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Expenses by nature - Cost of sales (Details) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Expenses by nature
Right-of-use asset depreciation	€ 235	€ 30
Insurance	2,754	1,573	€ 1,933
Vessel depreciation	53,696	22,484	21,664
Impairment of property, plant and equipment	0	5,000
Crewing costs paid to a related party and an external party			61
Offshore employee compensation	32,285	15,921	13,089
Fuel and oil	2,976	711	1,113
Maintenance	7,886	5,121	4,039
Messing costs	2,948	1,448	1,428
Seafarer travel	7,110	2,835	2,589
Specific charter costs	10,776	4,052	2,623
Utilities	1,308	389	689
Other operating expenses	2,254	294	309
Total cost of sales	€ 124,228	€ 59,858	€ 49,537

X

- Definition

The amount of crewing costs incurred by the company.

+ References

No definition available.

+ Details

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Namespace Prefix:	cdlr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of employee benefit expenses, classified as cost of sales.

+ References

No definition available.

+ Details

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Namespace Prefix:	cdlr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

The amount of maintenance costs incurred by the company.

+ References

No definition available.

+ Details

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Namespace Prefix:	cdlr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of messing costs incurred by the company.

+ References

No definition available.

+ Details

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Namespace Prefix:	cdlr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of expenses incurred by the company for seafarer travel.

+ References

No definition available.

+ Details

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Namespace Prefix:	cdlr_
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Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of specific charter costs incurred by the company.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of depreciation expenses for vessels, included in cost of sales.

+ References

No definition available.

+ Details

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Namespace Prefix:	cdlr_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

X

- Definition

The amount of all expenses directly or indirectly attributed to the goods or services sold. Attributed expenses include, but are not limited to, costs previously included in the measurement of inventory that has now been sold, such as depreciation and maintenance of factory buildings and equipment used in the production process, unallocated production overheads, and abnormal amounts of production costs of inventories.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Balance Type:	debit
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X

- Definition

The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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X

- References

No definition available.

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Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

The amount of expense arising from the consumption of fuel.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Number 1
-IssueDate 2024-01-01
-Paragraph 112
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Balance Type:	debit
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X

- Definition

The amount of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Impairment loss recognised in profit or loss; Property, plant and equipment]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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X

- Definition

The amount of expense arising from purchased insurance.

+ References

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-Number 1
-IssueDate 2024-01-01
-Paragraph 112
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Balance Type:	debit
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X

- Definition

The amount of miscellaneous other operating expenses. [Refer: Other operating income (expense)]

+ References

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-Number 1
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Balance Type:	debit
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X

- Definition

The amount of expense arising from purchased utilities.

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