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v3.23.1

Financial instruments-Fair values and risk management - Credit risk (Details) - customer | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Disclosure of major customers [line items] |  |
Percentage of total trade receivables | 56.00% | 46.00%
Overall expected loss rate | 0.13% | 0.80%
Largest customer |  |
Disclosure of major customers [line items] |  |
Percentage of total trade receivables | 73.00% | 69.00%
Five largest customers |  |
Disclosure of major customers [line items] |  |
Number of largest customers | 5 |

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition The rate of expected credit losses, calculated as percentage of the gross carrying amount. Expected credit losses are the weighted average of credit losses with the respective risks of a default occurring as the weights. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 35N -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_35N&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph IG20D -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_IG20D&doctype=Implementation%20Guidance -URIDate 2022-03-24 + Details
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Balance Type: | na
Period Type: | instant

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- Definition Represents the number of customers. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition The percentage of the entity's trade receivables. + References No definition available. + Details
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Namespace Prefix: | pre_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |