Retirement Benefit Plans - Assumptions Used (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
U.S. Plans:
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Assumptions used calculating benefit obligation, discount rate	3.94%	4.15%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Assumptions used calculating net periodic benefit cost, discount rate	4.15%	3.89%	4.41%
Assumptions used calculating net periodic benefit cost, expected long-term return on assets	6.70%	6.71%	6.75%
Non-U.S. Plans:
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Assumptions used calculating benefit obligation, discount rate	2.25%	2.99%
Assumptions used calculating benefit obligation, rate of compensation increase	3.00%	3.01%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Assumptions used calculating net periodic benefit cost, discount rate	2.99%	2.84%	3.90%
Assumptions used calculating net periodic benefit cost, rate of compensation increase	3.01%	2.84%	2.77%
Assumptions used calculating net periodic benefit cost, expected long-term return on assets	6.41%	6.53%	6.24%
U.S. other postretirement benefit plans [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Assumptions used calculating benefit obligation, discount rate	3.61%	3.84%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Assumptions used calculating net periodic benefit cost, discount rate	3.84%	3.50%	4.00%