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Employee benefit plans - Defined benefit pension plans (Details) - Pension defined benefit plans
€ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2019
EUR (€)
Sep. 30, 2019
EUR (€)
Defined benefit pension plans    
Number of defined benefit plans   5
United States    
Defined benefit pension plans    
Number of defined benefit plans   1
United States | FMCH    
Defined benefit pension plans    
Company contribution to plan   € 847
Estimate of contributions expected to be paid to plan for rest of year € 294  
France    
Defined benefit pension plans    
Number of defined benefit plans   3
Germany    
Defined benefit pension plans    
Number of defined benefit plans   1