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Equity - Treasury Stock - Tabular Disclosure - Value (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Equity    
Balance at beginning of the year € (4,696,604) € (3,633,965)
Balance at end of the year (6,845,768) (4,696,604)
Treasury stock    
Equity    
Balance at beginning of the year 55,441 62,422
Balance at end of the year 49,584 55,441
Treasury stock | Class B, Preference shares    
Equity    
Balance at beginning of the year 55,441 62,422
Disposal of shares (5,857) (6,981)
Balance at end of the year € 49,584 € 55,441