Segment Information - Financial Information by Reportable Segment (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Net sales	$ 993.4	$ 1,008.8	$ 3,109.9	$ 3,119.9
Reportable segments
Segment Reporting Information [Line Items]
Net sales	993.1	1,008.4	3,108.8	3,118.6
Corporate and other
Segment Reporting Information [Line Items]
Net sales	0.3	0.4	1.1	1.3
Flow | Reportable segments
Segment Reporting Information [Line Items]
Net sales	372.2	400.2	1,153.3	1,203.6
Water Solutions | Reportable segments
Segment Reporting Information [Line Items]
Net sales	289.5	299.4	873.1	907.6
Pool | Reportable segments
Segment Reporting Information [Line Items]
Net sales	$ 331.4	$ 308.8	$ 1,082.4	$ 1,007.4