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Property, Plant and Equipment - Impairment (Details) - Specific Group of Assets Hospital Segment - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Impairment    
Impairment € 0 € 0
Pre-tax discount rate 10.30% 10.10%
Perpetual growth rate 2.00% 2.00%