Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2023-12-31 |
As at 2022-12-31 |
As at 2021-12-31 |
|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | |||
| Property, plant and equipment [abstract] | |||
| Property, plant and equipment |
3,700,000
EUR
|
3,600,000
EUR
|
— |
| Intangible assets and goodwill [abstract] | |||
| Intangible assets other than goodwill [abstract] | |||
| Other intangible assets |
88,200,000
EUR
|
87,400,000
EUR
|
— |
| Goodwill |
298,000,000
EUR
|
294,400,000
EUR
|
— |
| Investments in subsidiaries, joint ventures and associates reported in separate financial statements [abstract] | |||
| Investments in associates reported in separate financial statements |
4,400,000
EUR
|
4,200,000
EUR
|
— |
| Trade and other receivables [abstract] | |||
| Trade and other receivables |
33,300,000
EUR
|
33,900,000
EUR
|
— |
| Cash and cash equivalents [abstract] | |||
| Cash and cash equivalents |
52,400,000
EUR
|
30,000,000
EUR
|
51,900,000
EUR
|
| Trade and other payables [abstract] | |||
| Accruals and deferred income including contract liabilities [abstract] | |||
| Deferred income including contract liabilities [abstract] | |||
| Contract liabilities [abstract] | |||
| Advances received, representing contract liabilities for performance obligations satisfied at point in time |
44,000,000
EUR
|
43,900,000
EUR
|
— |
| Trade and other payables |
35,500,000
EUR
|
35,900,000
EUR
|
— |
| Categories of non-current financial liabilities [abstract] | |||
| Non-current financial liabilities |
166,500,000
EUR
|
149,600,000
EUR
|
— |
| Categories of current financial liabilities [abstract] | |||
| Current financial liabilities |
800,000
EUR
|
3,000,000
EUR
|
— |
| Issued capital [abstract] | |||
| Issued capital |
45,300,000
EUR
|
45,300,000
EUR
|
— |
| Retained earnings [abstract] | |||
| Retained earnings |
147,700,000
EUR
|
131,700,000
EUR
|
— |
| Accumulated other comprehensive income [abstract] | |||
| Reserve of exchange differences on translation |
500,000
EUR
|
600,000
EUR
|
— |
| Net assets (liabilities) [abstract] | |||
| Assets |
527,700,000
EUR
|
493,800,000
EUR
|
— |
| Liabilities |
305,000,000
EUR
|
287,800,000
EUR
|
— |
| Net current assets (liabilities) [abstract] | |||
| Current assets |
90,300,000
EUR
|
64,800,000
EUR
|
— |
| Current liabilities |
89,100,000
EUR
|
96,700,000
EUR
|
— |
| Assets less current liabilities [abstract] |