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Acquisitions and disposals - Additional Information (Details) ₨ in Millions, $ in Millions	1 Months Ended		12 Months Ended
	Sep. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 INR (₨)	Dec. 31, 2019 USD ($)	Mar. 28, 2021 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain/ loss on disposition			$ 6.6	$ 0.0		$ 0.0
Acquisition-related costs			1.5			0.9
Merger and acquisition exploration costs				0.4
Acquisitions and disposals costs			1.5	$ 0.0		1.4
Reimbursement of costs						3.5
Remeasurement of deferred contingent consideration						0.1
Luxfer Utlam India Private Limited
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
VIEs ownership percentage				51.00%	51.00%
Proceeds from sale of joint venture partner				$ 1.8	₨ 137.4
Luxfer Utlam India Private Limited | Maximum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of investments				$ 0.1
Discontinued Operations, Disposed of by Sale | U.S Aluminum Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain/ loss on disposition		$ 7.1	$ 7.1
Net proceeds		$ 20.2					$ 20.2
Discontinued Operations, Disposed of by Sale | Superform U.K. Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain/ loss on disposition	$ (0.5)
Net proceeds	4.0
Net proceeds	3.0
Deferred consideration payable	$ 1.0
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Magnesium Elektron CZ s.r.o. Subsidiary
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gain on disposal						$ 2.9

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