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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 (£) $ / £ $ / £ € / £ $ / £
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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

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- Definition Contractual rate at which a foreign currency can be purchased or sold. + References No definition available. + Details
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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 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 + Details
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- Details
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