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Employee benefits - Accumulated benefit obligation less than plan assets (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Pension Plans |  |
Defined Benefit Plan Disclosure |  |
Project benefit obligation | $ 599,829 | $ 0
Accumulated benefit obligation | 599,829 | 0
Fair value of plan assets | 623,233 | 0
OPEB Plan |  |
Defined Benefit Plan Disclosure |  |
Project benefit obligation | 0 | 0
Accumulated benefit obligation | 0 | 0
Fair value of plan assets | $ 0 | $ 0

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- Definition If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations which are less than plan assets as of the measurement date of each statement of financial position presented. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with accumulated benefit obligations which are less than plan assets as of the measurement date of each statement of financial position presented. + References No definition available. + Details
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- Definition If aggregate disclosures are presented, the aggregate projected benefit obligation for pension plans with accumulated benefit obligations which are less than plan assets as of the measurement date of each statement of financial position presented. + 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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