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Commitments and Contingencies Asbestos Claimant and Settlement (Details) - Asbestos [Member] | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) claimants | Dec. 31, 2017 USD ($) claimants | Dec. 31, 2016 claimants
Loss Contingencies [Line Items] |  |  |
Loss Contingency, Pending Claims, Number | 4,833 | 5,256 | 5,339
Loss Contingency, New Claims Filed, Number | 123 | 173 |
Loss Contingency, Claims Dismissed, Number | 517 | 231 |
Loss Contingency, Claims Settled, Number | 29 | 25 |
Average settlement amount per claim during period | $ | $ 7,603 | $ 8,930 |
Total defense costs during period | $ | $ 1,718,100 | $ 2,280,000 |

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- Definition The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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- Definition Number of claims dismissed. + References No definition available. + Details
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- Definition The total number of new claims filed pertaining to a loss contingency during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349 + Details
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