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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 |

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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/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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