v3.26.1
Cash flow information - Additional Information (Detail)
€ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2025
EUR (€)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
EUR (€)
Dec. 31, 2023
EUR (€)
Schedule Of Net Debt Reconciliation [Line Items]        
Proceeds from issuing other equity instruments € 2.0     € 1.0
Proceeds from borrowings, classified as financing activities 33.5 $ 28.1    
Repayments of borrowings, classified as financing activities 2,906.0   € 717.0 706.0
Foreign exchange gain (loss) 3.0   € (1.0) € 2.0
Cash And Cash Equivalent [Member]        
Schedule Of Net Debt Reconciliation [Line Items]        
Foreign exchange gain (loss) 328.0      
Hybrid Dual Tranche Bond [Member]        
Schedule Of Net Debt Reconciliation [Line Items]        
Proceeds from issuing other equity instruments 1,000.0      
Perpetual Bond 2016 [Member]        
Schedule Of Net Debt Reconciliation [Line Items]        
Repayments of borrowings, classified as financing activities 550.0      
German Bond Tranche [Member]        
Schedule Of Net Debt Reconciliation [Line Items]        
Repayments of borrowings, classified as financing activities € 150.0