Statement Of Cash Flows [Abstract]
| Concept |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2020-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | ||||||||||
| Cash flows from (used in) operating activities [abstract] | ||||||||||
| Income taxes paid (refund), classified as operating activities | — |
0
EUR
|
— |
691,000
EUR
|
— |
848,000
EUR
|
0
EUR
|
— | — | — |
| Cash flows from (used in) operating activities | — |
183,301,000
EUR
|
— |
218,869,000
EUR
|
— |
220,750,000
EUR
|
202,093,000
EUR
|
— | — | — |
| Cash flows from (used in) investing activities [abstract] | ||||||||||
| Cash flows from losing control of subsidiaries or other businesses, classified as investing activities | — |
0
EUR
|
— |
0
EUR
|
— |
5,000,000
EUR
|
5,000,000
EUR
|
— | — | — |
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | — |
1,500,000
EUR
|
— |
0
EUR
|
— |
0
EUR
|
0
EUR
|
— | — | — |
| Proceeds from sales of property, plant and equipment, classified as investing activities | — |
5,846,000
EUR
|
— |
5,846,000
EUR
|
— |
322,000
EUR
|
322,000
EUR
|
— | — | — |
| Purchase of property, plant and equipment, classified as investing activities | — |
82,148,000
EUR
|
— |
94,693,000
EUR
|
— |
97,475,000
EUR
|
89,013,000
EUR
|
— | — | — |
| Purchase of intangible assets, classified as investing activities | — |
100,673,000
EUR
|
— |
104,274,000
EUR
|
— |
62,798,000
EUR
|
63,464,000
EUR
|
— | — | — |
| Cash receipts from repayment of advances and loans made to other parties, classified as investing activities | — |
13,426,000
EUR
|
— |
79,000
EUR
|
— |
240,000
EUR
|
8,547,000
EUR
|
— | — | — |
| Dividends received, classified as investing activities | — |
11,128,000
EUR
|
— |
128,000
EUR
|
— |
6,000
EUR
|
840,000
EUR
|
— | — | — |
| Interest received, classified as investing activities | — |
2,155,000
EUR
|
— |
7,000
EUR
|
— |
1,000
EUR
|
2,420,000
EUR
|
— | — | — |
| Cash flows from (used in) investing activities | — |
152,966,000
EUR
|
— |
193,157,000
EUR
|
— |
154,710,000
EUR
|
136,803,000
EUR
|
— | — | — |
| Cash flows from (used in) financing activities [abstract] | ||||||||||
| Payments of lease liabilities, classified as financing activities | — |
11,655,000
EUR
|
— |
12,593,000
EUR
|
— |
9,819,000
EUR
|
9,113,000
EUR
|
— | — | — |
| Dividends paid, classified as financing activities | — |
29,275,000
EUR
|
— |
29,275,000
EUR
|
— |
22,769,000
EUR
|
22,769,000
EUR
|
— | — | — |
| Interest paid, classified as financing activities | — |
8,537,000
EUR
|
— |
8,481,000
EUR
|
— |
8,747,000
EUR
|
8,750,000
EUR
|
— | — | — |
| Other inflows (outflows) of cash, classified as financing activities | — |
0
EUR
|
— |
5,000
EUR
|
— |
0
EUR
|
0
EUR
|
— | — | — |
| Cash flows from (used in) financing activities | — |
28,708,000
EUR
|
— |
17,985,000
EUR
|
— |
71,136,000
EUR
|
64,401,000
EUR
|
— | — | — |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | ||||||||||
| Effect of exchange rate changes on cash and cash equivalents | — |
41,000
EUR
|
— |
41,000
EUR
|
— |
44,000
EUR
|
44,000
EUR
|
— | — | — |
| Increase (decrease) in cash and cash equivalents after effect of exchange rate changes | — |
1,627,000
EUR
|
— |
7,727,000
EUR
|
— |
5,096,000
EUR
|
889,000
EUR
|
— | — | — |
| Cash and cash equivalents |
15,935,000
EUR
|
— |
3,754,000
EUR
|
— |
8,167,000
EUR
|
— | — |
2,086,000
EUR
|
1,153,000
EUR
|
13,219,000
EUR
|