Financial Instruments - Summary of Gains and Losses on Designated Hedging Derivatives Recognized in OCI (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2021
Other Comprehensive Income (Loss) \| Derivatives in Net Investment Hedging Relationships [Member] \| Foreign Exchange Contracts [Member]
Derivative Instruments Gain Loss [Line Items]
Gains (Losses) Recognized in OCI, Amount included in the assessment of effectiveness	$ 2.8	$ 2.8

Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration