Pension, Other Postretirement Benefits and Savings Plans - Weighted Average Assumptions Used (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
United States | Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate, benefit obligations	3.56%	3.99%
Discount rate for determining interest costs, benefit costs	3.18%	3.23%	3.89%
Expected long term return on plan assets, benefit costs	5.08%	5.33%	5.00%
United States | Other Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate, benefit obligations	3.44%	3.72%
Discount rate for determining interest costs, benefit costs	3.02%	2.98%	3.59%
Non-U.S. | Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate, benefit obligations	2.53%	2.72%
Rate of compensation increase, benefit obligations	2.91%	3.18%
Discount rate for determining interest costs, benefit costs	2.70%	3.37%	3.31%
Expected long term return on plan assets, benefit costs	3.12%	3.81%	4.12%
Rate of compensation increase, benefit cost	3.18%	2.63%	2.88%
Non-U.S. | Other Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate, benefit obligations	4.92%	5.12%
Discount rate for determining interest costs, benefit costs	5.98%	6.31%	4.89%