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Information on Business Segments - Net Sales and Operating Income by Segment (Parenthetical) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Purchases of property,plant and equipment not yet paid $ 11.9 $ 20.0 $ 4.2