Information on Business Segments - Net Sales and Operating Income by Segment (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	$ 1,375.8	$ 1,507.2	$ 2,778.5	$ 2,835.1
Operating income	$ 173.0	202.4	$ 328.0	338.0
Net Sales, Percentage Change vs. Prior Year	(8.70%)		(2.00%)
Operating Income, Percentage Change vs. Prior Year	(14.50%)		(3.00%)
Corporate [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income	$ (19.0)	(20.0)	$ (43.7)	(39.2)
Operating Income, Percentage Change vs. Prior Year	5.00%		(11.50%)
Cabinets [Member] \| Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	$ 538.7	635.0	$ 1,158.7	1,208.0
Operating income	$ 37.3	65.7	$ 81.0	108.9
Net Sales, Percentage Change vs. Prior Year	(15.20%)		(4.10%)
Operating Income, Percentage Change vs. Prior Year	(43.20%)		(25.60%)
Plumbing [Member] \| Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	$ 504.8	506.1	$ 973.8	964.7
Operating income	$ 109.5	106.7	$ 214.0	195.9
Net Sales, Percentage Change vs. Prior Year	(0.30%)		0.90%
Operating Income, Percentage Change vs. Prior Year	2.60%		9.20%
Doors & Security [Member] \| Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	$ 332.3	366.1	$ 646.0	662.4
Operating income	$ 45.2	$ 50.0	$ 76.7	$ 72.4
Net Sales, Percentage Change vs. Prior Year	(9.20%)		(2.50%)
Operating Income, Percentage Change vs. Prior Year	(9.60%)		5.90%