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Hedging Activities - Additional Information (Detail) - Foreign Exchange Contract - Designated as Hedging Instrument $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($)
Derivative [Line Items]
Percentage of effectiveness on net investment hedges	100.00%
Currency remeasuresment gains (losses)	$ (15.1)
British-Pound-Denominated Loans
Derivative [Line Items]
Hedge against net investment in foreign subsidiaries	290.7
Euro Loan
Derivative [Line Items]
Hedge against net investment in foreign subsidiaries	$ 670.8

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- Definition

Percentage of effectiveness on net investment hedges.

+ References

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- Definition

Amount of hedged item in hedging relationship. Excludes hedged asset or liability.

+ References

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- Definition

Amount before tax, after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580

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