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Taxation - Deferred Tax Assets and Liabilities by Jurisdiction (Details) - EUR (€) € in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax | € (340,803) | € (291,859) | € (322,755) | € (533,427)
United States |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax | (337,700) | (306,394) | (310,165) |
Spain |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax | 31,521 | 28,585 | 22,830 |
Others |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax | (34,624) | (14,050) | (35,420) |
Net deferred tax |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax | (463,078) | (402,817) | (393,786) |
Net deferred tax | United States |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax | (392,040) | (353,116) | (325,550) |
Net deferred tax | Spain |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax | (35,117) | (34,441) | (32,396) |
Net deferred tax | Others |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax | (35,921) | (15,260) | (35,840) |
Tax credit rights |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax | 60,799 | 53,601 | 21,564 |
Tax credit rights | United States |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax | 54,340 | 46,722 | 15,385 |
Tax credit rights | Spain |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax | 5,162 | 5,669 | 5,759 |
Tax credit rights | Others |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax | 1,297 | 1,210 | 420 |
Tax loss carryforwards |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax | 61,476 | 57,357 | 49,467 |
Tax loss carryforwards | Spain |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax | € 61,476 | € 57,357 | € 49,467 |

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