Segment Information - Financial Information by Reportable Segment (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Net sales	$ 1,099.3	$ 1,082.5	$ 2,116.5	$ 2,111.1
Reportable segments
Segment Reporting Information [Line Items]
Net sales	1,098.8	1,082.1	2,115.7	2,110.2
Corporate and other
Segment Reporting Information [Line Items]
Net sales	0.5	0.4	0.8	0.9
Flow | Reportable segments
Segment Reporting Information [Line Items]
Net sales	396.8	411.6	781.1	803.4
Water Solutions | Reportable segments
Segment Reporting Information [Line Items]
Net sales	310.5	336.2	583.6	608.2
Pool | Reportable segments
Segment Reporting Information [Line Items]
Net sales	$ 391.5	$ 334.3	$ 751.0	$ 698.6