v3.26.1
Financial instruments - Categories of financial instruments (Details) - EUR (€)
€ in Millions
84 Months Ended
Nov. 10, 2032
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Dec. 31, 2024
Disclosure Of Financial Assets And Liabilities [Table] [Line Items]          
Financial assets at amortized cost   € 273.4 € 324.8 € 266.6 € 403.3
Financial assets at amortised cost   429.1 424.5    
Financial assets at fair value through profit or loss   195.5 216.1    
Financial liabilities at amortised cost   (3,085.1) (3,031.7)    
Financial assets (liabilities) at fair value through other comprehensive income   (95.8) (126.7)    
Total   (2,556.3) (2,517.8)    
Borrowing costs capitalised € 1.2        
Derivative financial instruments          
Disclosure Of Financial Assets And Liabilities [Table] [Line Items]          
Financial liabilities at amortised cost   0.0 0.0    
Financial liabilities   (103.5) (131.6)    
Financial Liabilities At Fair Value Through Other Comprehensive Income   (103.5) (131.6)    
Trade and other payables excluding non-financial liabilities          
Disclosure Of Financial Assets And Liabilities [Table] [Line Items]          
Financial liabilities at amortised cost   (773.1) (740.5)    
Financial liabilities   (773.1) (740.5)    
Financial Liabilities At Fair Value Through Other Comprehensive Income   0.0 0.0    
Loans and borrowings          
Disclosure Of Financial Assets And Liabilities [Table] [Line Items]          
Financial liabilities at amortised cost   (2,312.0) (2,291.2)    
Financial liabilities   (2,312.0) (2,291.2)    
Financial Liabilities At Fair Value Through Other Comprehensive Income   0.0 0.0    
Derivative financial instruments          
Disclosure Of Financial Assets And Liabilities [Table] [Line Items]          
Financial assets   7.7 4.9    
Derivative financial assets held for hedging   7.7 4.9    
Trade and other receivables excluding non-financial assets          
Disclosure Of Financial Assets And Liabilities [Table] [Line Items]          
Financial assets at amortised cost   351.2 315.8    
Financial assets   351.2 315.8    
Cash and cash equivalents          
Disclosure Of Financial Assets And Liabilities [Table] [Line Items]          
Financial assets at amortised cost   77.9 108.7    
Financial assets at fair value through profit or loss   195.5 216.1    
Financial assets   € 273.4 € 324.8