Unconsolidated Affiliates - Schedule of Related Party Transactions and Balances Outstanding With Our Related Parties (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Related Party Transactions [Abstract]
Operating revenues from related parties		$ 59.2	$ 60.5	$ 65.2
Amounts paid to related parties	[1]	48.4	46.3	46.5
Distributions received from related parties		38.4	20.9	$ 68.5
Outstanding advances/loans to related parties		1.9	1.9
Trade accounts receivable from related parties		10.0	11.4
Total amounts receivable from related parties		11.9	13.3
Amounts payable to related parties		$ 2.5	$ 2.7

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