Investment in Other Affiliates (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2023	Dec. 31, 2022
Investments in and Advances to Affiliates, Schedule of Investments [Abstract]
Impairment	$ 7.7
Investments in nonmarketable securities of other companies		$ 71.9	$ 50.3