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Lease liabilities (non-current and current) - Summary of Maturity Analysis of Contractual Undiscounted Cash Flows of Lease Liabilities (Details)
€ in Thousands
Dec. 31, 2019
EUR (€)
Disclosure of Non Current and Current Portion of the Lease Liabilities [Line Items]  
Undiscounted lease liabilities € 68,228
Later than one year [member]  
Disclosure of Non Current and Current Portion of the Lease Liabilities [Line Items]  
Undiscounted lease liabilities 13,928
One to five years (member)  
Disclosure of Non Current and Current Portion of the Lease Liabilities [Line Items]  
Undiscounted lease liabilities 36,540
More than 5 years [member]  
Disclosure of Non Current and Current Portion of the Lease Liabilities [Line Items]  
Undiscounted lease liabilities € 17,760