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Financial Risk Management Policy - Capital Management (Details) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Financial Risk Management Policy |  |  |
Profit attributable to the Parent | € 625,146 | € 596,642 | € 662,700
Equity attributable to the Parent | € 4,822,119 | € 4,225,554 |
Return on equity | 13.00% | 14.00% |
Treasury stock as a percentage of capital, held by parent | 0.50% | 0.60% |

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