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Business Segment, Geographic Area, and Significant Customer Information - Schedule of Capital Expenditures, Depreciation and Amortization Expense of Intangible Assets by Reportable Segment (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Capital expenditures:
Capital expenditures	$ 16.3	$ 20.9	$ 42.8	$ 30.9
Depreciation and amortization:
Depreciation and amortization	24.9	24.1	48.7	52.5
Vacuum & Analysis [Member]
Capital expenditures:
Capital expenditures	7.8	15.0	16.4	19.1
Depreciation and amortization:
Depreciation and amortization	6.4	5.1	12.2	10.0
Light & Motion [Member]
Capital expenditures:
Capital expenditures	5.1	4.5	16.7	8.5
Depreciation and amortization:
Depreciation and amortization	9.8	10.5	18.8	23.9
Equipment & Solutions [Member]
Capital expenditures:
Capital expenditures	3.4	1.4	9.7	3.3
Depreciation and amortization:
Depreciation and amortization	$ 8.7	$ 8.5	$ 17.7	$ 18.6

X

- Definition

The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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