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Significant Accounting Policies - Property, plant and equipment (Details)
12 Months Ended
Dec. 31, 2019
Buildings | Minimum  
Property, Plant and Equipment  
Depreciation rates 1.00%
Buildings | Maximum  
Property, Plant and Equipment  
Depreciation rates 3.00%
Other property, technical equipment and machinery | Minimum  
Property, Plant and Equipment  
Depreciation rates 4.00%
Other property, technical equipment and machinery | Maximum  
Property, Plant and Equipment  
Depreciation rates 10.00%
Other property, plant and equipment | Minimum  
Property, Plant and Equipment  
Depreciation rates 7.00%
Other property, plant and equipment | Maximum  
Property, Plant and Equipment  
Depreciation rates 33.00%