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Revenue - Contract backlog (Details) - EUR (€) € in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Revenue |  |  |
Contract backlog as of the reported date | € 2,336 | € 1,735 | € 905
Firm |  |  |
Revenue |  |  |
Contract backlog as of the reported date | 1,906 | 1,377 | 655
Subject to exercise of counterparty options (non-contingent) |  |  |
Revenue |  |  |
Contract backlog as of the reported date | 215 | 179 | 125
Subject to exercise of counterparty options (contingent) |  |  |
Revenue |  |  |
Contract backlog as of the reported date | 215 | 179 | 125
Within 1 year |  |  |
Revenue |  |  |
Contract backlog as of the reported date | 428 | 208 | 85
Within 1 year | Firm |  |  |
Revenue |  |  |
Contract backlog as of the reported date | 372 | 176 | 81
Within 1 year | Subject to exercise of counterparty options (non-contingent) |  |  |
Revenue |  |  |
Contract backlog as of the reported date | 28 | 16 | 2
Within 1 year | Subject to exercise of counterparty options (contingent) |  |  |
Revenue |  |  |
Contract backlog as of the reported date | 28 | 16 | 2
After 1 year |  |  |
Revenue |  |  |
Contract backlog as of the reported date | 1,908 | 1,527 | 820
After 1 year | Firm |  |  |
Revenue |  |  |
Contract backlog as of the reported date | 1,534 | 1,201 | 574
After 1 year | Subject to exercise of counterparty options (non-contingent) |  |  |
Revenue |  |  |
Contract backlog as of the reported date | 187 | 163 | 123
After 1 year | Subject to exercise of counterparty options (contingent) |  |  |
Revenue |  |  |
Contract backlog as of the reported date | € 187 | € 163 | € 123

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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_TypesOfContractsAxis=cdlr_FirmContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_TypesOfContractsAxis=cdlr_OptionsContractsNonContingentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_TypesOfContractsAxis=cdlr_OptionsContractsContingentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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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: |