Segment Information - Financial Information By Reportable Segment (Detail) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Net sales		$ 1,188.1	$ 1,210.7	$ 1,301.2	$ 1,190.0	$ 1,289.0	$ 1,112.8	$ 1,167.1	$ 1,047.5	$ 4,890.0	$ 4,616.4	$ 4,666.8
Segment income (loss)										839.5	755.2	705.2
Identifiable assets (1)		11,534.8				11,833.5				11,534.8	11,833.5	10,643.8
Depreciation										84.6	81.2	79.7
Amortization										96.4	68.1	60.6
Capital expenditures										117.8	91.3	83.7
Operating Income (Loss)		161.8	$ 182.8	$ 203.4	$ 152.7	171.7	$ 152.9	$ 170.8	$ 120.7	700.7	616.1	538.5
Water Quality Systems [Member]
Segment Reporting Information [Line Items]
Net sales										1,428.2	1,381.5	1,356.4
Segment income (loss)										313.3	281.8	253.3
Identifiable assets (1)	[1]	1,741.1				1,801.7				1,741.1	1,801.7	1,828.3
Depreciation										22.8	21.7	21.9
Capital expenditures										24.1	21.1	20.6
Flow & Filtration Solutions [Member]
Segment Reporting Information [Line Items]
Net sales										1,363.1	1,441.6	1,603.1
Segment income (loss)										180.7	187.2	201.3
Identifiable assets (1)	[1]	1,724.4				1,822.8				1,724.4	1,822.8	2,040.0
Depreciation										24.0	23.6	23.7
Capital expenditures										16.7	20.4	24.9
Technical Solutions
Segment Reporting Information [Line Items]
Net sales										2,116.0	1,809.3	1,728.1
Segment income (loss)										447.2	395.0	378.1
Identifiable assets (1)	[1]	4,419.3				4,488.4				4,419.3	4,488.4	2,117.3
Depreciation										31.6	27.6	24.2
Capital expenditures										74.5	47.4	24.0
All Other Segments
Segment Reporting Information [Line Items]
Net sales										(17.3)	(16.0)	(20.8)
Segment income (loss)										(101.7)	(108.8)	(127.5)
Identifiable assets (1)	[1]	$ 3,650.0				$ 3,720.6				3,650.0	3,720.6	4,658.2
Depreciation										6.2	8.3	9.9
Capital expenditures										$ 2.5	$ 2.4	$ 14.2

[1] All cash and cash equivalents and assets held for sale are included in "Other.