Statement Of Cash Flows [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 | 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 | 2024-01-01 to 2024-12-31 | As at 2024-12-31 | 2023-01-01 to 2023-12-31 | As at 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 | 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 | As at 2022-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | ||||||||||||||||||||||||
| Cash flows from (used in) operating activities [abstract] | ||||||||||||||||||||||||
| Profit (loss) | 
                                                -
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                873,604,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                873,604,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                80,884,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                792,720,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                1,809,834,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                1,656,495,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                153,339,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                1,656,495,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Adjustments to reconcile profit (loss) [abstract] | ||||||||||||||||||||||||
| Adjustments for income tax expense | — | — | — | — | — | — | — | — | 
                                                2,749,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
                                                156,123,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
| Other adjustments for non-cash items | — | — | — | — | — | — | — | — | 
                                                198,900,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
                                                63,174,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
| Other adjustments to reconcile profit (loss) | — | — | — | — | — | — | — | — | 
                                                118,737,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
                                                112,238,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
| Income taxes paid (refund), classified as operating activities | — | — | — | — | — | — | — | — | 
                                                96,612,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
                                                20,627,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
| Cash flows from (used in) operating activities | — | — | — | — | — | — | — | — | 
                                                168,514,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
                                                126,559,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
| Cash flows from (used in) investing activities [abstract] | ||||||||||||||||||||||||
| Proceeds from sales of property, plant and equipment, classified as investing activities | — | — | — | — | — | — | — | — | 
                                                305,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
                                                3,533,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
| Purchase of property, plant and equipment, classified as investing activities | — | — | — | — | — | — | — | — | 
                                                1,988,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
                                                2,351,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
| Interest received, classified as investing activities | — | — | — | — | — | — | — | — | 
                                                9,827,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
                                                6,683,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
| Cash flows from (used in) investing activities | — | — | — | — | — | — | — | — | 
                                                34,208,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
                                                154,574,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
| Cash flows from (used in) financing activities [abstract] | ||||||||||||||||||||||||
| Payments from changes in ownership interests in subsidiaries that do not result in loss of control | — | — | — | — | — | — | — | — | 
                                                532,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
                                                28,800,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
| Payments of other equity instruments | — | — | — | — | — | — | — | — | 
                                                3,869,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
                                                -
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
| Payments of lease liabilities, classified as financing activities | — | — | — | — | — | — | — | — | 
                                                4,397,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
                                                8,232,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
| Interest paid, classified as financing activities | — | — | — | — | — | — | — | — | 
                                                146,711,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
                                                119,619,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
| Cash flows from (used in) financing activities | — | — | — | — | — | — | — | — | 
                                                30,096,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
                                                205,524,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
| Cash and cash equivalents | — | — | — | — | — | — | — | — | — | — | — | 
                                                246,990,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                377,419,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                386,985,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             |