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v3.20.1

Derivatives and Financial Instruments - Schedule of Derivative Instruments (Details) - Designated as Hedging Instrument ¥ in Millions, £ in Millions | Mar. 29, 2020 GBP (£) € / £ $ / £ $ / £ | Dec. 31, 2019 GBP (£) € / £ ¥ / £ $ / £ $ / £ | Dec. 31, 2019 JPY (¥) € / £ ¥ / £ $ / £ $ / £
--- | --- | --- | ---
U.S. dollars | Sales hedges |  |  |
Derivative [Line Items] |  |  |
Contract totals/£m | £ | £ 6.8 | £ 0.1 |
Exchange rates |  | 1.2914 | 1.2914
U.S. dollars | Sales hedges | Minimum |  |  |
Derivative [Line Items] |  |  |
Exchange rates | 1.1617 |  |
U.S. dollars | Sales hedges | Maximum |  |  |
Derivative [Line Items] |  |  |
Exchange rates | 1.2281 |  |
U.S. dollars | Purchase hedges |  |  |
Derivative [Line Items] |  |  |
Contract totals/£m | £ | £ 1.4 | £ 1.3 |
Exchange rates |  | 1.3228 | 1.3228
U.S. dollars | Purchase hedges | Minimum |  |  |
Derivative [Line Items] |  |  |
Exchange rates | 1.2303 |  |
U.S. dollars | Purchase hedges | Maximum |  |  |
Derivative [Line Items] |  |  |
Exchange rates | 1.3132 |  |
Euros | Sales hedges |  |  |
Derivative [Line Items] |  |  |
Contract totals/£m | £ | £ 9.9 | £ 7.6 |
Euros | Sales hedges | Minimum |  |  |
Derivative [Line Items] |  |  |
Exchange rates | € / £ | 1.1151 | 1.5510 | 1.5510
Euros | Sales hedges | Maximum |  |  |
Derivative [Line Items] |  |  |
Exchange rates | € / £ | 1.1914 | 1.1750 | 1.1750
Euros | Purchase hedges |  |  |
Derivative [Line Items] |  |  |
Contract totals/£m | £ | £ 0.8 | £ 0.8 |
Exchange rates | € / £ |  | 1.1663 | 1.1663
Euros | Purchase hedges | Minimum |  |  |
Derivative [Line Items] |  |  |
Exchange rates | € / £ | 1.1663 |  |
Canadian dollars | Purchase hedges |  |  |
Derivative [Line Items] |  |  |
Contract totals/£m | £ | £ 6.8 | £ 7.0 |
Canadian dollars | Purchase hedges | Minimum |  |  |
Derivative [Line Items] |  |  |
Exchange rates | 1.7018 | 1.7137 | 1.7137
Canadian dollars | Purchase hedges | Maximum |  |  |
Derivative [Line Items] |  |  |
Exchange rates | 1.7240 | 1.7664 | 1.7664
Japan, Yen | Sales hedges |  |  |
Derivative [Line Items] |  |  |
Contract totals/£m | ¥ |  |  | ¥ 0.1
Exchange rates | ¥ / £ |  | 142.8600 | 142.8600

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- 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

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- 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
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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: |

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- Details
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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
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Balance Type: |
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- Details
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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: |

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

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