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Property, plant and equipment - Additional Information (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items]    
Construction in progress € 13.1 € 10.2
Percentage of consolidated gross assets or adjusted EBITDA held individually by companies in Guarantor Group 5.00%  
Percentage of consolidated gross assets or adjusted EBITDA held by Guarantor Group in total 80.00%