Derivatives - Summary of Primary Net Hedging Positions and Corresponding Fair Values (Detail) - Foreign Exchange Forward Contracts [Member] - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	$ 176.2	$ 154.7
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	(6.5)	(0.2)
U.S. Dollar/Japanese Yen [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	61.5	45.9
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	(1.1)
U.S. Dollar/South Korean Won [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	62.2	51.7
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	(3.1)	0.2
U.S. Dollar/Euro [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	13.1	15.7
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	(0.6)	0.2
U.S. Dollar/U.K. Pound Sterling [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	6.1	8.3
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	(0.3)	(0.2)
U.S. Dollar/Taiwan Dollar [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	33.3	33.1
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	$ (1.4)	$ (0.4)