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Supplementary Data to Statement of Operations - Additional Information (Detail) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Organization Consolidation And Presentation Of Financial Statements [Abstract] |  |  |  |  |
Other (income) expense, net | $ (2.5) | $ 6.9 | $ (7.3) | $ (12.9) | $ (27.8)
Increase in environmental reserve |  |  |  | 5.9 |
Foreign currency translation expense (income) |  |  | $ 7.3 | (3.4) | 4.8
UK Business [Member] |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Abstract] |  |  |  |  |
Impairment charge on trade name intangible asset |  |  |  | $ 10.2 | $ 22.6

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- Definition Amount of income (expense) related to nonoperating activities, classified as other. + 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 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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