Retirement Benefits - Weighted Average Assumptions Used in the Measurement Of Benefit Obligation (Details) - Pension Benefit Plan	Dec. 31, 2017	Dec. 31, 2016
U.S. Plans
Schedule of Benefit Obligations Weighted Average Assumptions [Line Items]
Discount rate	3.46%	3.91%
Rate of compensation increase	4.00%	4.00%
Non-U.S. Plans
Schedule of Benefit Obligations Weighted Average Assumptions [Line Items]
Discount rate	1.82%	1.76%
Rate of compensation increase	2.37%	2.29%

Schedule of Benefit Obligations Weighted Average Assumptions [Line Items]

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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

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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

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