Marketable Securities - Schedule of Marketable Securities (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Schedule Of Available For Sale Securities [Line Items]
Market value, current	$ 99.0	$ 75.1
Market value, noncurrent	3.3	1.2
Non Current Assets
Schedule Of Available For Sale Securities [Line Items]
Market value, noncurrent	3.3	1.2
Cost or amortized cost	3.5	1.2
Unrealized loss, net	(0.2)
Current Assets
Schedule Of Available For Sale Securities [Line Items]
Market value, current	99.0	75.1
Cost or amortized cost	99.4	75.7
Unrealized loss, net	$ (0.4)	$ (0.6)