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Accounting Policies - Property, Plant and Equipment and Depreciation (Details)
12 Months Ended
Dec. 31, 2017
Buildings  
Property, Plant and Equipment [Line Items]  
Estimated useful life 40 years
Machinery and equipment | Minimum  
Property, Plant and Equipment [Line Items]  
Estimated useful life 16 years
Machinery and equipment | Maximum  
Property, Plant and Equipment [Line Items]  
Estimated useful life 20 years
Computer software costs | Minimum  
Property, Plant and Equipment [Line Items]  
Estimated useful life 3 years
Computer software costs | Maximum  
Property, Plant and Equipment [Line Items]  
Estimated useful life 5 years