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Pensions - Summary of Weighted-Average Assumptions Used in Determining Benefit Obligations (Details) | Dec. 31, 2017 | Dec. 31, 2016
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U.S. Benefit Plans |  |
Schedule of Net Periodic Benefit Costs Weighted Average Assumptions [Line Items] |  |
Discount rate | 3.70% | 4.30%
Non-U.S. Benefit Plan |  |
Schedule of Net Periodic Benefit Costs Weighted Average Assumptions [Line Items] |  |
Discount rate | 2.50% | 2.60%

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- Definition Schedule of Net Periodic Benefit Costs Weighted Average Assumptions [Line Items] + References No definition available. + Details
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- Definition The interest rate used to adjust for the time value of money for the 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=65897934&loc=d3e1928-114920 + Details
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