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Trade Payables and Other Current Liabilities - Additional information (Details) - EUR (€)
€ in Millions
Oct. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Aug. 17, 2018
Provision for CIR risk related to tax audit for the years ended December 31, 2013, 2014 and 2015        
TradePayablesAndOtherCurrentLiabilities [line items]        
Payables For Payroll Taxes     € 1.9 € 1.9
Provision for tax audit for the years ended December 31, 2016 and December 31, 2017        
TradePayablesAndOtherCurrentLiabilities [line items]        
Payables For Payroll Taxes € 1.2 € 1.2