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Postretirement benefits Schedule of assumptions used to determine benefit obligation (Details) | Dec. 31, 2017 | Dec. 31, 2016
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Pension Plan [Member] | UNITED STATES |  |
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] |  |
Benefit Obligation, Discount Rate | 3.59% | 4.14%
Benefit Obligation, Rate of Compensation Increase | 4.00% | 4.00%
Pension Plan [Member] | Non-US [Member] |  |
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] |  |
Benefit Obligation, Discount Rate | 2.76% | 2.83%
Benefit Obligation, Rate of Compensation Increase | 3.46% | 3.57%
Other Postretirement Benefits Plan [Member] |  |
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] |  |
Benefit Obligation, Discount Rate | 2.77% | 2.97%

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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