Related Party Disclosures - Summary of Transactions Between Related Parties Amount (Details) - Other Related Parties - EUR (€) € in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Transactions Between Related Parties [Line Items]
Purchases of various goods and services from entities controlled by ATHOS KG	€ 2,296	€ 2,071	€ 2,431
Purchases of property and other assets from entities controlled by ATHOS KG	2,349		4,748
Total	€ 4,645	€ 2,071	€ 7,179

The amount of property and other assets purchased by the entity in related party transactions. [Refer: Related parties [member]]

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 24
-IssueDate 2020-01-01
-Paragraph 21
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2020-en-r&anchor=para_21_b&doctype=Standard
-URIDate 2020-01-01

Name:	ifrs-full_PurchasesOfPropertyAndOtherAssetsRelatedPartyTransactions
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration