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Derivatives and Financial Instruments - Schedule of Derivative Instruments (Details) - Designated as Hedging Instrument £ in Millions | Dec. 31, 2019 GBP (£) $ / £ € / £ $ / £ | Dec. 31, 2018 GBP (£) Kč / £ € / £ $ / £ $ / £
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U.S. dollars | Sales hedges |  |
Derivative [Line Items] |  |
Contract totals/£m | £ | £ 0.1 | £ 4.8
Exchange rates | $ / £ | 1.2914 |
U.S. dollars | Sales hedges | Minimum |  |
Derivative [Line Items] |  |
Exchange rates | $ / £ |  | 1.2519
U.S. dollars | Sales hedges | Maximum |  |
Derivative [Line Items] |  |
Exchange rates | $ / £ |  | 1.3419
U.S. dollars | Purchase hedges |  |
Derivative [Line Items] |  |
Contract totals/£m | £ | £ 1.3 | £ 7.5
Exchange rates | $ / £ | 1.3228 |
U.S. dollars | Purchase hedges | Minimum |  |
Derivative [Line Items] |  |
Exchange rates | $ / £ |  | 1.2609
U.S. dollars | Purchase hedges | Maximum |  |
Derivative [Line Items] |  |
Exchange rates | $ / £ |  | 1.3380
Euros | Sales hedges |  |
Derivative [Line Items] |  |
Contract totals/£m | £ | £ 7.6 | £ 7.2
Euros | Sales hedges | Minimum |  |
Derivative [Line Items] |  |
Exchange rates | € / £ | 1.1551 | 1.0949
Euros | Sales hedges | Maximum |  |
Derivative [Line Items] |  |
Exchange rates | € / £ | 1.1750 | 1.1702
Euros | Purchase hedges |  |
Derivative [Line Items] |  |
Contract totals/£m | £ | £ 0.8 | £ 1.7
Exchange rates | € / £ | 1.1663 |
Euros | Purchase hedges | Minimum |  |
Derivative [Line Items] |  |
Exchange rates | € / £ |  | 1.1074
Euros | Purchase hedges | Maximum |  |
Derivative [Line Items] |  |
Exchange rates | € / £ |  | 1.1221
Canadian dollars | Purchase hedges |  |
Derivative [Line Items] |  |
Contract totals/£m | £ | £ 7.0 | £ 2.9
Canadian dollars | Purchase hedges | Minimum |  |
Derivative [Line Items] |  |
Exchange rates | 1.7137 | 1.7039
Canadian dollars | Purchase hedges | Maximum |  |
Derivative [Line Items] |  |
Exchange rates | 1.7664 | 1.7416
Czech koruna | Purchase hedges |  |
Derivative [Line Items] |  |
Contract totals/£m | £ |  | £ 0.1
Exchange rates | Kč / £ |  | 28.449
Japan, Yen | Sales hedges |  |
Derivative [Line Items] |  |
Contract totals/£m | £ | £ 0.1 |
Exchange rates | $ / £ | 142.86 |

X
- Definition Derivative, Notional Amount1 + References No definition available. + Details
Name: | lxfr_DerivativeNotionalAmount1
Namespace Prefix: | lxfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Contractual rate at which a foreign currency can be purchased or sold. + References No definition available. + Details
Name: | us-gaap_DerivativeForwardExchangeRate1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_DesignatedAsHedgingInstrumentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_CurrencyAxis=currency_USD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=lxfr_ForeignExchangeForwardSalesHedgesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=lxfr_ForeignExchangeForwardPurchaseHedgesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_CurrencyAxis=currency_EUR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_CurrencyAxis=currency_CAD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_CurrencyAxis=currency_CZK
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |