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Significant Accounting Policies - Useful Lives Applied to the Group's Right-of-use Assets (Details)
 12 Months Ended
Dec. 31, 2020
Minimum | Buildings  
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]  
Right-of-use assets, Useful life (Years) 2 years
Minimum | Equipment, Tools and Installations  
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]  
Right-of-use assets, Useful life (Years) 2 years
Minimum | Production Facilities  
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]  
Right-of-use assets, Useful life (Years) 2 years
Minimum | Automobiles  
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]  
Right-of-use assets, Useful life (Years) 3 years
Maximum | Buildings  
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]  
Right-of-use assets, Useful life (Years) 25 years
Maximum | Equipment, Tools and Installations  
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]  
Right-of-use assets, Useful life (Years) 5 years
Maximum | Production Facilities  
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]  
Right-of-use assets, Useful life (Years) 3 years
Maximum | Automobiles  
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]  
Right-of-use assets, Useful life (Years) 4 years