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Supplementary Data to Statement of Operations - Summary of Supplementary Data to Statements of Operations (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
Other Nonoperating Expense [Abstract] |  |  |  |  |
Asset impairment |  |  |  | $ 10.4 | $ 23.0
Environmental reserve |  |  |  | 5.9 |
Foreign currency translation expense (income) |  |  | $ 7.3 | (3.4) | 4.8
Total other expense, net | $ 2.5 | $ (6.9) | $ 7.3 | $ 12.9 | $ 27.8

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