Statement Of Comprehensive Income [Abstract]
| Concept | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|
| Statement of comprehensive income [abstract] | ||||||||||
| Profit (loss) | 
                                                163,236
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
                                                163,236
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                179,068
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                179,068
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
| Other comprehensive income [abstract] | ||||||||||
| Components of other comprehensive income that will not be reclassified to profit or loss, before tax [abstract] | ||||||||||
| Other comprehensive income, before tax, gains (losses) from investments in equity instruments | 
                                                15,215
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
                                                19,889
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
| Other comprehensive income, before tax, gains (losses) on remeasurements of defined benefit plans | 
                                                3,085
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
                                                5,445
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
| Other comprehensive income, before tax, change in fair value of financial liability attributable to change in credit risk of liability | 
                                                217,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
                                                292,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
| Share of other comprehensive income of associates and joint ventures accounted for using equity method that will not be reclassified to profit or loss, before tax | 
                                                2,439
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
                                                4,198
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
| Other comprehensive income that will not be reclassified to profit or loss, before tax | 
                                                11,815
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
                                                15,542
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
| Components of other comprehensive income that will be reclassified to profit or loss, before tax [abstract] | ||||||||||
| Exchange differences on translation [abstract] | ||||||||||
| Gains (losses) on exchange differences on translation of foreign operations, before tax | 
                                                7,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
                                                2,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
| Financial assets measured at fair value through other comprehensive income [abstract] | ||||||||||
| Gains (losses) on financial assets measured at fair value through other comprehensive income, before tax | 
                                                718,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
                                                2,016
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
| Reclassification adjustments on financial assets measured at fair value through other comprehensive income, before tax | 
                                                4,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
                                                -
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
| Share of other comprehensive income of associates and joint ventures accounted for using equity method that will be reclassified to profit or loss, before tax | 
                                                996,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
                                                431,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
| Other comprehensive income that will be reclassified to profit or loss, before tax | 
                                                1,553
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
                                                1,982
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
| Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss [abstract] | ||||||||||
| Income tax relating to investments in equity instruments included in other comprehensive income | 
                                                3,499
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
                                                4,575
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
| Income tax relating to remeasurements of defined benefit plans included in other comprehensive income | 
                                                713,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
                                                1,250
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
| Income tax relating to changes in fair value of financial liability attributable to change in credit risk of liability included in other comprehensive income | 
                                                50,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
                                                67,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
| Income tax relating to components of other comprehensive income that will be reclassified to profit or loss [abstract] | ||||||||||
| Income tax relating to financial assets measured at fair value through other comprehensive income included in other comprehensive income | 
                                                164,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
                                                464,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
| Other comprehensive income | 
                                                13,367
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                553,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                16,119
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                2,199
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                17,524
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                3,713
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                20,482
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                754,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Comprehensive income | 
                                                176,604
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                553,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                16,119
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                2,199
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                163,236
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                196,592
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                3,713
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                179,068
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                20,482
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                754,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             |