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Related parties (Details) - EUR (€)
€ in Millions
3 Months Ended 9 Months Ended
Jan. 02, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Non-Executive Director          
Disclosure of transactions between related parties [line items]          
Fees and expenses   € 0.1 € 0.2 € 0.3 € 0.4
Ordinary shares | Founder Entities          
Disclosure of transactions between related parties [line items]          
Founder preferred shares annual dividend amount (in shares) 171,092        
Mariposa Capital and TOMS Capital | Affiliate of Founder Entities          
Disclosure of transactions between related parties [line items]          
Fees and expenses   € 0.5 € 0.4 € 1.7 € 1.5