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Expenses by Nature - Other Operating Income and Expenses (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Other operating income and expenses by function      
Other operating income and expenses, cost of sales € 467,705 € 432,803 € 416,020
Other operating income and expenses, research and development 166,177 152,670 129,579
Other operating income and expenses, selling, general & administration expenses 457,921 410,753 460,959
Total other operating income and expenses € 1,091,803 € 996,226 € 1,006,558