Commitments and Contingencies - Changes in Asset Retirement Obligations (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Balance at beginning of year	$ 306.8	$ 153.8	$ 143.9
Accretion expense	10.6	7.2	5.9
Liabilities incurred and liabilities assumed in business combinations	78.6	179.0	0.3
Liabilities settled	(14.1)	(5.2)	(10.3)
Revisions in estimated cash flows	(3.1)	3.5	14.0
Liabilities reclassified from/(to) assets held for sale	1.2	(31.5)
Balance at end of year	$ 380.0	$ 306.8	$ 153.8