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Summary of Significant Accounting Policies (Property, Plant and Equipment Narrative) (Details)
12 Months Ended
Dec. 31, 2020
Buildings | Minimum  
Property, Plant and Equipment [Line Items]  
Estimated useful life 20 years
Buildings | Maximum  
Property, Plant and Equipment [Line Items]  
Estimated useful life 30 years
Machinery and equipment | Minimum  
Property, Plant and Equipment [Line Items]  
Estimated useful life 3 years
Machinery and equipment | Maximum  
Property, Plant and Equipment [Line Items]  
Estimated useful life 10 years