Exit Costs - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
North Louisiana
Restructuring Cost And Reserve [Line Items]
Accretion Expense			$ 31.6	$ 33.0
Exit and termination costs	$ 37.8	$ 24.8
Exit cost			389.9
Pennsylvania | Capacity Releases on Transportation Pipelines
Restructuring Cost And Reserve [Line Items]
Exit cost			$ 3.2