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Basis of accounting, Currency translation rates (Detail) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
1 CHF |  |  |  |  |  |
Foreign Exchange Rates [Line Items] |  |  |  |  |  |
Closing exchange rate | 1.12 | 1.09 | 1.05 | 1.12 | 1.05 | 1.08
Average rate | 1.11 | 1.08 | 1.04 | 1.11 | 1.06 |
1 EUR |  |  |  |  |  |
Foreign Exchange Rates [Line Items] |  |  |  |  |  |
Closing exchange rate | 1.09 | 1.08 | 1.05 | 1.09 | 1.05 | 1.07
Average rate | 1.09 | 1.08 | 1.06 | 1.09 | 1.09 |
1 GBP |  |  |  |  |  |
Foreign Exchange Rates [Line Items] |  |  |  |  |  |
Closing exchange rate | 1.27 | 1.23 | 1.22 | 1.27 | 1.22 | 1.21
Average rate | 1.27 | 1.22 | 1.25 | 1.24 | 1.29 |
100 JPY |  |  |  |  |  |
Foreign Exchange Rates [Line Items] |  |  |  |  |  |
Closing exchange rate | 0.69 | 0.75 | 0.74 | 0.69 | 0.74 | 0.76
Average rate | 0.71 | 0.75 | 0.76 | 0.73 | 0.80 |

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- Definition The average exchange rate used by the entity. Exchange rate is the ratio of exchange for two currencies. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_112_c&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_112_c&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Details
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- Details
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