Revenue - Additional Information (Details) € in Thousands	12 Months Ended
Dec. 31, 2023 EUR (€) item	Dec. 31, 2022 EUR (€)	Dec. 31, 2021 EUR (€)
Revenue
Revenue	€ 108,622	€ 106,424	€ 60,938
Revenue not from contracts with customers	€ 79,000	91,000	43,000
Number of windfarm installation vessels \| item	4
Contract backlog (excluding bunker) as of the reported date	€ 1,557,000	780,000	409,000
Firm contract
Revenue
Contract backlog (excluding bunker) as of the reported date	1,379,000	653,000
Contract backlog (excluding bunker) as of the reported date		127,000
Options contract
Revenue
Contract backlog (excluding bunker) as of the reported date	178,000		351,000
Contract backlog (excluding bunker) as of the reported date			58,000
Customer 1
Revenue
Revenue	44,500	52,400	24,600
Customer 2
Revenue
Revenue	28,500	€ 53,200	€ 29,100
Customer 3
Revenue
Revenue	€ 22,700

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

No definition available.

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Represents the number of offshore jack-up windfarm installation vessels held for operations.

+ References

No definition available.

+ Details

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- Definition

Amount of revenue that is not accounted for under IFRS 15.

+ References

No definition available.

+ Details

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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.

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- Definition

The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2023-01-01
-Paragraph 114
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2023-en-r&anchor=para_114&doctype=Standard
-URIDate 2023-03-23

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2023-01-01
-Paragraph 113
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2023-en-r&anchor=para_113_a&doctype=Standard
-URIDate 2023-03-23

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