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Retirement Benefits (Details 3) | Dec. 31, 2016 | Dec. 31, 2015
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Pension Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount rate | 4.45% | 4.65%
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 |  | 3.00%
Pension Benefits [Member] | Maximum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Rate of increase in future compensation levels |  | 3.50%
Other Postretirement Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount rate | 4.35% | 4.50%
Rate of increase in future compensation levels | 0.00% | 0.00%

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- Definition The interest rate used to adjust for the time value of money for the 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=65897934&loc=d3e1928-114920 + Details
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- Definition Expected rate of compensation increases (for pay-related plans). + 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=65897934&loc=d3e1928-114920 + Details
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