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Intangible assets - Summary of Intangible Assets (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Amortization charge for the year € 63,718 € 69,076 € 55,347
Impairment charge for the year 28,500    
Staff expenses 183,132 195,925 192,905
Intangible Asset Other than Goodwill | Cost      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 586,558 448,412  
Arising in business combinations   148,028  
Disposals 145,115 28,688  
Transfer from WIP   0  
Additions 73,240 49,396  
Transfer to assets held for sale   (27,793)  
Effects of movements in exchange rates 10,317 (2,797)  
Ending balance 525,000 586,558 448,412
Intangible Asset Other than Goodwill | Accumulated amortization and impairment      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (298,248) (222,183)  
Amortization charge for the year 63,718 69,076  
Disposals (136,905) (26,951)  
Transfer to assets held for sale   (1,407)  
Impairment charge for the year 35,530 36,293  
Effects of movements in exchange rates 3,421 (946)  
Ending balance (264,012) (298,248) (222,183)
Intangible Asset Other than Goodwill | Net Book Value      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 288,310    
Ending balance 260,988 288,310  
Intangible Asset Other than Goodwill | Customer databases | Cost      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 41,679 39,675  
Arising in business combinations   5,733  
Disposals 9,014 0  
Transfer from WIP   0  
Additions 0 0  
Transfer to assets held for sale   (3,913)  
Effects of movements in exchange rates 634 184  
Ending balance 33,299 41,679 39,675
Intangible Asset Other than Goodwill | Customer databases | Accumulated amortization and impairment      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (34,831) (25,346)  
Amortization charge for the year 5,408 10,456  
Disposals (9,014) 0  
Transfer to assets held for sale   (978)  
Impairment charge for the year 141 0  
Effects of movements in exchange rates 517 7  
Ending balance (31,883) (34,831) (25,346)
Intangible Asset Other than Goodwill | Customer databases | Net Book Value      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 6,848    
Ending balance 1,416 6,848  
Intangible Asset Other than Goodwill | Brands | Cost      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 75,634 75,393  
Arising in business combinations   0  
Disposals 0 0  
Transfer from WIP   0  
Additions 0 381  
Transfer to assets held for sale   (386)  
Effects of movements in exchange rates 497 246  
Ending balance 76,131 75,634 75,393
Intangible Asset Other than Goodwill | Brands | Accumulated amortization and impairment      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (32,404) (24,939)  
Amortization charge for the year 7,468 7,477  
Disposals 0 0  
Transfer to assets held for sale   (14)  
Impairment charge for the year 0 0  
Effects of movements in exchange rates 13 2  
Ending balance (39,885) (32,404) (24,939)
Intangible Asset Other than Goodwill | Brands | Net Book Value      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 43,230    
Ending balance 36,246 43,230  
Intangible Asset Other than Goodwill | Licenses | Cost      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 41,272 6,328  
Arising in business combinations   32,574  
Disposals 17,111 890  
Transfer from WIP   918  
Additions 628 3,770  
Transfer to assets held for sale   (249)  
Effects of movements in exchange rates 1,662 (1,179)  
Ending balance 26,451 41,272 6,328
Intangible Asset Other than Goodwill | Licenses | Accumulated amortization and impairment      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (7,316) (3,085)  
Amortization charge for the year 4,816 5,043  
Disposals (15,625) (890)  
Transfer to assets held for sale   (124)  
Impairment charge for the year 10,276 336  
Effects of movements in exchange rates 244 (134)  
Ending balance (7,027) (7,316) (3,085)
Intangible Asset Other than Goodwill | Licenses | Net Book Value      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 33,956    
Ending balance 19,424 33,956  
Intangible Asset Other than Goodwill | Exclusive license rights | Cost      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 55,000 55,000  
Arising in business combinations   0  
Disposals 0 0  
Transfer from WIP   0  
Additions 0 0  
Transfer to assets held for sale   0  
Effects of movements in exchange rates 0 0  
Ending balance 55,000 55,000 55,000
Intangible Asset Other than Goodwill | Exclusive license rights | Accumulated amortization and impairment      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (55,000) (55,000)  
Amortization charge for the year 0 0  
Disposals 0 0  
Transfer to assets held for sale   0  
Impairment charge for the year 0 0  
Effects of movements in exchange rates 0 0  
Ending balance (55,000) (55,000) (55,000)
Intangible Asset Other than Goodwill | Exclusive license rights | Net Book Value      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 0    
Ending balance 0 0  
Intangible Asset Other than Goodwill | Marketing and data analytics know-how | Cost      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 128,179 128,143  
Arising in business combinations   0  
Disposals 79,561 0  
Transfer from WIP   0  
Additions 0 0  
Transfer to assets held for sale   0  
Effects of movements in exchange rates 72 36  
Ending balance 48,690 128,179 128,143
Intangible Asset Other than Goodwill | Marketing and data analytics know-how | Accumulated amortization and impairment      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (99,149) (71,382)  
Amortization charge for the year 21,711 27,745  
Disposals (79,561) 0  
Transfer to assets held for sale   0  
Impairment charge for the year 0 0  
Effects of movements in exchange rates 176 22  
Ending balance (41,475) (99,149) (71,382)
Intangible Asset Other than Goodwill | Marketing and data analytics know-how | Net Book Value      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 29,030    
Ending balance 7,215 29,030  
Intangible Asset Other than Goodwill | Acquired technology | Cost      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 19,666 28,986  
Arising in business combinations   21,546  
Disposals 10,410 26,032  
Transfer from WIP   0  
Additions 0 343  
Transfer to assets held for sale   (4,658)  
Effects of movements in exchange rates 662 (519)  
Ending balance 9,918 19,666 28,986
Intangible Asset Other than Goodwill | Acquired technology | Accumulated amortization and impairment      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (4,010) (26,358)  
Amortization charge for the year 1,519 3,614  
Disposals (10,410) (25,633)  
Transfer to assets held for sale   (291)  
Impairment charge for the year 8,860 0  
Effects of movements in exchange rates 207 (38)  
Ending balance (4,186) (4,010) (26,358)
Intangible Asset Other than Goodwill | Acquired technology | Net Book Value      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 15,656    
Ending balance 5,732 15,656  
Intangible Asset Other than Goodwill | Internally- generated software development costs      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Staff expenses 18,400 19,300  
Intangible Asset Other than Goodwill | Internally- generated software development costs | Cost      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 95,053 53,334  
Arising in business combinations   0  
Disposals 29,019 1,766  
Transfer from WIP   (918)  
Additions 72,612 44,902  
Transfer to assets held for sale   0  
Effects of movements in exchange rates 1,345 (499)  
Ending balance 139,991 95,053 53,334
Intangible Asset Other than Goodwill | Internally- generated software development costs | Accumulated amortization and impairment      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (30,378) (16,073)  
Amortization charge for the year 22,796 14,741  
Disposals (22,295) (428)  
Transfer to assets held for sale   0  
Impairment charge for the year 9,219 8  
Effects of movements in exchange rates (161) (16)  
Ending balance (39,937) (30,378) (16,073)
Intangible Asset Other than Goodwill | Internally- generated software development costs | Net Book Value      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 64,675    
Ending balance 100,054 64,675  
Goodwill | Cost      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 130,075 61,553  
Arising in business combinations   88,175  
Disposals 0 0  
Transfer from WIP   0  
Additions 0 0  
Transfer to assets held for sale   (18,587)  
Effects of movements in exchange rates 5,445 (1,066)  
Ending balance 135,520 130,075 61,553
Goodwill | Accumulated amortization and impairment      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (35,160) 0  
Amortization charge for the year 0 0  
Disposals 0 0  
Transfer to assets held for sale   0  
Impairment charge for the year 7,034 35,949  
Effects of movements in exchange rates 2,425 (789)  
Ending balance (44,619) (35,160) € 0
Goodwill | Net Book Value      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 94,915    
Ending balance € 90,901 € 94,915