Retirement Benefit Plans (Assumptions Used in Accounting for Defined Benefit Plans) (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
U.S. Plan
Defined Benefit Plan Disclosure [Line Items]
Discount rate for pension benefit obligation	2.88%	4.00%	3.30%
Discount rate for net periodic benefit income	4.00%	3.30%	3.60%
Expected long-term rate of return on assets for net periodic pension income	7.50%	7.50%	7.50%
Non-U.S. Plan
Defined Benefit Plan Disclosure [Line Items]
Discount rate for pension benefit obligation	2.96%	3.50%	3.25%
Discount rate for net periodic benefit income	3.50%	3.50%	3.75%
Expected long-term rate of return on assets for net periodic pension income	5.50%	5.50%	5.50%