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Revenue from Contracts with Customers - Summary of Revenue from Contracts with Customers (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Net revenues	$ 544.3	$ 474.1	$ 1,080.0	$ 937.7
Vacuum & Analysis [Member]
Disaggregation of Revenue [Line Items]
Net revenues	314.5	235.7	633.8	470.0
Light & Motion [Member]
Disaggregation of Revenue [Line Items]
Net revenues	166.0	182.5	331.4	376.6
Equipment & Solutions [Member]
Disaggregation of Revenue [Line Items]
Net revenues	63.8	55.9	114.8	91.1
Products [Member]
Disaggregation of Revenue [Line Items]
Net revenues	473.0	401.3	934.2	798.7
Products [Member] | Vacuum & Analysis [Member]
Disaggregation of Revenue [Line Items]
Net revenues	273.4	191.8	549.6	384.4
Products [Member] | Light & Motion [Member]
Disaggregation of Revenue [Line Items]
Net revenues	150.7	167.3	300.4	346.1
Products [Member] | Equipment & Solutions [Member]
Disaggregation of Revenue [Line Items]
Net revenues	48.9	42.2	84.2	68.2
Services [Member]
Disaggregation of Revenue [Line Items]
Net revenues	71.3	72.8	145.8	139.0
Services [Member] | Vacuum & Analysis [Member]
Disaggregation of Revenue [Line Items]
Net revenues	41.1	43.9	84.2	85.6
Services [Member] | Light & Motion [Member]
Disaggregation of Revenue [Line Items]
Net revenues	15.3	15.2	31.0	30.5
Services [Member] | Equipment & Solutions [Member]
Disaggregation of Revenue [Line Items]
Net revenues	$ 14.9	$ 13.7	$ 30.6	$ 22.9

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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