Goodwill and Other Identifiable Intangible Assets - Changes in Carrying Amount of Goodwill by Segment (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2016 USD ($)
Goodwill [Roll Forward]
Beginning Balance	$ 5,255.4
Goodwill, Purchase Accounting Adjustments	(33.3)
Foreign currency translation/other	9.4
Ending Balance	5,231.5
Water Quality Systems [Member]
Goodwill [Roll Forward]
Beginning Balance	1,121.1
Goodwill, Purchase Accounting Adjustments	0.0
Foreign currency translation/other	3.3
Ending Balance	1,124.4
Flow & Filtration Solutions [Member]
Goodwill [Roll Forward]
Beginning Balance	882.7
Goodwill, Purchase Accounting Adjustments	0.0
Foreign currency translation/other	3.0
Ending Balance	885.7
Technical Solutions [Member]
Goodwill [Roll Forward]
Beginning Balance	2,255.2
Goodwill, Purchase Accounting Adjustments	(33.3)
Foreign currency translation/other	3.1
Ending Balance	2,225.0
Valves And Controls [Member]
Goodwill [Roll Forward]
Beginning Balance	996.4
Goodwill, Purchase Accounting Adjustments	0.0
Foreign currency translation/other	0.0
Ending Balance	$ 996.4