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Derivatives and Financial Instruments - Schedule of Derivative Instruments (Details) - Designated as Hedging Instrument £ in Millions	Dec. 31, 2024 GBP (£) $ / £ $ / £ $ / £ € / £	Dec. 31, 2023 GBP (£) ¥ / £ $ / £ ¥ / £ € / £ $ / £ $ / £
U.S. dollars | Sales hedges
Derivative [Line Items]
Contract totals/£m | £	£ 36.5	£ 23.5
U.S. dollars | Sales hedges | Minimum
Derivative [Line Items]
Exchange rates	1.2511	1.2159
U.S. dollars | Sales hedges | Maximum
Derivative [Line Items]
Exchange rates	1.2999	1.276
U.S. dollars | Purchase hedges
Derivative [Line Items]
Contract totals/£m | £	£ 1.2	£ 0.4
Exchange rates	1.2507
U.S. dollars | Purchase hedges | Minimum
Derivative [Line Items]
Exchange rates		1.2155
U.S. dollars | Purchase hedges | Maximum
Derivative [Line Items]
Exchange rates		1.2614
Euros | Sales hedges
Derivative [Line Items]
Contract totals/£m | £		£ 3.4
Euros | Sales hedges | Minimum
Derivative [Line Items]
Exchange rates | € / £		1.1432
Euros | Sales hedges | Maximum
Derivative [Line Items]
Exchange rates | € / £		1.1494
Euros | Purchase hedges
Derivative [Line Items]
Contract totals/£m | £	£ 0.8	£ 0.8
Exchange rates | € / £	1.2104
Euros | Purchase hedges | Minimum
Derivative [Line Items]
Exchange rates | € / £		1.1577
Euros | Purchase hedges | Maximum
Derivative [Line Items]
Exchange rates | € / £		1.1535
Canadian dollars | Sales hedges
Derivative [Line Items]
Contract totals/£m | £	£ 0.2	£ 0.3
Exchange rates	1.7969	1.6843
Canadian dollars | Purchase hedges
Derivative [Line Items]
Contract totals/£m | £	£ 15.6	£ 11.0
Canadian dollars | Purchase hedges | Minimum
Derivative [Line Items]
Exchange rates	1.7451	1.7199
Canadian dollars | Purchase hedges | Maximum
Derivative [Line Items]
Exchange rates	1.8137	1.684
Australian dollars | Purchase hedges
Derivative [Line Items]
Contract totals/£m | £	£ 1.0	£ 0.9
Exchange rates		1.8719
Australian dollars | Purchase hedges | Minimum
Derivative [Line Items]
Exchange rates	2.0073
Australian dollars | Purchase hedges | Maximum
Derivative [Line Items]
Exchange rates	2.0177
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
Chinese yuan | Purchase hedges
Derivative [Line Items]
Contract totals/£m | £		£ 1.4
Chinese yuan | Purchase hedges | Minimum
Derivative [Line Items]
Exchange rates | ¥ / £		9.0433
Chinese yuan | Purchase hedges | Maximum
Derivative [Line Items]
Exchange rates | ¥ / £		9.0440

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

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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- 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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- Details

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- Details

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- Details

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- Details

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