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Hedging Activities - Additional Information (Detail) - Foreign Exchange Contract - Designated as Hedging Instrument - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Derivative [Line Items] |  |
Percentage of effectiveness on net investment hedges | 100.00% |
Currency remeasurement gains (losses) | $ 60.5 | $ 2.4
British-Pound-Denominated Loans |  |
Derivative [Line Items] |  |
Hedge against net investment in foreign subsidiaries | 307.3 | 404.7
Euro Loan |  |
Derivative [Line Items] |  |
Hedge against net investment in foreign subsidiaries | $ 699.7 | $ 645.6

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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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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