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Property, plant and equipment Disclosure Depreciation of Right of use Assets (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of quantitative information about right-of-use assets [line items]      
Depreciation, right-of-use assets € 16.1 € 0.0 € 0.0
Land and buildings [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Depreciation, right-of-use assets 10.7 0.0 0.0
Property, plant and equipment [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Depreciation, right-of-use assets 5.2 0.0 0.0
Computer equipment [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Depreciation, right-of-use assets € 0.2 € 0.0 € 0.0