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Income Tax - Summary of Accumulated Tax Losses (Details) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Abstract]
Corporate Tax	€ 596,359	€ 356,044	€ 179,264
Trade Tax	513,561	€ 352,341	€ 176,425
Federal Tax Credits	756
State Tax Credits	€ 250

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- Definition

Accumulated tax losses in corporate tax.

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- Definition

Accumulated tax losses in federal tax credits.

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- Definition

Accumulated tax losses in state tax credits.

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- Definition

Accumulated tax losses in trade tax.

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