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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