Postretirement benefits Schedule of Assumptions Used to determine net periodic benefit costs(Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Pension Plan [Member] | UNITED STATES
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Rate of Compensation Increase	4.00%
Expected Long-term Return on Assets	7.00%
Pension Plan [Member] | UNITED STATES | Service Cost [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount Rate	4.38%
Pension Plan [Member] | UNITED STATES | Interest Cost [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount Rate	3.59%
Pension Plan [Member] | Non-US [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount Rate		3.51%	4.21%
Rate of Compensation Increase	3.33%	3.09%	3.43%
Expected Long-term Return on Assets	4.79%	4.81%	5.34%
Pension Plan [Member] | Non-US [Member] | Service Cost [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount Rate	3.85%
Pension Plan [Member] | Non-US [Member] | Interest Cost [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount Rate	3.44%
Other Postretirement Benefit Plan [Member] | UNITED STATES
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Expected Long-term Return on Assets	6.34%
Other Postretirement Benefit Plan [Member] | UNITED STATES | Service Cost [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount Rate	4.56%
Other Postretirement Benefit Plan [Member] | UNITED STATES | Interest Cost [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount Rate	3.82%
Other Postretirement Benefit Plan [Member] | Non-US [Member] | Service Cost [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount Rate	4.30%
Other Postretirement Benefit Plan [Member] | Non-US [Member] | Interest Cost [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount Rate	4.30%