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Derivatives - Summary of Gain (Losses) on Derivatives Designated as Cash Flow Hedging Instruments (Detail) - Cash Flow Hedging [Member] - Foreign Exchange Forward Contracts [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Net (loss) gain recognized in accumulated OCI	$ 3.0	$ (0.6)	$ 13.9	$ (7.7)
Net (loss) gain reclassified from accumulated OCI into income	$ (0.2)	$ 0.4	$ (2.1)	$ 2.2

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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