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Retirement Benefits (Details 3) | Dec. 31, 2018 | Dec. 31, 2017
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Pension Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount rate | 4.40% | 3.85%
Pension Benefits [Member] | Minimum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Rate of increase in future compensation levels | 0.50% | 0.50%
Pension Benefits [Member] | Maximum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Rate of increase in future compensation levels | 1.00% | 1.00%
Other Postretirement Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount rate | 4.35% | 3.80%
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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=108410482&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=108410482&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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