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Acquisition and disposal related gains / (costs) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended					9 Months Ended
	Jul. 31, 2020	Sep. 27, 2020	Mar. 29, 2020	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 27, 2020	Sep. 29, 2019
Business Acquisition [Line Items]
Acquisition and disposal related costs		$ 0.0	$ 0.2	$ 0.0		$ 4.6	$ (0.2)	$ (1.7)
Release of deferred consideration (recognized in acquisition-related costs)			$ 0.1
Net charge related to sale								$ 1.7
Acquisition related gains					$ 2.9
Luxfer Utlam India Private Limited
Business Acquisition [Line Items]
VIEs ownership percentage	51.00%
Luxfer Utlam India Private Limited | Maximum
Business Acquisition [Line Items]
Gain on sale	$ 0.1

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Acquisition and Disposals Related Credits (Costs)

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Business Combination, Acquisition Related Costs And Disposal Costs

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Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Release of Deferred Consideration

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

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The revenues and gains recognized recorded for each transaction with the acquiree that is recognized separately from the acquisition of assets and assumptions of liabilities in the business combination.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The difference between the carrying value and the sale price of an investment. A gain would be recognized when the sale price of the investment is greater than the carrying value of the investment. This element refers to the Gain included in earnings and not to the cash proceeds of the sale.

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