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Intangible assets, net - Finite-Lived Other Intangible Assets (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Cost      
Cost, beginning balance € 1,908.5 € 1,894.9  
Additions 58.5 14.3  
Disposals (11.6) (0.6)  
Effect of changes in exchange rates 0.9 (0.1)  
Cost, ending balance 1,956.3 1,908.5 € 1,894.9
Accumulated amortization and impairment      
Accumulated amortization, beginning balance 1,287.2 1,153.2  
Amortization € 123.5 126.0 127.6
Impairment Intangible Asset, Statement Of Income Or Comprehensive Income, Extensible Enumeration Not Disclosed Flag Impairment charges    
Impairment charges € 6.5 8.0  
Disposals (0.1) (0.5)  
Accumulated amortization, ending balance 1,416.2 1,287.2 1,153.2
Carrying amount      
Carrying amount 540.1 621.3  
Accumulated amortization and impairment      
Cost      
Effect of changes in exchange rates (0.9) 0.5  
Brands      
Cost      
Cost, beginning balance 38.9 38.9  
Additions 0.0 0.0  
Disposals 0.0 0.0  
Effect of changes in exchange rates 0.0 0.0  
Cost, ending balance 38.9 38.9 38.9
Accumulated amortization and impairment      
Accumulated amortization, beginning balance 18.7 16.8  
Amortization 1.9 1.9  
Impairment charges 0.0 0.0  
Disposals 0.0 0.0  
Accumulated amortization, ending balance 20.6 18.7 16.8
Carrying amount      
Carrying amount 18.3 20.2  
Brands | Accumulated amortization and impairment      
Cost      
Effect of changes in exchange rates 0.0 0.0  
Intellectual property      
Cost      
Cost, beginning balance 147.1 147.1  
Additions 0.0 0.0  
Disposals 0.0 0.0  
Effect of changes in exchange rates 0.0 0.0  
Cost, ending balance 147.1 147.1 147.1
Accumulated amortization and impairment      
Accumulated amortization, beginning balance 112.4 104.1  
Amortization 8.1 8.3  
Impairment charges 6.5 0.0  
Disposals 0.0 0.0  
Accumulated amortization, ending balance 127.0 112.4 104.1
Carrying amount      
Carrying amount 20.1 34.7  
Intellectual property | Accumulated amortization and impairment      
Cost      
Effect of changes in exchange rates 0.0 0.0  
Developed technology      
Cost      
Cost, beginning balance 1,220.2 1,220.2  
Additions 0.0 0.0  
Disposals 0.0 0.0  
Effect of changes in exchange rates 0.0 0.0  
Cost, ending balance 1,220.2 1,220.2 1,220.2
Accumulated amortization and impairment      
Accumulated amortization, beginning balance 828.7 754.2  
Amortization 74.5 74.5  
Impairment charges 0.0 0.0  
Disposals 0.0 0.0  
Accumulated amortization, ending balance 903.2 828.7 754.2
Carrying amount      
Carrying amount 317.0 391.5  
Developed technology | Accumulated amortization and impairment      
Cost      
Effect of changes in exchange rates 0.0 0.0  
Customer relationships      
Cost      
Cost, beginning balance 228.6 228.6  
Additions 0.0 0.0  
Disposals 0.0 0.0  
Effect of changes in exchange rates 0.0 0.0  
Cost, ending balance 228.6 228.6 228.6
Accumulated amortization and impairment      
Accumulated amortization, beginning balance 146.6 134.0  
Amortization 12.6 12.6  
Impairment charges 0.0 0.0  
Disposals 0.0 0.0  
Accumulated amortization, ending balance 159.2 146.6 134.0
Carrying amount      
Carrying amount 69.4 82.0  
Customer relationships | Accumulated amortization and impairment      
Cost      
Effect of changes in exchange rates 0.0 0.0  
Other      
Cost      
Cost, beginning balance 273.7 260.1  
Additions 58.5 14.3  
Disposals (11.6) (0.6)  
Effect of changes in exchange rates 0.9 (0.1)  
Cost, ending balance 321.5 273.7 260.1
Accumulated amortization and impairment      
Accumulated amortization, beginning balance 180.8 144.1  
Amortization 26.4 28.7  
Impairment charges 0.0 8.0  
Disposals (0.1) (0.5)  
Accumulated amortization, ending balance 206.2 180.8 € 144.1
Carrying amount      
Carrying amount 115.3 92.9  
Other | Accumulated amortization and impairment      
Cost      
Effect of changes in exchange rates € (0.9) € 0.5