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Revenue - Disaggregation of Revenue (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disaggregation of Revenue [Line Items]        
Net sales $ 1,380.8 $ 1,348.6 $ 4,064.4 $ 3,900.8
Wholesalers [Member]        
Disaggregation of Revenue [Line Items]        
Net sales [1] 661.7   1,930.4  
Home Center Retailers [Member]        
Disaggregation of Revenue [Line Items]        
Net sales [2] 344.6   1,069.3  
Other Retailers [Member]        
Disaggregation of Revenue [Line Items]        
Net sales [3] 79.8   237.0  
Builder Direct [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 60.9   171.0  
United States [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 1,147.0   3,407.7  
International [Member]        
Disaggregation of Revenue [Line Items]        
Net sales [4] $ 233.8   $ 656.7  
[1] Represents sales to customers whose business is oriented towards builders, professional trades and home remodelers, inclusive of sales through our customers' respective internet website portals.
[2] Represents sales to the three largest "Do-It-Yourself" retailers; The Home Depot, Inc., Lowes Companies, Inc. and Menards, Inc., inclusive of sales through their respective internet website portals.
[3] Represents sales principally to our mass merchant and standalone independent e-commerce customers.
[4] Represents sales in markets outside the United States, principally in China, Canada, Europe and Mexico.