Segment Information - Financial Information by Reportable Segment (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 28, 2015
Segment Reporting Information [Line Items]
Net sales	$ 1,575.5	$ 1,475.0
Segment Income (Loss)	209.8	199.3
Water Quality Systems [Member]
Segment Reporting Information [Line Items]
Net sales	331.5	306.9
Segment Income (Loss)	61.7	51.8
Flow & Filtration Solutions [Member]
Segment Reporting Information [Line Items]
Net sales	337.7	350.1
Segment Income (Loss)	39.5	36.4
Technical Solutions [Member]
Segment Reporting Information [Line Items]
Net sales	524.6	395.8
Segment Income (Loss)	112.8	77.6
Valves And Controls [Member]
Segment Reporting Information [Line Items]
Net sales	387.0	429.2
Segment Income (Loss)	25.3	55.4
Other
Segment Reporting Information [Line Items]
Net sales	(5.3)	(7.0)
Segment Income (Loss)	$ (29.5)	$ (21.9)