ 0.09			$ 0.96	$ 0.52
Basic (loss)/earnings per ordinary share for discontinued operations (usd per share)	[1],[2]	(0.04)			0.01			0.14	(0.05)
Basic (usd per share)	[1]	0.17			0.09			1.09	0.47
Diluted earnings per ordinary share for continuing operations (usd per share)		0.21			0.09			0.94	0.51
Diluted (loss)/earnings per ordinary share for discontinued operations (usd per share)	[2]	(0.04)			0.01			0.14	(0.05)
Diluted (usd per share)		$ 0.17			$ 0.09			$ 1.08	$ 0.46
Ordinary shares
Class of Stock [Line Items]
Common stock, par value (in EUR per share) | £ / shares										£ 0.50	£ 0.50	£ 0.50
[1]	The calculation of earnings per share is performed separately for continuing and discontinued operations. As a result, the sum of the two in any particular period may not equal the earnings-per-share amount in total.
[2]	The loss per share for discontinued operations in the Third Quarter of 2021 and the year-to-date of 2020 has not been diluted, since the incremental shares included in the weighted-average number of shares outstanding would have been anti-dilutive.

Net Sales - Disaggregation of R

Net Sales - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 91.2	$ 77.7	$ 275.4	$ 242.7
General industrial
Disaggregation of Revenue [Line Items]
Net sales	29.2	26.8	92.3	85.2
Transportation
Disaggregation of Revenue [Line Items]
Net sales	31.1	21.8	85.8	67
Defense, First Response & Healthcare
Disaggregation of Revenue [Line Items]
Net sales	30.9	29.1	97.3	90.5
Gas Cylinders
Disaggregation of Revenue [Line Items]
Net sales	45.6	32.3	128.3	107
Gas Cylinders | General industrial
Disaggregation of Revenue [Line Items]
Net sales	7.6	6.8	23.3	19.6
Gas Cylinders | Transportation
Disaggregation of Revenue [Line Items]
Net sales	19.7	11.9	50.7	37.3
Gas Cylinders | Defense, First Response & Healthcare
Disaggregation of Revenue [Line Items]
Net sales	18.3	13.6	54.3	50.1
Elektron
Disaggregation of Revenue [Line Items]
Net sales	45.6	45.4	147.1	135.7
Elektron | General industrial
Disaggregation of Revenue [Line Items]
Net sales	21.6	20	69	65.6
Elektron | Transportation
Disaggregation of Revenue [Line Items]
Net sales	11.4	9.9	35.1	29.7
Elektron | Defense, First Response & Healthcare
Disaggregation of Revenue [Line Items]
Net sales	$ 12.6	$ 15.5	$ 43	$ 40.4

Restructuring - Narrative (Deta

Restructuring - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0.5	$ 4.2	$ 2.1	$ 7.8
Other Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.5	4.2	2.1	7.8
Severance and related costs		4.2		7.8
Gas Cylinders
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.3	3.3	1	6.5
Gas Cylinders | Other Restructuring
Restructuring Cost and Reserve [Line Items]
Severance and related costs	0.5	3.3	1.1	6.7
Elektron | One-time Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges			0.9
Elektron | Other Restructuring
Restructuring Cost and Reserve [Line Items]
Severance and related costs	$ 0	0.9	$ 1	1
Elektron | COVID-19 Restructuring, Fixed Cost Reduction
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 0.9		$ 1.3

Restructuring - Charges (Detail

Restructuring - Charges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 0.5	$ 4.2	$ 2.1	$ 7.8
Other Restructuring
Restructuring Cost and Reserve [Line Items]
Severance and related costs		4.2		7.8
Total restructuring charges	0.5	4.2	2.1	7.8
Gas Cylinders
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	0.3	3.3	1	6.5
Gas Cylinders | Other Restructuring
Restructuring Cost and Reserve [Line Items]
Severance and related costs	0.5	3.3	1.1	6.7
Elektron | Other Restructuring
Restructuring Cost and Reserve [Line Items]
Severance and related costs	0	0.9	1	1
Other | Other Restructuring
Restructuring Cost and Reserve [Line Items]
Severance and related costs	$ 0	$ 0	$ 0	$ 0.1

Restructuring - Reserve (Detail

Restructuring - Reserve (Details) $ in Millions	9 Months Ended
	Sep. 26, 2021USD ($)
Restructuring Reserve [Roll Forward]
Beginning balance	$ 9
Costs incurred	2.1
Cash payments and other	(2.5)
Ending balance	$ 8.6

Acquisition and disposal rela_2

Acquisition and disposal related costs - Narratives (Details) - USD ($) $ in Millions	Mar. 15, 2021	Sep. 26, 2021	Sep. 26, 2021	Sep. 27, 2020
Business Acquisition [Line Items]
Adjustment from property, plant and equipment to goodwill		$ 0.2
Acquisition-related costs		$ 0.6	$ 1.5	$ 0.2
Release of deferred contingent consideration				0.1
Maximum | Luxfer Uttam India Private Limited
Business Acquisition [Line Items]
Gain on sale of investments (less than)				$ 0.1
Luxfer Uttam India Private Limited | Equity Method Investee
Business Acquisition [Line Items]
Equity method investment, ownership percentage				51.00%
Structural Composites Industries LLC
Business Acquisition [Line Items]
Cash consideration transferred	$ 19.3

Other charges (Details)

Other charges (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Dec. 31, 2021	Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020
Other Commitments [Line Items]
Other charges		$ 0	$ 0	$ (1.1)	$ 0
Forecast
Other Commitments [Line Items]
Other charges	$ 0

Supplementary balance sheet i_3

Supplementary balance sheet information - Schedule of Condensed Balance Sheet (Details) - USD ($) $ in Millions	Sep. 26, 2021	Dec. 31, 2020
Accounts and other receivables
Trade receivables	$ 50	$ 33.6
Related parties	0.2	0.2
Prepayments and accrued income	6.5	5.5
Derivative financial instruments	0.1	0.2
Deferred consideration	0.9	0.2
Other receivables	1.3	3.4
Total accounts and other receivables	59	43.1
Inventories
Raw materials and supplies	36.2	26.2
Work-in-process	23.7	19.7
Finished goods	20.7	22.9
Total inventories	80.6	68.8
Other current assets
Income tax receivable	1.3	1.5
Total other current assets	1.3	1.5
Property, Plant and Equipment [Abstract]
Total property, plant and equipment	339.1	328.3
Accumulated depreciation and impairment	(250.6)	(242.3)
Total property, plant and equipment, net	88.5	86
Other current liabilities
Restructuring related liabilities	8.6	9
Contingent liabilities	1.5	1.1
Derivative financial instruments	$ 0.1	$ 0.4
Operating lease, liability, current, statement of financial position [extensible enumeration]	Total other current liabilities	Total other current liabilities
Operating lease liability	$ 1.1	$ 2.9
Other current liabilities	1.6	0.1
Total other current liabilities	12.9	13.5
Other non-current liabilities
Contingent liabilities	$ 0.6	$ 1
Operating lease, liability, noncurrent, statement of financial position [extensible enumeration]	Total other non-current liabilities	Total other non-current liabilities
Operating lease liability	$ 10.7	$ 6.7
Total other non-current liabilities	11.3	7.7
Land, buildings and leasehold improvements
Property, Plant and Equipment [Abstract]
Total property, plant and equipment	67	65.2
Machinery and equipment
Property, Plant and Equipment [Abstract]
Total property, plant and equipment	265.6	255.3
Construction in progress
Property, Plant and Equipment [Abstract]
Total property, plant and equipment	$ 6.5	$ 7.8

Supplementary balance sheet i_4

Supplementary balance sheet information - Schedule of Current Held-for-Sale Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 26, 2021	Dec. 31, 2020
Held-for-sale assets
Held-for-sale assets	$ 10.5	$ 36
Held-for-sale liabilities
Held-for-sale liabilities	1.7	11.4
Held-for-sale | Superform Aluminum Superplastic
Held-for-sale assets
Property, plant and equipment	4.8	11.6
Right-of-use-assets from operating leases	0.4	3.1
Inventory	2.7	12.6
Accounts and other receivables	2.6	8.7
Held-for-sale assets	10.5	36
Held-for-sale liabilities
Accounts payable	0.6	4.3
Accrued liabilities	0.1	1.5
Other current liabilities	1	5.6
Held-for-sale liabilities	$ 1.7	$ 11.4

Goodwill and other identifiab_3

Goodwill and other identifiable intangible assets - Schedule of Goodwill (Details) $ in Millions	9 Months Ended
	Sep. 26, 2021USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 70.2
Additions	2.6
Exchange difference	0.1
Ending balance	72.9
Gas Cylinders
Goodwill [Roll Forward]
Beginning balance	27.9
Additions	2.6
Exchange difference	0.1
Ending balance	30.6
Elektron
Goodwill [Roll Forward]
Beginning balance	42.3
Additions	0
Exchange difference	0
Ending balance	$ 42.3

Goodwill and other identifiab_4

Goodwill and other identifiable intangible assets - Schedule of Intangible Assets (Details) - USD ($) $ in Millions	Sep. 26, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets
Gross	$ 21.7	$ 21.7
Accumulated amortization	(9.5)	(8.9)
Net	12.2	12.8
Customer relationships
Finite-Lived Intangible Assets
Gross	13.4	13.4
Accumulated amortization	(5.5)	(5.2)
Net	7.9	8.2
Technology and trading related
Finite-Lived Intangible Assets
Gross	8.3	8.3
Accumulated amortization	(4)	(3.7)
Net	$ 4.3	$ 4.6

Goodwill and other identifiab_5

Goodwill and other identifiable intangible assets - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 0.7	$ 0.6
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity
2021	0.2
2022	0.9
2023	0.9
2024	0.9
2025	0.9
2026	$ 0.9

Debt - Schedule of Debt Outstan

Debt - Schedule of Debt Outstanding (Details) - USD ($)	Sep. 26, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ (400,000)	$ (700,000)
Total debt	49,600,000	53,400,000
Less current portion	0	0
Non-current debt	49,600,000	53,400,000
Revolving credit facility
Debt Instrument [Line Items]
Long-term debt, gross	0	4,100,000
Loan Notes
Debt Instrument [Line Items]
Long-term debt, gross	$ 50,000,000
Loan Notes | 4.88% Loan Notes due 2023
Debt Instrument [Line Items]
Debt stated interest rate	4.88%
Long-term debt, gross	$ 25,000,000	25,000,000
Loan Notes | 4.94% Loan Notes due 2026
Debt Instrument [Line Items]
Debt stated interest rate	4.94%
Long-term debt, gross	$ 25,000,000	$ 25,000,000

Debt - Narrative (Details)

Debt - Narrative (Details) - USD ($)	Sep. 26, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Borrowing capacity	$ 4,000,000
Revolving credit facility
Debt Instrument [Line Items]
Debt, weighted average interest rate	1.63%			2.19%
Long-term debt, gross	$ 0			$ 4,100,000
Borrowing capacity	$ 100,000,000			$ 145,900,000
Debt maximum borrowing capacity		$ 100,000,000	$ 150,000,000

Debt - Schedule of Maturities o

Debt - Schedule of Maturities of Company's Debt (Details) - Loan Notes - USD ($) $ in Millions	Sep. 26, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
2021	$ 0
2022	0
2023	25
2024	0
2025	0
Thereafter	25
Total	50
4.88% Loan Notes due 2023
Debt Instrument [Line Items]
2021	0
2022	0
2023	25
2024	0
2025	0
Thereafter	0
Total	25	$ 25
4.94% Loan Notes due 2026
Debt Instrument [Line Items]
2021	0
2022	0
2023	0
2024	0
2025	0
Thereafter	25
Total	$ 25	$ 25

Discontinued Operations - Narra

Discontinued Operations - Narrative (Details) $ / shares in Units, $ in Millions		3 Months Ended				9 Months Ended
		Sep. 26, 2021USD ($)building$ / shares	Jun. 27, 2021USD ($)	Mar. 28, 2021USD ($)	Sep. 27, 2020USD ($)$ / shares	Sep. 26, 2021USD ($)building$ / shares	Sep. 27, 2020USD ($)$ / shares	Dec. 31, 2020USD ($)building
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Basic from discontinued operations (usd per share) | $ / shares	[1],[2]	$ (0.04)			$ 0.01	$ 0.14	$ (0.05)
Gain / (loss) on disposition of discontinued operations, net of tax		$ (0.5)			$ 0	$ 6.6	$ 0
(Loss) / income from discontinued operations, net of tax		$ (0.7)			0.2	$ (2.8)	(1.3)
Held-for-sale | Building | Elektron
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties to be disposed | building		1				1		1
Amount of property disposed		$ 3.7				$ 3.7		$ 3.7
Superform Aluminum Superplastic | Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) / income from discontinued operations, net of tax		(0.7)			$ 0.2	(2.8)	$ (1.3)
Superform Aluminum Superplastic | Discontinued Operations, Held-for-sale | U.S.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration received			$ 21	$ 20.2
Working capital adjustment			$ 0.8
Gain / (loss) on disposition of discontinued operations, net of tax				6.7
Tax charge				$ 2
Superform Aluminum Superplastic | Discontinued Operations, Held-for-sale | United Kingdom
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration received		4.1				4.1
Cash consideration received		3.5				3.5
Deferred consideration payable		0.6				0.6
Gain / (loss) on disposition of discontinued operations, net of tax		(0.1)
Tax charge		0
Superform Aluminum Superplastic | Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Amount of property disposed		4.8				$ 4.8		$ 11.6
Graham | Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Working capital adjustment		0.4
Gain / (loss) on disposition of discontinued operations, net of tax		$ (0.5)
[1]	The loss per share for discontinued operations in the Third Quarter of 2021 and the year-to-date of 2020 has not been diluted, since the incremental shares included in the weighted-average number of shares outstanding would have been anti-dilutive.
[2]	The calculation of earnings per share is performed separately for continuing and discontinued operations. As a result, the sum of the two in any particular period may not equal the earnings-per-share amount in total.

Discontinued Operations - Resul

Discontinued Operations - Results of Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net (loss) / income	$ (0.7)	$ 0.2	$ (2.8)	$ (1.3)
Net loss on disposition	(0.5)	0	6.6	0
Discontinued Operations, Held-for-sale | Superform Aluminum Superplastic
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	4.9	12.7	19.5	41
Cost of goods sold	(4.7)	(13.3)	(20.4)	(40.4)
Gross profit / (loss)	0.2	(0.6)	(0.9)	0.6
Selling, general and administrative expenses	(1.4)	(1.4)	(3.1)	(4.1)
Restructuring charges	0	(0.1)	0	(0.1)
Other income	0	2.3	0	2.3
Operating (loss) / profit	(1.2)	0.2	(4)	(1.3)
Tax credit	0.5	0	1.2	0
Net (loss) / income	(0.7)	$ 0.2	(2.8)	$ (1.3)
Discontinued Operations, Held-for-sale | Superform Aluminum Superplastic | United Kingdom
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash consideration received	3.5		3.5
Deferred consideration payable	0.6		0.6
Net assets sold	(4.2)		$ (4.2)
Gross loss on disposition	(0.1)
Provision for income taxes	0
Net loss on disposition	$ (0.1)

Discontinued Operations - Asset

Discontinued Operations - Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 26, 2021	Dec. 31, 2020
Held-for-sale assets
Held-for-sale assets	$ 10.5	$ 36
Held-for-sale liabilities
Held-for-sale liabilities	1.7	11.4
Discontinued Operations | Superform Aluminum Superplastic
Held-for-sale assets
Property, plant and equipment	1.1	7.9
Right-of-use-assets from operating leases	0.4	3.1
Inventory	2.7	12.6
Accounts and other receivables	2.6	8.7
Held-for-sale assets	6.8	32.3
Held-for-sale liabilities
Accounts payable	0.6	4.3
Accrued liabilities	0.1	1.5
Other current liabilities	1	5.6
Held-for-sale liabilities	$ 1.7	$ 11.4

Discontinued Operations - Cash

Discontinued Operations - Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020
Discontinued Operations and Disposal Groups [Abstract]
Depreciation	$ 0.1	$ 0.2	$ 0.4	$ 0.8

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020
Income Tax Disclosure [Abstract]
Effective income tax rate	12.00%	28.10%
Change in enacted tax rate, amount	$ 2.8

Share Plans - Schedule of Share

Share Plans - Schedule of Share-based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020
Share-based Payment Arrangement [Abstract]
Total share-based compensation charges	$ 0.8	$ 0.8	$ 2.2	$ 2.1

Share Plans - Narrative (Detail

Share Plans - Narrative (Details) - $ / shares	1 Months Ended	6 Months Ended
	Mar. 31, 2021	Jun. 27, 2021
Share-based Payment Arrangement [Abstract]
Granted during the year (in shares)	110,000	19,184
Granted during the year (in USD per share)	$ 21.14	$ 21.69
Granted during the year, based on total shareholder return (in shares)	45,000

Share Plans - Share Options Fai

Share Plans - Share Options Fair Value Assumptions (Details) - $ / shares	9 Months Ended	12 Months Ended
	Sep. 26, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility range (%), minimum	36.48%	36.48%
Expected volatility range (%), maximum	56.28%	56.28%
Risk-free interest rate (%), minimum	0.18%	0.18%
Risk-free interest rate (%), maximum	0.49%	0.49%
Forfeiture rate	5.00%	5.00%
Weighted average exercise price (in USD per share)	$ 1	$ 1
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield (%)	3.39%	3.39%
Expected life of share options range (years)	6 months	6 months
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield (%)	4.09%	4.09%
Expected life of share options range (years)	4 years	4 years

Shareholders' Equity - Schedule

Shareholders' Equity - Schedule of Dividend Paid and Proposed (Details) - USD ($) $ / shares in Units, $ in Millions	Nov. 03, 2021	Aug. 04, 2021	May 05, 2021	Feb. 04, 2021	Nov. 04, 2020	Aug. 05, 2020	May 06, 2020	Feb. 05, 2020	Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020
Class of Stock [Line Items]
Dividends paid (in USD per share)		$ 0.125	$ 0.125	$ 0.125	$ 0.125		$ 0.125	$ 0.125
Dividends paid		$ 3.4	$ 3.4	$ 3.4	$ 3.4	$ 3.4	$ 3.4	$ 3.4	$ 3.4	$ 3.4	$ 10.2	$ 10.2
Subsequent Event
Class of Stock [Line Items]
Dividends paid (in USD per share)	$ 0.125
Dividends paid	$ 3.4

Shareholders' Equity - Narrativ

Shareholders' Equity - Narratives (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 26, 2021USD ($)shares	Sep. 26, 2021USD ($)shares
Equity [Abstract]
Purchase of own shares (in shares)	88,734	126,734
Shares acquired and retired, value | $	$ 1.9
Shares acquired, value | $	$ 1.5	$ 2.8
Shares cancelled (in shares)		56,000
Shares retained (in shares)	70,374	70,374

Segmental Information - Narrati

Segmental Information - Narrative (Details)	9 Months Ended
	Sep. 26, 2021segmentbusinessUnit
Segment Reporting [Abstract]
Number of operating segments	2
Number of operating divisions | businessUnit	4
Number of reportable segments	2

Segmental Information - Financi

Segmental Information - Financial Information by Reportable Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Net sales	$ 91.2	$ 77.7	$ 275.4	$ 242.7
Adjusted EBITDA	13.8	13.7	48.8	40.1
Depreciation and amortization	3.8	3.4	11.2	10
Restructuring charges	0.5	4.2	2.1	7.8
Total assets	370.3		370.3		$ 346.4
Capital expenditures	2	1.6	5.6	5.1
Discontinued Operations
Segment Reporting Information [Line Items]
Total assets	6.9		6.9		32.3
Capital expenditures	0	0	0	0
Gas Cylinders
Segment Reporting Information [Line Items]
Net sales	45.6	32.3	128.3	107
Elektron
Segment Reporting Information [Line Items]
Net sales	45.6	45.4	147.1	135.7
Operating Segments | Gas Cylinders
Segment Reporting Information [Line Items]
Net sales	45.6	32.3	128.3	107
Adjusted EBITDA	5.4	7.1	16.7	16.6
Depreciation and amortization	1.4	1	3.9	2.8
Restructuring charges	0.5	3.3	1.1	6.7
Total assets	128.3		128.3		99.7
Capital expenditures	0.2	0.7	0.7	1.7
Operating Segments | Elektron
Segment Reporting Information [Line Items]
Net sales	45.6	45.4	147.1	135.7
Adjusted EBITDA	8.4	6.6	32.1	23.5
Depreciation and amortization	2.4	2.4	7.3	7.2
Restructuring charges	0	0.9	1	1
Total assets	194.8		194.8		189.7
Capital expenditures	1.8	0.9	4.9	3.4
Other
Segment Reporting Information [Line Items]
Depreciation and amortization	0	0	0	0
Restructuring charges	0	0	0	0.1
Total assets	40.3		40.3		$ 24.7
Capital expenditures	$ 0	$ 0	$ 0	$ 0

Segmental Information - Propert

Segmental Information - Property, Plant and Equipment by Geographic Region (Details) - USD ($) $ in Millions	Sep. 26, 2021	Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 88.5	$ 86
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	47.4	44.3
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	36.3	36.6
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	3.4	3.7
Rest of Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	1.1	1.1
Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 0.3	$ 0.3

Segmental Information - Reconci

Segmental Information - Reconciliation of Consolidated Segment Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020
Segment Reporting [Abstract]
Adjusted EBITDA	$ 13.8	$ 13.7	$ 48.8	$ 40.1
Other share-based compensation charges	(0.8)	(0.8)	(2.2)	(2.1)
Depreciation and amortization	(3.8)	(3.4)	(11.2)	(10)
Restructuring charges	(0.5)	(4.2)	(2.1)	(7.8)
Acquisition and disposal related costs	(0.6)	0	(1.5)	(0.2)
Other charges	0	0	(1.1)	0
Defined benefits pension credit	0.6	1.1	1.8	3.3
Interest expense, net	(0.8)	(1.2)	(2.4)	(3.5)
Provision for income taxes	(1.9)	(2.8)	(3.6)	(5.6)
Net income from continuing operations	$ 6	$ 2.4	$ 26.5	$ 14.2

Segmental Information - Net Sal

Segmental Information - Net Sales by Geographic Region (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 91.2	$ 77.7	$ 275.4	$ 242.7
Top five countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 67.1	$ 55.1	$ 201.3	$ 179.7
Top five countries | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	73.60%	70.90%	73.10%	74.10%
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 49.4	$ 41.1	$ 151.8	$ 132.8
United States | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	54.20%	52.90%	55.10%	54.80%
U.K.
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 6.5	$ 4.1	$ 17.5	$ 13.8
U.K. | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	7.10%	5.30%	6.40%	5.70%
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 5.1	$ 3.1	$ 13.2	$ 11
Germany | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	5.60%	4.00%	4.80%	4.50%
France
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 2.6	$ 4.9	$ 9.3	$ 14
France | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	2.90%	6.30%	3.40%	5.80%
Italy
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 3.5	$ 1.9	$ 9.5	$ 8.1
Italy | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	3.80%	2.40%	3.40%	3.30%
Rest of Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 4.9	$ 5.8	$ 19	$ 18.1
Rest of Europe | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	5.40%	7.50%	6.90%	7.50%
Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 13.7	$ 12.1	$ 38.1	$ 32.9
Asia Pacific | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	15.00%	15.60%	13.80%	13.50%
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 5.5	$ 4.7	$ 17	$ 12
Other | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	6.00%	6.00%	6.20%	4.90%

Commitments and Contingencies (

Commitments and Contingencies (Details)	1 Months Ended		9 Months Ended		12 Months Ended
	Nov. 30, 2020lawsuits	Feb. 28, 2014people	Sep. 26, 2021USD ($)facility	Sep. 26, 2021GBP (£)facility	Dec. 31, 2020USD ($)	Dec. 31, 2020GBP (£)	Sep. 26, 2021GBP (£)	Jun. 30, 2021USD ($)	Mar. 31, 2021USD ($)	Dec. 31, 2020GBP (£)
Loss Contingencies [Line Items]
Number of bonding facilities for bank guarantees | facility			2	2
Borrowing capacity			$ 4,000,000
Credit facility, amount drawn			$ 0		$ 0
Number of people with minor injuries | people		3
Number of lawsuits | lawsuits	3
United Kingdom, Pounds
Loss Contingencies [Line Items]
Number of bonding facilities for bank guarantees | facility			1	1
United States of America, Dollars
Loss Contingencies [Line Items]
Number of bonding facilities for bank guarantees | facility			1	1
Committed Banking Facilities
Loss Contingencies [Line Items]
Debt maximum borrowing capacity			$ 100,000,000		150,000,000
Bonding Facility For Bank Guarantees | United Kingdom, Pounds
Loss Contingencies [Line Items]
Debt maximum borrowing capacity			6,200,000		6,100,000		£ 4,500,000
Amount drawn/utilized			800,000	£ 600,000	1,400,000	£ 1,000,000
Bonding Facility For Bank Guarantees | United States of America, Dollars
Loss Contingencies [Line Items]
Debt maximum borrowing capacity			1,500,000		1,500,000
Amount drawn/utilized			900,000		800,000
Revolving credit facility
Loss Contingencies [Line Items]
Debt maximum borrowing capacity								$ 100,000,000	$ 150,000,000
Long-term debt, gross			0		4,100,000
Borrowing capacity			100,000,000		145,900,000
Letter of Credit
Loss Contingencies [Line Items]
Debt maximum borrowing capacity			$ 1,400,000		$ 1,300,000		£ 1,000,000			£ 1,000,000

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ in Millions	Oct. 26, 2021	Sep. 26, 2021	Jun. 30, 2021	Mar. 31, 2021
Private Placement Notes
Subsequent Event [Line Items]
Debt instrument, face amount		$ 50
Revolving credit facility
Subsequent Event [Line Items]
Debt maximum borrowing capacity			$ 100	$ 150
Subsequent Event | Revolving credit facility
Subsequent Event [Line Items]
Debt maximum borrowing capacity	$ 100
Uncommitted accordion facility	50
Subsequent Event | Uncommitted Shelf Facility
Subsequent Event [Line Items]
Debt maximum borrowing capacity	$ 50