Derivatives and Hedging Activities - Narrative (Detail) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Net gain (loss) to be reclassified during next 12 months	$ 28.2	$ 21.4
Designated as hedging instruments [Member] \| Cross-currency interest rate swap [Member]
Derivative [Line Items]
Derivative, notional amount	750.0
Not designated as hedging instruments [Member] \| Foreign currency forward contract [Member]
Derivative [Line Items]
Derivative, notional amount	1,817.2	1,500.4
Net investment hedges [Member] \| Designated as hedging instruments [Member]
Derivative [Line Items]
Derivative, notional amount	4,130.2	4,139.8
Cash flow hedges [Member] \| Foreign currency forward and option contracts [Member]
Derivative [Line Items]
Derivative, notional amount	$ 853.2	$ 760.9

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

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

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- Definition

The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994

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