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Retirement Benefits (Details 3) | Dec. 31, 2017 | Dec. 31, 2016
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Pension Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount rate | 3.85% | 4.45%
Rate of increase in future compensation levels |  | 1.00%
Pension Benefits [Member] | Minimum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Rate of increase in future compensation levels | 0.50% |
Pension Benefits [Member] | Maximum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Rate of increase in future compensation levels | 1.00% |
Other Postretirement Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount rate | 3.80% | 4.35%
Rate of increase in future compensation levels | 0.00% | 0.00%

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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 + Details
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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 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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