Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept | As at 2024-12-31 | As at 2023-12-31 | As at 2022-12-31 | 
|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | |||
| Property, plant and equipment [abstract] | |||
| Property, plant and equipment | 
                                                1.379.040,7
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                1.324.261,5
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Intangible assets and goodwill [abstract] | |||
| Intangible assets other than goodwill [abstract] | |||
| Intangible assets other than goodwill | 
                                                151,502
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                156,245
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Investment property [abstract] | |||
| Investment property | 
                                                133,925
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                131,032
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Investments accounted for using equity method [abstract] | |||
| Investments accounted for using equity method | 
                                                44,030
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                42,854
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Trade and other current receivables [abstract] | |||
| Trade and other current receivables | 
                                                601,567
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                450,040
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Classes of current inventories [abstract] | |||
| Current inventories | 
                                                8,362
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                7,654
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Classes of current inventories, alternative [abstract] | |||
| Cash and cash equivalents [abstract] | |||
| Cash and cash equivalents | 
                                                22,088
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                31,904
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                105,219
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Trade and other current payables [abstract] | |||
| Trade and other current payables | 
                                                50,478
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                39,020
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Issued capital [abstract] | |||
| Issued capital | 
                                                152,670
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                152,670
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Retained earnings [abstract] | |||
| Retained earnings | 
                                                1.266.479,9
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                1.160.577,0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Net assets (liabilities) [abstract] | |||
| Assets | 
                                                2.400.390,8
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                2.194.357,1
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Net current assets (liabilities) [abstract] | |||
| Current liabilities | 
                                                412,976
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                345,380
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Assets less current liabilities [abstract] |