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Commitments and Contingencies - Legal Matters (Details)
€ in Millions
1 Months Ended 3 Months Ended
Dec. 31, 2017
EUR (€)
Mar. 31, 2014
EUR (€)
Mar. 31, 2018
EUR (€)
claims
Mar. 31, 2016
EUR (€)
Legal Matters        
Matters that might have a material adverse effect on financial position, results of operations or cash flows | claims     0  
Customer claim        
Legal Matters        
Judgment issued € 3.5 € 1.9    
Payments for Legal Settlements     € 3.5  
Damages, plus interest, with the possibility of additional damages to be determined       € 1.7
Costs and Legal Fees [Member] | Customer claim        
Legal Matters        
Judgment issued € 0.1