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Pensions - Summary of Weighted-Average Actuarial Assumptions (Details) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
U.S. Benefit Plans |  |  |
Schedule of Net Periodic Benefit Costs Weighted Average Assumptions [Line Items] |  |  |
Discount rate | 4.30% | 4.60% | 4.20%
Rate of increase in compensation levels | 0.00% | 0.00% | 3.50%
Expected long term rate of return on plan assets | 7.10% | 7.50% | 7.80%
Non-U.S. Benefit Plan |  |  |
Schedule of Net Periodic Benefit Costs Weighted Average Assumptions [Line Items] |  |  |
Discount rate | 2.60% | 3.70% | 3.50%
Rate of increase in compensation levels | 0.00% | 0.00% | 0.00%
Expected long term rate of return on plan assets | 4.20% | 4.90% | 4.70%

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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. + 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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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512046 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Expected rate of compensation increases (for pay-related plans). + 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=65897934&loc=d3e1928-114920 + Details
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