Summary of Significant Accounting Policies (Useful Lives of Property, Plant and Equipment) (Details)	12 Months Ended
	Dec. 31, 2017
Buildings and leasehold improvements | Minimum
Property, Plant and Equipment [Line Items]
Useful life	15 years
Buildings and leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Useful life	50 years
Office furniture, fittings and equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful life	3 years
Office furniture, fittings and equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful life	10 years
Machinery, equipment and other | Minimum
Property, Plant and Equipment [Line Items]
Useful life	3 years
Machinery, equipment and other | Maximum
Property, Plant and Equipment [Line Items]
Useful life	15 years