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Derivatives and Financial Instruments - Schedule of Derivative Instruments (Details) - Designated as Hedging Instrument £ in Millions | Dec. 31, 2022 GBP (£) $ / £ $ / £ $ / £ € / £ ¥ / £ ¥ / £ | Dec. 31, 2021 GBP (£) $ / £ $ / £ € / £ ¥ / £ $ / £ ¥ / £
--- | --- | ---
U.S. dollars | Sales hedges |  |
Derivative [Line Items] |  |
Contract totals/£m | £ 13.4 | £ 5.0
U.S. dollars | Sales hedges | Minimum |  |
Derivative [Line Items] |  |
Exchange rates | $ / £ | 1.1207 | 1.3455
U.S. dollars | Sales hedges | Maximum |  |
Derivative [Line Items] |  |
Exchange rates | $ / £ | 1.2083 | 1.3788
U.S. dollars | Purchase hedges |  |
Derivative [Line Items] |  |
Contract totals/£m | £ 9.2 | £ 4.5
U.S. dollars | Purchase hedges | Minimum |  |
Derivative [Line Items] |  |
Exchange rates | 1.1040 | 1.3451
U.S. dollars | Purchase hedges | Maximum |  |
Derivative [Line Items] |  |
Exchange rates | 1.2084 | 1.3781
Euros | Sales hedges |  |
Derivative [Line Items] |  |
Contract totals/£m | £ 12.8 | £ 9.8
Euros | Sales hedges | Minimum |  |
Derivative [Line Items] |  |
Exchange rates | € / £ | 1.1234 | 1.1697
Euros | Sales hedges | Maximum |  |
Derivative [Line Items] |  |
Exchange rates | € / £ | 1.1468 | 1.1906
Euros | Purchase hedges |  |
Derivative [Line Items] |  |
Contract totals/£m | £ 2.6 | £ 3.5
Euros | Purchase hedges | Minimum |  |
Derivative [Line Items] |  |
Exchange rates | € / £ | 1.1437 | 1.1812
Euros | Purchase hedges | Maximum |  |
Derivative [Line Items] |  |
Exchange rates | € / £ | 1.2240 | 1.1662
Canadian dollars | Sales hedges |  |
Derivative [Line Items] |  |
Contract totals/£m | £ 0.1 |
Exchange rates | ¥ / £ | 1.6320 |
Canadian dollars | Purchase hedges |  |
Derivative [Line Items] |  |
Contract totals/£m | £ 9.5 | £ 7.5
Canadian dollars | Purchase hedges | Minimum |  |
Derivative [Line Items] |  |
Exchange rates | $ / £ | 1.6796 | 1.7172
Canadian dollars | Purchase hedges | Maximum |  |
Derivative [Line Items] |  |
Exchange rates | $ / £ | 1.6239 | 1.6762
Australian dollars | Purchase hedges |  |
Derivative [Line Items] |  |
Contract totals/£m | £ 1.0 | £ 0.9
Exchange rates | $ / £ | 1.7787 | 1.8598
Japanese Yen | Sales hedges |  |
Derivative [Line Items] |  |
Contract totals/£m |  | £ 0.1
Japanese Yen | Sales hedges | Minimum |  |
Derivative [Line Items] |  |
Exchange rates | ¥ / £ |  | 155.2443
Japanese Yen | Sales hedges | Maximum |  |
Derivative [Line Items] |  |
Exchange rates | ¥ / £ |  | 156.6793
Chinese yuan | Purchase hedges |  |
Derivative [Line Items] |  |
Contract totals/£m | £ 1.6 | £ 1.5
Exchange rates | ¥ / £ |  | 8.6126
Chinese yuan | Purchase hedges | Minimum |  |
Derivative [Line Items] |  |
Exchange rates | ¥ / £ | 8.3906 |
Chinese yuan | Purchase hedges | Maximum |  |
Derivative [Line Items] |  |
Exchange rates | ¥ / £ | 8.4126 |

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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 No definition available. + Details
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- Details
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- Details
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