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Acquisitions and disposals - Additional Information (Details) - USD ($) |  |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 28, 2018 | Dec. 05, 2017 | Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 27, 2018 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Percentage of equity interest acquired |  |  |  |  |  |  |  |  | 26.40%
Goodwill | $ 67,600,000 |  |  | $ 67,600,000 | $ 67,600,000 | $ 71,200,000 | $ 67,900,000 |  |
Equity investments fair value |  |  |  |  |  |  |  | $ 1,600,000 |
Asset impairment charges |  |  |  | 7,200,000 | 13,900,000 | 5,900,000 | 0 |  |
Consideration paid |  |  |  |  | 0 | 4,300,000 |  |  |
Acquisition-related costs |  |  |  | 4,300,000 |  |  |  |  |
Business combination, contingent consideration deferred | 900,000 |  |  | 900,000 | 900,000 | 700,000 |  |  |
Remeasurement of deferred consideration (recognized in acquisition-related costs) |  |  |  |  | 900,000 | 1,000,000 |  |  |
Business combination, contingent consideration, liability, deferred, net |  |  |  |  | 200,000 | 200,000 | 400,000 |  |
Business combination, contingent consideration, liability, current |  |  |  |  |  | 500,000 |  |  |
Business combination, undiscounted future payment, current | 900,000 |  |  | 900,000 | 900,000 |  | $ 700,000 |  |
Maximum undiscounted amount payable | 10,000,000 |  |  | $ 10,000,000 | $ 10,000,000 |  |  |  |
Luxfer Holdings NA, LLC |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Consideration of disposal |  | $ 2,200,000 |  |  |  |  |  |  |
Amount of debt instrument forgiveness |  | 2,100,000 |  |  |  |  |  |  |
Fair value of net assets of acquiree |  | 4,000,000 |  |  |  |  |  |  |
Fair value of net assets acquired |  | 2,100,000 |  |  |  |  |  |  |
Goodwill |  | 0 |  |  |  |  |  |  |
Cash acquired |  | 2,700,000 |  |  |  |  |  |  |
Inventory acquired |  | 1,100,000 |  |  |  |  |  |  |
Accounts and other receivables acquired |  | 800,000 |  |  |  |  |  |  |
Property, plant, and equipment acquired |  | 200,000 |  |  |  |  |  |  |
Accounts payable assumed from acquisition |  | 800,000 |  |  |  |  |  |  |
Intangible assets acquired |  | 0 |  |  |  |  |  |  |
Asset impairment charges |  | 2,400,000 |  |  |  |  |  |  |
Revenue of acquiree since acquisition date | $ 0 |  |  |  |  |  |  |  |
ESM Group Inc. |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Fair value of net assets acquired |  |  | $ 5,800,000 |  |  |  |  |  |
Inventory acquired |  |  | 700,000 |  |  |  |  |  |
Property, plant, and equipment acquired |  |  | 3,200,000 |  |  |  |  |  |
Consideration paid |  |  | 4,300,000 |  |  |  |  |  |
Consideration deferred |  |  | 300,000 |  |  |  |  |  |
Business combination, escrow deposit |  |  | 400,000 |  |  |  |  |  |
Bargain purchase, gain recognized |  |  | 1,200,000 |  |  |  |  |  |
Liabilities assumed form acquisition |  |  | 100,000 |  |  |  |  |  |
Acquisition-related costs |  |  | 500,000 |  |  |  |  |  |
Provisions for disbursement of environmental liabilities |  |  | 400,000 |  |  |  |  |  |
Business combination, consideration deferred |  |  |  |  |  | $ 300,000 |  |  |
ESM Group Inc. | Land and Building |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Property, plant, and equipment acquired |  |  | $ 2,000,000 |  |  |  |  |  |
Luxfer Holdings NA, LLC | Gas Transport Leasing LLC |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Consideration of disposal |  | $ 2,200,000 |  |  |  |  |  |  |
Luxfer Holdings NA, LLC |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Percentage of equity interest acquired |  | 51.00% |  |  |  |  |  |  |
Variable Interest Entity, Not Primary Beneficiary | Luxfer Holdings NA, LLC |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
VIEs ownership percentage |  |  |  |  |  |  |  | 49.00% |

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