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Revenue - Disaggregation of Revenue (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]      
Net sales $ 6,090.3 $ 5,764.6 $ 5,485.1
Wholesalers [Member]      
Disaggregation of Revenue [Line Items]      
Net sales [1] 2,720.6 2,682.8 2,607.3
Home Center retailers [Member]      
Disaggregation of Revenue [Line Items]      
Net sales [2] 1,808.1 1,606.7 1,452.3
Other retailers [Member]      
Disaggregation of Revenue [Line Items]      
Net sales [3] 345.6 304.8 311.6
Builder direct [Member]      
Disaggregation of Revenue [Line Items]      
Net sales 220.0 229.4 235.4
United States [Member]      
Disaggregation of Revenue [Line Items]      
Net sales 5,094.3 4,823.7 4,606.6
International [Member]      
Disaggregation of Revenue [Line Items]      
Net sales [4] $ 996.0 $ 940.9 $ 878.5
[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.