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Cash and cash equivalents and short-term investments - Short-Term Investments (Details) - EUR (€)
€ in Millions
Dec. 31, 2025
Dec. 31, 2024
Short Term Investments [Line Items]    
Cash and cash equivalents € 12,916.0 € 12,735.9
Short-term investments 405.9 5.4
Deposits with financial institutions, governments and government-related bodies    
Short Term Investments [Line Items]    
Cash and cash equivalents 5,558.5 4,850.4
Bank accounts    
Short Term Investments [Line Items]    
Cash and cash equivalents € 1,135.3 1,506.3
Fair value, recurring    
Short Term Investments [Line Items]    
Investments in money market funds   € 6,379.2