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Derivatives and Financial Instruments - Schedule of Derivative Instruments (Details) - Designated as Hedging Instrument £ in Millions	Dec. 31, 2023 GBP (£) $ / £ ¥ / £ $ / £ $ / £ € / £ ¥ / £	Dec. 31, 2022 GBP (£) € / £ ¥ / £ $ / £ $ / £ $ / £
U.S. dollars | Sales hedges
Derivative [Line Items]
Contract totals/£m | £	£ 23.5	£ 13.4
U.S. dollars | Sales hedges | Minimum
Derivative [Line Items]
Exchange rates | $ / £	1.2159	1.1207
U.S. dollars | Sales hedges | Maximum
Derivative [Line Items]
Exchange rates | $ / £	1.2760	1.2083
U.S. dollars | Purchase hedges
Derivative [Line Items]
Contract totals/£m | £	£ 0.4	£ 9.2
U.S. dollars | Purchase hedges | Minimum
Derivative [Line Items]
Exchange rates | $ / £	1.2155	1.1040
U.S. dollars | Purchase hedges | Maximum
Derivative [Line Items]
Exchange rates | $ / £	1.2614	1.2084
Euros | Sales hedges
Derivative [Line Items]
Contract totals/£m | £	£ 3.4	£ 12.8
Euros | Sales hedges | Minimum
Derivative [Line Items]
Exchange rates | € / £	1.1432	1.1234
Euros | Sales hedges | Maximum
Derivative [Line Items]
Exchange rates | € / £	1.1494	1.1468
Euros | Purchase hedges
Derivative [Line Items]
Contract totals/£m | £	£ 0.8	£ 2.6
Euros | Purchase hedges | Minimum
Derivative [Line Items]
Exchange rates | € / £	1.1577	1.1437
Euros | Purchase hedges | Maximum
Derivative [Line Items]
Exchange rates | € / £	1.1535	1.2240
Canadian dollars | Sales hedges
Derivative [Line Items]
Contract totals/£m | £	£ 0.3	£ 0.1
Exchange rates | $ / £	1.6843
Canadian dollars | Sales hedges | Minimum
Derivative [Line Items]
Exchange rates | $ / £		1.6320
Canadian dollars | Purchase hedges
Derivative [Line Items]
Contract totals/£m | £	£ 11.0	£ 9.5
Canadian dollars | Purchase hedges | Minimum
Derivative [Line Items]
Exchange rates | $ / £	1.7199	1.6796
Canadian dollars | Purchase hedges | Maximum
Derivative [Line Items]
Exchange rates | $ / £	1.6840	1.6239
Australian dollars | Purchase hedges
Derivative [Line Items]
Contract totals/£m | £	£ 0.9	£ 1.0
Exchange rates | $ / £	1.8719	1.7787
Chinese yuan | Purchase hedges
Derivative [Line Items]
Contract totals/£m | £	£ 1.4	£ 1.6
Chinese yuan | Purchase hedges | Minimum
Derivative [Line Items]
Exchange rates | ¥ / £	9.0433	8.3906
Chinese yuan | Purchase hedges | Maximum
Derivative [Line Items]
Exchange rates | ¥ / £	9.0440	8.4126
Japanese Yen | Sales hedges
Derivative [Line Items]
Contract totals/£m | £	£ 0.2
Japanese Yen | Sales hedges | Minimum
Derivative [Line Items]
Exchange rates | ¥ / £	179.3673
Japanese Yen | Sales hedges | Maximum
Derivative [Line Items]
Exchange rates | ¥ / £	185.6455

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
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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480237/815-40-50-5

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X

- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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