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Capital commitments (Details) - EUR (€)
€ in Millions
Dec. 31, 2019
Dec. 31, 2018
Capital Commitment [Line Items]    
Total capital commitments € 12.1 € 9.6
Property, plant and equipment    
Capital Commitment [Line Items]    
Total capital commitments 11.5 6.8
Intangible assets    
Capital Commitment [Line Items]    
Total capital commitments € 0.6 € 2.8