Retirement Benefits Plans - Pension Plans Assumptions (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
United States pension plans [Member]
Assumptions used to determine benefit obligation at year-end
Discount rate	4.12%	4.22%	3.97%
Rate of compensation increase	3.15%	3.18%	3.16%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate To Determine Benefit Obligation	4.22%	3.97%	4.67%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate To Determine Service Costs	4.35%	3.97%	4.67%
Assumptions used to determine expense
Discount rate	3.42%	3.97%	4.67%
Expected long-term return on plan assets	8.50%	8.50%	8.40%
Rate of compensation increase	3.18%	3.16%	3.16%
Non-United States pension plans [Member]
Assumptions used to determine benefit obligation at year-end
Discount rate	2.63%	3.46%	3.33%
Rate of compensation increase	3.13%	3.12%	3.13%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate To Determine Benefit Obligation	3.46%	3.33%	4.20%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate To Determine Service Costs	4.13%	3.33%	4.20%
Assumptions used to determine expense
Discount rate	3.07%	3.33%	4.20%
Expected long-term return on plan assets	6.62%	6.92%	7.00%
Rate of compensation increase	3.12%	3.13%	3.12%