Employee Benefit Plans Measurement Assumptions (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017 Rate	Dec. 31, 2016
Other Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans
Discount Rate Assumptions Used Calculating Benefit Obligation	3.70%	3.70%	4.20%
Discount Rate Assumptions Used Calculating Net Periodic Benefit Cost	4.20%		4.70%
Expected Long-term Return on Assets Assumptions Used Calculating Net Periodic Benefit Cost	5.75%	5.75%	5.75%
Domestic Plan | Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans
Discount Rate Assumptions Used Calculating Benefit Obligation	3.80%	3.80%	4.40%
Discount Rate Assumptions Used Calculating Net Periodic Benefit Cost	4.40%		4.80%
Expected Long-term Return on Assets Assumptions Used Calculating Net Periodic Benefit Cost	7.25%		7.50%
Foreign Plan | Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans
Discount Rate Assumptions Used Calculating Benefit Obligation	2.50%	2.50%	2.70%
Rate of Compensation Increase Assumptions Used Calculating Benefit Obligation	3.70%	3.70%	3.80%
Discount Rate Assumptions Used Calculating Net Periodic Benefit Cost	2.70%		3.80%
Expected Long-term Return on Assets Assumptions Used Calculating Net Periodic Benefit Cost	3.90%		4.90%
Rate of Compensation Increase Assumptions Used Calculating Net Periodic Benefit Cost	3.80%		3.60%