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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

X

- Definition

Amount of orders, production or production backlog arising from contracts at the report date.

+ References

No definition available.

+ Details

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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

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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