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Revenue - Contract backlog (Details) - EUR (€) € in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Revenue |  |  |
Contract backlog as of the reported date | € 1,557 | € 780 | € 409
Within one year |  |  |
Revenue |  |  |
Contract backlog as of the reported date | 192 | 84 | 110
After one year |  |  |
Revenue |  |  |
Contract backlog as of the reported date | € 1,365 | € 696 | € 299

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- Definition Amount of orders, production or production backlog arising from contracts at the report date. + References No definition available. + Details
Name: | cdlr_ContractBacklog
Namespace Prefix: | cdlr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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
Name: | ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_ContractDurationAxis=ifrs-full_ShorttermContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ContractDurationAxis=ifrs-full_LongtermContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |