Revenue from Contracts with Customers - Summary of Revenue from Contracts with Customers (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Net revenues	$ 535.7	$ 463.6
Vacuum & Analysis [Member]
Disaggregation of Revenue [Line Items]
Net revenues	319.3	234.4
Light & Motion [Member]
Disaggregation of Revenue [Line Items]
Net revenues	165.4	194.0
Equipment & Solutions [Member]
Disaggregation of Revenue [Line Items]
Net revenues	51.0	35.2
Products [Member]
Disaggregation of Revenue [Line Items]
Net revenues	461.2	397.4
Products [Member] | Vacuum & Analysis [Member]
Disaggregation of Revenue [Line Items]
Net revenues	276.2	192.7
Products [Member] | Light & Motion [Member]
Disaggregation of Revenue [Line Items]
Net revenues	149.7	178.7
Products [Member] | Equipment & Solutions [Member]
Disaggregation of Revenue [Line Items]
Net revenues	35.3	26.0
Services [Member]
Disaggregation of Revenue [Line Items]
Net revenues	74.5	66.2
Services [Member] | Vacuum & Analysis [Member]
Disaggregation of Revenue [Line Items]
Net revenues	43.1	41.7
Services [Member] | Light & Motion [Member]
Disaggregation of Revenue [Line Items]
Net revenues	15.7	15.3
Services [Member] | Equipment & Solutions [Member]
Disaggregation of Revenue [Line Items]
Net revenues	$ 15.7	$ 9.2