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Capital commitments (Details) - EUR (€)
€ in Millions
Dec. 31, 2021
Dec. 31, 2020
Capital Commitment [Line Items]    
Total capital commitments € 23.0 € 17.0
Property, plant and equipment    
Capital Commitment [Line Items]    
Total capital commitments 21.3 13.6
Intangible assets    
Capital Commitment [Line Items]    
Total capital commitments € 1.7 € 3.4