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Business combinations and divestures - Additional Information (Details) - EUR (€)
€ in Millions
12 Months Ended
Oct. 30, 2020
Dec. 31, 2022
Dec. 31, 2021
Nov. 30, 2021
Business Acquisition [Line Items]        
Business combination, consideration allocated to goodwill   € 4,555.6 € 4,555.6  
Medical Applications and Swiss Optic Business        
Business Acquisition [Line Items]        
Proceeds from disposals       € 339.4
Pre-tax gain, disposal group   € 213.7    
Berliner Glas        
Business Acquisition [Line Items]        
Percentage acquired 100.00%      
Business combination, consideration transferred € 257.1      
Business combination, consideration allocated to goodwill 87.9      
Business combination, assets recognized 312.1      
Business combination, liabilities recognized € 142.9