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Employee Benefits Schedule of Allocation of Plan Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Retirement Benefits [Abstract] |
Schedule of Allocation of Plan Assets [Table Text Block] | As of December 31, 2017, the weighted-average target and actual asset allocations relating to our domestic and foreign pension plans' assets are listed below.
|  |  | December 31,
Asset Class | 2018 Target Allocation |  | 2017 |  | 2016
Alternative investments 1 | 27 | % |  | 27 | % |  | 21 | %
Equity securities | 23 | % |  | 23 | % |  | 23 | %
Fixed income securities | 21 | % |  | 21 | % |  | 26 | %
Liability driven investments 2 | 14 | % |  | 14 | % |  | 14 | %
Real estate | 6 | % |  | 6 | % |  | 6 | %
Other | 9 | % |  | 9 | % |  | 10 | %
Total | 100 | % |  | 100 | % |  | 100 | %
1 | Alternative investments have the flexibility to dynamically invest across a broad range of asset classes including bonds, equity, cash, property and commodities.
2 | Liability driven investment strategies use government bonds as well as derivative instruments to hedge a portion of the impact of interest rates and inflation movements on the long-term liabilities.

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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + 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 (d)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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