Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2018-12-31 |
As at 2018-12-31 |
|---|---|---|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | ||||||
| Property, plant and equipment [abstract] | ||||||
| Property, plant and equipment |
664,644
EUR
|
600,532
EUR
|
584,117
EUR
|
656,383
EUR
|
— | — |
| Intangible assets and goodwill [abstract] | ||||||
| Intangible assets and goodwill |
190,033
EUR
|
141,451
EUR
|
132,692
EUR
|
194,945
EUR
|
— | — |
| Investment property [abstract] | ||||||
| Investment property |
1,258
EUR
|
4,230
EUR
|
4,002
EUR
|
1,030
EUR
|
— | — |
| Investments in subsidiaries, joint ventures and associates reported in separate financial statements [abstract] | ||||||
| Investments in subsidiaries reported in separate financial statements |
0
EUR
|
37,001
EUR
|
37,001
EUR
|
0
EUR
|
— | — |
| Trade and other non-current receivables [abstract] | ||||||
| Trade and other non-current receivables |
17,081
EUR
|
17,081
EUR
|
24,405
EUR
|
24,405
EUR
|
— | — |
| Non-current prepayments and non-current accrued income including non-current contract assets [abstract] | ||||||
| Non-current accrued income including non-current contract assets [abstract] | ||||||
| Non-current contract assets |
2,668
EUR
|
2,337
EUR
|
3,280
EUR
|
3,646
EUR
|
— | — |
| Miscellaneous non-current assets [abstract] | ||||||
| Non-current investments other than investments accounted for using equity method |
3,068
EUR
|
63,951
EUR
|
90,421
EUR
|
4,860
EUR
|
— | — |
| Trade and other current receivables [abstract] | ||||||
| Trade and other current receivables |
162,936
EUR
|
158,367
EUR
|
145,644
EUR
|
153,559
EUR
|
— | — |
| Current prepayments and current accrued income including current contract assets [abstract] | ||||||
| Current accrued income including current contract assets [abstract] | ||||||
| Current contract assets |
23,527
EUR
|
23,309
EUR
|
22,813
EUR
|
22,780
EUR
|
— | — |
| Classes of current inventories [abstract] | ||||||
| Current inventories |
26,175
EUR
|
21,811
EUR
|
20,579
EUR
|
24,620
EUR
|
— | — |
| Classes of current inventories, alternative [abstract] | ||||||
| Cash and cash equivalents [abstract] | ||||||
| Cash and cash equivalents |
8,167
EUR
|
2,086
EUR
|
1,153
EUR
|
13,219
EUR
|
10,684
EUR
|
2,011
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 |
214,000
EUR
|
214,000
EUR
|
500,000
EUR
|
500,000
EUR
|
— | — |
| Miscellaneous current assets [abstract] | ||||||
| Current investments |
512,000
EUR
|
17,385
EUR
|
10,226
EUR
|
679,000
EUR
|
— | — |
| Borrowings [abstract] | ||||||
| Non-current portion of non-current borrowings |
184,221
EUR
|
184,221
EUR
|
214,802
EUR
|
214,802
EUR
|
— | — |
| Current borrowings and current portion of non-current borrowings [abstract] | ||||||
| Current borrowings and current portion of non-current borrowings |
32,080
EUR
|
45,083
EUR
|
38,008
EUR
|
31,038
EUR
|
— | — |
| Non-current portion of non-current borrowings, by type [abstract] | ||||||
| Current borrowings and current portion of non-current borrowings, by type [abstract] | ||||||
| Trade and other non-current payables [abstract] | ||||||
| Non-current payables for purchase of non-current assets |
38,896
EUR
|
20,856
EUR
|
10,722
EUR
|
40,469
EUR
|
— | — |
| Non-current accruals and non-current deferred income including non-current contract liabilities [abstract] | ||||||
| Non-current deferred income including non-current contract liabilities [abstract] | ||||||
| Non-current contract liabilities [abstract] | ||||||
| Non-current contract liabilities |
15,772
EUR
|
14,974
EUR
|
15,655
EUR
|
16,691
EUR
|
— | — |
| Trade and other current payables [abstract] | ||||||
| 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 |
12,721
EUR
|
8,869
EUR
|
5,412
EUR
|
9,103
EUR
|
— | — |
| Accruals classified as current |
41,792
EUR
|
40,371
EUR
|
35,273
EUR
|
37,936
EUR
|
— | — |
| Trade and other current payables |
119,058
EUR
|
109,755
EUR
|
99,945
EUR
|
113,342
EUR
|
— | — |
| Issued capital [abstract] | ||||||
| Issued capital |
272,721
EUR
|
272,721
EUR
|
272,721
EUR
|
272,721
EUR
|
— | — |
| Retained earnings [abstract] | ||||||
| Retained earnings |
33,305
EUR
|
50,359
EUR
|
48,886
EUR
|
31,589
EUR
|
— | — |
| Accumulated other comprehensive income [abstract] | ||||||
| Reserve of exchange differences on translation |
25,000
EUR
|
0
EUR
|
0
EUR
|
6,000
EUR
|
— | — |
| Reserve of remeasurements of defined benefit plans |
2,988
EUR
|
2,733
EUR
|
2,069
EUR
|
2,347
EUR
|
— | — |
| Miscellaneous equity [abstract] | ||||||
| Statutory reserve |
54,854
EUR
|
54,544
EUR
|
54,544
EUR
|
54,854
EUR
|
— | — |
| Capital reserve |
181,489
EUR
|
180,956
EUR
|
180,956
EUR
|
181,488
EUR
|
— | — |
| Net assets (liabilities) [abstract] | ||||||
| Assets |
1.227.839
EUR
|
1.226.566
EUR
|
1.223.536
EUR
|
1.250.211
EUR
|
— | — |
| Liabilities |
637,355
EUR
|
620,782
EUR
|
617,400
EUR
|
659,623
EUR
|
— | — |
| Net current assets (liabilities) [abstract] | ||||||
| Current assets |
225,781
EUR
|
227,912
EUR
|
216,424
EUR
|
233,995
EUR
|
— | — |
| Current liabilities |
317,160
EUR
|
316,975
EUR
|
189,850
EUR
|
201,983
EUR
|
— | — |
| Assets less current liabilities [abstract] |