Segment Information - Reconciliation of Income from Continuing Operations from Segments to Consolidated (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting [Line Items]
Net sales	$ 1,036.7	$ 1,010.4
Cost of goods sold	(603.3)	(607.1)
Reportable segment income	210.0	203.1
Restructuring and other	(13.7)	(9.7)
Transformation costs	(11.5)	(14.3)
Asset impairment and write-offs	0.0	(5.2)
Intangible amortization	(15.7)	(14.2)
Income from continuing operations before income taxes	189.4	182.9
Operating Segments
Segment Reporting [Line Items]
Net sales	1,036.2	1,010.0
Reportable segment income	289.2	270.3
Operating Segments | Flow
Segment Reporting [Line Items]
Net sales	258.1	232.6
Cost of goods sold	(157.9)	(147.2)
Operating expenses	(39.0)	(35.2)
Reportable segment income	61.2	50.2
Operating Segments | Water Solutions
Segment Reporting [Line Items]
Net sales	391.0	393.5
Cost of goods sold	(233.4)	(239.4)
Operating expenses	(57.7)	(60.0)
Reportable segment income	99.9	94.1
Operating Segments | Pool
Segment Reporting [Line Items]
Net sales	387.1	383.9
Cost of goods sold	(211.2)	(213.8)
Operating expenses	(47.8)	(44.1)
Reportable segment income	128.1	126.0
Corporate and other
Segment Reporting [Line Items]
Net sales	0.5	0.4
Reportable segment income	(30.1)	(27.8)
Reconciling items
Segment Reporting [Line Items]
Restructuring and other	(21.4)	(10.5)
Transformation costs	(11.5)	(9.1)
Asset impairment and write-offs		(5.2)
Intangible amortization	(15.7)	(14.2)
Interest expense, net	(20.1)	(19.7)
Other expense	(1.0)	(0.9)
Income from continuing operations before income taxes	$ 189.4	$ 182.9