Revenue from Contracts with Customers - Summary of Revenue from Contracts with Customers (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Net revenues	$ 589.8	$ 462.5	$ 1,669.8	$ 1,400.1
Vacuum & Analysis [Member]
Disaggregation of Revenue [Line Items]
Net revenues	361.3	240.7	995.1	710.7
Light & Motion [Member]
Disaggregation of Revenue [Line Items]
Net revenues	175.9	172.4	507.3	549.0
Equipment & Solutions [Member]
Disaggregation of Revenue [Line Items]
Net revenues	52.6	49.4	167.4	140.4
Products [Member]
Disaggregation of Revenue [Line Items]
Net revenues	506.8	386.2	1,441.0	1,184.9
Products [Member] | Vacuum & Analysis [Member]
Disaggregation of Revenue [Line Items]
Net revenues	313.9	197.2	863.5	581.6
Products [Member] | Light & Motion [Member]
Disaggregation of Revenue [Line Items]
Net revenues	156.9	156.4	457.3	502.5
Products [Member] | Equipment & Solutions [Member]
Disaggregation of Revenue [Line Items]
Net revenues	36.0	32.6	120.2	100.8
Services [Member]
Disaggregation of Revenue [Line Items]
Net revenues	83.0	76.3	228.8	215.2
Services [Member] | Vacuum & Analysis [Member]
Disaggregation of Revenue [Line Items]
Net revenues	47.4	43.5	131.6	129.1
Services [Member] | Light & Motion [Member]
Disaggregation of Revenue [Line Items]
Net revenues	19.0	16.0	50.0	46.5
Services [Member] | Equipment & Solutions [Member]
Disaggregation of Revenue [Line Items]
Net revenues	$ 16.6	$ 16.8	$ 47.2	$ 39.6