Business Segments - Schedule of Information on Company's Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net sales	$ 573,366	$ 549,696	$ 1,126,918	$ 1,052,268
Operating income	125,133	113,823	240,804	217,168
Interest expense	11,304	11,205	22,856	21,694
Other (income) expense - net	372	(1,027)	64	(983)
Income before income taxes	113,457	103,645	217,884	196,457
Total assets	3,224,165		3,224,165		$ 3,154,944
Benefit from reversal of contingent consideration		1,000		4,700
Intersegment elimination
Segment Reporting Information [Line Items]
Net sales	(208)	(293)	(552)	(525)
Corporate office expense and other
Segment Reporting Information [Line Items]
Operating income	(18,387)	(15,877)	(35,393)	(30,571)
Total assets	129,572		129,572		117,503
Fluid & Metering Technologies
Segment Reporting Information [Line Items]
Net sales	221,123	221,635	437,778	433,344
Operating income	60,029	54,172	117,842	105,875
Fluid & Metering Technologies | Intersegment elimination
Segment Reporting Information [Line Items]
Net sales	59	175	174	309
Fluid & Metering Technologies | Operating Segments
Segment Reporting Information [Line Items]
Net sales	221,182	221,810	437,952	433,653
Total assets	1,092,811		1,092,811		1,065,670
Health & Science Technologies
Segment Reporting Information [Line Items]
Net sales	204,297	186,453	403,872	372,704
Operating income	46,294	41,108	88,532	81,790
Health & Science Technologies | Intersegment elimination
Segment Reporting Information [Line Items]
Net sales	112	115	216	207
Health & Science Technologies | Operating Segments
Segment Reporting Information [Line Items]
Net sales	204,409	186,568	404,088	372,911
Total assets	1,274,359		1,274,359		1,266,036
Fire & Safety/Diversified Products
Segment Reporting Information [Line Items]
Net sales	147,946	141,608	285,268	246,220
Operating income	37,197	34,420	69,823	60,074
Fire & Safety/Diversified Products | Intersegment elimination
Segment Reporting Information [Line Items]
Net sales	37	3	162	9
Fire & Safety/Diversified Products | Operating Segments
Segment Reporting Information [Line Items]
Net sales	147,983	$ 141,611	285,430	$ 246,229
Total assets	$ 727,423		$ 727,423		$ 705,735