Unconsolidated Affiliates - Schedule of Related Party Transactions and Balances Outstanding With Our Related Parties (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Related Party Transactions [Abstract]
Operating revenues from related parties		$ 60.5	$ 65.2	$ 71.7
Amounts paid to related parties	[1]	46.3	46.5	50.5
Distributions received from related parties		22.6	68.7	$ 30.1
Outstanding advances/loans to related parties		1.9	1.9
Trade accounts receivable from related parties		11.4	11.7
Total amounts receivable from related parties		13.3	13.6
Amounts payable to related parties		$ 2.7	$ 1.3

[1] Excludes amounts paid to our unconsolidated joint ventures related to loans, advancements and other capital investments.