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Commitments and contingencies - Contingencies (Details) - Legal proceedings - EUR (€)
€ in Millions
1 Months Ended 12 Months Ended
Aug. 31, 2019
Nov. 30, 2016
Jul. 31, 2016
Oct. 31, 2014
Jul. 31, 2014
Mar. 31, 2020
Commitments and contingencies            
Litigation Settlement € 9.0 € 13.0 € 13.0 € 10.0 € 10.0  
Period of appeal proceedings           2 years