Retirement Benefit Plans - Assumptions (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Americas [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	4.10%	3.40%	3.75%
Expected long-term rate of return on assets	7.50%	7.50%	7.50%
Foreign Plan [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	1.13%	0.88%	0.86%
Rate of increase in compensation levels - maximum	2.20%	1.50%	1.50%
Expected long-term rate of return on assets	1.80%	1.70%	3.00%
Foreign Plan [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	2.65%	2.40%	2.50%
Rate of increase in compensation levels - maximum	2.50%	2.50%	2.50%
Expected long-term rate of return on assets	7.00%	7.00%	7.00%