Statement Of Financial Position [Abstract]
| Concept | As at 2024-12-31 | As at 2024-12-31 | As at 2024-12-31 | As at 2024-12-31 | As at 2024-12-31 | As at 2024-12-31 | As at 2024-12-31 | As at 2024-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||||||||||||||
| Assets [abstract] | ||||||||||||||||||||||||
| Investment property | — | — | — | — | — | — | — | 
                                                125,486
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                120,870
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Intangible assets other than goodwill | — | — | — | — | — | — | — | 
                                                8,999
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                9,239
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Investments accounted for using equity method | — | — | — | — | — | — | — | 
                                                875,718
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                813,907
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Current tax assets | — | — | — | — | — | — | — | 
                                                11,823
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                12,687
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Deferred tax assets | — | — | — | — | — | — | — | 
                                                9,651
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                8,447
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Cash and cash equivalents | — | — | — | — | — | — | — | 
                                                998,576
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                605,120
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                882,136
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
| Assets | — | — | — | — | — | — | — | 
                                                11.072.287
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                10.673.064
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Equity and liabilities [abstract] | ||||||||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||||||||
| Other equity interest | — | — | — | — | — | — | — | 
                                                65,200
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                65,200
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Equity attributable to owners of parent | — | — | — | — | — | — | — | 
                                                1.859.106
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                1.703.729
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Equity | 
                                                163,236
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                273,093
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                91,612
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                73,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                1.256.228
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                65,200
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                75,010
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                1.924.306
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                1.768.929
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                179,068
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                1.100.764
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                273,093
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                91,612
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                480,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                58,712
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                65,200
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                1.543.813
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                1.049.836
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                241,416
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                63,561
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                85,886
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                274,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                38,188
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                65,200
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Liabilities [abstract] | ||||||||||||||||||||||||
| Provisions [abstract] | ||||||||||||||||||||||||
| Provisions | — | — | — | — | — | — | — | 
                                                132,315
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                157,603
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Current tax liabilities | — | — | — | — | — | — | — | 
                                                11,880
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                11,651
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Deferred tax liabilities | — | — | — | — | — | — | — | 
                                                21,863
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                12,024
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Equity and liabilities | — | — | — | — | — | — | — | 
                                                11.072.287
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                10.673.064
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |