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Income tax - Tax losses available for offsetting (Details) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of geographical areas [line items] |  |  |
Tax Rate | 27.85% | 27.39% | 29.04%
Accumulated tax loss (gross) | € (549,863) | € (527,754) | € (358,499)
Germany |  |  |
Disclosure of geographical areas [line items] |  |  |
Tax Rate | 30.20% |  |
Accumulated tax loss (gross) | € (26,235) | (8,961) |
Corporate Income Tax Rate | 15.80% |  |
Trade Tax Rate | 14.40% |  |
Accumulated tax losses related to trade tax | € 45,258 |  |
Morocco |  |  |
Disclosure of geographical areas [line items] |  |  |
Number of years for carryforward of tax losses | 4 years |  |
Tax Rate | 31.00% |  |
Accumulated tax loss (gross) | € (28,141) | (25,342) | (25,848)
Egypt |  |  |
Disclosure of geographical areas [line items] |  |  |
Number of years for carryforward of tax losses | 5 years |  |
Tax Rate | 22.50% |  |
Accumulated tax loss (gross) | € (107,831) | (90,148) | (61,942)
Nigeria |  |  |
Disclosure of geographical areas [line items] |  |  |
Tax Rate | 30.00% |  |
Accumulated tax loss (gross) | € (202,353) | (203,482) | (145,143)
South Africa |  |  |
Disclosure of geographical areas [line items] |  |  |
Tax Rate | 28.00% |  |
Accumulated tax loss (gross) | € (38,204) | (34,327) | (28,267)
Kenya |  |  |
Disclosure of geographical areas [line items] |  |  |
Number of years for carryforward of tax losses | 9 years |  |
Tax Rate | 30.00% |  |
Accumulated tax loss (gross) | € (64,236) | (64,812) | (39,135)
Ivory Coast |  |  |
Disclosure of geographical areas [line items] |  |  |
Number of years for carryforward of tax losses | 5 years |  |
Tax Rate | 25.00% |  |
Accumulated tax loss (gross) | € (27,975) | (27,005) | (19,962)
Ghana |  |  |
Disclosure of geographical areas [line items] |  |  |
Number of years for carryforward of tax losses | 3 years |  |
Tax Rate | 25.00% |  |
Accumulated tax loss (gross) | € (8,255) | (9,848) | (5,228)
Other |  |  |
Disclosure of geographical areas [line items] |  |  |
Accumulated tax loss (gross) | € (46,633) | € (63,829) | € (32,974)

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