Segment Information - Reconciliation of Income from Continuing Operations from Segments to Consolidated (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	$ 1,022.0	$ 993.4	$ 3,155.5	$ 3,109.9
Cost of goods sold	(603.4)	(600.2)	(1,877.0)	(1,888.7)
Reportable segment income	231.7	179.9	652.5	608.7
Restructuring and other	(1.1)	(28.3)	(26.3)	(38.6)
Transformation costs	(11.5)	(15.4)	(48.6)	(44.2)
Asset impairment and write-offs			(48.5)	(9.3)
Loss on sale of business	0.0	0.0	(26.3)	0.0
Intangible amortization	(13.9)	(13.5)	(42.4)	(40.4)
Income from continuing operations before income taxes	216.7	160.2	572.1	534.5
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	1,021.6	993.1	3,154.4	3,108.8
Reportable segment income	279.9	259.9	866.2	794.5
Operating Segments | Flow
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	394.0	372.2	1,159.2	1,153.3
Cost of goods sold	(240.7)	(235.0)	(715.8)	(732.1)
Operating expenses	(58.0)	(54.4)	(171.4)	(176.7)
Reportable segment income	95.3	82.8	272.0	244.5
Operating Segments | Water Solutions
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	273.3	289.5	829.8	873.1
Cost of goods sold	(165.9)	(180.8)	(507.5)	(547.1)
Operating expenses	(39.0)	(44.3)	(123.0)	(133.1)
Reportable segment income	68.4	64.4	199.3	192.9
Operating Segments | Pool
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	354.3	331.4	1,165.4	1,082.4
Cost of goods sold	(195.5)	(181.4)	(638.3)	(604.4)
Operating expenses	(42.6)	(37.3)	(132.2)	(120.9)
Reportable segment income	116.2	112.7	394.9	357.1
Corporate and other
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	0.4	0.3	1.1	1.1
Reportable segment income	(17.3)	(20.7)	(64.4)	(66.6)
Reconciling items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Restructuring and other	(0.2)	(23.4)	(21.1)	(33.9)
Transformation costs	(10.8)	(12.6)	(32.4)	(41.4)
Asset impairment and write-offs	(1.5)	(8.5)	(48.5)	(9.3)
Loss on sale of business			(26.3)
Deal-related costs and expenses	(4.1)		(4.1)
Legal accrual adjustments and settlements		(0.7)		7.5
Intangible amortization	(13.9)	(13.5)	(42.4)	(40.4)
Interest expense, net	(14.4)	(19.8)	(52.0)	(73.4)
Other expense	(1.0)	(0.5)	(2.9)	(2.5)
Income from continuing operations before income taxes	$ 216.7	$ 160.2	$ 572.1	$ 534.5