Executive and Supervisory Board Compensation - Share-Based Payment for Executive Board Members (Details) - Executive Board € in Thousands	12 Months Ended
Dec. 31, 2019 EUR (€) item	Dec. 31, 2018 EUR (€) item	Dec. 31, 2017 EUR (€) item
Share-Based Payment for Executive Board Members
Share-based payment \| €	€ 44,447	€ 8,054	€ 19,068
RSU
Share-Based Payment for Executive Board Members
Number of shares granted	137,619	118,072	117,929
PSU
Share-Based Payment for Executive Board Members
Number of shares granted	206,428	177,106	176,886

The number of instruments granted in share-based payment arrangement.

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Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration