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Derivatives and Financial Instruments - Schedule of Derivative Instruments (Details) - Designated as Hedging Instrument £ in Millions	Dec. 31, 2022 GBP (£) $ / £ $ / £ $ / £ € / £ ¥ / £ ¥ / £	Dec. 31, 2021 GBP (£) $ / £ $ / £ € / £ ¥ / £ $ / £ ¥ / £
U.S. dollars | Sales hedges
Derivative [Line Items]
Contract totals/£m	£ 13.4	£ 5.0
U.S. dollars | Sales hedges | Minimum
Derivative [Line Items]
Exchange rates | $ / £	1.1207	1.3455
U.S. dollars | Sales hedges | Maximum
Derivative [Line Items]
Exchange rates | $ / £	1.2083	1.3788
U.S. dollars | Purchase hedges
Derivative [Line Items]
Contract totals/£m	£ 9.2	£ 4.5
U.S. dollars | Purchase hedges | Minimum
Derivative [Line Items]
Exchange rates	1.1040	1.3451
U.S. dollars | Purchase hedges | Maximum
Derivative [Line Items]
Exchange rates	1.2084	1.3781
Euros | Sales hedges
Derivative [Line Items]
Contract totals/£m	£ 12.8	£ 9.8
Euros | Sales hedges | Minimum
Derivative [Line Items]
Exchange rates | € / £	1.1234	1.1697
Euros | Sales hedges | Maximum
Derivative [Line Items]
Exchange rates | € / £	1.1468	1.1906
Euros | Purchase hedges
Derivative [Line Items]
Contract totals/£m	£ 2.6	£ 3.5
Euros | Purchase hedges | Minimum
Derivative [Line Items]
Exchange rates | € / £	1.1437	1.1812
Euros | Purchase hedges | Maximum
Derivative [Line Items]
Exchange rates | € / £	1.2240	1.1662
Canadian dollars | Sales hedges
Derivative [Line Items]
Contract totals/£m	£ 0.1
Exchange rates | ¥ / £	1.6320
Canadian dollars | Purchase hedges
Derivative [Line Items]
Contract totals/£m	£ 9.5	£ 7.5
Canadian dollars | Purchase hedges | Minimum
Derivative [Line Items]
Exchange rates | $ / £	1.6796	1.7172
Canadian dollars | Purchase hedges | Maximum
Derivative [Line Items]
Exchange rates | $ / £	1.6239	1.6762
Australian dollars | Purchase hedges
Derivative [Line Items]
Contract totals/£m	£ 1.0	£ 0.9
Exchange rates | $ / £	1.7787	1.8598
Japanese Yen | Sales hedges
Derivative [Line Items]
Contract totals/£m		£ 0.1
Japanese Yen | Sales hedges | Minimum
Derivative [Line Items]
Exchange rates | ¥ / £		155.2443
Japanese Yen | Sales hedges | Maximum
Derivative [Line Items]
Exchange rates | ¥ / £		156.6793
Chinese yuan | Purchase hedges
Derivative [Line Items]
Contract totals/£m	£ 1.6	£ 1.5
Exchange rates | ¥ / £		8.6126
Chinese yuan | Purchase hedges | Minimum
Derivative [Line Items]
Exchange rates | ¥ / £	8.3906
Chinese yuan | Purchase hedges | Maximum
Derivative [Line Items]
Exchange rates | ¥ / £	8.4126

X

- Definition

Derivative, Notional Amount1

+ References

No definition available.

+ Details

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Namespace Prefix:	lxfr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Contractual rate at which a foreign currency can be purchased or sold.

+ References

No definition available.

+ Details

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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

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Data Type:	xbrli:stringItemType
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X

- Details

Name:	us-gaap_HedgingDesignationAxis=us-gaap_DesignatedAsHedgingInstrumentMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	srt_CurrencyAxis=currency_USD
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
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Balance Type:
Period Type:

X

- Details

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Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

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- Details

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Namespace Prefix:
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Balance Type:
Period Type:

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_CurrencyAxis=currency_CNY
Namespace Prefix:
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Balance Type:
Period Type: