Employees
| 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 2022-12-31 | As at 2021-12-31 | As at 2020-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Employees | ||||||||||||
| Information about reporting company | ||||||||||||
| Number of employees of reporting company | ||||||||||||
| Number of employees | 
                                                5,562
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,107
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                29,775
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                3,316
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                34,198
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                3,976
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,215
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                371
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                5,480
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                5,399
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                5,257
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                5,574
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Average number of temporary employees | 
                                                394
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | 
                                                279
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                100
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                15
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                437
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                491
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                551
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                562
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |