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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
Dec. 31, 2019
Dec. 31, 2018
Call Options [Member]    
Derivatives, Fair Value [Line Items]    
Foreign exchange derivative contracts $ 342.0 $ 276.4
Put Options [Member]    
Derivatives, Fair Value [Line Items]    
Foreign exchange derivative contracts 342.0 276.4
Forward Contracts [Member]    
Derivatives, Fair Value [Line Items]    
Foreign exchange derivative contracts 12.1 23.1
Forward Contracts [Member] | Call Options [Member]    
Derivatives, Fair Value [Line Items]    
Foreign exchange derivative contracts $ 43.8 $ 72.9