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Related-Party Transactions (Details)	12 Months Ended
	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2018 £ / shares	Dec. 31, 2018 AUD ($) shares	Dec. 28, 2018	Dec. 31, 2017 £ / shares	Dec. 31, 2017 AUD ($) shares	Dec. 31, 2015
Related Party Transaction [Line Items]
Percentage of share capital acquired								26.40%
FTI Consulting | President
Related Party Transaction [Line Items]
Related party transaction, amounts of transaction		$ 100,000
Luxfer Uttam India Private Limited | Equity Method Investee
Related Party Transaction [Line Items]
Equity method investment, ownership percentage	51.00%			51.00%
Accounts receivable, related parties	$ 1,100,000	2,300,000
Related party transaction, net amounts receivable	$ 900,000	900,000
Nikkei-MEL Co. Limited | Equity Method Investee
Related Party Transaction [Line Items]
Equity method investment, ownership percentage	50.00%			50.00%
Luxfer Holdings NA, LLC | Equity Method Investee
Related Party Transaction [Line Items]
Equity method investment, ownership percentage	49.00%			49.00%
Accounts receivable, related parties	$ 0	900,000
Related party transaction, net amounts receivable	0	4,700,000
Debt investments amount	0	900,000
Cherokee Properties Inc. | President
Related Party Transaction [Line Items]
Related party transaction, amounts of transaction	1,000,000	1,000,000
Gas Cylinders | Luxfer Uttam India Private Limited | Equity Method Investee
Related Party Transaction [Line Items]
Sales to related parties	1,700,000	1,900,000
Related party transaction, amounts of transaction	1,600,000	0
Gas Cylinders | Luxfer Holdings NA, LLC | Equity Method Investee
Related Party Transaction [Line Items]
Sales to related parties	600,000	5,000,000
Interest income from related party	400,000	300,000
Elektron | Nikkei-MEL Co. Limited | Equity Method Investee
Related Party Transaction [Line Items]
Sales to related parties	$ 900,000	$ 1,200,000
Ordinary shares
Related Party Transaction [Line Items]
Common stock, par value (in GBP per share) | £ / shares			£ 0.50			£ 0.50
Ordinary shares | Executive Leadership Team
Related Party Transaction [Line Items]
Number of common stock owned by related parties (in shares) | shares	237,161	170,297		237,161			170,297
Number of awards held by related parties (in shares) | shares	600,528	316,797		600,528			316,797
Ordinary shares | Stone Canyon Industries LLC
Related Party Transaction [Line Items]
Number of common stock owned by related parties (in shares) | shares	0	570,000		0			570,000
Luxfer Holdings NA, LLC
Related Party Transaction [Line Items]
Percentage of share capital acquired					51.00%
Sub161 Pty Limited | Equity Method Investee
Related Party Transaction [Line Items]
Sales to related parties	$ 0	$ 0
Accounts receivable, related parties				$ 0			$ 0

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