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Digital assets - Schedule of Holdings of Digital Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
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Digital assets - Bitcoin |  |
Alternative Assets [Line Items] |  |
Digital assets - Bitcoin | $ 44,629 | $ 0

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- Definition Alternative Assets [Line Items] + References No definition available. + Details
Name: | pre_AlternativeAssetsLineItems
Namespace Prefix: | pre_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Digital Assets, Cost + References No definition available. + Details
Name: | pre_DigitalAssetsCost
Namespace Prefix: | pre_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | srt_CryptoAssetAxis=pre_BitcoinMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |