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Retirement and Other Postretirement Benefit Plans - Schedule of Actual Allocations for the Pension Assets and Target Allocations by Asset Class (Details) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Change in plan assets: |  |
Percentage Of Plan Assets | 100.00% | 100.00%
Target Allocations | 100.00% | 100.00%
Diversified Growth Funds |  |
Change in plan assets: |  |
Percentage Of Plan Assets | 23.80% | 24.10%
Target Allocations | 28.10% | 29.00%
Index Linked Gilts |  |
Change in plan assets: |  |
Percentage Of Plan Assets | 25.80% | 21.10%
Target Allocations | 12.60% | 13.00%
Liability Driven Investments |  |
Change in plan assets: |  |
Percentage Of Plan Assets | 19.20% | 20.10%
Target Allocations | 23.20% | 24.00%
All Other Regions Equity Fund |  |
Change in plan assets: |  |
Percentage Of Plan Assets | 16.60% | 18.70%
Target Allocations | 19.60% | 34.00%
U.K. Equity Fund |  |
Change in plan assets: |  |
Percentage Of Plan Assets | 11.20% | 12.60%
Target Allocations | 13.30% |
Diversified Investment, Funds |  |
Change in plan assets: |  |
Percentage Of Plan Assets | 1.20% | 1.20%
Target Allocations | 1.20% |
Other Insurance Product Line |  |
Change in plan assets: |  |
Percentage Of Plan Assets | 2.10% | 2.10%
Target Allocations | 2.00% |
Cash and Cash Equivalents |  |
Change in plan assets: |  |
Percentage Of Plan Assets | 0.10% | 0.10%

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- Definition The aggregate percentage of the targeted fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of total plan assets held as of the measurement date. + References No definition available. + Details
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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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