Business Segment, Geographic Area, Product/Service Offerings and Significant Customer Information - Reconciliation of Segment Gross Profit to Consolidated Net Income (Detail) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Gross profit	$ 262.0			$ 205.0			$ 747.9	$ 614.1
Research and development	42.5			41.7			127.7	122.3
Selling, general and administrative	87.0			82.1			260.3	247.8
Acquisition and integration costs	0.5			2.1			3.4	35.5
Restructuring and other	3.1			1.5			6.8	4.7
Amortization of intangible assets	12.5			17.0			42.6	50.3
Asset impairment							1.2
COVID-19 related net credits							(1.2)
Fees and expenses related to repricing of Term Loan Facility				0.6				6.5
Gain on sale of long-lived assets				(6.8)				(6.8)
Income from operations	116.4			66.8			307.1	153.8
Interest and other expense, net	7.6			11.4			24.6	31.2
Income before income taxes	108.8			55.4			282.5	122.6
Provision for income taxes	17.1			8.0			48.0	25.0
Net income	91.7	$ 73.7	$ 69.1	47.4	$ 37.7	$ 12.5	234.5	97.6
Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Gross profit	163.5			102.8			444.1	303.0
Light & Motion [Member]
Segment Reporting Information [Line Items]
Gross profit	76.0			79.9			227.8	257.6
Equipment & Solutions [Member]
Segment Reporting Information [Line Items]
Gross profit	$ 22.5			$ 22.3			$ 76.0	$ 53.5