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Retirement Plans (Plan Asset Investment Allocation Percentage) (Details) - Pension Plan | Dec. 31, 2017 | Dec. 31, 2016
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UNITED STATES |  |
Asset Category |  |
Percentage of plan assets | 100.00% | 100.00%
UNITED STATES | Cash and cash equivalents |  |
Asset Category |  |
Percentage of plan assets | 2.00% | 5.00%
UNITED STATES | Cash and cash equivalents | Minimum |  |
Asset Category |  |
Targets percentage of plan assets | 0.00% |
UNITED STATES | Cash and cash equivalents | Maximum |  |
Asset Category |  |
Targets percentage of plan assets | 10.00% |
UNITED STATES | Total fixed income funds |  |
Asset Category |  |
Percentage of plan assets | 32.00% | 33.00%
UNITED STATES | Total fixed income funds | Minimum |  |
Asset Category |  |
Targets percentage of plan assets | 25.00% |
UNITED STATES | Total fixed income funds | Maximum |  |
Asset Category |  |
Targets percentage of plan assets | 50.00% |
UNITED STATES | Total mutual funds and equities |  |
Asset Category |  |
Percentage of plan assets | 66.00% | 62.00%
UNITED STATES | Total mutual funds and equities | Minimum |  |
Asset Category |  |
Targets percentage of plan assets | 50.00% |
UNITED STATES | Total mutual funds and equities | Maximum |  |
Asset Category |  |
Targets percentage of plan assets | 70.00% |
Foreign Plan | Cash and cash equivalents | Maximum |  |
Asset Category |  |
Targets percentage of plan assets | 100.00% |
Foreign Plan | Equity securities | Maximum |  |
Asset Category |  |
Targets percentage of plan assets | 100.00% |
Foreign Plan | Commercial property | Maximum |  |
Asset Category |  |
Targets percentage of plan assets | 50.00% |
Foreign Plan | U.K. Government securities | Maximum |  |
Asset Category |  |
Targets percentage of plan assets | 50.00% |

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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one 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 (d)(5)(i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + 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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