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Pension and Post-Retirement Benefit Plans (Narrative) (Details) - Domestic Plan [Member] - Pension Plan [Member] - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Mar. 31, 2018 | Dec. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Effect of 25 Basis Point Decrease | $ 0.7 |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 6.50% | 7.50%

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- Definition Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Effect of 25 Basis Point Decrease + References No definition available. + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost 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)(3) -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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- Details
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- Details
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