Goodwill and Other Identifiable Intangible Assets - Changes in Carrying Amount of Goodwill by Segment (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)
Goodwill [Roll Forward]
Beginning Balance	$ 5,255.4
Goodwill, Purchase Accounting Adjustments	(24.5)
Foreign currency translation/other	19.1
Ending Balance	5,250.0
Water Quality Systems [Member]
Goodwill [Roll Forward]
Beginning Balance	1,121.1
Goodwill, Purchase Accounting Adjustments	0.0
Foreign currency translation/other	3.5
Ending Balance	1,124.6
Flow & Filtration Solutions [Member]
Goodwill [Roll Forward]
Beginning Balance	882.7
Goodwill, Purchase Accounting Adjustments	0.0
Foreign currency translation/other	12.1
Ending Balance	894.8
Technical Solutions [Member]
Goodwill [Roll Forward]
Beginning Balance	2,255.2
Goodwill, Purchase Accounting Adjustments	(24.5)
Foreign currency translation/other	3.5
Ending Balance	2,234.2
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