Goodwill and Other Identifiable Intangible Assets - Changes in Carrying Amount of Goodwill by Segment (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2024 USD ($)
Goodwill [Roll Forward]
Beginning Balance	$ 3,274.6
Foreign currency translation/other	(24.0)
Ending Balance	3,250.6
Water Solutions
Goodwill [Roll Forward]
Beginning Balance	1,400.6
Foreign currency translation/other	(5.0)
Ending Balance	1,395.6
Pool
Goodwill [Roll Forward]
Beginning Balance	1,106.9
Foreign currency translation/other	0.0
Ending Balance	1,106.9
Flow
Goodwill [Roll Forward]
Beginning Balance	767.1
Foreign currency translation/other	(19.0)
Ending Balance	$ 748.1