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Other Expense, Net - Components of Other Expense Net (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Component Of Other Expense Income Nonoperating [Line Items]      
Asset impairment charges     $ 1.6
Other items, net $ 1.5 $ 4.3 (0.4)
Total other expense (income), net $ 1.5 $ 4.3 $ 1.2