Derivative Instruments And Hedging Activities - Additional Information (Detail) - Designated as Hedging Instrument - Cross-currency swap € in Millions	Sep. 30, 2019 EUR (€)
Net Investment Hedging
Derivative [Line Items]
Notional Amount	€ 500.0
2021
Derivative [Line Items]
Notional Amount	687.7
2022
Derivative [Line Items]
Notional Amount	438.2
2023
Derivative [Line Items]
Notional Amount	441.9
2024
Derivative [Line Items]
Notional Amount	€ 442.6

Nominal or face amount used to calculate payment on derivative.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

Name:	us-gaap_DerivativeNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant