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Summary of Significant Accounting Policies (Details) | 3 Months Ended | 12 Months Ended |  |
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Dec. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) £ / $ | Dec. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) € / $ | Dec. 31, 2018 USD ($) £ / $ | Dec. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) € / $ | Dec. 31, 2017 USD ($) | Jan. 01, 2019 USD ($) | Dec. 28, 2018
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation |  |  |  | $ 14,100,000 |  |  | $ 17,800,000 |  | $ 17,000,000.0 |  |
Asset impairment charges, related to restructuring activities |  |  |  | 4,600,000 |  |  | 6,600,000 |  |  |  |
Impairment credit / (charges) |  |  |  | 5,200,000 |  |  |  |  |  |  |
Asset impairment charges, related to fair value adjustment in divestiture of business |  |  |  |  |  |  | 3,400,000 |  |  |  |
Impairment of review the use of long-lived assets |  |  |  |  |  |  |  |  | 1,500,000 |  |
Impairment charges | $ 5,200,000 |  |  | 5,000,000.0 |  |  | 7,200,000 |  | $ 3,700,000 |  |
Write-off in relation to the acquisition of GTM |  |  |  | 2,400,000 |  |  |  |  |  |  |
Goodwill impairment |  |  |  | 1,300,000 |  |  | 1,300,000 |  |  |  |
Restricted cash | 100,000 | $ 100,000 | $ 100,000 | 100,000 | $ 100,000 | $ 300,000 | 300,000 | $ 300,000 |  |  |
Average foreign currency exchange rate, translation |  |  | 0.7820 |  | 0.8943 | 0.7509 |  | 0.8472 |  |  |
Increase of average foreign currency exchange rate, translation |  |  | 0.05 |  | 0.05 |  |  |  |  |  |
Right-of-use assets from operating leases | 14,800,000 | 14,800,000 | $ 14,800,000 | 14,800,000 | $ 14,800,000 | $ 18,400,000 | 18,400,000 | $ 18,400,000 |  | $ 21,200,000 |
Other current liabilities | 3,300,000 | 3,300,000 | 3,300,000 | 3,300,000 | 3,300,000 | 3,500,000 | 3,500,000 | 3,500,000 |  | 3,100,000 |
Other non-current liabilities | $ 11,700,000 | $ 11,700,000 | $ 11,700,000 | $ 11,700,000 | $ 11,700,000 | 14,900,000 | 14,900,000 | 14,900,000 |  | $ 18,100,000 |
Minimum |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Incremental borrowing rate term |  | 1 year |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Incremental borrowing rate term |  | 30 years |  |  |  |  |  |  |  |  |
Machinery and equipment | Minimum |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  | 3 years |  |  |  |  |  |  |  |  |
Machinery and equipment | Maximum |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  | 25 years |  |  |  |  |  |  |  |  |
Freehold buildings | Minimum |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  | 10 years |  |  |  |  |  |  |  |  |
Freehold buildings | Maximum |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  | 33 years |  |  |  |  |  |  |  |  |
Heavy production equipment (including casting, rolling, extrusion and press equipment) | Minimum |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  | 20 years |  |  |  |  |  |  |  |  |
Heavy production equipment (including casting, rolling, extrusion and press equipment) | Maximum |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  | 25 years |  |  |  |  |  |  |  |  |
Chemical production plant and robotics | Minimum |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  | 7 years |  |  |  |  |  |  |  |  |
Chemical production plant and robotics | Maximum |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  | 10 years |  |  |  |  |  |  |  |  |
Other production machinery | Minimum |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  | 5 years |  |  |  |  |  |  |  |  |
Other production machinery | Maximum |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  | 10 years |  |  |  |  |  |  |  |  |
Furniture, fittings, storage and equipment | Minimum |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  | 3 years |  |  |  |  |  |  |  |  |
Furniture, fittings, storage and equipment | Maximum |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  | 10 years |  |  |  |  |  |  |  |  |
Computer software | Minimum |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  | 4 years |  |  |  |  |  |  |  |  |
Computer software | Maximum |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  | 7 years |  |  |  |  |  |  |  |  |
Customer relationships | Minimum |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intangible asset, useful life |  | 10 years |  |  |  |  |  |  |  |  |
Customer relationships | Maximum |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intangible asset, useful life |  | 15 years |  |  |  |  |  |  |  |  |
Technology and trading related | Minimum |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intangible asset, useful life |  | 5 years |  |  |  |  |  |  |  |  |
Technology and trading related | Maximum |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intangible asset, useful life |  | 25 years |  |  |  |  |  |  |  |  |
Luxfer Uttam India Private Limited | Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
VIEs ownership percentage | 51.00% | 51.00% | 51.00% | 51.00% | 51.00% |  |  |  |  |  |
Nikkei-MEL Co. Limited |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
VIEs ownership percentage | 50.00% | 50.00% | 50.00% | 50.00% | 50.00% |  |  |  |  |  |
Sub161 Pty Limited | Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
VIEs ownership percentage | 26.40% | 26.40% | 26.40% | 26.40% | 26.40% |  |  |  |  |  |
Luxfer Holdings NA, LLC | Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
VIEs ownership percentage |  |  |  |  |  |  |  |  |  |  | 49.00%
Escrow to disburse environmental liabilities |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restricted cash | $ 100,000 | $ 100,000 | $ 100,000 | $ 100,000 | $ 100,000 | $ 300,000 | 300,000 | $ 300,000 |  |  |
GBP |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effect of exchange rate on revenue during the year |  |  |  | 6,100,000 |  |  |  |  |  |  |
Effect of exchange rate on operating income during the year |  |  |  | 1,600,000 |  |  |  |  |  |  |
Effect of exchange on revenue per 0.05 increase in foreign exchange rate |  |  |  | 10,600,000 |  |  |  |  |  |  |
Effect of exchange on operating income per 0.05 increase in foreign exchange rate |  |  |  | 100,000 |  |  |  |  |  |  |
Euro |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effect of exchange rate on revenue during the year |  |  |  | 200,000 |  |  |  |  |  |  |
Effect of exchange rate on operating income during the year |  |  |  | 600,000 |  |  |  |  |  |  |
Effect of exchange on revenue per 0.05 increase in foreign exchange rate |  |  |  | 200,000 |  |  |  |  |  |  |
Effect of exchange on operating income per 0.05 increase in foreign exchange rate |  |  |  | $ (1,100,000) |  |  |  |  |  |  |
Measurement Input, Long-term Revenue Growth Rate |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment test, measurement input | 0.023 | 0.023 | 0.023 | 0.023 | 0.023 |  |  |  |  |  |
Measurement Input, Discount Rate | Minimum |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment test, measurement input | 0.083 | 0.083 | 0.083 | 0.083 | 0.083 |  |  |  |  |  |
Measurement Input, Discount Rate | Maximum |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment test, measurement input | 0.090 | 0.090 | 0.090 | 0.090 | 0.090 |  |  |  |  |  |
Held-for-sale | Magnesium Elektron CZ s.r.o. Subsidiary |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Adjustment in relation to the sale of business |  |  |  | $ 200,000 |  |  | $ 3,400,000 |  |  |  |

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