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Cash and cash equivalents and short-term investments - Narrative (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Cash and Cash Equivalents [Line Items]    
Maturity of of cash and cash equivalents three months  
Restricted cash and cash equivalents € 0.0 € 0.0
Minimum    
Cash and Cash Equivalents [Line Items]    
Short term investments maturity period 3 months  
Maximum    
Cash and Cash Equivalents [Line Items]    
Short term investments maturity period 1 year