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] | |||
| Land and buildings [abstract] | |||
| Land and buildings |
244,600,000
EUR
|
238,600,000
EUR
|
— |
| Construction in progress |
35,900,000
EUR
|
23,900,000
EUR
|
— |
| Intangible assets and goodwill [abstract] | |||
| Intangible assets other than goodwill [abstract] | |||
| Other intangible assets |
142,800,000
EUR
|
135,200,000
EUR
|
— |
| Goodwill |
244,500,000
EUR
|
262,800,000
EUR
|
— |
| Intangible assets and goodwill |
387,300,000
EUR
|
398,000,000
EUR
|
— |
| Investments accounted for using equity method [abstract] | |||
| Investments in associates accounted for using equity method |
11,400,000
EUR
|
13,200,000
EUR
|
— |
| Trade and other non-current receivables [abstract] | |||
| Non-current receivables due from related parties | — | — | — |
| Non-current receivables due from associates |
0
EUR
|
100,000
EUR
|
— |
| Other non-current receivables |
0
EUR
|
100,000
EUR
|
— |
| Miscellaneous non-current assets [abstract] | |||
| Non-current net defined benefit asset |
2,800,000
EUR
|
2,600,000
EUR
|
— |
| Trade and other current receivables [abstract] | |||
| Other current receivables |
11,800,000
EUR
|
14,200,000
EUR
|
— |
| Trade and other current receivables |
223,600,000
EUR
|
239,900,000
EUR
|
— |
| Trade and other receivables [abstract] | |||
| Trade receivables |
129,300,000
EUR
|
156,700,000
EUR
|
— |
| Prepayments and accrued income including contract assets [abstract] | |||
| Prepayments and accrued income including contract assets |
14,200,000
EUR
|
12,500,000
EUR
|
— |
| Categories of financial assets [abstract] | |||
| Financial assets |
14,800,000
EUR
|
22,100,000
EUR
|
— |
| Classes of current inventories [abstract] | |||
| Current raw materials and current production supplies [abstract] | |||
| Current raw materials and current production supplies |
46,000,000
EUR
|
53,900,000
EUR
|
— |
| Current work in progress |
4,800,000
EUR
|
5,400,000
EUR
|
— |
| Current finished goods |
81,900,000
EUR
|
108,300,000
EUR
|
— |
| Current inventories |
132,600,000
EUR
|
167,600,000
EUR
|
— |
| Classes of current inventories, alternative [abstract] | |||
| Cash and cash equivalents [abstract] | |||
| Cash and cash equivalents |
63,600,000
EUR
|
47,500,000
EUR
|
142,300,000
EUR
|
| Classes of other provisions [abstract] | |||
| Other provisions [abstract] | |||
| Other provisions |
2,500,000
EUR
|
400,000
EUR
|
— |
| Non-current portion of non-current borrowings, by type [abstract] | |||
| Non-current portion of non-current bonds issued |
247,900,000
EUR
|
246,900,000
EUR
|
— |
| Trade and other payables [abstract] | |||
| Trade payables |
81,600,000
EUR
|
83,500,000
EUR
|
— |
| Accruals and deferred income including contract liabilities [abstract] | |||
| Accruals and deferred income including contract liabilities |
60,400,000
EUR
|
97,300,000
EUR
|
— |
| Miscellaneous current liabilities [abstract] | |||
| Other current liabilities |
14,600,000
EUR
|
15,100,000
EUR
|
— |
| Issued capital [abstract] | |||
| Issued capital |
18,300,000
EUR
|
18,200,000
EUR
|
— |
| Retained earnings [abstract] | |||
| Retained earnings |
76,500,000
EUR
|
94,700,000
EUR
|
— |
| Miscellaneous equity [abstract] | |||
| Additional paid-in capital |
323,000,000
EUR
|
322,300,000
EUR
|
— |
| Net assets (liabilities) [abstract] | |||
| Assets |
1 253.4
EUR
|
1 300.7
EUR
|
— |
| Liabilities |
837,700,000
EUR
|
870,900,000
EUR
|
— |
| Net current assets (liabilities) [abstract] | |||
| Current assets |
356,200,000
EUR
|
407,500,000
EUR
|
— |
| Current liabilities |
204,800,000
EUR
|
325,200,000
EUR
|
— |
| Assets less current liabilities [abstract] |