Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2020-12-31 |
As at 2019-12-31 |
As at 2018-12-31 |
|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | |||
| Property, plant and equipment [abstract] | |||
| Property, plant and equipment |
807,824,000
EUR
|
862,848,000
EUR
|
— |
| Intangible assets and goodwill [abstract] | |||
| Intangible assets and goodwill |
107,371,000
EUR
|
109,082,000
EUR
|
— |
| Miscellaneous non-current assets [abstract] | |||
| Other non-current assets |
1,038,000
EUR
|
489,000
EUR
|
— |
| Trade and other current receivables [abstract] | |||
| Current trade receivables |
383,560,000
EUR
|
434,695,000
EUR
|
— |
| Other current receivables |
27,768,000
EUR
|
31,924,000
EUR
|
— |
| Current prepayments and current accrued income including current contract assets [abstract] | |||
| Current accrued income including current contract assets [abstract] | |||
| Current contract assets |
1,644,000
EUR
|
1,874,000
EUR
|
— |
| Categories of non-current financial assets [abstract] | |||
| Non-current financial assets at fair value through other comprehensive income [abstract] | |||
| Non-current investments in equity instruments designated at fair value through other comprehensive income |
10,420,000
EUR
|
9,681,000
EUR
|
— |
| Classes of current inventories [abstract] | |||
| Current inventories |
453,690,000
EUR
|
421,578,000
EUR
|
— |
| Classes of current inventories, alternative [abstract] | |||
| Cash and cash equivalents [abstract] | |||
| Cash and cash equivalents |
313,568,000
EUR
|
218,667,000
EUR
|
117,801,000
EUR
|
| Non-current assets or disposal groups classified as held for sale or as held for distribution to owners [abstract] | |||
| Non-current assets or disposal groups classified as held for sale |
41,000
EUR
|
41,000
EUR
|
— |
| Miscellaneous current assets [abstract] | |||
| Current investments |
9,499,000
EUR
|
2,174,000
EUR
|
— |
| Borrowings [abstract] | |||
| Current borrowings and current portion of non-current borrowings [abstract] | |||
| Current borrowings |
0
EUR
|
3,000
EUR
|
— |
| Trade and other non-current payables [abstract] | |||
| Trade and other non-current payables |
10,006,000
EUR
|
10,000,000
EUR
|
— |
| Trade and other current payables [abstract] | |||
| Current trade payables |
107,116,000
EUR
|
128,560,000
EUR
|
— |
| Current accruals and current deferred income including current contract liabilities [abstract] | |||
| Current deferred income including current contract liabilities [abstract] | |||
| Current contract liabilities [abstract] | |||
| Current contract liabilities |
106,299,000
EUR
|
123,312,000
EUR
|
— |
| Miscellaneous current liabilities [abstract] | |||
| Other current liabilities |
79,059,000
EUR
|
82,699,000
EUR
|
— |
| Issued capital [abstract] | |||
| Issued capital |
54,732,000
EUR
|
54,732,000
EUR
|
— |
| Retained earnings [abstract] | |||
| Retained earnings |
1,684,285,000
EUR
|
1,553,489,000
EUR
|
— |
| Net assets (liabilities) [abstract] | |||
| Assets |
2,235,542,000
EUR
|
2,184,618,000
EUR
|
— |
| Liabilities |
483,730,000
EUR
|
517,102,000
EUR
|
— |
| Net current assets (liabilities) [abstract] | |||
| Current assets |
1,244,544,000
EUR
|
1,142,785,000
EUR
|
— |
| Current liabilities |
310,934,000
EUR
|
356,197,000
EUR
|
— |
| Assets less current liabilities [abstract] |