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Acquisition and disposal related costs - Narratives (Details) - USD ($) $ in Millions		3 Months Ended	9 Months Ended
	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

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

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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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