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Financial Assets and Financial Liabilities - Summary of Significant Unobservable Inputs (Level 3) Used for Recurring Fair Value Measurements and the Effect of the Measurements (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2021
Liabilities [Roll Forward]    
As of January 1, 2022 € 2,760.4  
As of January 1, 2023 3,223.5  
As of December 31, 2023 2,760.4  
Level 3 (Fair value) | Contingent consideration    
Liabilities [Roll Forward]    
As of January 1, 2022 38.8 € 6.1
As of January 1, 2023 6.1  
Purchases 31.8  
Net change in fair value 0.9  
As of December 31, 2023 € 38.8