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Exchange rates | 12 Months Ended
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Dec. 31, 2023
Text Block [Abstract] |
Exchange rates | 1. Exchange rates
|  |  |  |  | 2023 |  |  |  |  |  | 2022 |  |  |  |  |  | 2021
$1 equivalent |  |  |  |  | Average |  |  |  |  |  | Closing |  |  |  |  |  | Average |  |  |  |  |  | Closing |  |  |  |  |  | Average |  |  |  |  |  | Closing
Sterling |  |  |  |  |  |  | £0.80 |  |  |  |  |  |  |  | £0.78 |  |  |  |  |  |  |  | £0.81 |  |  |  |  |  |  |  | £0.83 |  |  |  |  |  |  |  | £0.73 |  |  |  |  |  |  | £0.74
Euro |  |  |  |  |  |  | €0.92 |  |  |  |  |  |  |  | €0.90 |  |  |  |  |  |  |  | € 0.95 |  |  |  |  |  |  |  | € 0.94 |  |  |  |  |  |  |  | € 0.85 |  |  |  |  |  |  | € 0.88

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- Definition The entire disclosure for the effect of changes in foreign exchange rates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 21 -IssueDate 2023-01-01 -Section Disclosure -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=21&code=ifrs-tx-2023-en-r&doctype=Standard&dita_xref=IAS21_g51-57_TI -URIDate 2023-03-23 + Details
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- Definition Text block [abstract] + References No definition available. + Details
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