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Derivatives and Hedging Activity - Summary of Notional and Fair Values of Derivative Instruments (Parenthetical) (Detail) - Foreign Exchange Contracts [Member] - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Call Options [Member]    
Derivatives, Fair Value [Line Items]    
Foreign exchange derivative contracts $ 220.2 $ 342.0
Put Options [Member]    
Derivatives, Fair Value [Line Items]    
Foreign exchange derivative contracts 220.2 342.0
Forward Contracts [Member] | Call Options [Member]    
Derivatives, Fair Value [Line Items]    
Foreign exchange derivative contracts 66.7 43.8
Forward Contracts [Member] | Put Options [Member]    
Derivatives, Fair Value [Line Items]    
Foreign exchange derivative contracts $ 10.4 $ 12.1