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Goodwill and Intangibles - Additional Information (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Amortization € (8.6) € (7.0) € (6.5)
Discount rate 7.10% 8.20%  
Long-term growth rate 1.00% 1.00%  
Accumulated depreciation and impairment      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Amortization € 8.6 € 7.0 € 6.5