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Long-term debt and interest and other costs - Narratives (Detail) - EUR (€)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]      
Redemption price, percentage 100.00%    
Maximum borrowing capacity € 700,000,000 € 700,000,000  
Available credit facility 0 0  
Non-committed guarantee facility 85,000,000    
Non committed guarantee provided 46,800,000    
Non committed credit facility with subsidiary 130,000,000    
Line of credit facility, maximum cash advances included in credit facility 130,000,000    
Investment income 193,900,000 16,200,000 € 10,000,000
Interest expense 152,700,000 € 60,800,000 € 54,600,000
Non-committed unsecured lines of credit      
Debt Instrument [Line Items]      
Maximum borrowing capacity 1,250,000,000    
Berliner Glas      
Debt Instrument [Line Items]      
Secured long-term debt, noncurrent € 20,500,000    
Interest rate on principal amount (in percentage) 0.50%