Statement Of Cash Flows [Abstract]
| Concept |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
As at 2022-12-31 |
2022-01-01 to 2022-12-31 |
As at 2022-12-31 |
As at 2021-12-31 |
|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||||
| Cash flows from (used in) operating activities [abstract] | |||||||
| Other inflows (outflows) of cash, classified as operating activities | — |
8,600,000
EUR
|
— | — |
3,300,000
EUR
|
— | — |
| Cash flows from (used in) operating activities | — |
21,500,000
EUR
|
— | — |
102,400,000
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
|
— | — |
40,400,000
EUR
|
— | — |
| Interest received, classified as investing activities | — |
1,200,000
EUR
|
— | — |
1,600,000
EUR
|
— | — |
| Cash flows from (used in) investing activities | — |
29,100,000
EUR
|
— | — |
202,600,000
EUR
|
— | — |
| Cash flows from (used in) financing activities [abstract] | |||||||
| Payments to acquire or redeem entity's shares | — |
3,900,000
EUR
|
— | — |
23,500,000
EUR
|
— | — |
| Payments of lease liabilities, classified as financing activities | — |
9,800,000
EUR
|
— | — |
9,900,000
EUR
|
— | — |
| Cash flows from (used in) financing activities | — |
39,700,000
EUR
|
— | — |
154,000,000
EUR
|
— | — |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||||||
| Effect of exchange rate changes on cash and cash equivalents | — |
900,000
EUR
|
— | — |
3,600,000
EUR
|
— | — |
| Increase (decrease) in cash and cash equivalents after effect of exchange rate changes | — |
48,200,000
EUR
|
— | — |
154,600,000
EUR
|
— | — |
| Cash and cash equivalents |
164,700,000
EUR
|
— |
164,700,000
EUR
|
212,900,000
EUR
|
— |
212,900,000
EUR
|
58,300,000
EUR
|