Fresh Start Accounting - Fair Value of Successor Common Shares (Details) - USD ($)	Sep. 30, 2023	Aug. 12, 2023	Aug. 11, 2023	Dec. 31, 2022
Reorganizations [Abstract]
Enterprise value			$ 2,150,000,000
Plus: Excess cash available for operations			206,100,000
Less: Fair value of Exit Facility	$ (1,260,600,000)		(1,250,000,000)
Less: Net pension, post-retirement and other benefits liability			(39,300,000)
Less: Other debt			(13,900,000)
Noncontrolling interests	$ (14,800,000)	$ (13,900,000)	(13,900,000)	$ (9,800,000)
Fair Value of Successor Equity			$ 1,039,000,000