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Significant Accounting Policies - Useful Lives Applied to the Group's Property, Plant and Equipment (Details)
 12 Months Ended
Dec. 31, 2020
Buildings | Minimum  
Disclosure Of Property Plant And Equipment [Line Items]  
Property, plant and equipment, Useful life (Years) 7 years
Buildings | Maximum  
Disclosure Of Property Plant And Equipment [Line Items]  
Property, plant and equipment, Useful life (Years) 33 years
Equipment, Tools and Installations | Minimum  
Disclosure Of Property Plant And Equipment [Line Items]  
Property, plant and equipment, Useful life (Years) 3 years
Equipment, Tools and Installations | Maximum  
Disclosure Of Property Plant And Equipment [Line Items]  
Property, plant and equipment, Useful life (Years) 15 years