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Acquisitions, investments, purchases of intangible assets and divestitures - Investments Proceeds from divestitures (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Investments and Purchases of Intangible Assets      
Investments and purchases of intangible assets, total purchase consideration € 72,574 € 676,160 € 44,369
Cash consideration 72,574 675,302 44,369
Divestitures      
Proceeds from divestitures 79,427 1,683,292 437,031
Cash portion of proceeds from divestitures 59,940 1,682,975 415,388
Non-cash portion of proceeds from divestitures € 19,487 € 317 € 21,643