Revenue - Disaggregation of Revenue (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items]
Net sales	$ 5,485.1
Wholesalers [Member]
Disaggregation of Revenue [Line Items]
Net sales	2,607.3	[1]
Home Center Retailers [Member]
Disaggregation of Revenue [Line Items]
Net sales	1,452.3	[2]
Other Retailers [Member]
Disaggregation of Revenue [Line Items]
Net sales	311.6	[3]
Builder Direct [Member]
Disaggregation of Revenue [Line Items]
Net sales	235.4
United States [Member]
Disaggregation of Revenue [Line Items]
Net sales	4,606.6
International [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 878.5	[4]

[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 Canada, China, Europe and Mexico.