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Property, plant and equipment Disclosure NBV of Right of Use Assets (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Asset Class of RIght of use Assets [Line Items]    
Right-of-use assets € 72.4 € 0.0
Additions to right-of-use assets 6.2  
Land and buildings [member]    
Asset Class of RIght of use Assets [Line Items]    
Right-of-use assets 62.8 0.0
Property, plant and equipment [member]    
Asset Class of RIght of use Assets [Line Items]    
Right-of-use assets 9.2 0.0
Computer equipment [member]    
Asset Class of RIght of use Assets [Line Items]    
Right-of-use assets € 0.4 € 0.0