Basis of Presentation and Summary of Significant Accounting Policies - Net Sales Information (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Net sales	[1]	$ 4,104.5	$ 4,121.8	$ 3,764.8
Residential
Disaggregation of Revenue [Line Items]
Net sales		2,134.0	2,613.6	2,437.6
Commercial
Disaggregation of Revenue [Line Items]
Net sales		1,177.2	809.1	665.9
Industrial
Disaggregation of Revenue [Line Items]
Net sales		793.3	699.1	661.3
U.S.
Disaggregation of Revenue [Line Items]
Net sales		2,835.9	2,913.2	2,571.2
Western Europe
Disaggregation of Revenue [Line Items]
Net sales		471.9	439.2	460.4
Developing
Disaggregation of Revenue [Line Items]
Net sales		558.0	515.5	487.1
Other Developed
Disaggregation of Revenue [Line Items]
Net sales		$ 238.7	$ 253.9	$ 246.1

[1] (1) One customer in the Pool business represented approximately 15% of our consolidated net sales in 2023 and 20% of our consolidated net sales in both 2022 and 2021.