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Revenue - Disaggregation of Revenue (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disaggregation of Revenue [Line Items]    
Net sales $ 1,254.6 $ 1,186.8
Wholesalers [Member]    
Disaggregation of Revenue [Line Items]    
Net sales [1] 585.6  
Home Center Retailers [Member]    
Disaggregation of Revenue [Line Items]    
Net sales [2] 349.7  
Other Retailers [Member]    
Disaggregation of Revenue [Line Items]    
Net sales [3] 76.1  
Builder Direct [Member]    
Disaggregation of Revenue [Line Items]    
Net sales 51.5  
United States [Member]    
Disaggregation of Revenue [Line Items]    
Net sales 1,062.9  
International [Member]    
Disaggregation of Revenue [Line Items]    
Net sales [4] $ 191.7  
[1] Represents sales to customers whose business is oriented towards builders, professional trades and home remodelers, inclusive of sales through our customer's 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.