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Other Intangible Assets and Goodwill - Summary of Detailed Information About Intangible Assets (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance € 158.5  
Ending balance 804.1 € 158.5
Gross carrying amount    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 235.4 199.4
Additions 505.0 34.2
Acquisition of subsidiaries and businesses 187.4  
Disposals 3.2 0.1
Reclassifications 0.0 0.0
Currency differences 3.6 (1.9)
Ending balance 921.0 235.4
Cumulative depreciation and impairment charges    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance (76.9) (54.8)
Disposals (0.3) (0.1)
Currency differences (0.2) 0.2
Amortization 40.5 22.0
Ending balance (116.9) (76.9)
Concessions, licenses, in-process R&D and similar rights    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 145.4  
Ending balance 781.7 145.4
Concessions, licenses, in-process R&D and similar rights | Gross carrying amount    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 222.3 191.6
Additions 489.2 22.8
Acquisition of subsidiaries and businesses 187.4  
Disposals 1.6 0.1
Reclassifications 4.9 6.1
Currency differences 3.6 (1.9)
Ending balance 898.6 222.3
Concessions, licenses, in-process R&D and similar rights | Cumulative depreciation and impairment charges    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance (76.9) (54.8)
Disposals (0.3) (0.1)
Currency differences (0.2) 0.2
Amortization 40.5 22.0
Ending balance (116.9) (76.9)
Advance payments    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 13.1  
Ending balance 22.4 13.1
Advance payments | Gross carrying amount    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 13.1 7.8
Additions 15.8 11.4
Acquisition of subsidiaries and businesses 0.0  
Disposals 1.6 0.0
Reclassifications (4.9) (6.1)
Currency differences 0.0 0.0
Ending balance 22.4 13.1
Advance payments | Cumulative depreciation and impairment charges    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 0.0 0.0
Disposals 0.0 0.0
Currency differences 0.0 0.0
Amortization 0.0 0.0
Ending balance € 0.0 € 0.0