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Property, plant and equipment (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Property, plant and equipment | $ 127,900,000 | $ 136,000,000 |
Additions | 9,200,000 | 16,500,000 | $ 15,300,000
Impairment | 5,000,000 | 0 | 1,700,000
Provided during the year |  | 16,700,000 | 16,600,000
Property, plant and equipment | 125,500,000 | 127,900,000 | 136,000,000
Assets under finance leases | 0 | 0 |
Cost |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Property, plant and equipment | 349,000,000 | 387,400,000 |
Additions | 9,200,000 | 16,500,000 |
Acquired via acquisition | 5,200,000 |  |
Disposals | (4,900,000) | (26,800,000) |
Transfers |  | 0 |
Exchange difference | 18,300,000 | (28,100,000) |
Property, plant and equipment | 376,800,000 | 349,000,000 | 387,400,000
Accumulated depreciation, amortisation and impairment |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Property, plant and equipment | (221,100,000) | (251,400,000) |
Disposals | (4,700,000) | (25,600,000) |
Impairment | 5,000,000 |  |
Transfers |  | 0 |
Exchange difference | (13,200,000) | 21,400,000 |
Provided during the year | 16,700,000 | 16,700,000 |
Property, plant and equipment | (251,300,000) | (221,100,000) | (251,400,000)
Freehold |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Property, plant and equipment | 29,800,000 | 36,000,000 |
Property, plant and equipment | 29,900,000 | 29,800,000 | 36,000,000
Freehold | Cost |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Property, plant and equipment | 56,400,000 | 56,100,000 |
Additions | 900,000 | 1,900,000 |
Acquired via acquisition | 2,000,000 |  |
Disposals | (100,000) | (3,800,000) |
Transfers |  | 3,800,000 |
Exchange difference | 3,200,000 | (1,600,000) |
Property, plant and equipment | 62,400,000 | 56,400,000 | 56,100,000
Freehold | Accumulated depreciation, amortisation and impairment |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Property, plant and equipment | (26,600,000) | (20,100,000) |
Disposals | (100,000) | (2,800,000) |
Impairment | 2,500,000 |  |
Transfers |  | (7,900,000) |
Exchange difference | (1,300,000) | 600,000 |
Provided during the year | 2,200,000 | 2,000,000 |
Property, plant and equipment | (32,500,000) | (26,600,000) | (20,100,000)
Long leasehold |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Property, plant and equipment | 2,800,000 | 2,500,000 |
Property, plant and equipment | 2,700,000 | 2,800,000 | 2,500,000
Long leasehold | Cost |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Property, plant and equipment | 5,900,000 | 6,400,000 |
Additions | 300,000 | 600,000 |
Acquired via acquisition | 0 |  |
Disposals | (100,000) | 0 |
Transfers |  | (200,000) |
Exchange difference | 100,000 | (900,000) |
Property, plant and equipment | 6,200,000 | 5,900,000 | 6,400,000
Long leasehold | Accumulated depreciation, amortisation and impairment |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Property, plant and equipment | (3,100,000) | (3,900,000) |
Disposals | (100,000) | 0 |
Impairment | 0 |  |
Transfers |  | 500,000 |
Exchange difference | (200,000) | 600,000 |
Provided during the year | 300,000 | 300,000 |
Property, plant and equipment | (3,500,000) | (3,100,000) | (3,900,000)
Short leasehold |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Property, plant and equipment | 5,000,000 | 5,600,000 |
Property, plant and equipment | 5,500,000 | 5,000,000 | 5,600,000
Short leasehold | Cost |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Property, plant and equipment | 10,500,000 | 10,300,000 |
Additions | 900,000 | 500,000 |
Acquired via acquisition | 0 |  |
Disposals | 0 | 0 |
Transfers |  | 0 |
Exchange difference | 800,000 | (300,000) |
Property, plant and equipment | 12,200,000 | 10,500,000 | 10,300,000
Short leasehold | Accumulated depreciation, amortisation and impairment |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Property, plant and equipment | (5,500,000) | (4,700,000) |
Disposals | 0 | 0 |
Impairment | 0 |  |
Transfers |  | (200,000) |
Exchange difference | (300,000) | 200,000 |
Provided during the year | 900,000 | 800,000 |
Property, plant and equipment | (6,700,000) | (5,500,000) | (4,700,000)
Plant and equipment |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Property, plant and equipment | 90,300,000 | 91,900,000 |
Property, plant and equipment | 87,400,000 | 90,300,000 | 91,900,000
Plant and equipment | Cost |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Property, plant and equipment | 276,200,000 | 314,600,000 |
Additions | 7,100,000 | 13,500,000 |
Acquired via acquisition | 3,200,000 |  |
Disposals | (4,700,000) | (23,000,000) |
Transfers |  | (3,600,000) |
Exchange difference | 14,200,000 | (25,300,000) |
Property, plant and equipment | 296,000,000 | 276,200,000 | 314,600,000
Plant and equipment | Accumulated depreciation, amortisation and impairment |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Property, plant and equipment | (185,900,000) | (222,700,000) |
Disposals | (4,500,000) | (22,800,000) |
Impairment | 2,500,000 |  |
Transfers |  | 7,600,000 |
Exchange difference | (11,400,000) | 20,000,000 |
Provided during the year | 13,300,000 | 13,600,000 |
Property, plant and equipment | (208,600,000) | $ (185,900,000) | $ (222,700,000)
Luxfer Czech Republic Operating Segment | Accumulated depreciation, amortisation and impairment |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Impairment | 2,200,000 |  |
Luxfer Magtech operations | Accumulated depreciation, amortisation and impairment |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Impairment | 1,300,000 |  |
Operating segments | Accumulated depreciation, amortisation and impairment |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Impairment | $ 1,500,000 |  |

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- Definition The increase in property, plant and equipment resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_iii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of additions to property, plant and equipment other than those acquired through business combinations. [Refer: Business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of depreciation expense. Depreciation is the systematic allocation of depreciable amounts of tangible assets over their useful lives. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Impairment loss recognised in profit or loss; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_v&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 98 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_98_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in property, plant and equipment resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause viii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_viii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in property, plant and equipment resulting from transfers from construction in progress. [Refer: Property, plant and equipment; Construction in progress] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_a&doctype=Standard -URIDate 2017-03-09 + Details
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