Commitments and Contingencies - Changes in Asset Retirement Obligations (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Balance at beginning of year	$ 380.0	$ 306.8	$ 153.8
Accretion expense	10.9	10.6	7.2
Liabilities incurred and liabilities assumed in business combinations	33.8	78.6	179.0
Liabilities settled	(27.7)	(14.1)	(5.2)
Revisions in estimated cash flows	(12.5)	(3.1)	3.5
Liabilities reclassified from/(to) assets held for sale	15.8	1.2	(31.5)
Balance at end of year	$ 400.3	$ 380.0	$ 306.8