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Derivatives and Financial Instruments - Schedule of Derivative Instruments (Details) - Designated as Hedging Instrument £ in Millions	Dec. 31, 2025 GBP (£) $ / £ € / £ $ / £ $ / £	Dec. 31, 2024 GBP (£) $ / £ $ / £ € / £ $ / £
U.S. Dollars | Sales hedges
Derivative [Line Items]
Contract totals/£m | £	£ 29.4	£ 36.5
U.S. Dollars | Sales hedges | Minimum
Derivative [Line Items]
Exchange rates	1.3098	1.2511
U.S. Dollars | Sales hedges | Maximum
Derivative [Line Items]
Exchange rates	1.3521	1.2999
U.S. Dollars | Purchase hedges
Derivative [Line Items]
Contract totals/£m | £		£ 1.2
U.S. Dollars | Purchase hedges | Minimum
Derivative [Line Items]
Exchange rates		1.2507
Australian Dollars | Sales hedges
Derivative [Line Items]
Contract totals/£m | £	£ 1.2
Australian Dollars | Sales hedges | Minimum
Derivative [Line Items]
Exchange rates | € / £	2.0028
Australian Dollars | Sales hedges | Maximum
Derivative [Line Items]
Exchange rates | € / £	2.0297
Australian Dollars | Purchase hedges
Derivative [Line Items]
Contract totals/£m | £	£ 2.2	£ 1.0
Australian Dollars | Purchase hedges | Minimum
Derivative [Line Items]
Exchange rates	2.0111	2.0073
Australian Dollars | Purchase hedges | Maximum
Derivative [Line Items]
Exchange rates	2.0111	2.0177
Canadian Dollars | Sales hedges
Derivative [Line Items]
Contract totals/£m | £	£ 0.3	£ 0.2
Exchange rates	1.8371	1.7969
Canadian Dollars | Purchase hedges
Derivative [Line Items]
Contract totals/£m | £	£ 15.6	£ 15.6
Canadian Dollars | Purchase hedges | Minimum
Derivative [Line Items]
Exchange rates	1.8454	1.7451
Canadian Dollars | Purchase hedges | Maximum
Derivative [Line Items]
Exchange rates	1.8305	1.8137
Euros | Purchase hedges
Derivative [Line Items]
Contract totals/£m | £	£ 0.8	£ 0.8
Exchange rates | € / £	1.1445
Euros | Purchase hedges | Minimum
Derivative [Line Items]
Exchange rates | € / £		1.2104

X

- Definition

Derivative, Notional Amount1

+ References

No definition available.

+ Details

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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/2009/role/commonPracticeRef
-Topic 815
-SubTopic 20
-Name Accounting Standards Codification
-Section 25
-Paragraph 6A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480682/815-20-25-6A

Reference 2: 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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