Financial Instruments - Summary of Available-for-Sale Short-Term Investments (Detail) - Short-term Investments - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 10.5	$ 123.3
Aggregate Fair Value	10.5	123.3
Foreign Certificates of Deposit and Time Deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	10.5	11.3
Aggregate Fair Value	$ 10.5	11.3
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		112.0
Aggregate Fair Value		$ 112.0