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Balance Sheet Information - Supplemental Information on Balance Sheets (Detail) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Inventories:    
Raw materials and supplies $ 273.1 $ 224.9
Work in process 58.4 58.3
Finished products 352.8 297.6
Total inventories [1] 684.3 580.8
Property, plant and equipment, gross 1,873.5 1,780.4
Less: accumulated depreciation 1,097.2 1,040.4
Property, plant and equipment, net $ 776.3 $ 740.0
[1] Includes $56.0 million in inventory related to Fiberon acquisition.