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 |
19,900,000
EUR
|
19,100,000
EUR
|
— |
| Intangible assets and goodwill [abstract] | |||
| Intangible assets other than goodwill [abstract] | |||
| Intangible assets other than goodwill |
50,300,000
EUR
|
56,400,000
EUR
|
— |
| Goodwill |
465,300,000
EUR
|
442,500,000
EUR
|
— |
| Investments in subsidiaries, joint ventures and associates reported in separate financial statements [abstract] | |||
| Investments in subsidiaries, joint ventures and associates reported in separate financial statements |
100,000
EUR
|
100,000
EUR
|
— |
| Investments accounted for using equity method [abstract] | |||
| Investments accounted for using equity method |
1,100,000
EUR
|
1,100,000
EUR
|
— |
| Trade and other non-current receivables [abstract] | |||
| Trade and other non-current receivables |
4,500,000
EUR
|
8,400,000
EUR
|
— |
| Trade and other current receivables [abstract] | |||
| Current trade receivables |
369,700,000
EUR
|
379,600,000
EUR
|
— |
| Other current receivables |
33,400,000
EUR
|
32,100,000
EUR
|
— |
| Current prepayments and current accrued income including current contract assets [abstract] | |||
| Current accrued income including current contract assets [abstract] | |||
| Current contract assets |
236,300,000
EUR
|
231,300,000
EUR
|
— |
| Classes of current inventories [abstract] | |||
| Current inventories |
19,400,000
EUR
|
22,300,000
EUR
|
— |
| Classes of current inventories, alternative [abstract] | |||
| Cash and cash equivalents [abstract] | |||
| Cash and cash equivalents |
41,500,000
EUR
|
81,200,000
EUR
|
130,900,000
EUR
|
| Trade and other current payables [abstract] | |||
| Trade and other current payables |
201,900,000
EUR
|
198,500,000
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 |
273,200,000
EUR
|
286,200,000
EUR
|
— |
| Miscellaneous liabilities [abstract] | |||
| Net defined benefit liability |
39,700,000
EUR
|
41,900,000
EUR
|
— |
| Issued capital [abstract] | |||
| Issued capital |
1,000,000
EUR
|
1,000,000
EUR
|
— |
| Retained earnings [abstract] | |||
| Retained earnings |
122,400,000
EUR
|
135,100,000
EUR
|
— |
| Accumulated other comprehensive income [abstract] | |||
| Revaluation surplus |
300,000
EUR
|
300,000
EUR
|
— |
| Reserve of exchange differences on translation |
11,700,000
EUR
|
9,600,000
EUR
|
— |
| Miscellaneous equity [abstract] | |||
| Reserve of equity component of convertible instruments | — |
35,000,000
EUR
|
— |
| Net assets (liabilities) [abstract] | |||
| Assets |
1,397,700,000
EUR
|
1,424,700,000
EUR
|
— |
| Liabilities |
1,222,100,000
EUR
|
1,199,300,000
EUR
|
— |
| Net current assets (liabilities) [abstract] | |||
| Current assets |
704,200,000
EUR
|
749,400,000
EUR
|
— |
| Current liabilities |
967,100,000
EUR
|
876,200,000
EUR
|
— |
| Assets less current liabilities [abstract] |